Environmental Monitoring Report Quarterly Report January–March 2017

Sri Lanka: Green Power Development and Energy

Efficiency Improvement Investment Program

(Tranche 1)-Moragolla Hydropower Project

Prepared by Ceylon Electricity Board of the Ministry of Power and Renewable Energy for the

Asian Development Bank

This environmental monitoring report is a document of the borrower. The views expressed herein do not necessarily represent those of ADB's Board of Directors, Management, or staff, and may be preliminary in nature. In preparing any country program or strategy, financing any project, or by making any designation of or reference to a particular territory or geographic area in this document, the Asian Development Bank does not intend to make any judgments as to the legal or other status of any territory or area.

Environmental Safeguard Monitoring Report

Reporting Period : January 2017 to March 2017

Date : April 03, 2017

Loan No. : 3147 / 3146 (SF) - SRI

SRI: Green Power Development and Energy Efficiency

Improvement Investment Program (Tranche-01)

Moragolla Hydropower Project

Prepared by Ceylon Electricity Board of the Ministry of Power and Renewable Energy for the Asian

Development Bank

This environmental safeguard monitoring report is a document of the borrower and made publicly

a aila le i a orda e ith ADB’s Pu li Co u i atio s Poli y a d the “afeguard poli y “tate e t 2009.The views expressed herein do not necessarily represent those of ADB’s Board of Dire tors,

Management, or staff.

1

TABLE OF CONTENTS

Page

Abbreviations 02

Executive Summary 03

1.0 Introduction 04

1.1. Brief Project Description 04

1.2. Project Progress Status and Implementation Schedule 05

2.0 Compliance to National Regulations 09

3.0 Compliance to Environmental Covenants from the ADB Loan Agreement 11

4.0 Compliance to Environmental Management Plan 13

5.0 Safeguards Monitoring Results and Unanticipated Impacts 15

6.0 Implementation of Grievance Redress Mechanism and Complaints Received from

Stakeholders 17

7.0 Supplementary Environment Impact Assessment Report 18

8.0 Fish Surveying, Translocation and Monitoring of the Labeo fisheri along the

Mahaweli River 19

9.0 River Flow Data on the Mahaweli River Downstream of the Moragolla Hydropower

Plant 21

10.0 Conclusions and Recommendations 21

Annexure 1 - River Flow Data on the Mahaweli River Downstream of the Moragolla Hydropower

Plant 23

Annexure 2 - Letter received from Mr. Prashan De Silva 36

LIST OF TABLES

1.1 Summary of Environmental Compliance Status 03

2.1 Status of the Main Activities of the Project funded by ADB 05

2.2 Status of the Preliminary Activities of the Project funded by CEB 06

3.1 Activities related to Aquatic Ecology 07

3.2 Activities related to Terrestrial Ecology 08

4.1 Applicable Acts and Legislation to the project 09

5.1 Environmental Covenants 11

6.1 Compliance Status on Pre-Construction Environmental Issues in Moragolla Hydropower

Project 14

7.1 Environmental Monitoring Plan for the Moragolla Hydropower Project: Special Issues 16

8.1 Key activities of the SEIA approval process 18

9.1 Key activities of the Fish Surveying, Translocation and Monitoring of the Labeo fisheri 20

2

ABBREVIATIONS

ADB Asian Development Bank

APs Affected Persons

CEB

Ceylon Electricity Board

CEA Central Environmental Authority

GoSL Government of Sri Lanka

GRC Grievance Redress Committee

DS Divisional Secretariat

DWC Department of Wild Life Conservation

EARF Environmental Assessment and Review Framework

EIA Environmental Impact Assessment

EMP Environmental Management Plan

EMoP Environmental Monitoring Plan

EPL Environmental Protection License

FSL Full Supply Level

FD Forest Department

IA Implementing Agency

IUCN International Union for Conservation of Nature

IEE Initial Environmental Examination

LAA Land Acquisition Act

NEA National Environment Act

NZG National Zoological Gardens

MASL Mahaweli Authority of Sri Lanka

MCM Million Cubic Meter

MFF Multi Financing Facility

MHP Moragolla Hydropower Project

MoPE Ministry of Power and Renewable Energy

MV Medium Voltage

MPC

Ministry Procurement Committee NBRO

PD Project Director

PMO Project Management Office

PMU Project Management Unit

PPC Project Procurement Committee

Rsp Responsibility

SCAPC Standard Cabinet Appointed Procurement Committee

SPS Safeguard Policy Statement

TL Transmission Line

Electrical Terminology V Volt Unit of Voltage

kV Kilovolt 1000 volts

W Watt Unit of active power

kW Kilowatt 1000 watts

MW Megawatt 1000kW

MWh Megawatt hour Unit of energy

VA Volt ampere Unit of apparent power

MVA Million volt ampere 106VA

3

Executive Summary

Moragolla Hydropower Project (MHP) is one of several hydropower projects identified by the

Government of Sri Lanka (GoSL) to reduce the role of fossil-fuel power generation, which has outstripped

hydropower over the past 30 years as readily exploitable locations have been utilized. The Executing

Agency of The project is the Ministry of Power and Renewable Energy (MoPE) and the Implementing

Agency is the Ceylon Electricity Board (CEB). Financial assistance is given by the Asian Development Bank

(ADB) under the Tranch 1 of Green Power Development and Energy Efficiency Improvement Investment

Program.

The Project involves construction of a 37m high, 236 m long concrete gravity dam (crest at 550 masl), to

create a 38.5ha, 1.98 MCM reservoir with a Full Supply Level (FSL) at 548 masl. The concrete spillway

contains 5 radial gates (13x15m) designed to pass a 10,000 year flood (6,700m3/s) with no increase in

FSL, or with a 2m increase if one gate was non-operational and closed. Water will be diverted by an intake

just upstream of the dam, into a 2.7km, 4.7m ø underground headrace tunnel, surge tank and penstock

on the left bank, to an above-ground powerhouse and 28m open-channel tailrace outfall, through which

water will return to the river. Existing 132 kVA transmission line (TL) from Polpitiya to Kiribathkumbura

will have an in and out connection to the Moragolla 132kV switchyard.

The Environmental Management Plan (EMP) and Environmental Monitoring Plan (EMoP) are the main

practical tools employed during the project implementation to provide the environmental protection

measures. The purpose of the Environmental Management Plan (EMP) is to set out clearly the required

mitigation measures and allocate responsibility for each, and to provide additional information to assist in

planning and implementing the various activities.

The impacts and mitigation for this project fall into four distinct categories, based on the phase in which

the mitigation will be provided and the parties who will take the necessary action. For this reason the

EMP as well as EMoP for this project is subdivided into the equivalent four parts. These are as follows:

a) Construction Phase EMP;

b) Operation Phase EMP;

c) Special Issues EMP: Aquatic Ecology;

d) Special Issues EMP: Terrestrial Ecology.

Since at the moment project is at preconstruction stage, this report mainly addressed relevant

environmental issues and their mitigation measures for preconstruction stage of the project as mentioned

in the following table and forth coming chapters.

Summary of Environmental compliance during the period of January 01, 2017 to March 31, 2017.

Table No. 1.1 : Summary of Environmental Compliance Status

Environmental Mitigation Measures Compliance Status

Preventing Poaching To be commenced

Confirmation of Fish Distributions (Fish Survey) Commenced

Catch- and- Haul (Fish Translocation) To be commenced

Animal Rescue Program To be commenced

Afforestation/Habitat Enhancement To be commenced

4

1.0 Introduction:

1.1 Brief Project Description

Green Power Development and Energy Efficiency Improvement Investment Program is intended to finance

a series of investments via Multi-tranche Financing Facility (MFF) of Asian Development Bank (ADB).

Tranche-01 consists of several development projects in generation, transmission and distribution sectors,

including Moragolla Hydropower Project.

Moragolla Hydropower Project (MHP) is one of several hydropower projects identified by the Government

of Sri Lanka (GoSL) to reduce the role of fossil-fueled power generation, which has outstripped

hydropower over the past 30 years as readily exploitable locations have been utilized. Returning

hydropower to greater prominence would promote sustainable development and reduce greenhouse gas

emissions in line with the National Climate Change Policy, and limit exposure to fluctuating international

fuel prices. The Executing Agency is the Ministry of Power and Renewable Energy (MoPE) and the

Implementing Agency is the Ceylon Electricity Board (CEB).

The project will be located in the upper reaches of the Mahaweli Ganga in the Central Highlands of Sri

Lanka, approximately 22 km south of Kandy City and 130 km north-east of Colombo.

The project involves construction of a 37 m high, 236 m long concrete gravity dam (crest at 550 masl), to

create a 38.5 ha, 1.98 MCM reservoir with a Full Supply Level (FSL) at 548 masl. The concrete spillway

contains 5 radial gates (13 x 15 m) designed to pass a 10,000 year flood (6,700 m3/s) with no increase in

FSL, or with a 2 m increase if one gate was non-operational and closed. Water will be diverted by an intake

just upstream of the dam, into a 2.7 km , 4.7 m Ø underground headrace tunnel, surge tank and penstock

on the left bank, to an above-ground powerhouse and 28 m open-channel tailrace outfall, through which

water will return to the river. Existing 132 kVA transmission line (TL) from Polpitiya to Kiribathkumbura will

have an in and out connection to the Moragolla 132kV switchyard.

MHP is designed as a run-of-river scheme, with an installed capacity of 30.2 MW (2 x 15.1 MW); and it will

operate as a peaki g statio , ge erati g po er i the daily peak de a d period (5-9 pm), and at other

times if there is sufficient water (mainly in the monsoon season). The dam includes a pipe to discharge a

o sta t E iro e tal Flo (E-flow) of 1.5 m3/s, which will pass through a micro-hydro plant on the

right bank, generating an additional 360 kW.

5

1.2 Project Progress Status and Implementation Schedule:

A. Progress Status

The updated status of Moragolla Hydropower Project from January 2017 to March 2017 is given below

in Table 2.1 and Table 2.2 respectively.

Table -2.1: Status of the Main Activities of the Project funded by ADB

Se. No Work Description Status

1.0 Lot 1 - Civil Works

Part A – Preparatory Works consists of construction of Base

camp for the Employer and Engineer, upgrading and

construction of irrigation facilities, and construction and

improvement of permanent access roads.

Part B – Main work consists of construction of a dam, intake,

headrace tunnel, surge tank, penstock shaft, power house,

tailrace, and switchyard and all related works.

ADB has approved the Lot 1

(Civil Works) bidding

document and SCAPC has

approved the same on May

21, 2015. Bid calling was

delayed due to non-

appointment of the

Consultant who should

review the bidding

document before calling for

bids. Consultant has

completed the review of Lot

1 bidding document without

the Dam section, since MASL

has requested to

incorporate a Bottom outlet

and to widen Dam Crest by

3m for an additional

carriage way.

2.0 Lot 2 – Mechanical and Electrical Facilities

Part A – Hydro Mechanical Facilities consists of dam gates, stop

logs, trash racks, steel lining of penstock and all hydro

mechanical facilities.

Part B – Electro Mechanical Facilities consist of turbine,

generators, switchyard equipment, control and protection

systems, connection to the existing transmission line, micro

hydro power plant and all other electro mechanical facilities.

Lot 2 CEB Consultants have

commenced scrutinizing the

bidding document with the

PMU and expect to

complete by May 31, 2017.

3.0 Lot 3- Consultancy Service

Consultancy Supervision Services for the project.

After Cabinet approval and

ADB concurrence the

contract for the Consultancy

Services was signed

between CEB and Ms.

Nippon Koei Co. Ltd. (Japan)

in joint venture with

Fitchner GmbH & Co. KG

(Germany) on October 24,

2016. Consultant has

completed the review of Lot

1 bidding document on

March 31, 2017, without the

dam section.

6

Table -2.2: Status of the Preliminary Activities of the Project funded by CEB

Se. No Work Description Status

1 Land Acquisition

Udapaltha DS Division - Under Section 9, title inquiries were

completed for all lands under Uda Palatha DS Division. Section 10

decision on title notice was sent to Valuation Department for

valuation for the lands which has clear title. For other lands DS

(Udapalatha) has requested clarification from Ministry of Lands for

the issues aroused in title inquiry.

Ganga Ihala Korale DS division – Under Section 9, title inquiries

were completed for all lands under Ganga Ihala Korale DS Division,

except for Ulapane South. After title inquiries errors on some PPs

were complained by PAPs. Site investigations on those issues were

completed and PPs to be corrected. Survey request for PP

correction was sent to Survey Superintendent-Kandy by DS (Ganga

Ihala Korale).

Section-38 Direction was received for Ulapane South in Ganga lhala

Korale DS Division. Section 5 Direction was received and Survey

order was given to prepare PP. Plan preparation work was

completed and PP is pending.

2 Resettlement Land Possession of the resettlement land was taken over by CEB after

Section 38 - direction. Section 9 title inquiries were completed and

Section 10 decision on title notice is pending.

3 Construction of

Resettlement Village

Contract was awarded to Ms. Sierra Construction Co. Ltd. on March

21, 2016. Preliminary design work is ongoing. But physical

construction work is delayed until approval for the Supplementary

EIA is received.

4 Environmental

activities

Contract was awarded to Ms. Access Energy (Pvt) Ltd. to obtain the

river flow measurement along the Mahaweli river. Flow

measurements work were commenced and ongoing.

Contract was awarded to Ms. National Aquatic Resources Research

& Development Agency to carry out a fish survey along Mahaweli

River. A Technical Committee was appointed to oversee the

implementation of fish survey and translocation process. A request

letter was sent to Director General of Wild Life Dept. for approval

to commence the work. After approvals from Department of

Wildlife NARA has completed the fish surveying work. It was

observed that Labeo fisheri was present in the vicinity of the project

area and awaiting for their report.

7

B. Implementation Schedule for Environmental Activities of Moragolla Hydropower Project

B.1 Aquatic Ecology

Table No. 3.1: Activities related to Aquatic Ecology

Note 1: Pre construction activities was delayed due to delay in appointing the Consultancy Service to commence work.

Activities 2016 2017 2018 2019 2020 2021 2022 2023

Pre-construction Construction Operation

Preventing Poaching

Worker dissemination sessions. X1 X X

Monitoring (spot checks) of worksites adjacent to the river.

X X X X X X X X X

Confirmation of Fish Distributions (Fish Survey)

Logistics preparation for survey

(equipment procurement; maps,

boat).

X

Fish survey. X X

Linkage to fish translocation

program.

X

Fish Survey / Monitoring X X X X X X X X X X X X

Catch- and- Haul (Fish Translocation)

Review of fish survey data. X

Survey and selection of

translocation sites.

X

Undertake catch-and-haul. X

Public awareness-raising at target

sites to support fish conservation.

X X X

8

B.2 Terrestrial Ecology

Table No. 3.2: Activities related to Terrestrial Ecology

Activities 2016 2017 2018 2019 2020 2021 2022 2023

Pre-construction Construction Operation

Afforestation/Habitat Enhancement

Final selection of afforestation sites.

X2

Survey and demarcation of planting sites.

X2

Final site-specific selection of species.

X2

Preparation of detailed afforestation plan.

x

Preparation of detailed planting maps.

x

Establishment and maintenance of nurseries.

x x

Land preparation for planting. x

Supply of planting material. x

Afforestation planting. x

Post-planting maintenance and management.

x x x x x

Weeding. x x

Fire protection. x x x

Application of fertilizer. x x

Cutting of climbers and creepers.

x x x

Pest and diseases control. x x x x x x

Vacancy planting. x

Monitoring. x x x x x x x x x

Animal Rescue Program

Animal rescue program. X2 X X

Note 2: Pre construction activities are delayed due to delay in some local approvals and approval for Supplementary EIA.

9

2.0 Compliance to National Regulations:

The relevant applicable Acts and Legislations to the project are given in the Table No. 4.1.

Table No. 4.1: Applicable Acts and Legislations to the project

Act /Rule/Notification Year Objectives Compliance Status

National Environment Act (NEA) No

47 of 1980 as amended by act No

56 of 1988 and act No 53 of 2000

1980

1988

2000

Sri Lanka national basic

charter for protection and

management of environment.

Being Complied

EIA regulations gazetted under NEA

(Government Gazette Extraordinary

No.772/72 dated 24 June 1993 and

in several subsequent

amendments)

1993 Schedule of State agencies as

the project approving

agencies under NEA.

Mahaweli Authority

of Sri Lanka is the

Project Approving

Authority for the

Moragolla

Hydropower Project

Environmental Protection License

(EPL) regulations gazetted under

NEA (Government Gazette

Extraordinary No. 1533/16 dated 25

January 2008)

2008 Schedule of activities for

which a EPL is required under

NEA

To be obtained at

construction stage

Wastewater Discharge Standards-

Gazette Notification No. 1534/18

dated 01/02/2008

2008 General standards and

criteria for the discharge of

industrial effluents into inland

surface waters

To be incorporated

at Construction stage

National Environmental (Noise

Control) Regulations 1996 -

Gazette Notification no. 924/12

dated 23.05.1996

1996 To regulate and control noise

generating sources with the

objective of maintaining the

standards (Under NEA)

Base line study will

be done once the

contract is awarded

with the

participation of the

contractor, before

commencement of

work.

Sri Lanka Electricity Act, No. 20 of

2009

2009 The Act does not explicitly

deal with environmental

implications of activities

related to power generation,

transmission and distribution.

However, CEB

Integrates environment

protection as a part of its

project activities.

Being Complied to

CEB standards.

Mines and Minerals Act No. 33 of

1992

1992 Provide for the establishment

of the Geological survey and

mines Bureau to regulate the

exploration for mining,

transportation, processing,

trading in or export of

minerals.

Necessary approvals

will be taken at pre-

construction stage.

10

Act /Rule/Notification Year Objectives Compliance Status

Mahaweli Authority of Sri Lanka Act

No. 23 of 1979

1979 To plan and implement the

Mahaweli Ganga

Development Scheme

including the construction

and operation of reservoirs,

irrigation distribution system

and installations for the

generation and supply of

electrical energy.

Being Complied

Soil Conservation Act No. 25 of

1951 and No. 29 of 1953 and

amended by Act No. 24 of 1996

1951

1953

1996

To make provision for the

enhancement and substance

of productive capacity of the

Soil; to restore degraded land

for the prevention and

mitigation of soil erosion; for

the Conservation of soil

resources and protection of

land against damage by

floods, salinity, alkalinity

water clogging, and to

provide for matters

connected therewith or

incidental thereto.

To be incorporated

at Construction stage

Irrigation Ordinance No. 32 of 1946,

Act No.1 of 1951 and No. 48 of

1968, Law No. 37 of 1973

1946

1951

1968

1973

Construction and

Maintenance of Irrigation

Works, Protection of

Irrigation Works and

Conservation of Water

To be incorporated

at Construction stage

Fauna and Flora Protection

Ordinance as amended by Act No.

49 of 1993 and subsequent

amends.

1993 To provide for the protection,

conservation and

preservation of the fauna and

flora of Sri Lanka

Being Complied

The Antiquities Ordinance, No.9 of

1940 (now Act) and the subsequent

amendments, particularly the

Antiquities (Amendment) Act No.

24 of 1998 is the primary Act.

1940

1998

This Ordinance provides for

the preservation of the

antiquities of Sri Lanka

At present project

area does ’t i ol e

with any antiquities.

The Urban Development Authority

Act No. 41 of 1978

1948 Minister in-charge of the

subject of Urban

Development declares the

areas suitable for

development.

Being Complied

11

3.0 Compliance to Environmental Covenants from the ADB Loan Agreement:

The Table 5.1 shows the applicable Environmental Covenants from the ADB Loan Agreement.

Table No.5.1: Environmental Covenants

Product Schedule Para

No.

Description Remarks

Loan

3146-SRI

5 5 The Borrower and CEB shall ensure that

the preparation, design, construction,

implementation, operation and

decommissioning of the project and all

project facilities comply with (a) all

applicable laws and regulations of the

Borrower relating to environment,

health, and safety; (b) the

Environmental safeguards; (c) the EARF;

and (d) all measures and requirements

set forth in a respective IEE or EIA and

EMP, and any corrective or preventive

actions set forth in a Safeguards

Monitoring Report.

It is being complied as per ADB

Safeguard Policy Statement (SPS) (2009)

as set out in the EARF.

EMP is being implemented in

accordance with applicable laws and

regulations of GOSL and ADB guide

lines.

Further an Environmental Management

Office of the MHP will carry out the

regular environmental monitoring as set

out in the EMP.

The Environmental Monitoring actions

has been planned and will be carried

out in all three phases of

preconstruction, during construction,

and post construction phase.

Loan

3146-SRI

5 6 By 2015, CEB shall undertake, to the

satisfaction of ADB, (a) dry and wet

season fisheries surveys for the

endangered Green Labeo fish on the

stretch of Mahaweli River from around

the site of the Moragolla Hydropower

plant tailrace and the confluence with

the Atabage Oya to appropriate point

downstream on the Mahaweli river and

(b) collect hourly, daily and monthly

flow data on the Mahaweli river

downstream of the Moragolla

Hydropower Plant tailrace and the

confluence with the Atabage Oya over

the period of January 2015 to

December to Identify the minimum

required downstream environmental

river flows during the dry and wet

seasons to satisfy the critical habitat

requirements of the safeguard Policy

Statement. CEB shall ensure that such

minimum required downstream

environmental river flows are

maintained following completion of the

Moragolla Hydropower plant to avoid

any measurable adverse impacts on the

habitat of the endangered Green Labeo

fish.

Being complied.

Contract was awarded to Ms. National

Aquatic Resources Research &

Development Agency (NARA) to

commence fish survey and translocation

of Labeo fisheri along Mahaweli River.

A Technical Committee was appointed

to oversee the implementation of fish

survey and translocation process.

Meetings were held with Department of

Wild Life on April 2016. Approval was

received and NARA has commenced the

fish surveying work. Surveying was

carried out for 04 days and temporarily

suspended due to turbid water. NARA

has requested for permission from

Dept. of Wildlife (DWC) to use different

trapping system due to fast flowing rate

and less transparency.

After approvals received for the same

from the DWC, NARA has completed

the fish surveying work. It was observed

that the Labeo fisheri was present in

the vicinity of the project area and

awaiting for their report.

12

Product Schedule Para

No.

Description Remarks

Contract was awarded to Ms. Access

Energy (Pvt) Ltd to obtain river flow

measurements along Mahaweli River.

Mahaweli Authority approval was

received for a location to carry out the

flow measurements. Flow

measurements were commenced and

ongoing.

Loan

3146-SRI

5 7 CEB shall enter into an agreement with

Mahaweli Authority, acceptable to

ADB, which shall, inter alia, set out(a)

to the extent possible, the minimum

hourly, daily and monthly

environmental river flows downstream

of the Moragolla Hydropower Plant

tailrace during the dry and wet seasons;

and (b) a regulatory mechanism for the

coordinated operation of the Moragolla

Hydropower Plant following its

construction and the existing Kotmale

hydropower plant to ensure that, at all

times, adequate downstream flows are

released to avoid any measurable

adverse impacts on the Labeo fisheri

and maintain the population of the

endangered Green Labeo fish inhabiting

the Mahaweli River downstream of the

tail race of the proposed Moragolla

Hydropower Plant and the confluence

of the Atabage Oya with the Mahaweli

River.

To be carried out

A project modification report was

submitted to the project approving

authority for approvals due to some

changes in EIA. A Supplementary

Environmental Impact Assessment

report is prepared and submitted for

approvals. Once this is approved the

agreement between CEB and Mahaweli

Authority is expected to be reached.

Loan

3146-SRI

5 8 Within 180 days of the effective date

CEB shall established an Environment

Management office, acceptable to ADB,

which shall be responsible for (a) the

environmental monitoring of

construction activities of the Moragolla

Hydropower plant; and (b)

implementation of the relevant EMP for

the Moragolla Hydropower plant

including monitoring of the Labeo fisheri

and downstream minimum

environmental river flows during

operations of the Moragolla

Hydropower plant.

Complied.

Environment Management Office was

established in June 2015 with one

Engineer and Supervisor to take care

the Resettlement, Environmental and

Social issues. Environmental Officer is

also recruited to oversee the

environmental issues.

13

4.0 Compliance to Environmental Management Plan:

The Environmental impacts and mitigation for this project fall into four distinct categories, based on the

phase in which the mitigation will be provided and the parties who will take the necessary action. For this

reason the EMP for this project has subdivided into the equivalent four parts. These are as follows:

1. Construction Phase EMP

2. Operation Phase EMP

3. Special Issues EMP: Aquatic Ecology

4. Special Issues EMP: Terrestrial Ecology

Following the Feasibility study (2009-2012), EIA approval was received from MASL (Project Approving

Agency) in August 2013. Subsequently, Detailed Engineering Design was conducted by the Consultant

with ample amount of studies and investigations. Consequently, certain features of the proposed projects

were substantially altered to optimize the project implementation with respect to environmental, social

and economic perspectives. Thus, the major two entities in this regard are;

1. Shifting the dam 100m downstream from the original location of feasibility study followed by

shortening of tunnel etc.

2. Recording of existence of "Labeo Fisheri" in the project affected area as per the additional

environmental studies of Detailed design phase.

Considering all these changes and environmental implications identified in the detailed design phase

Environmental Submission to ADB was made in 2014 including the Environmental Management Plan and

approval from ADB was received.

At the meantime, due to design changes in the Detailed Engineering Design, MASL (Mahaweli Authority

of Sri Lanka) as the Project Approving Agency claimed for a supplementary EIA. Moreover, they have

recommended for inclusion of bottom outlet which was again a substantial design change. Thus, Volume

2: Environmental Management Plan of 2014 has to be revised again.

First review of the EMP has been completed by the Consultants and the PMU and necessary changes to

the EMP was identified. Based on the survey results of the endangered Labeo fisheri conducted by NARA

and on the recommendations of the Department of Wild life, necessary changes will be done to the EMP.

In addition, the conditions given when providing the approval for Supplementary EIA by the Project

Approving Authority, will be included to the EMP. Final review of the EMP will be done based on the

above recommendations and this will be submitted for necessary approvals and concurrence.

Since this project is in pre-construction stage, special issues of EMP; Aquatic Ecology and Terrestrial

Ecology and relevant environmental issues and their mitigation measures for pre-construction stage of

the Project are being carried out and addressed in this report.

Based on the present Environmental Management Plan the Compliance Status on Environmental Issues

in Moragolla Hydropower Project for pre-construction stage is presented in Table No.6.1. It is to be

noted that since no physical construction work has yet being commenced, only some activities related

to Environmental issues has commenced and some are yet to be implemented.

14

Table No.6.1: Compliance Status on Pre-Construction Environmental Issues of Moragolla Hydropower Project

Potential Root

Cause

Environmental

Issues

Management/

Mitigation Measures

Responsibility Compliance

Status/Remarks Planning Implementation Monitoring Supervision Review

Agency

Fish Poaching by

Project workers

Adverse impacts

on local fish

population

Preventing fish Poaching

Dissemination session for

all project workers and

Monitoring (spot checks)

of work sites adjacent to

the river

CEB CEB CEB CEB CEB To be implemented as

per the EMP

Blasting and

Excavation

Adverse impacts

on Labeo fisheri

distribution in

the Mahaweli

Ganga Section

near project

Confirmation of Fish

Distributions

(Fish Survey)

Fish survey of all the

pools above and below

the dam site

CEB CEB/Consultant CEB CEB CEB The fish survey work

was completed by the

Contractor Ms.

National Aquatic

Resources Research &

Development Agency

(NARA). Awaiting for

their report

Adverse impacts

on local fish

population

Catch-and- Haul

(Fish Translocation)

CEB CEB/Consultant CEB/FD/D

WC/NZG/

CEB/FD/DW

C/NZG/

CEB/FD/

DWC/NZ

G

To be implemented as

per the EMP based on

the fish survey results.

Site Clearance and

Inundation

Adverse impacts

on animals at

project site

Animal Rescue Program

Vulnerable animals will

be captured and moved

to adjacent habitat, if

possible or allowed to

move away from the land

clearing work sites.

CEB CEB/Consultant CEB/

Consultant CEB/IUCN/C

EA

CEB/IUC

N/CEA

To be implemented as

per the EMP

Losing habitats

of wildlife due

to land clearing

and inundation

Afforestation/Habitat

Enhancement Enhancing

habitat for wild life to

compensate lost habitats

by afforestation of 100m

buffer strip around the

reservoir

CEB CEB/Consultant CEB/

Consultant FD CEB/FD To be implemented as

per the EMP and the

preliminary work was

commenced.

15

5.0 Safeguards Monitoring Results and Unanticipated Impacts:

Environmental Monitoring Schedule

The individual environmental monitoring measures are identified in the EIA/Main Report and in the EMP and

relate primarily to those activities in which there are measurable environmental emissions (e.g. air quality, water

quality, noise, etc.). These activities are drawn together in the Environmental Monitoring Plan (EMoP), which

describes in detail the purpose of each monitoring activity and the methodology to be employed (including the

approach, parameters to be measured, survey locations, frequency, and other information). It also recommends

thresholds that will signal the need for corrective actions.

EMoP for this project is divided into four parts, equivalent to the different parts of the EMP such as Construction

Phase, Operation Phase, Special Issues - Aquatic Ecology, and Special Issues - Terrestrial Ecology. Construction

Phase shows that some quite extensive monitoring is required in relation to the three main fields in which there is

the most risk of impacts from the construction work (water quality, air quality and noise and vibration). This

involves monitoring at and around all of the main construction sites and several of the ancillary sites (quarry,

disposal sites and main transportation route), and before construction begins (baseline) and regularly throughout

the construction period. This monitoring is assigned to the contractor to raise awareness of the environmental

risks and impacts associated with the construction work and the way they need to be mitigated.

The remainder of this EMoP involves: small-scale monitoring to confirm the requisite E-flow is provided during

reservoir impoundment; regular monitoring of water levels in domestic wells during tunnel construction; and

checking the structural condition of buildings that may be at risk of structural damage throughout the

construction period. These activities are assigned to CEB because they involve contact with the public regarding

some quite sensitive issues, and because provision of a continuous E-flow is one of the main conditions of the

Environmental Approval for the project, granted by MASL. CEB will probably appoint specialized consultants and

contractors to conduct this work, but it is important that the responsibility for the monitoring and any resulting

remedial action remains with CEB as the Project Proponent.

EMoP for the operation stage of the project are not expected to be major environmental impacts during this

stage, so there is no need for extensive environmental monitoring. Monitoring in relation to the hydrological

changes downstream of the tailrace only requires simple checks, because if CEB mitigates these impacts by

operating the Moragolla and Kotmale stations out-of-phase in the dry season it is very unlikely that there will be

noticeable changes in flow when one station begins to operate.

EMoP for the Special Issues on Aquatic ecology and Terrestrial Ecology is shown in Table No. 7.1. Since the project

is at pre-construction stage, relevant activities in this table are planned to be carried out.

16

Table No. 7.1: Environmental Monitoring Plan for the Moragolla Hydropower Project: Special Issues

Impact Mitigation Monitoring Parameters Method Rsp Frequency Location

1. Aquatic Ecology: The project area supports 8 nationally threatened fish species, including Labeo fisheri, which is of high conservation priority. These species may be affected by disturbance, poaching, turbidity, blasting, etc.

Special measures to protect the rare fish include catch and haul (translocation) to the nearby Kelani River; and cutting channels in the river bed downstream of the dam to improve connections between pools in dry season

Catch and haul requires a prior survey to determine the presence and distribution of Labeo fisheri and other large species; and this should then be repeated during MHPP operation to assess changes in the populations

Monitor: Locations of river bed pools above and below the dam site; fish species present, their distributions and approximate numbers in pools in the river bed; locations of pools

Use an inflatable raft and portable electronic fish finder to determine depth of riverbed, numbers and depth of fish, & locations (GPS coordinates). Use small mesh nets to catch fish samples for species identification; release the captured specimens upstream or downstream

CEB

Two surveys: one pre-construction and one after one year of MHPP operation. Pre-construction survey has already commenced.

In all major pools in the river bed, at the sites of the reservoir and dam, down to Atabage Oya.

The translocation area in Kelani River should then be surveyed annually for the first four years after translocation to monitor survival and population expansion

Monitor: Fish species present and their distributions. Estimate population densities and record other features, such as breeding status

Use similar netting techniques to capture samples of fish in the translocation area

Five surveys: one baseline before translocation and then annually post-translocation

Kelani River, over around 5 km upstream and downstream

2. Terrestrial Ecology: The project will remove >900 trees, none of which are endangered. Terrestrial fauna includes 41 endemic or endangered species of which 5 are high priority1. These are not at risk from the project but their habitat will be enhanced

CEB will reforest a 100 m buffer around the reservoir to reduce soil erosion and planting will incorporate measures to provide habitat for the 5 priority faunal species

The planted area will need to be regularly monitored so that dead seedlings can be replaced and other remedial action (weed removal, disease treatment, etc.) planned and implemented as necessary

Monitor: seedling deaths, indications and presence of pests and disease, invasive species, human encroachment, farming and other unauthorized activities

Conduct walkover surveys of features that can be recognized visually (seedling survival, encroachment) and smaller scale investigations of other aspects (pests, disease). Record locations on maps to plan remediation

CEB

Surveys every 3 months for the first year, then every six months for the next four years

Cover the whole planted buffer zone

When the MHPP is operating the main mitigation will be to protect the reservoir catchment from human impacts by implementing a Watershed Management Plan to improve vegetative cover, stabilise soil and enhance faunal habitat

Once the WMP is underway there needs to be regular monitoring of the key expected improvements in order to record progress and plan refocusing if needed

Monitor: the key parameters in which improvements are needed: soil conservation, vegetation cover and the presence of the key faunal species (reservoir and river water quality will also be monitored as described above)

Monitoring methodologies will be developed in detail during the planning stage for the WMP

Surveys every six months, plus shorter-term records of aspects like faunal sightings when appropriate

The overall WMP area, and in particular those locations targeted for specific activities

Note 1: Complete detail is included Volume 4 – Additional Environmental & Social Studies; Report 12 – Expert Report on Habitat Creation and Management to enhance Terrestrial

Biodiversity by IUCN in Environmental and Social Studies submission of February 2014.

17

6.0 Implementation of Grievance Redress Mechanism and Complaints Received from Stakeholders

Construction activities of hydropower projects, especially where Involuntary Resettlement is involved, might

give rise to grievances among Affected Persons (APs), however much the potential sources of conflict have

been addressed in Environmental Management Plans and Resettlement Plans and Policies. Grievances may

be related to social issues such as eligibility criteria and entitlements, location of resettlement sites, quality

of services at those sites, allocation of houses, livelihoods and social and cultural issues, etc. Grievances may

also be related to environmental issues such as dust generated due to clearing and grubbing works,

vibration and damages to structures, noise, traffic congestion, decrease in water level and water pollution in

private and public wells due to blasting and tunneling, damage to tea plantations and agricultural lands, etc.

Social grievances occur mostly at the time of implementation of the Resettlement Action Plan; and

complaints on environmental issues and public nuisances generally occur during the construction period.

Both types of grievances are different in nature. However, it is imperative to have a mechanism in place to

examine each and find solutions in a transparent manner, to demonstrate to the people that their

grievances are examined carefully.

The Moragolla Hydropower Project, in keeping with the ADB and national safeguard policies, will set up a

Grievance Redress Committee (GRC), which will function as an independent body to find solutions to

grievances and disputes among the affected and concerned parties.

The tentative nominations for the GRC was received by the PMO and formal setting up of the committee

was done. Formation of the GRC was notified to the general public by publication of a notice in national

newspapers in three languages i.e., Sinhala, Tamil and English. The local community was also informed

about the grievance handling procedures of the project through Grama Niladharis1of the area and displaying

notices at important public places within the Divisional Secretariat Divisions of Udapalatha and Ganga Ihala

Korale.

The following members to the GRC was appointed. Mr. J C Ranepura - Additional District Secretary (Lands)

of the Kandy District will function as the Chairperson of the GRC. Ven. Bowala Wimaladhamma and P G

Wijethunga from Udapalatha DS Division and Ven. Mawathure Chandima and K M A Illangakoon from Ganga

Ihala Korale DS Division will represent the Members from the Affected Persons (AP). Mr. H M C D Herath -

Civil Engineer of the PMO, nominated by the Project Director of the MHP will serve as the Secretary to the

GRC. An honorarium will be paid to the members of the GRC; the required funds for operation of the GRC

will be borne by CEB.

During this reporting period, only effective social activity in progress is the land acquisition process, and no

requests and grievances received to PMU.

Meanwhile Mr. Prashan De Silva, owner of the Aqua Dunhinda luxury retreat, has raised his concern over

the impact/effect on the reduced water flow and the sediment flushing through a bottom outlet of the

Moragolla reservoir dam, by his letter dated December 21, 2016. PMU has discussed with him in detail in

connection with his concern and explained the remedial measures taken for the protection of ecological

environment in the immediate downstream of the reservoir. Also, the proposal given for the sediment

flushing from the bottom outlet in an environmentally friendly manner was explained in detail. Finally, he

agreed with the proposal given by the project to protect the environment.

1Grama Niladhari (Village leader) is a Sri Lankan public official appointed by the central government to carryout administrative duties

in a Grama Niladhari division, which is a sub unit of a Divisional Secretariat. The duties of a Grama Niladhari include the reporting of

issuing of permits, gathering statistics, maintaining the voter registry and keeping the peace by settlement of personal disputes. They

are responsible for keeping track of any criminal activity in their area and issuing character certificates on behalf of residents when

requested.

18

7.0 Supplementary Environmental Impact Assessment Report

The feasibility study for the project was carried out by the Central Engineering Consultancy Bureau (CECB)

during 2009-2012. Environmental Impact Assessment (EIA) was also carried out in parallel with feasibility

study. EIA approval was obtained in August 2013 from Mahaweli Authority of Sri Lanka (MASL), the Project

Approving Agency (PAA) for the project.

Subsequently Detailed Engineering Design (DED) was carried out. During DED, the consultant reviewed the

Feasibility Study Reports (FSR) and carried out additional investigations, surveys and studies to ascertain the

suitability of proposed components in the project layout as proposed in the FSR. Based on this information,

the consultant carried out the optimization of the project, in a sustainable manner on social, environmental

and economic aspects. Accordingly, certain Project features were altered than that in the feasibility study

report. Some of the Project alterations are as follows.

1. A bottom outlet to be added

2. Shifting of the dam axis by 100m downstream

3. Environmental flow release through a micro Hydropower plant at the toe of the dam instead of

direct releasing to the downstream

4. Proposing diversion tunnel as an additional alternative for river diversion

5. Underground penstock instead of surface penstock

6. Shifting of Switchyard location

7. Power station access through causeway across Mahaweli river

8. Use of new disposal area

9. Use of new quarry site

10. Co tra tor’s orki g area-3 sites

11. Location change Resettlement village

In order to address the above alterations of the project features, MASL has requested to prepare and send a

Supplementary Environmental Impact Assessment Report (SEIAR) for approval.

A report was prepared by external Consultants and sent to Mahaweli Authority for approvals in May 2016.

After several discussions with the appointed Technical Committee, revised SEIAR was submitted. SEIAR was

opened for public comments from October 27, 2016 to December 8, 2016. Public comments were received

by CEB on December 19, 2016 and reply to them was sent on early January 2017. Meanwhile the EIA

approval already given expired on August 2016, and upon request for extension the PAA informed that it

will be given along with the approval for the SEIAR. Final approval is pending.

Some of the key dates on the activities of the Supplementary EIA approval process is given below.

Table No 8.1: Key activities of the SEIA approval process

No Activity Date

1 TEC meeting for Project Modifications @ MASL Head Office

and Decided to go for SEIAR

February 05, 2015

2 Requested to NBRO for Proposal and Cost Estimate March 06, 2015

3 TOR for SEIAR Received March 23, 2015

4 NBRO Proposal and Cost Estimate received March 26, 2015

5 Request for CEB General Ma ager’s Approval for obtaining

consultancy service from NBRO. However, GM did not grant

the approval and advised to get consultancy service from

individual consultants for each Environmental field and

prepare SEIAR

April 07, 2015

19

6 Requested to CEB, AGM(P) for approval and appointment of

TEC

May 05, 2015

7 TEC Appointment May 11, 2015

8 Preparing RFP and TEC report and submission to

Procurement Committee for obtaining consultancy service

from individual Consultants, directly

June 15, 2015

9 Procurement Committee approval obtained subjected to the

approval of Secretary (MOPE)

July 10, 2015

10 Approval of Secretary (MOPE) received July 29, 2015

11 Proposals called from individual consultants Aug. 04, 2015 to Aug. 20, 2015

12 All consultants responded except for the field of Socio

Economy Aspects. TEC report submitted to Procurement

Committee after evaluation above received RFP. In addition,

it is requested for approval to get another Consultant for

Socio Economic Aspects

September 18, 2015

13 Procurement Committee Approval received subjected to the

approval of Secretary (MOPE) for Socio Economic Consultant

September 29, 2015

14 Approval of Secretary (MOPE) received for Socio Economic

Consultant

October 13, 2015

15 Proposals called from Socio Economic Consultant Oct 13, 2015 to Oct 20, 2015

16 TEC Report submission to DPC (For Socio Economic

Consultant)

October 28, 2015

17 Awarding of Consultants including NBRO October 01, 2015

18 Awarding to Socio Economic Consultant December 01, 2015

19 SEIAR submission to MASL May 18, 2016

20 TEC meeting @MASL June 14, 2016

21 Meeting minutes of TEC meeting July 18, 2016

22 Revised SEIAR Submission Aug 12, 2016

23 TEC Meeting Sep 13, 2016

24 TEC comments Sep 26, 2016

25 Revised SEIAR Submission to Publish in 3 languages Oct 24, 2016

27 Publish in Local Newspapers Oct 27, 2016 to Dec 08, 2016

28 Public comments submitted to MHP December 19, 2016

29 Reply to Public Comments December 29, 2016

30 TEC meeting January 19, 2017

31 Special meeting for technical issues on bottom outlet and

dam crest

February 02, 2017

32 MASL decided to grant approval and subject to concurrence

of Central Environment Authority (CEA)

(CEA waiting for DWC recommendation on Labeo fisheri and

DWC waiting for NARA report on fish survey)

February 21, 2017

8.0 Fish Surveying, Translocation and Monitoring of the Labeo fisheri along the Mahaweli River

EIA of the proposed Moragolla hydropower project has been approved in year 2013. But at the time of EIA

studies, it has not identified the endangered Labeo fisheri fish species which is present in the Mahaweli river.

Nonetheless the fish was identified with the detail design stage and it was mentioned In the Volume 1 of the

Environmental and Social Study Report (Environmental Main Report) of Moragolla Hydropower Project. As

per the Environmental Main Report it was a mandatory requirement to do the Fish Surveying, Translocating

(catch-and-haul) and Monitoring of the Labeo fisheri within the affected area in the Mahaweli River (clause

20

307, page 129). In line with the above requirement a Technical Evaluation Committee (TEC) was appointed

by CEB to prepare Terms of Reference (TOR) and to proceed with the tender to select a contractor to carry

out the work.

According to the approved TOR, proposals were requested by CEB by publishing a paper advertisement and

bids were closed January 06, 2016.

Contract was awarded to Ms. National Aquatic Resources Research & Development Agency (NARA) to carry

out a fish survey along Mahaweli River. A Technical Committee was also appointed to oversee the

implementation of fish survey and translocation process. After approvals from Department of Wildlife

Conservation (DWC), NARA has commenced the fish surveying work. Initial fish surveying was carried out and

temporarily suspended due to turbid water. NARA has requested for permission from DWC to use different

trapping system due to fast flowing rate and less transparency. After approvals from DWC, NARA has

completed the fish surveying work. It was observed that Labeo fisheri was present in the vicinity of the

project area and awaiting for their report.

The important triggers in this process were listed below.

Table No. 9.1: Key activities of the Fish Surveying, Translocation and Monitoring of the Labeo fisheri

No Activity Date

1 CEB requested to appoint a TEC to oversee the implementation of

Fish surveying and translocation of Labeo fisheri from IUCN, Forest

Department, National Zoological garden, and Department of Wild

Life Conservation

November 18, 2015

2 Pre-Bid meeting and site visit. December 18, 2016

3 EML Consultants (Pvt.) Ltd has request for an extension of date of

proposal submission on surveying and translocation of Labeo fisheri.

January 01, 2016

4 BID opening and two bids were received at the closing time January 06, 2016

5 TEC recommends to award the contract for carrying out Surveying,

Translocating, Monitoring and Relocating of Labeo fisheri to National

Aquatic Resources Research & Development Agency (NARA)

January 19, 2016

6 Latter of Award had been issued to NARA February 8, 2016

7 Letter of Acceptance by NARA February 18, 2016

8 CEB requested to appoint a Technical Committee comprising

representative from Mahaweli Authority, NAQDA, CEA, etc. to

oversee the implementation of Surveying, Translocating, Monitoring

and Relocating of Labeo fisheri

March 28, 2016

9 Awareness programme on Surveying, Translocating, Monitoring and

Relocating of Labeo fisheri

April 11, 2016

10 Permission request from Wild Life for Surveying, Translocation,

Monitoring and Relocating of Labeo fisheri

April 11, 2016

11 Permission granted by Wild life Department only for Surveying the

Labeo fisheri

June 30, 2016

12 First Extension on Bank Guarantee up to 2017/01/16 from

2016/07/16

August 03, 2016

13 First surveying work plan submitted by NARA August 2016

14 Fish surveying started and subsequently the program was postponed. September 27, 2016

to October 24, 2016

15 CEB requested to obtain a report on Effects on Labeo fisheri due to

sediment flushing through the bottom outlet

November 09, 2016

16 Requested permission from Wildlife Department to use non-harmful

fish traps and electro fishing technique

December 10, 2016

21

17 Second surveying work schedule submitted and commenced by

NARA- No fish being recorded

December 19, 2016

to January 13, 2017

18 Third Extension on Bank Guarantee for another six months January 03, 2017

19 Submission of new work schedule by NARA February 7, 2017

20 Permission granted by Department of Wild Life for using non-harmful

fish traps and electro fishing technique

January 16, 2017

21 Rescheduled the surveys dates by NARA, Feb 16,2017 to March

11,2017

February 14, 2017

22 Surveying started with using non-harmful fish traps and electro

fishing technique

Feb 16, 2017 to

March 24, 2017

23 Survey completed, Labeo fisheri found in the river, and the final

survey report yet to submitted

March 31, 2017

Even though the total contract for the Surveying, Translocation, Monitoring and Relocating of Labeo fisheri had being

awarded to NARA, the remaining activities will depend upon the survey findings and with the recommendations of the

Department of Wild life and other stake holders.

9.0 River Flow Data on the Mahaweli River Downstream of the Moragolla Hydropower Plant

As per the Schedule No. 5 of the loan agreement No 3146-SRI between Democratic Socialist Republic Of Sri Lanka

and Asian Development Bank, dated November 20, 2014 it is a mandatory requirement to collect hourly, daily

and monthly flow data on the Mahaweli river downstream of the Moragolla Hydropower Plant tailrace and

the confluence with the Atabage oya for a period of one year to identify the minimum required downstream

environmental river flows during the dry and wet seasons to satisfy the critical habitat requirement of the

Safeguard Policy Statement.

Accordingly, a contract was awarded to Ms. Access Energy (Pvt) Ltd to obtain river flow measurements along

Mahaweli River. Flow measurements were commenced from June 2016 and ongoing. A detail report in

connection with the above is attached in Annexure 1.

10.0 Conclusion and Recommendations

EMP provides the framework for implementing the environmental mitigation, enhancement and

compensation. It is in four parts, comprising EMPs for construction and operation phases, and EMPs for the

two special issues (aquatic and terrestrial ecology) where mitigation is more complex and requires action in

all phases. Each part deals with specific environmental issues, in turn, summarizes the potential impacts and

mitigation to be applied, and assigns responsibility for each action.

At present, the Project is in pre-construction stage due to some unavoidable reasons. In this stage, special

consideration has to be given for the conservation of Labeo fisheri in which fish surveys for identifying their

baseline and establishing control points for monitoring before resuming construction and thereafter surveys

for annual monitoring should be conducted. A contract was awarded to carry out fish survey and

translocation process and the survey work was completed. In addition, another contract was awarded to

obtain river flow data along the Mahaweli River at the location recommended in Loan Agreement.

Mitigation in the construction phase is mainly the responsibility of the contractors and action in the

operational phase is mainly allocated to CEB; but some action is required of both parties, and the design

consultant, in all phases. Construction contracts will require contractors to provide all mitigation and conduct

all monitoring work assigned to them in the EMP and EMoP.

The EMoP provides the mechanism to ensure that: a) all of the actions to provide the mitigation are taken as

set out in the EMP; b) the actions mitigate impacts and protect the environment as intended; and c) residual

impacts of the project are recorded, so that additional mitigation can be provided if any unexpected impacts

occur. The EMoP is in the same four parts as in the EMP and includes: physical and chemical monitoring of

22

emissions; biological surveys of fish, planted vegetation and other features; and social surveys of river users.

In each case the approach to the monitoring is described, including the method, parameters, location,

frequency, and responsibility; plus guidance on threshold levels that would trigger corrective action.

Emissions monitoring is mainly the responsibility of the contractor, to raise awareness of the impacts of

construction activities and the mitigation needed. The remainder of the monitoring is assigned to CEB as the

Project Proponent, although this may be outsourced to specialist consultants and contractors if necessary.

CEB has established a Grievance Redress Mechanism (GRM), to ensure that any concerns, complaints and

grie a es a out the proje t’s e iro e tal perfor a e are re ei ed a d resol ed. This ill ha e t o levels: a) initial complaints received by the contractor or client on site will be resolved in situ where possible

by discussion with the complainant and subsequent agreed action; b) any issues that cannot be resolved

locally will be referred to a Grievance Redress Committee (GRC), comprising senior representatives of local

government and the project agencies (client, contractor, supervision consultant), the local community and

Affe ted Perso s. A o plai ts register ill e ai tai ed i the lie t’s site offi e a d by the GRC. CEB will

inform complainants in writing of decisions made, action to be taken and the program. Decisions by the GRC

will be deemed final, although complainants may take further action through a court of law if they wish.

Implementing EMP for the project was delayed by a few months. However, since commencement of the

construction phase had been shifted, these lapses can be recovered with the immediate startup of relevant

activities of EMP in this phase.

23

Annexure 1

CONSTRUCTION OF MORAGOLLA HYDROPOWER PLANT

ADB LOAN NO. 3146 SRI

River Flow Data on the Mahaweli River Downstream of the

Moragolla Hydropower Plant

24

1. Introduction

1.1 General

Moragolla Hydropower Project (MHP) is one of several hydropower projects identified by the Government of

Sri Lanka (GoSL) to reduce the role of fossil-fuelled power generation, which has outstripped hydropower over

the past 30 years. Returning hydropower to greater prominence would promote sustainable development and

reduce greenhouse gas emissions in line with the National Climate Change Policy, and limit exposure to

fluctuating international fuel prices. The Executing Agency is the Ministry of Power and Renewable Energy

(MoPE) and the Implementing Agency is the Ceylon Electricity Board (CEB).

The project will be located in the upper reaches of the Mahaweli Ganga in the Central Highlands of Sri Lanka,

approximately 22 km south of Kandy City and 130 km north-east of Colombo.

The project involves construction of a 37 m high, 236 m long concrete gravity dam (crest at 550 masl), to

create a 38.5 ha, 1.98 MCM reservoir with a Full Supply Level (FSL) at 548 masl. The concrete spillway

contains 5 radial gates (13m x 15m) designed to pass a 10,000 year flood (6,700 m3/s) with no increase in

FSL. Water will be diverted by an intake just upstream of the dam, into a 2.7 km , 4.7 m Ø underground

headrace tunnel, surge tank and penstock on the left bank, to an above-ground powerhouse and 28 m open-

channel tailrace outfall, through which water will return to the river.

The Project is a daily peak generation power station with an installed capacity of 30.2 MW (2 x 15.1 MW),

having a rated head of 69.0 m and discharge of 50 m3/s. The dam includes a pipe to discharge a constant

“Environmental Flow” (E-flow) of 1.5 m3/s, which will pass through a micro-hydro plant on the right bank,

generating an additional 360 kW.

1.2 River flow measurement

Schedule No. 5 of loan agreement No 3146-SRI between DEMOCRATIC SOCIALIST REPUBLIC OF SRI

LANKA and ASIAN DEVELOPMENT BANK, dated November 20, 2014 has specified that CEB shall

undertake, to the satisfaction of ADB, to collect hourly, daily and monthly flow data on the Mahaweli river

downstream of the Moragolla Hydropower Plant tailrace and the confluence with the Atabage oya for a period

of one year to identify the minimum required downstream environmental river flows during the dry and wet

seasons to satisfy the critical habitat requirement of the Safeguard Policy Statement.

CEB shall also ensure that such minimum required downstream environmental river flows are maintained

following the completion of the Moragolla Hydropower Plant to avoid any measurable adverse impact on the

habitat of the endangered Green Labeo fish.

In order to meet the above requirement, a contract was awarded to Access Energy (Pvt) Ltd. No. 278, Union

Place, Colombo 02, Sri Lanka to measure the hourly river flow on the Mahaweli river downstream of the

Moragolla Hydropower Plant tailrace and the confluence with the Atabage oya for a period of one year starting

from June 2016 to May 2017.

1.3 The river flow measurement location

Access Energy (Pvt) Ltd. No. 278, Union Place, Colombo 02, Sri Lanka was awarded the contract to measure

the hourly river flow on the Mahaweli river downstream of the Moragolla Hydropower Plant tailrace and the

confluence with the Atabage oya for a period of one year starting from June 2016 to May 2017.

Fig 1.1 shows the location at the Mahaweli river where flow measurement were carried out by the contactor.

25

Fig 1.1 River flow measurement location

Fig 1.2 and 1.3 shows the location of the data logger and pressure transducer installed underwater

respectively by Access Energy Pvt(Ltd) for the measurement of the river flow.

Fig 1.2 Data logger Fig 1.3 Pressure Transducer location

The flow measuring system is based on the indirect discharge measurement technology. In this indirect

method only the water level is recorded and the discharge is computed by reference to a rating curve relating

the water level with the discharge across the section. A hand held current meter which works on magneto-

induction principle and having no moving parts was used to develop a rating curve for discharge

measurement.

Data

Logger

26

2.0 Flow Data

2.1 Hourly Flow Data

As shown in fig 1.1, the Kotmale power station discharge is released to the Mahaweli River upstream of the

flow measuring location. In addition the water from the Atabage Oya also connected to the Mahaweli River

upstream of this measuring location. The water discharge from the Kotmale Power Station when in operation,

is an additional discharge to the natural flow of the Mahaweli River. Therefore this flow rate need to be

deducted from the measured river flow data in order to identify the natural flow rate of the river.

In order to calculate the natural flow of the river, the hourly flow rates from Kotmale discharge was obtained in

parallel to the hourly flow measurement data. Table 2.1.1 to 2.1.9 shows the hourly natural flow rate of the

Mahaweli River, after deducting Kotmale discharge, for the period from June 2016 to February 2017.

27

Table 2.1.1 Hourly Flow Data - June 2016

Location - On the Mahaweli River Downstream of the Moragolla Hydropower Plant Tail Race and the Confluence with the Atabage Oya

00:00 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00 20:00 21:00 22:00 23:00

1 50.80 46.88 45.60 44.60 40.20 39.40 53.95 52.80 57.50 51.52 65.00 56.56 55.52 55.40 48.10 42.40 49.36 47.51 43.35 46.44 46.50 38.69 50.66 37.40

2 53.20 27.20 32.00 34.80 33.24 31.44 35.36 35.28 32.64 27.44 40.43 33.00 28.37 37.10 33.80 27.00 28.40 26.40 34.00 12.80 21.09 12.46 31.68 41.00

3 33.40 30.40 25.95 31.90 30.40 30.40 24.00 23.00 22.16 18.60 23.44 12.52 26.00 24.40 21.08 24.32 16.60 29.64 24.40 16.36 32.60 33.00 27.16 32.56

4 56.40 29.24 28.36 30.60 21.00 24.96 21.60 30.00 20.24 18.29 27.28 30.56 29.90 42.30 31.93 42.86 36.20 62.40 52.75 46.80 59.80 65.88 91.68 106.80

5 90.20 80.30 74.45 62.80 54.60 50.20 43.20 40.56 44.00 42.40 38.40 33.60 31.80 29.16 33.04 33.00 31.36 32.96 33.96 12.16 32.40 41.30 24.96 48.40

6 37.52 38.56 36.16 35.65 35.65 28.40 24.01 35.20 29.24 20.60 23.13 27.74 30.12 30.03 32.51 24.76 33.00 35.72 32.04 12.20 24.14 20.49 22.35 24.16

7 53.60 21.44 24.20 22.08 22.60 20.16 24.40 31.72 23.60 56.87 22.76 30.90 28.99 37.40 23.84 29.30 14.45 24.45 20.00 10.36 31.20 13.60 49.75 30.43

8 29.70 31.16 31.89 30.43 31.16 28.92 29.70 28.14 28.14 13.32 23.75 23.00 28.36 29.76 36.27 28.66 28.36 31.20 22.65 29.20 33.16 28.64 34.15 29.18

9 46.00 32.62 32.62 31.16 29.70 28.14 24.21 25.20 29.70 18.20 23.98 23.69 20.34 26.41 24.04 17.48 24.00 30.04 15.36 27.80 22.36 29.00 33.44 45.20

10 37.00 32.62 31.89 31.16 29.70 19.30 25.60 31.15 37.75 27.86 21.90 19.30 24.50 28.90 17.80 26.41 27.91 31.90 30.40 21.20 33.00 50.50 37.00 35.54

11 35.54 35.54 31.89 32.62 30.43 31.16 14.10 28.15 29.65 35.40 30.40 28.20 25.78 25.55 24.33 24.97 20.86 24.80 24.16 10.92 33.16 20.12 22.71 25.90

12 27.36 24.24 25.02 23.46 25.80 24.24 25.80 25.80 27.36 26.58 26.58 25.80 25.02 24.24 24.24 24.24 22.68 24.24 11.19 18.84 29.24 24.97 34.08 30.43

13 35.54 45.25 56.00 60.80 58.40 71.20 42.64 49.76 48.25 41.60 38.48 38.15 42.08 44.96 48.68 40.75 36.60 57.50 50.16 42.35 63.00 54.40 54.80 64.00

14 51.25 47.50 47.50 46.00 43.75 33.11 33.16 37.60 38.88 31.16 37.40 33.96 36.40 33.60 30.56 39.60 29.76 29.00 33.05 17.64 30.20 19.28 30.45 28.90

15 32.62 30.43 32.62 33.35 31.89 33.35 20.80 33.40 34.90 20.84 32.56 24.64 30.16 31.72 26.00 22.24 27.96 32.60 23.20 20.76 16.00 17.60 32.36 33.05

16 17.24 28.14 26.58 27.36 28.14 25.80 28.14 27.36 26.58 19.65 16.64 13.96 24.04 10.96 20.64 24.92 18.20 24.40 17.60 40.20 21.24 18.56 38.60 22.20

17 44.50 25.02 23.46 22.68 24.24 17.75 18.40 19.16 22.56 17.40 15.80 15.08 23.28 25.80 11.44 10.96 18.00 23.60 24.40 22.20 25.00 53.00 20.40 31.89

18 27.36 28.14 29.70 28.14 26.58 27.36 16.20 19.52 11.00 16.80 26.20 24.20 21.80 25.60 28.90 38.00 44.40 44.40 54.00 89.71 99.20 81.20 54.00 48.25

19 42.25 40.00 37.75 35.54 34.08 31.89 33.35 31.89 31.16 29.70 30.43 28.92 27.36 28.14 28.14 26.58 27.36 27.36 26.58 17.76 27.60 23.46 28.15 29.65

20 29.70 30.43 31.89 30.43 30.43 26.36 28.20 31.20 26.80 32.92 22.76 14.88 24.20 14.56 16.68 25.92 31.32 27.05 28.55 30.11 29.59 26.20 27.80 33.04

21 28.40 28.20 28.66 26.64 27.56 29.64 15.96 32.36 18.40 33.24 39.84 39.16 43.00 44.04 45.20 39.84 41.08 41.80 37.04 24.84 36.52 41.24 47.52 47.84

22 80.79 76.00 100.16 94.00 83.52 84.76 103.76 85.55 79.29 91.76 100.16 103.76 101.36 101.36 91.24 97.24 104.64 97.24 92.40 88.60 97.60 82.95 66.96 34.15

23 12.54 25.02 25.80 25.80 24.24 25.02 24.24 24.24 20.30 24.88 24.96 15.36 19.56 22.64 21.04 23.68 23.00 21.57 19.49 23.40 18.56 21.20 26.70 22.15

24 37.75 36.27 37.00 37.75 46.75 21.40 15.50 13.30 11.45 10.41 21.40 11.00 17.35 22.90 19.95 20.35 16.31 21.40 21.40 21.40 31.89 21.90 21.90 23.46

25 20.72 22.68 20.72 20.72 22.68 20.72 21.90 22.15 12.55 22.15 19.20 17.00 18.50 18.50 25.02 20.72 20.72 18.36 20.72 19.30 10.24 21.80 20.16 19.94

26 34.81 18.38 20.36 17.86 22.15 19.21 14.95 20.01 16.66 16.95 19.21 19.21 19.94 17.02 19.94 18.48 18.48 19.21 18.48 20.67 17.02 19.21 19.54 15.50

27 18.36 16.00 15.50 18.36 16.00 16.00 18.36 19.89 17.81 11.16 11.80 13.65 13.41 25.02 15.50 16.00 15.50 15.00 16.00 16.29 11.44 14.60 12.96 13.28

28 25.15 18.48 17.18 14.50 15.50 17.18 14.64 36.24 19.21 18.17 17.46 16.65 17.96 29.65 22.68 24.24 23.46 21.90 22.68 14.10 25.36 23.36 22.68 24.24

29 22.68 23.46 25.02 23.46 24.24 37.00 20.00 25.44 19.94 21.39 20.67 19.94 19.95 15.55 14.16 14.45 18.15 23.70 12.50 22.00 22.00 24.00 36.20 22.68

30 17.18 15.50 15.50 17.18 15.50 15.00 13.28 16.50 15.78 13.80 14.40 16.20 15.20 15.50 27.33 23.08 20.52 28.59 19.36 27.28 16.72 19.48 19.80 28.90

Day

Flow Rate m3/sec

Time in Hours

28

Table 2.1.2 Hourly Flow Data - July 2016Location - On the Mahaweli River Downstream of the Moragolla Hydropower Plant Tail Race and the Confluence with the Atabage Oya

00:00 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00 20:00 21:00 22:00 23:00

1 25.80 15.50 15.00 14.50 15.00 15.00 12.88 16.30 16.24 13.29 14.96 7.60 17.16 11.83 16.29 14.83 14.83 17.02 16.29 14.64 18.55 15.56 14.83 14.10

2 14.50 12.80 14.00 13.50 13.50 14.50 13.18 13.56 9.52 7.40 17.16 7.60 14.85 19.95 16.29 12.55 12.55 12.55 11.82 22.90 41.60 34.15 29.70 12.10

3 11.40 13.50 12.10 12.80 12.80 12.80 5.07 10.88 11.11 10.41 9.95 9.66 9.95 7.70 17.02 11.50 11.50 13.27 11.24 12.80 20.16 11.80 20.44 25.02

4 11.40 11.40 13.50 11.40 11.40 7.86 11.28 11.73 5.15 19.30 9.64 8.40 14.84 16.40 8.91 9.36 12.20 15.20 10.46 10.96 7.32 17.80 13.50 12.80

5 11.40 10.70 12.10 11.40 10.00 10.70 10.20 11.76 11.76 5.45 9.60 11.56 10.88 18.12 10.41 11.20 12.26 11.05 8.45 7.35 10.30 11.76 11.76 11.76

6 10.98 13.06 11.09 7.86 11.91 9.65 6.00 11.80 11.05 11.05 5.80 6.60 12.60 13.32 11.76 10.98 12.54 16.29 9.42 9.55 11.00 10.52 13.35 5.07

7 8.12 8.91 8.90 11.76 13.32 9.54 14.85 11.80 7.81 8.76 14.16 9.14 9.77 14.05 9.25 5.49 6.80 15.37 8.56 9.25 6.94 11.33 11.24 9.30

8 9.30 8.60 9.30 7.90 7.90 8.60 8.63 13.32 9.16 8.38 11.50 9.94 6.40 5.56 6.16 8.90 11.05 11.80 9.55 9.14 9.44 8.90 12.55 11.76

9 10.20 8.90 12.23 6.30 6.62 17.75 12.54 10.20 14.10 8.90 8.90 5.51 12.14 13.06 8.59 8.91 12.54 15.56 12.23 12.14 15.88 17.33 12.87 18.36

10 19.54 22.68 25.80 30.43 31.16 31.89 35.54 40.75 40.00 37.75 37.75 39.25 40.00 45.25 51.25 53.60 50.50 48.25 50.50 43.76 49.20 46.24 45.20 40.75

11 37.75 34.08 32.62 29.70 28.92 26.58 25.80 25.80 24.24 24.24 14.10 20.67 18.45 19.94 21.40 13.41 15.95 13.70 18.17 7.00 10.40 14.08 17.80 16.19

12 20.36 18.90 16.60 19.20 10.65 25.14 15.92 18.55 16.18 16.24 10.32 14.80 16.40 15.60 17.80 20.00 20.67 15.15 17.02 10.18 15.20 15.95 25.95 17.03

13 19.20 16.20 15.47 14.81 18.10 9.95 15.56 15.37 13.35 7.20 21.60 9.25 13.81 20.56 9.20 17.97 14.40 14.80 14.05 15.67 22.20 14.52 14.42 16.00

14 15.00 14.50 16.00 18.36 16.00 16.00 7.70 17.02 16.92 8.91 14.20 8.84 7.60 15.40 20.67 13.79 15.25 14.83 11.50 14.88 23.20 14.05 25.28 13.32

15 16.29 14.10 11.51 13.60 13.60 16.95 17.70 16.40 9.90 9.90 12.79 12.04 17.75 15.36 10.65 14.00 15.56 14.83 14.01 17.70 16.61 15.15 15.88 12.96

16 15.36 13.69 9.74 7.59 9.12 17.34 20.05 17.05 14.22 7.24 6.64 8.96 6.96 5.20 12.08 11.75 12.50 22.49 8.91 17.16 19.52 22.80 14.74 13.28

17 14.84 15.91 6.55 12.66 10.68 9.15 5.80 13.28 17.75 6.11 10.00 6.80 7.68 17.44 5.07 10.13 13.28 12.50 6.84 9.15 10.99 18.48 13.27 14.42

18 14.42 13.08 18.48 14.01 11.75 13.60 12.40 11.85 5.15 11.56 16.20 8.90 18.00 8.50 13.12 6.12 9.40 9.20 13.00 10.75 12.76 13.56 23.76 9.42

19 10.68 33.60 7.35 9.54 8.90 12.87 17.02 11.51 10.58 15.16 15.33 15.76 5.80 5.49 6.40 6.52 10.00 8.64 12.64 14.16 13.60 11.20 9.43 14.21

20 6.56 9.95 9.95 11.51 8.18 15.36 5.96 13.01 15.12 5.80 14.04 9.52 8.72 12.36 14.85 8.96 13.64 13.64 15.95 7.60 9.60 8.10 14.73 8.90

21 7.34 15.15 9.32 9.94 8.91 12.25 6.36 13.76 9.16 10.64 10.20 7.80 11.27 10.52 13.18 22.25 9.54 10.20 13.32 9.42 8.64 8.64 7.08 8.64

22 8.80 6.56 14.10 7.34 10.36 7.03 9.16 9.94 7.77 4.43 5.27 17.04 7.41 8.80 4.51 7.56 8.44 14.05 9.90 15.08 10.58 7.41 8.16 8.90

23 9.94 7.66 9.16 7.08 6.30 14.82 14.20 8.44 6.89 13.80 5.50 5.20 9.42 13.76 6.00 9.25 5.84 12.60 5.44 7.36 5.20 14.80 11.50 5.78

24 8.07 10.20 7.34 8.49 7.34 14.86 5.52 16.76 5.50 11.45 12.95 4.16 8.72 15.89 15.26 9.90 11.82 5.48 8.96 14.64 14.64 8.40 5.76 19.30

25 14.75 17.75 13.69 18.16 14.01 6.94 7.76 15.56 9.90 20.80 16.04 21.91 15.47 17.75 11.82 6.73 19.03 16.82 17.75 14.63 8.73 16.71 15.56 7.03

26 14.74 10.16 11.82 8.81 5.89 7.45 7.40 11.05 5.90 8.24 9.44 7.56 16.60 15.60 16.44 12.13 11.82 10.68 7.76 15.14 9.77 29.65 8.90 14.83

27 12.54 13.32 13.32 9.22 9.95 8.71 8.24 13.80 6.01 14.40 6.54 5.04 5.08 16.01 6.65 15.20 15.55 18.26 9.16 11.04 9.66 8.91 8.90 7.08

28 7.76 11.51 13.32 9.22 11.10 16.70 9.64 8.12 8.81 6.62 10.05 15.60 6.08 9.71 5.20 7.84 7.60 15.49 6.08 5.20 14.56 15.12 10.67 9.94

29 13.06 7.86 12.28 9.63 8.08 15.03 10.06 12.55 10.16 14.96 7.05 6.30 4.52 6.60 5.55 6.84 6.00 8.32 6.94 15.36 11.62 16.41 5.55 14.10

30 5.89 7.55 15.46 9.94 16.29 11.09 13.28 16.29 10.68 16.29 17.34 26.00 41.20 50.20 50.00 44.40 41.20 34.90 34.61 27.64 41.20 33.11 28.90 28.92

31 25.80 24.24 22.68 21.90 21.90 19.54 14.40 19.94 19.21 19.94 18.36 17.75 15.50 15.78 20.36 17.46 20.99 16.54 17.69 13.48 10.92 23.20 31.15 21.81

Day

Flow Rate m3/sec

Time in Hours

29

Table 2.1.3 Hourly Flow Data - August 2016Location - On the Mahaweli River Downstream of the Moragolla Hydropower Plant Tail Race and the Confluence with the Atabage Oya

00:00 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00 20:00 21:00 22:00 23:00

1 17.18 15.00 14.50 15.00 14.50 14.50 11.31 17.55 7.77 17.02 15.47 9.67 9.96 14.01 13.59 11.82 12.55 13.59 12.54 7.06 17.20 15.56 14.83 6.72

2 36.27 8.07 10.67 13.38 9.54 13.91 11.51 10.88 5.80 6.55 13.18 6.55 12.44 5.26 7.35 9.95 6.62 10.78 5.90 7.88 15.55 13.47 12.04 15.50

3 9.30 9.30 9.30 8.60 8.60 8.60 11.40 14.63 5.22 5.16 4.70 5.45 6.03 7.53 7.04 5.58 4.70 6.20 9.42 10.78 10.05 9.30 7.90 7.20

4 6.50 7.20 8.60 7.90 7.20 7.20 8.60 7.86 7.86 6.21 6.55 5.80 5.07 16.51 9.42 7.34 7.45 13.69 8.64 9.54 11.75 17.34 31.89 25.80

5 27.36 9.94 5.58 8.90 5.16 6.10 6.52 5.52 8.38 5.80 7.30 8.05 6.55 14.83 7.20 6.50 5.99 5.99 5.99 14.00 9.23 7.08 6.24 6.24

6 7.20 6.24 5.99 4.04 7.86 5.26 7.08 7.08 7.86 6.82 8.64 8.64 6.30 7.08 8.90 5.16 6.30 7.08 7.60 5.52 6.04 6.56 8.64 9.42

7 10.30 5.78 7.08 5.12 7.60 13.69 9.16 10.98 7.86 4.74 6.30 4.74 3.44 3.44 5.00 8.38 7.60 10.72 9.42 5.69 7.88 9.64 5.78 7.86

8 13.50 5.47 5.22 5.22 5.47 5.47 5.22 5.22 5.47 6.30 4.75 5.48 5.33 6.26 5.26 5.52 6.04 1.58 5.12 5.33 5.55 10.72 6.30 7.86

9 4.22 21.90 5.99 4.96 4.96 5.22 1.58 2.76 6.30 6.83 4.72 6.92 4.80 5.48 5.00 5.78 4.22 3.94 4.98 5.78 7.86 7.08 10.00 5.99

10 5.99 5.99 6.24 5.99 5.99 5.99 5.73 6.24 5.73 2.14 7.08 5.16 5.06 4.43 6.04 3.70 5.26 5.26 2.14 5.50 11.80 10.20 10.70 5.22

11 4.96 4.96 5.22 4.96 5.22 4.96 4.96 4.96 4.70 10.98 5.26 4.48 4.43 5.52 6.40 4.00 5.52 4.75 4.58 4.80 5.04 4.72 11.76 5.47

12 4.70 4.70 4.70 4.44 4.70 4.70 4.44 4.44 4.44 4.22 5.78 5.26 5.26 5.12 5.26 6.82 5.52 5.26 5.12 3.29 6.14 6.14 4.22 6.56

13 6.21 4.74 3.56 6.30 1.58 6.56 6.56 5.26 5.52 3.44 5.52 4.48 6.04 3.70 4.74 4.74 4.22 5.26 5.99 5.85 8.05 8.64 11.76 18.36

14 5.22 5.22 4.96 5.22 5.47 5.47 5.12 4.34 6.30 4.74 6.04 6.04 6.30 7.08 8.90 6.30 8.64 6.30 8.64 8.32 10.32 6.52 5.32 16.00

15 9.30 7.90 10.00 10.00 11.40 10.70 10.00 10.70 9.30 11.76 9.42 9.42 9.95 8.91 9.42 9.68 10.98 10.20 18.36 9.90 11.28 14.97 23.20 34.15

16 39.25 27.36 25.02 22.68 20.72 19.54 17.18 15.50 17.18 17.44 18.17 16.92 9.40 18.12 21.00 22.16 14.35 17.75 15.46 13.69 16.71 13.50 12.10 12.10

17 13.50 11.40 11.40 12.10 12.80 10.70 12.54 7.03 7.76 13.32 10.20 10.36 9.54 28.14 8.12 9.95 9.32 9.22 11.72 10.68 11.41 12.14 8.64 7.90

18 7.90 8.60 7.20 7.20 7.20 6.50 7.90 6.50 6.50 15.15 10.68 13.69 9.42 7.86 6.30 7.08 7.08 6.30 7.08 6.51 6.65 10.20 8.60 7.90

19 7.90 7.90 7.90 6.50 6.50 7.86 7.76 14.11 6.30 4.43 5.16 5.16 6.20 6.56 6.82 8.60 7.08 7.86 5.00 5.16 8.38 6.82 6.56 6.30

20 3.70 26.58 5.99 5.99 5.73 1.58 6.30 4.08 5.78 5.16 10.98 3.96 4.74 6.82 7.60 8.12 7.03 10.20 5.26 5.89 13.65 7.86 9.42 5.73

21 5.47 3.60 4.22 6.82 3.18 3.96 7.60 7.08 5.26 5.99 5.73 5.22 5.22 17.18 22.68 35.54 34.81 36.27 31.16 51.25 44.50 31.16 20.72 5.73

22 5.99 5.99 5.99 5.47 5.47 5.47 5.99 5.47 5.47 4.75 4.02 5.48 4.02 5.00 5.73 5.99 50.50 62.40 58.40 37.20 44.40 38.80 35.54 29.70

23 25.02 22.68 19.54 18.36 16.00 15.00 15.50 15.50 15.50 15.50 17.18 39.60 54.80 52.80 48.25 52.00 61.60 68.00 72.00 77.48 79.16 72.50 60.76 56.44

24 45.80 28.68 48.56 43.45 36.80 43.04 33.96 27.33 23.44 12.96 17.20 19.40 19.20 16.20 23.32 19.52 12.36 13.64 12.92 22.80 20.92 7.05 19.84 25.90

25 16.31 16.66 19.63 11.82 15.88 16.91 18.10 22.54 21.16 12.56 11.32 10.20 10.36 27.44 19.20 20.60 17.76 19.56 11.76 20.80 19.80 15.88 22.15 8.45

26 10.71 14.00 15.50 15.47 16.71 17.02 8.40 11.82 15.91 7.36 17.20 6.20 8.96 6.82 9.44 22.72 7.46 14.80 13.12 17.80 18.90 20.64 13.64 17.04

27 15.85 33.35 37.75 38.50 38.50 37.00 5.80 17.02 15.15 20.76 8.80 12.87 11.31 14.42 9.85 11.41 10.27 13.48 11.30 29.40 28.37 35.65 35.96 33.60

28 28.15 17.75 16.29 16.29 17.58 22.61 14.12 16.80 15.52 19.16 12.00 9.96 10.80 9.71 11.20 9.60 6.64 5.64 12.88 14.48 16.28 8.60 15.55 18.24

29 10.00 8.49 10.68 9.63 10.30 11.74 10.75 10.08 9.96 11.32 18.80 4.22 5.60 11.85 9.96 8.36 11.79 11.28 14.85 13.96 14.45 10.41 11.40 10.12

30 16.29 11.92 17.43 5.52 16.29 9.42 9.63 5.16 5.84 10.64 8.15 5.90 5.04 5.32 11.05 8.61 7.44 7.00 13.76 12.56 13.70 11.04 15.20 10.76

31 16.92 19.21 16.09 15.15 20.67 18.48 14.74 10.98 18.48 8.16 6.94 10.48 12.49 14.40 7.67 7.03 11.41 9.22 9.95 22.20 16.76 16.01 9.95 10.68

Day

Flow Rate m3/sec

Time in Hours

30

Table 2.1.4 Hourly Flow Data - September 2016Location - On the Mahaweli River Downstream of the Moragolla Hydropower Plant Tail Race and the Confluence with the Atabage Oya

00:00 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00 20:00 21:00 22:00 23:00

1 17.75 9.95 13.32 10.68 12.87 14.75 10.27 20.67 15.85 13.54 21.80 14.00 15.57 16.71 15.88 13.04 10.04 5.04 2.40 9.80 7.11 15.60 13.70 12.60

2 10.68 5.99 14.11 11.50 4.02 14.10 13.80 14.22 4.45 7.40 8.20 6.40 11.80 12.60 6.16 22.24 34.56 96.52 135.53 131.70 114.48 94.80 80.56 64.15

3 39.60 44.56 35.00 42.80 27.36 76.00 23.20 32.60 16.56 16.56 18.20 12.40 16.40 26.56 12.60 24.00 7.72 18.80 23.60 13.84 12.60 16.92 16.28 20.48

4 9.48 16.88 18.10 19.20 13.60 7.99 3.76 16.24 16.41 21.40 10.04 9.20 11.72 9.65 16.60 6.76 17.16 15.24 7.20 6.56 8.40 17.16 20.36 24.80

5 21.84 22.66 18.51 16.37 19.20 10.64 10.80 15.80 8.20 4.96 11.20 17.00 13.44 10.48 12.40 17.60 40.20 14.10 10.00 14.52 10.96 14.20 21.36 5.36

6 10.35 9.63 10.47 10.98 4.02 5.27 8.36 16.61 8.08 5.20 2.60 14.72 3.92 4.72 9.60 3.12 3.60 4.80 12.16 3.64 6.19 13.00 3.01 3.16

7 7.98 7.59 5.26 5.99 5.89 14.04 23.69 4.87 4.96 5.20 2.04 5.76 16.36 13.64 6.01 7.56 5.36 11.92 6.64 12.00 2.90 2.08 29.68 23.65

8 10.46 25.80 29.70 26.58 32.62 31.89 61.60 25.02 31.89 7.20 6.50 7.20 6.24 6.24 6.24 6.24 6.50 6.24 6.24 5.99 6.24 5.99 6.24 6.50

9 6.50 5.99 6.24 6.24 7.20 6.24 6.24 5.99 6.24 5.73 6.24 5.73 5.73 5.73 5.47 6.24 5.99 5.99 5.99 5.99 5.99 6.24 5.99 5.99

10 5.73 5.99 5.73 5.73 5.73 5.73 5.99 5.99 6.24 5.99 5.73 5.99 5.47 5.99 5.47 5.22 5.47 5.47 5.73 5.99 5.73 5.47 5.47 5.22

11 4.96 5.73 5.22 5.22 5.22 4.96 5.22 5.73 5.22 5.22 5.47 5.47 5.22 5.22 4.96 4.96 5.22 4.70 4.96 5.47 4.96 4.70 4.96 4.96

12 4.96 4.70 5.22 4.70 4.96 4.70 4.96 4.70 5.47 4.96 4.70 4.44 4.44 4.70 4.96 4.70 5.22 4.70 4.70 4.70 5.22 4.70 4.70 4.70

13 4.70 4.44 4.70 4.70 4.70 4.70 4.70 4.70 4.96 4.96 4.44 4.44 4.44 4.70 5.22 4.44 4.70 4.70 4.96 4.96 5.47 4.96 4.96 4.70

14 4.70 4.70 4.70 4.96 4.70 4.70 4.70 4.70 4.44 4.70 4.70 4.70 4.70 4.70 4.70 4.44 4.70 9.30 12.10 12.10 12.10 11.40 13.50 12.80

15 12.80 12.80 12.80 12.10 12.80 13.50 12.80 12.80 12.80 12.80 12.80 12.10 12.80 12.80 12.80 12.10 12.10 10.00 9.30 9.30 9.30 9.30 11.40 11.40

16 12.80 13.50 12.80 12.10 12.10 12.10 10.70 10.70 10.00 10.70 10.00 8.60 8.60 8.60 7.90 8.60 7.90 8.60 7.90 7.90 7.90 7.20 7.90 8.60

17 8.60 7.90 7.20 7.90 7.90 8.60 9.30 9.30 8.60 8.60 8.60 7.90 8.60 7.90 7.90 7.90 9.30 8.60 9.30 8.60 8.60 8.60 8.60 9.30

18 9.30 8.60 8.60 8.60 7.90 8.60 8.60 8.60 7.90 7.20 7.20 7.20 7.20 8.60 7.90 8.60 8.60 9.30 10.70 11.40 12.80 15.00 15.50 15.00

19 15.00 14.00 13.50 12.80 12.10 11.40 10.70 10.70 10.00 11.40 10.00 9.30 9.30 9.30 8.60 8.60 8.60 7.90 7.90 7.90 8.60 8.60 7.90 8.60

20 8.60 7.90 7.90 7.90 7.90 8.60 7.90 7.90 7.90 7.20 8.60 7.20 7.90 7.20 7.20 6.50 7.90 6.50 6.50 7.20 6.50 6.50 6.50 7.90

21 7.20 6.50 6.50 7.20 6.50 6.50 6.50 7.20 7.20 6.50 6.50 6.50 6.50 6.50 6.50 6.50 6.24 6.50 6.50 6.50 6.50 6.50 7.20 6.50

22 6.24 6.24 6.50 7.20 6.50 6.24 7.20 6.50 6.50 6.24 6.50 5.99 6.24 6.24 6.24 6.24 6.24 6.50 6.50 6.24 6.50 6.24 6.24 6.24

23 6.24 6.24 5.99 6.24 5.99 6.24 6.24 5.99 7.20 6.24 6.24 5.99 6.24 6.24 5.99 6.24 6.24 6.24 5.99 5.99 5.99 5.99 5.99 6.50

24 6.24 5.99 5.99 6.24 6.24 5.99 5.99 6.24 6.24 6.24 5.99 5.73 5.73 5.73 6.50 5.73 5.73 5.99 5.73 5.73 5.73 5.47 6.50 5.99

25 5.99 5.99 5.99 5.73 5.99 5.99 5.99 6.50 5.99 5.73 5.73 5.47 5.47 5.47 5.47 6.24 5.47 5.47 5.73 5.99 5.73 5.73 5.73 5.73

26 5.73 6.24 5.47 5.47 5.47 5.73 5.73 5.73 5.73 5.73 5.47 5.73 5.73 5.73 5.73 5.73 5.47 5.99 5.99 5.47 5.47 5.47 5.47 5.22

27 5.22 5.47 5.22 5.22 5.47 5.99 5.47 5.47 5.47 5.47 5.47 5.73 5.47 5.47 5.47 5.99 5.47 5.47 5.22 5.22 5.47 5.73 5.47 5.47

28 5.73 5.47 5.47 5.73 5.73 5.73 5.47 5.99 5.47 5.73 5.47 5.47 5.99 5.73 5.99 5.73 5.73 5.99 5.73 5.73 5.73 5.99 5.73 5.73

29 5.99 5.73 5.99 5.99 5.99 5.99 5.99 6.24 5.99 5.99 5.99 5.99 5.73 5.99 5.73 6.24 5.99 5.99 6.24 6.24 6.24 6.50 6.50 7.20

30 7.20 7.20 7.20 7.90 9.30 14.00 14.00 13.50 15.50 18.36 19.54 19.54 23.46 24.24 23.46 21.90 20.72 19.54 18.36 16.00 15.50 15.00 15.00 14.50

Day

Flow Rate m3/sec

Time in Hours

31

Table 2.1.5 Hourly Flow Data - October 2016

Location - On the Mahaweli River Downstream of the Moragolla Hydropower Plant Tail Race and the Confluence with the Atabage Oya

00:00 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00 20:00 21:00 22:00 23:00

1 17.18 16.00 15.00 16.00 17.18 16.00 15.50 15.50 16.00 15.00 14.50 14.00 14.00 14.00 15.00 13.50 13.50 13.50 13.50 12.10 12.80 12.10 12.80 12.80

2 13.50 12.10 12.10 11.40 11.40 12.10 12.80 12.10 13.50 12.10 11.40 11.40 11.40 12.10 11.40 11.40 12.10 10.70 10.70 11.40 10.70 10.70 10.70 10.70

3 10.70 12.10 11.40 11.40 10.70 10.70 11.40 11.40 11.40 10.70 11.40 10.70 10.70 10.70 10.00 10.70 10.00 10.00 10.00 10.00 10.70 10.00 10.00 10.00

4 9.30 10.00 10.00 9.30 9.30 9.30 9.30 10.00 10.00 9.30 10.00 9.30 10.00 9.30 9.30 9.30 10.00 9.30 12.80 7.70 8.97 9.72 5.91 3.20

5 7.08 21.90 5.99 5.22 5.22 5.47 4.96 4.70 4.44 4.19 4.44 4.44 4.19 10.00 4.96 4.19 4.19 4.19 4.19 4.54 3.18 4.70 4.19 4.19

6 3.93 4.19 3.79 3.93 3.93 3.79 5.73 9.30 4.44 4.19 3.93 3.93 4.19 4.96 4.19 4.19 4.44 4.19 3.93 4.35 3.60 3.60 19.54 4.44

7 3.93 3.79 3.93 3.79 3.79 3.93 4.19 4.19 3.93 3.79 3.79 3.79 3.64 3.64 3.36 3.50 3.64 3.64 3.79 4.43 2.15 2.15 1.58 4.44

8 3.79 3.64 3.79 3.79 3.79 3.93 3.79 3.93 3.79 3.79 3.64 3.64 3.64 3.50 3.50 3.64 3.50 3.36 3.50 3.70 6.50 3.79 3.64 3.50

9 3.50 3.50 3.64 3.64 3.64 3.64 3.64 3.64 4.44 3.93 3.79 3.79 3.79 3.79 3.93 3.93 4.19 4.19 4.19 4.96 4.70 4.70 4.70 4.70

10 4.70 4.44 4.70 4.19 4.44 4.44 4.19 4.70 4.19 3.93 4.19 3.93 3.93 3.79 1.48 4.40 3.20 3.99 5.15 3.65 5.10 5.90 5.90 5.90

11 4.41 5.91 4.74 4.74 6.04 3.70 7.04 4.22 12.10 4.70 4.70 4.19 4.19 3.93 3.79 3.93 3.93 3.93 3.79 6.30 1.58 7.08 6.56 4.60

12 3.70 3.70 4.48 6.30 15.26 14.10 8.07 6.30 5.26 5.99 4.70 4.44 4.19 4.19 3.93 3.93 2.50 5.89 5.12 6.36 6.82 5.99 4.44 4.19

13 3.93 4.44 4.19 4.19 3.93 4.06 4.97 18.36 4.70 4.44 4.44 4.19 3.93 3.93 3.93 3.93 4.70 3.93 3.93 4.34 8.12 10.00 4.96 4.96

14 5.47 7.20 7.90 10.70 15.00 17.18 17.04 43.00 20.72 18.36 18.36 16.00 15.50 16.00 14.50 14.00 13.50 12.80 12.80 16.50 11.93 14.00 13.17 11.09

15 11.40 10.00 8.60 8.60 8.60 9.30 19.84 12.54 15.00 9.30 9.30 8.60 1.40 19.20 10.08 14.85 17.18 7.90 2.52 17.36 11.16 13.60 17.18 11.40

16 10.70 9.30 12.10 11.76 14.10 12.14 12.23 27.36 10.70 8.60 7.90 8.60 7.20 6.24 6.50 6.50 5.27 6.55 4.99 4.92 6.44 6.20 13.30 17.02

17 12.02 9.42 10.98 10.72 9.94 8.08 1.44 32.65 9.30 7.20 6.50 5.80 5.40 5.28 12.05 13.24 15.36 20.53 12.92 22.20 8.00 15.40 26.56 16.47

18 12.20 13.06 9.94 8.38 8.38 7.06 11.53 17.52 4.12 15.26 15.81 16.90 20.36 16.00 12.15 14.75 18.95 18.16 14.78 38.32 23.00 13.80 22.56 6.60

19 18.50 12.43 17.81 14.01 4.96 7.92 7.00 12.92 4.55 16.37 21.54 8.31 19.47 19.76 5.68 13.24 23.80 16.60 1.96 22.20 11.20 20.72 15.00 19.21

20 12.54 13.32 12.54 12.28 13.06 5.16 13.79 15.00 10.00 18.90 13.27 1.86 4.76 24.72 17.22 9.40 13.52 13.04 14.52 12.46 8.20 11.44 27.36 10.00

21 7.20 7.20 7.90 7.20 7.20 6.50 3.70 13.50 8.60 7.20 5.16 10.29 12.60 8.49 13.69 8.49 15.10 14.10 11.20 16.80 18.55 13.64 13.80 8.81

22 12.54 12.28 12.54 12.54 14.10 1.52 14.01 15.14 5.80 4.85 11.51 5.80 13.28 6.30 11.51 11.09 12.54 13.32 6.62 14.20 21.60 11.50 10.00 14.00

23 22.68 23.46 21.90 21.90 18.36 14.10 19.65 19.03 10.65 16.19 14.00 14.00 12.76 18.79 20.67 11.72 15.85 18.50 17.80 18.48 17.96 19.80 24.24 22.68

24 22.68 21.90 20.72 19.54 18.36 19.54 10.20 23.46 17.18 15.50 16.00 16.00 16.00 19.54 37.00 47.50 52.00 56.80 67.20 95.45 184.30 245.50 229.00 193.00

25 151.48 117.00 91.40 73.60 61.60 56.00 50.50 44.50 43.75 40.00 37.00 36.27 33.35 32.62 32.62 34.90 28.92 28.14 29.70 40.75 27.36 28.14 27.36 27.36

26 31.89 33.35 35.54 37.00 34.08 31.89 31.16 29.70 27.36 25.80 25.02 23.46 22.68 23.46 20.72 20.72 20.72 20.72 20.72 19.54 18.36 20.72 18.36 20.72

27 18.36 18.36 19.54 22.68 20.72 19.54 21.90 19.54 18.36 19.54 18.36 16.00 16.00 18.36 17.18 16.00 15.50 15.50 5.07 26.65 9.54 16.61 16.00 14.50

28 15.50 16.00 17.18 16.00 17.18 17.18 14.91 32.62 16.00 16.00 15.00 15.00 14.50 14.50 14.00 14.00 14.00 15.00 14.50 14.00 14.00 14.00 14.50 13.50

29 12.80 7.86 12.96 17.75 31.16 14.50 13.50 13.50 7.60 14.21 15.56 15.56 14.69 15.56 13.50 12.10 12.10 12.80 12.80 10.70 24.86 10.58 13.50 12.10

30 12.10 12.10 11.40 13.50 12.80 12.80 12.44 20.75 28.92 12.80 11.40 4.74 9.20 29.70 11.40 10.70 11.40 12.80 13.50 31.89 33.35 17.18 18.36 20.72

31 17.18 18.36 20.72 18.36 19.54 18.36 18.36 16.00 15.50 15.00 15.50 14.00 13.50 13.50 14.00 13.50 13.50 13.50 2.76 15.79 22.15 24.40 40.40 45.25

Day

Flow Rate m3/sec

Time in Hours

32

Table 2.1.6 Hourly Flow Data - November 2016Location - On the Mahaweli River Downstream of the Moragolla Hydropower Plant Tail Race and the Confluence with the Atabage Oya

00:00 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00 20:00 21:00 22:00 23:00

1 47.50 48.25 45.25 43.00 40.00 37.75 35.54 34.81 31.89 28.92 28.14 25.02 25.02 25.02 21.90 22.68 21.90 28.14 51.25 44.50 37.75 19.25 35.71 35.54

2 28.92 28.14 27.36 28.14 28.14 27.36 25.80 25.02 23.46 24.24 22.68 19.54 22.68 19.54 17.18 19.54 17.18 19.54 16.00 16.41 28.15 56.00 62.40 50.50

3 51.25 51.25 46.75 44.50 43.75 41.50 38.50 34.81 33.35 29.70 29.70 27.36 27.36 25.80 25.02 24.24 23.46 25.02 21.08 92.04 105.80 80.00 72.00 61.60

4 57.60 52.80 49.00 47.50 47.50 43.75 42.25 40.00 37.75 35.54 34.81 33.35 31.89 30.43 29.70 29.70 31.16 33.35 12.45 44.72 29.48 46.80 48.25 34.81

5 32.62 33.35 31.16 30.43 30.43 28.92 28.14 28.14 28.14 28.92 30.43 32.62 33.35 33.35 31.89 30.43 31.16 30.43 23.40 27.65 31.70 36.06 43.12 28.84

6 28.92 26.58 26.58 25.80 25.80 25.02 25.02 24.24 23.46 25.02 23.46 22.68 23.46 22.68 22.68 21.90 21.90 23.46 11.22 9.40 21.52 25.26 32.08 26.58

7 22.68 18.17 22.09 22.84 18.20 22.48 23.52 24.24 22.68 19.54 19.54 20.72 19.54 17.18 18.36 18.36 16.00 18.36 17.34 15.00 26.40 30.43 18.36 18.36

8 16.00 16.00 16.00 16.00 18.36 16.00 18.04 41.50 15.00 15.50 16.00 15.00 16.00 15.50 15.50 15.00 14.50 15.00 9.42 10.44 12.80 32.00 15.36 18.36

9 19.54 19.54 20.72 18.36 19.54 19.54 16.76 28.92 18.36 16.00 17.18 15.00 16.00 17.18 15.00 17.18 15.50 15.50 15.88 18.00 16.56 18.60 34.40 27.80

10 34.08 32.62 30.43 29.70 26.58 24.24 24.24 20.72 21.90 18.36 18.36 14.10 20.67 16.25 16.31 14.45 14.00 16.31 13.40 20.80 18.45 3.95 20.80 17.75

11 15.50 14.50 15.00 18.36 18.36 15.56 12.00 40.75 18.36 12.14 5.26 24.80 22.25 23.65 14.75 16.24 15.20 15.20 16.08 37.68 16.25 17.81 18.36 16.00

12 18.36 15.50 17.18 15.50 15.00 16.00 13.01 15.26 16.00 15.50 15.00 12.66 14.05 11.80 18.48 14.83 15.00 13.50 13.50 15.16 7.64 19.84 13.40 15.96

13 21.60 18.48 16.00 18.48 19.94 19.56 21.96 24.00 21.40 21.90 17.18 14.50 15.50 15.00 14.50 15.00 14.00 14.50 14.01 10.92 12.00 15.52 38.24 16.00

14 14.00 14.00 13.50 14.00 13.50 13.50 14.00 13.50 14.00 13.50 13.50 14.00 16.00 15.98 15.56 14.50 12.80 10.70 12.80 9.66 12.26 32.62 14.00 15.50

15 15.00 15.50 17.18 18.36 21.90 20.72 13.41 17.51 16.95 12.66 15.20 18.10 17.75 17.02 16.29 14.10 10.13 15.16 6.66 11.76 16.53 14.73 14.50 12.80

16 13.50 15.50 15.00 15.50 15.50 9.66 3.68 25.15 10.99 10.71 13.71 12.55 20.76 13.56 16.60 22.15 13.32 13.27 14.40 16.76 16.29 19.54 12.10 14.00

17 12.80 13.50 12.80 12.10 14.00 5.07 10.01 34.08 12.80 12.80 13.50 7.30 10.30 16.61 12.65 17.34 15.00 15.50 9.92 9.92 41.60 22.44 15.00 17.18

18 18.36 17.18 19.54 17.18 15.00 17.18 15.28 34.90 18.07 15.16 13.47 13.70 12.26 13.24 12.26 12.20 11.45 16.61 17.16 15.20 19.21 28.14 12.80 14.00

19 13.50 14.50 15.50 16.00 20.72 19.54 22.68 28.14 28.14 28.14 26.58 27.36 27.36 26.58 24.24 25.02 24.24 21.90 19.54 20.72 46.00 40.75 31.89 18.36

20 15.00 16.00 17.18 15.50 16.00 16.00 14.50 17.02 24.45 14.83 17.02 16.29 17.02 28.92 13.50 14.50 14.00 13.50 13.70 45.20 46.20 45.24 43.75 14.50

21 13.50 14.00 13.32 14.74 17.02 14.83 11.75 19.54 13.50 14.00 14.50 12.80 14.00 12.10 12.10 13.50 12.10 14.00 13.50 13.47 16.01 14.01 14.50 12.80

22 11.40 13.50 12.80 12.80 1.58 12.15 11.45 10.70 13.50 12.80 11.50 10.27 7.30 16.20 8.97 10.70 14.42 13.28 13.24 15.78 5.37 24.24 30.43 58.40

23 58.40 54.40 45.25 39.25 34.08 28.92 18.55 27.40 23.30 28.49 9.90 15.04 25.43 12.20 7.28 16.28 20.30 19.55 21.12 23.52 16.24 39.60 61.60 44.50

24 35.54 32.62 31.89 29.70 28.92 27.36 18.55 28.15 22.68 20.72 10.71 15.20 17.97 17.51 15.26 15.95 14.97 16.65 17.05 16.60 20.67 18.79 15.00 15.50

25 15.00 14.50 15.00 14.00 14.00 7.08 15.21 17.18 15.00 14.50 15.00 7.41 12.43 9.95 13.18 12.95 13.70 7.41 5.92 8.00 14.80 12.60 8.81 13.50

26 12.80 14.00 13.50 12.80 14.50 13.50 8.91 13.01 14.87 6.63 13.13 9.72 11.45 23.71 9.12 10.71 11.75 11.31 10.65 13.92 21.16 15.68 20.36 20.72

27 13.50 12.10 12.10 12.10 12.10 15.39 11.45 20.35 15.47 11.75 12.45 12.24 19.03 14.01 15.98 16.71 15.15 9.64 13.68 11.00 9.40 12.00 19.31 9.12

28 15.47 17.65 14.01 9.61 14.06 5.48 13.44 18.50 17.02 7.75 12.96 19.64 7.60 19.76 11.50 26.12 16.29 7.76 12.27 13.00 12.08 23.36 15.00 10.70

29 11.40 10.70 11.40 10.70 11.40 10.70 34.08 31.16 31.16 15.00 11.40 10.70 10.00 10.70 10.70 10.00 10.00 10.00 10.70 14.32 15.84 13.91 12.80 10.70

30 10.00 10.00 10.00 10.70 10.70 10.00 9.54 9.90 11.19 10.65 15.00 10.00 10.00 9.30 10.00 10.70 10.70 9.30 11.50 14.16 25.80 10.70 10.00 10.00

Day

Flow Rate m3/sec

Time in Hours

33

Table 2.1.7 Hourly Flow Data - December 2016Location - On the Mahaweli River Downstream of the Moragolla Hydropower Plant Tail Race and the Confluence with the Atabage Oya

00:00 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00 20:00 21:00 22:00 23:00

1 9.30 9.30 9.30 9.30 9.30 10.00 13.30 13.71 12.23 11.40 9.30 8.60 9.30 8.60 9.30 9.30 8.60 9.30 10.00 11.76 9.42 9.68 19.54 10.00

2 8.60 8.60 7.90 7.90 8.60 6.30 3.56 14.40 15.47 15.78 9.63 5.47 7.14 7.45 24.24 11.61 12.23 9.63 9.63 9.88 9.42 8.90 8.60 7.20

3 9.30 7.90 7.90 7.20 8.60 7.90 9.63 16.20 10.00 8.60 7.90 8.90 6.20 28.92 7.20 6.50 7.90 6.50 6.50 6.26 6.20 11.09 19.54 7.20

4 9.30 7.90 7.20 7.20 7.90 7.20 5.51 8.72 8.97 7.35 8.38 9.63 9.22 6.56 8.90 7.34 9.63 11.40 4.23 1.40 17.00 8.36 18.48 8.60

5 7.20 7.90 10.70 8.60 8.60 8.60 7.72 9.55 6.95 35.36 40.88 38.64 40.36 38.60 40.36 39.80 40.08 50.24 11.91 39.00 41.76 40.40 36.16 30.80

6 27.36 12.13 6.30 15.14 5.89 9.22 14.73 18.07 8.90 8.70 12.08 7.36 11.76 11.81 11.09 16.52 20.56 14.84 13.20 53.80 12.76 15.96 14.83 13.28

7 24.24 6.50 6.24 7.90 5.99 6.24 4.43 14.52 13.79 13.28 7.30 3.95 14.00 8.38 25.49 35.76 36.00 34.90 29.36 30.36 32.65 35.20 8.60 5.99

8 5.99 6.50 6.50 6.24 8.60 7.20 7.20 13.32 8.16 13.30 5.15 8.84 23.16 17.64 16.30 13.30 12.55 11.80 11.22 14.72 7.57 17.80 25.44 12.80

9 11.40 10.00 11.40 10.70 11.40 6.62 3.66 10.30 11.51 10.68 9.20 8.51 9.26 7.99 6.95 7.99 8.45 6.20 6.20 7.80 26.24 20.05 11.40 7.20

10 8.60 9.30 8.60 10.00 12.10 1.72 12.66 12.43 14.73 14.94 9.54 1.22 10.59 17.75 10.78 10.58 11.41 11.09 8.39 16.30 17.02 8.60 6.50 7.90

11 7.90 7.20 7.20 8.60 7.20 7.20 7.20 18.48 14.83 12.02 6.31 8.70 10.46 7.03 13.70 11.09 8.49 10.78 17.34 5.20 13.52 12.50 25.80 7.90

12 6.50 6.50 6.50 7.20 7.20 6.24 10.36 11.51 10.72 8.38 5.38 7.03 10.99 10.36 11.19 6.94 9.32 3.70 1.83 8.18 9.30 6.50 6.24 7.20

13 6.24 6.24 5.99 6.24 6.50 6.24 5.99 4.12 7.66 8.81 14.42 9.95 7.34 7.76 15.56 7.76 4.65 8.49 17.75 28.16 5.07 23.65 7.20 6.24

14 5.99 5.99 6.24 5.99 6.24 5.73 10.00 14.32 6.94 7.03 12.64 11.44 6.56 14.12 6.13 5.04 6.00 8.00 25.96 33.56 17.35 28.92 6.50 5.73

15 6.24 5.99 5.99 5.99 6.24 6.50 7.35 13.31 8.81 5.04 6.20 8.08 7.28 10.20 7.80 13.00 9.96 8.96 5.55 9.64 33.40 17.02 11.40 6.50

16 5.99 5.47 5.47 5.73 6.24 7.08 6.25 19.07 24.00 12.55 5.28 5.28 12.40 16.40 7.84 13.93 14.92 5.26 6.80 29.70 26.58 5.99 5.47 5.47

17 5.73 6.24 5.73 5.73 5.47 5.47 6.24 4.43 11.82 8.08 18.48 15.50 9.08 8.76 18.74 9.22 11.92 7.35 7.35 10.20 10.00 15.20 19.54 5.73

18 5.73 5.22 5.22 5.47 5.99 5.73 5.47 5.47 5.73 5.47 5.99 5.47 5.22 4.96 5.22 5.47 5.22 4.96 5.22 5.22 5.22 5.47 5.47 5.47

19 5.22 4.96 5.22 7.90 2.56 5.16 7.34 9.63 5.52 7.12 17.48 6.88 6.08 5.96 21.56 8.08 12.76 12.80 6.00 7.40 15.66 14.83 19.54 5.73

20 5.22 5.99 5.47 5.47 4.96 5.22 4.03 7.76 7.00 3.92 9.96 7.60 10.36 9.44 8.08 13.36 6.80 11.20 12.28 7.56 7.44 9.13 11.40 5.99

21 5.47 5.22 5.47 5.47 5.47 3.00 7.35 9.42 8.64 2.96 14.60 4.60 7.80 8.44 8.56 8.44 13.32 5.48 3.70 9.84 16.76 10.72 16.00 5.73

22 5.22 5.22 5.22 4.96 5.22 5.22 5.22 5.00 7.34 10.36 5.52 5.48 6.21 4.43 9.64 8.64 7.86 7.90 4.96 13.58 24.24 5.99 4.70 4.70

23 4.96 4.70 4.70 5.73 4.96 4.96 6.82 9.30 5.22 5.47 4.96 4.96 4.44 5.22 4.96 4.70 4.44 4.44 4.44 4.44 4.70 5.73 4.96 4.70

24 4.96 4.96 4.70 4.70 5.73 5.22 4.96 4.96 4.96 4.96 5.73 5.22 4.70 4.19 4.19 3.93 4.70 4.44 4.44 3.94 26.58 5.22 4.96 4.44

25 4.70 5.47 4.96 4.70 4.96 4.96 4.70 5.47 4.70 4.70 4.70 4.70 4.44 4.96 4.70 4.19 4.19 4.44 4.70 4.43 6.20 10.98 5.47 4.70

26 4.70 4.70 4.70 4.70 4.96 4.44 5.47 4.96 4.70 4.70 4.44 4.44 4.44 4.70 4.19 3.93 3.93 3.93 4.19 4.02 8.08 4.43 25.02 4.96

27 4.44 4.70 4.44 4.44 5.22 4.70 4.44 4.70 4.70 4.44 4.44 4.44 4.70 3.93 3.79 3.93 3.93 3.79 3.93 5.00 14.50 4.70 4.19 4.19

28 4.19 4.19 4.44 4.19 4.19 4.44 4.70 5.99 4.96 4.70 4.70 4.44 4.96 4.44 3.93 4.19 4.44 5.22 4.70 4.43 4.74 7.34 5.52 7.90

29 5.22 4.96 4.96 4.96 5.22 5.47 5.47 5.22 4.96 4.96 4.96 5.22 5.22 4.96 4.96 4.44 4.44 4.96 4.70 14.42 6.50 4.96 4.70 4.70

30 5.22 5.22 5.22 5.22 4.96 5.22 4.96 5.47 5.22 4.96 4.70 4.70 4.70 4.70 4.44 4.19 4.44 4.19 4.19 9.63 10.46 5.52 14.36 5.22

31 4.70 4.70 4.44 4.70 4.44 4.44 4.44 4.44 4.44 5.22 4.44 4.19 4.19 3.93 3.93 3.93 4.44 4.19 4.19 5.89 5.78 5.16 6.24 5.22

Day

Flow Rate m3/sec

Time in Hours

34

Table 2.1.8 Hourly Flow Data - January 2017Location - On the Mahaweli River Downstream of the Moragolla Hydropower Plant Tail Race and the Confluence with the Atabage Oya

00:00 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00 20:00 21:00 22:00 23:00

1 4.19 4.19 4.19 3.93 4.19 4.19 4.19 4.96 4.70 4.44 3.93 3.93 3.79 3.64 3.93 3.93 3.79 3.64 3.79 5.15 6.04 6.50 4.19 4.44

2 4.70 4.44 3.93 4.19 4.19 3.93 4.19 4.19 4.70 4.19 3.93 3.93 3.79 3.79 3.79 4.44 3.93 3.79 3.79 5.52 7.08 5.00 8.64 21.90

3 4.70 4.19 3.93 3.93 4.96 4.19 3.93 4.19 3.79 3.93 3.93 3.93 4.19 4.19 3.93 3.79 2.66 9.42 5.26 7.03 8.12 8.64 7.86 8.12

4 25.80 5.26 9.42 5.12 5.52 4.22 8.05 7.08 3.94 5.16 7.41 4.48 7.08 2.40 6.82 7.08 8.38 7.08 10.20 14.83 5.73 4.44 3.93 3.79

5 3.79 3.93 3.93 3.79 3.79 3.93 3.79 4.70 4.19 3.93 3.93 3.79 3.64 3.50 3.50 3.93 3.64 3.64 3.64 5.00 5.78 12.28 7.90 3.93

6 4.44 3.93 3.79 3.79 3.64 3.79 3.79 3.79 3.79 3.79 4.44 3.79 3.64 3.50 3.36 3.64 3.64 18.36 17.02 12.40 11.34 10.70 3.93 3.79

7 3.79 3.79 3.64 3.79 4.44 4.19 3.64 3.79 3.79 3.79 3.93 3.79 3.64 3.79 3.50 3.50 3.36 3.22 3.50 2.92 6.30 6.30 4.70 4.19

8 3.64 3.36 3.64 3.64 3.64 3.64 3.64 3.64 3.79 3.93 3.79 3.50 3.50 3.36 3.36 3.22 3.22 3.50 3.79 3.94 5.26 6.56 7.86 5.73

9 3.79 3.50 3.50 3.64 3.64 4.44 3.79 3.79 3.79 3.79 3.79 3.79 3.50 3.50 3.64 3.36 3.36 3.22 1.58 4.44 13.28 10.70 3.79 3.64

10 3.50 4.19 3.79 3.50 3.64 3.64 3.64 3.50 3.50 3.64 3.64 3.64 3.50 3.36 3.22 3.94 2.66 6.82 6.82 7.35 11.10 24.40 20.72 20.72

11 27.36 20.72 18.36 27.36 26.58 27.36 10.98 5.78 3.18 4.74 6.04 4.74 5.52 5.78 3.70 5.26 4.12 6.30 6.30 7.34 6.30 8.64 8.64 8.20

12 23.46 8.12 3.18 4.74 4.48 5.26 5.26 5.52 4.70 3.50 3.93 3.64 3.36 3.22 3.07 3.07 3.07 3.07 1.70 6.04 5.26 9.42 5.99 3.64

13 3.50 3.36 3.22 3.50 3.36 3.36 3.36 3.36 3.36 3.36 3.36 3.36 3.64 3.36 3.22 3.07 2.93 3.07 3.22 3.44 5.52 6.30 7.20 4.70

14 3.50 3.79 3.50 3.36 3.36 3.36 3.50 3.50 3.50 3.36 3.50 3.22 3.22 3.07 3.50 3.22 3.22 3.07 2.93 3.18 3.96 5.52 2.76 5.73

15 3.36 3.36 3.22 3.36 3.79 3.50 3.36 3.36 3.36 3.36 3.36 3.22 3.22 3.22 2.93 2.93 2.93 3.50 3.22 4.74 3.70 3.96 4.74 4.70

16 3.36 3.22 3.07 3.22 3.22 3.22 3.18 3.56 3.70 5.00 3.72 4.80 6.95 6.56 2.76 3.00 5.52 5.52 3.96 3.96 3.00 6.54 4.18 2.50

17 5.36 4.74 3.94 3.00 5.26 5.26 4.74 4.18 2.76 5.60 3.70 5.26 5.36 6.04 5.52 4.22 3.18 2.90 3.70 4.22 6.30 6.30 3.94 5.52

18 5.60 4.82 5.52 5.00 5.78 4.74 4.22 2.76 2.92 4.48 4.48 3.96 4.48 3.44 1.88 2.66 5.52 2.66 2.18 2.18 5.12 4.48 3.18 2.40

19 5.52 3.96 3.18 3.96 4.22 1.62 3.96 2.76 3.96 7.20 3.44 5.26 5.30 6.30 2.76 3.18 4.48 7.86 6.56 4.56 5.52 5.36 5.78 6.30

20 26.58 3.00 2.66 2.66 2.38 5.00 5.26 3.18 3.18 3.18 2.76 3.44 4.74 3.96 2.76 2.40 4.22 3.44 5.00 2.92 2.92 3.94 3.00 4.44

21 3.36 3.22 3.50 3.36 3.79 3.64 3.36 3.22 3.07 2.93 2.93 3.50 3.07 2.93 2.93 2.93 2.93 2.93 3.07 3.00 1.62 2.76 3.00 4.18

22 3.79 3.36 3.22 3.36 3.36 3.22 3.36 3.50 3.50 3.22 3.22 3.07 3.07 3.07 3.07 3.07 2.93 3.07 3.36 3.18 3.96 5.52 4.96 3.36

23 3.22 3.22 3.22 3.36 3.79 3.50 3.36 3.36 3.22 3.36 3.36 3.22 3.22 3.36 3.64 3.50 3.96 3.92 3.70 3.18 3.00 3.00 2.38 8.60

24 3.79 3.50 4.44 3.93 3.79 4.19 4.44 4.44 4.19 4.19 3.93 4.19 4.19 3.93 3.93 3.93 3.93 3.93 4.44 4.85 5.89 4.70 4.96 5.73

25 5.99 6.24 7.20 9.30 9.30 8.60 7.20 7.20 7.20 6.24 7.20 5.99 5.47 4.96 4.96 5.47 4.70 4.19 4.44 4.19 4.96 3.93 3.93 4.19

26 4.44 4.70 3.93 4.19 4.19 3.93 3.93 4.44 4.19 3.93 3.93 3.79 3.79 4.19 3.93 3.79 3.64 3.79 4.44 4.19 4.70 4.96 4.96 4.10

27 5.00 5.12 9.30 3.93 4.19 4.70 3.61 3.00 5.22 4.96 4.44 4.96 5.99 4.96 5.22 4.96 4.44 5.99 7.08 3.70 14.42 13.32 11.76 5.99

28 5.47 5.99 5.47 5.47 5.47 5.47 6.24 5.73 5.47 5.47 5.47 5.22 5.47 4.96 5.22 4.70 4.96 5.47 5.22 4.43 7.08 7.20 5.73 5.22

29 5.22 5.22 4.96 5.73 4.96 5.22 4.96 4.96 5.73 4.96 4.96 4.44 4.44 4.70 4.19 4.19 4.19 4.19 4.96 11.40 8.12 6.56 3.44 8.60

30 5.73 4.96 4.96 4.70 4.44 4.44 4.44 5.47 4.70 4.70 4.70 4.44 4.70 4.44 4.44 4.44 4.19 4.19 4.19 4.43 7.76 15.00 4.96 4.70

31 4.19 4.44 4.44 4.96 4.96 4.96 4.70 4.44 4.70 4.70 5.22 4.96 4.70 4.44 3.93 3.93 3.93 3.93 3.79 14.10 12.54 9.16 20.72 4.96

Day

Flow Rate m3/sec

Time in Hours

35

Table 2.1.9 Hourly Flow Data - February 2017Location - On the Mahaweli River Downstream of the Moragolla Hydropower Plant Tail Race and the Confluence with the Atabage Oya

00:00 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00 20:00 21:00 22:00 23:00

1 4.44 4.44 4.44 4.70 4.96 4.96 4.96 4.70 4.44 5.22 4.96 4.96 4.70 4.44 3.93 3.79 4.19 3.79 3.64 5.16 3.70 12.54 7.20 4.70

2 4.70 4.70 4.44 4.44 4.19 4.96 4.70 4.70 4.44 4.44 4.44 3.93 3.79 4.70 4.44 3.79 3.79 4.19 4.19 4.60 7.03 4.22 20.67 3.96

3 36.27 7.20 5.47 5.22 5.22 4.96 4.70 4.70 4.96 5.22 4.96 4.70 4.44 4.19 3.93 3.93 3.79 4.19 4.44 10.26 16.29 15.00 5.47 4.96

4 4.96 4.96 4.70 4.70 4.70 4.44 4.70 4.96 4.70 5.73 5.22 5.22 4.96 4.70 4.44 3.93 4.19 3.93 3.93 3.43 12.00 5.44 8.60 10.98

5 5.99 4.96 4.96 4.96 4.96 4.96 4.96 4.96 5.47 4.22 8.12 6.50 4.70 3.93 3.64 3.64 3.64 3.64 2.76 5.16 11.76 9.63 23.46 5.47

6 4.96 4.70 4.70 4.44 4.44 4.44 4.70 4.96 4.96 4.70 4.70 4.48 6.83 8.64 8.64 5.80 5.79 9.09 10.36 12.24 16.29 15.25 7.20 4.96

7 4.70 4.19 4.19 3.93 3.93 3.93 3.93 12.80 11.09 11.09 9.95 11.09 11.82 9.42 8.64 7.86 7.86 7.86 7.86 2.92 15.56 3.96 12.28 15.00

8 4.96 4.70 4.70 4.44 4.44 4.70 2.66 7.86 8.64 25.80 4.96 4.70 3.93 3.79 3.50 3.36 3.22 3.36 3.50 15.14 12.54 7.34 5.99 4.70

9 4.44 5.22 4.44 4.44 4.19 5.73 6.31 7.08 15.56 7.08 10.00 4.44 4.44 3.79 3.79 3.64 3.64 3.93 3.50 5.89 7.34 8.49 7.67 6.66

10 6.21 6.24 4.44 4.44 4.19 4.19 9.42 11.76 6.56 5.78 6.30 7.08 16.20 15.00 4.19 3.79 3.64 3.64 3.79 3.44 3.44 5.52 8.60 5.22

11 4.19 3.93 3.64 3.50 3.50 3.64 3.64 3.64 3.79 3.93 4.19 4.19 3.79 3.64 3.64 3.93 3.36 3.50 3.36 3.70 12.02 14.00 4.44 3.93

12 3.79 3.79 3.79 3.79 3.79 3.79 3.79 3.79 3.79 3.93 4.19 3.93 3.50 3.50 3.22 3.22 3.22 3.36 3.36 4.43 3.18 3.70 3.70 4.44

13 3.79 3.79 3.79 3.79 4.19 4.19 3.93 3.93 3.70 3.96 5.16 7.35 3.96 3.50 5.00 4.43 4.74 5.52 5.52 3.96 5.22 4.19 3.79 3.79

14 3.64 3.50 3.50 3.50 3.50 3.36 3.64 3.64 3.64 3.96 13.90 15.46 5.78 11.24 6.30 7.08 6.30 8.60 7.86 6.56 9.63 9.16 12.10 4.70

15 4.19 4.19 4.19 4.19 4.70 4.96 4.44 6.30 8.59 13.32 6.31 4.43 5.16 5.50 6.01 8.20 7.35 4.84 3.94 6.62 4.60 4.96 4.19 3.79

16 3.93 3.93 4.19 4.19 3.93 4.19 4.19 2.40 8.12 10.98 5.12 5.12 6.30 3.70 3.93 3.64 3.50 3.36 3.50 6.56 7.08 6.04 12.10 4.96

17 4.19 3.79 3.64 3.64 3.64 3.64 4.18 6.30 4.44 3.79 2.76 4.02 3.61 5.00 6.50 4.44 3.93 2.92 7.08 14.83 6.56 10.00 4.19 3.64

18 3.50 3.50 4.22 4.75 3.80 4.40 6.93 3.18 3.96 4.74 5.78 3.04 6.56 4.44 3.64 3.50 3.50 3.36 3.22 3.22 3.22 3.22 3.22 3.22

19 3.36 3.50 3.36 4.19 3.64 3.79 3.64 3.61 3.18 4.70 3.93 2.76 4.22 5.78 7.86 6.30 5.22 3.93 4.96 7.03 5.78 4.74 5.22 4.44

20 4.19 4.70 4.19 3.93 3.93 3.93 2.76 3.70 4.44 4.96 4.44 3.93 3.93 3.79 3.79 3.64 3.79 3.93 3.79 3.79 4.19 4.19 4.19 3.93

21 3.79 3.79 3.79 3.93 3.93 4.44 4.19 3.93 4.44 4.19 5.78 4.22 6.56 4.70 3.79 3.50 3.36 3.22 3.22 5.00 8.12 3.44 4.96 3.93

22 3.79 3.79 3.64 3.64 3.50 3.50 3.50 3.50 4.22 5.78 5.52 9.30 4.44 3.93 3.50 3.36 3.36 3.22 3.22 3.18 3.39 3.96 4.70 3.79

23 3.93 3.64 3.64 3.64 3.50 3.50 3.93 5.26 3.18 2.15 5.45 5.78 6.56 4.96 3.79 3.50 3.22 3.07 3.07 3.96 5.12 7.20 3.79 3.79

24 3.64 3.36 3.50 3.50 3.64 3.64 3.64 3.50 3.50 3.50 3.36 3.22 3.22 2.93 2.79 2.93 2.79 3.07 3.22 3.18 3.18 4.22 3.18 4.44

25 3.79 3.36 3.36 3.22 3.22 3.22 3.36 3.50 3.64 3.50 3.50 3.36 3.36 3.22 3.22 3.22 3.36 3.07 3.07 5.00 5.78 5.00 5.47 3.79

26 3.50 3.50 3.50 3.36 3.36 3.36 3.22 3.07 3.22 3.22 3.22 3.22 3.64 3.50 3.64 3.50 3.36 3.36 3.79 2.40 4.74 5.78 3.70 4.10

27 4.19 3.64 3.64 3.64 3.79 3.64 6.78 6.04 7.86 3.96 5.12 5.47 3.64 3.50 3.36 3.36 3.36 3.64 2.76 3.18 4.22 4.48 6.82 5.52

28 4.70 3.79 3.50 3.50 3.36 3.36 3.36 3.64 3.64 4.44 3.79 3.64 5.12 5.00 5.16 5.78 5.52 6.30 3.44 4.74 3.18 4.74 4.96 4.19

Day

Flow Rate m3/sec

Time in Hours

36

Annexure 2

Letter received from Mr. Prashan De Silva

37

38