MEDSTAT II Environment Sector / UNESCWA / UNSD

05.04.2004 | Slide 1

MEDSTAT II Environment Sector / UNESCWA / UNSD, Amman 10-13 March 2008

Links, communalities and differences between SEEAW and Eurostat/OECD-JQ

and UNSD Water Questionnaire

MEDSTAT II Environment Sector / UNESCWA / UNSD

Joint Sub-regional Training Session on the System of Environmental-Economic Accounting for Water

(SEEAW)

Amman, March 10-13, 2008

Michael Nagy

05.04.2004 | Slide 2


Table of contents

History of environment/water statistics Overview on statistical tables:

UNSD-Water Questionnaire 2006 Eurostat/OECD Joint Questionnaire on Inland Waters SEEAW Standard Tables and Supplementary Tables

Links and communalities between the 3 questionnaires – in the order of UNSD-WQ tables

Conclusions

05.04.2004 | Slide 3


History of environment/water statistics

Early 1970s: Environment statistics compiled in some countries (regulatory and administrative purposes)

1980s: OECD started data collection through questionnaires

1990s: Environmental-Economic Accounting started

1993: SEEA SEEA 2003 (revised version) 2007: SEEAW as interim standard

05.04.2004 | Slide 4


UNSD-Water Questionnaire: Tables

Table W1

Table W2

Table W3

Table W4

Table W5

Table W6

Table W7

Table W8 Supplementary Information Sheet

Wastewater Treatment Facilities

Water Supply Industry (ISIC 41)

Total Water Use

Population connected to Wastewater Treatment

Water Use Balance

Freshwater Abstraction

Renewable freshwater Resources

05.04.2004 | Slide 5


Eurostat/OECD-JQ IW: Tables

ö Fresh water Resources1_notes Fresh water Resources - Explanatary notes

(inflow) 1a_IF Actual external inflow from neighbouring territories(outflow) 1a_OF Actual outflow to neighbouring territories

Scheme 1 Simplified hydrological cycle2.1 Annual water abstraction by source2.2 Other sources of water

2_notes Annual water abstraction by source and Other sources of water - Explanatary notes3.1 Water use by supply category3.2 Water use by industrial activity

Scheme 2 Freshwater flowsSummary table Water use balance

4 National population connected to waste water treatment plants4_notes National population connected to waste water treatment plants - Explanatary notes

5 Treatment capacity of waste water treatment plants in terms of BOD5_notes Treatment capacity of waste water treatment plants in terms of BOD - Explanatary notes

6 Sewage sludge production and disposal6_notes Sewage sludge production and disposal - Explanatary notes

7 Generation and discharge of waste water7_notes Generation and discharge of waste water - Explanatary notes

Scheme 3

05.04.2004 | Slide 6


SEEAW Tables

Standard Tables: Standard physical supply and use tables (PSUT) Emission accounts Hybrid supply and use tables Asset accounts

Supplementary tables: PSUT: breakdown of use-types and returns (e.g. mining water,

irrigation water, cooling water,…) Flows of water within the economy Emission accounts: Emission breakdown to surfacewater /

groundwaters; amounts of sludge Quality accounts Social indicators: e.g. sustainable access to improved water

sources

05.04.2004 | Slide 7


UNSD-WQ: W1 – Renewable Freshwater Resources

Line Category Unit

1 Precipitation mio m3/y

2 Actual evapotranspiration mio m3/y

3 Internal flow (=1-2) mio m3/y

4 Inflow of surface and groundwaters mio m3/y

5 Renewable freshwater resources (=3+4) mio m3/y

6 Outflow of surface and groundwaters mio m3/y

7Regular freshwater resources 95% of the time mio m3/y

05.04.2004 | Slide 8


Hydrological Cycle (Eurostat / OECD)

Other territories/autres territoires

IF

Precipitation

Û P

E

Evapo-transpiration

Internal Flow/flux interne(surface & groundwater/ eauxde surface et souterraines)

Other territories/autres territoires

External inflow/apports externes

EI

EI-SW

Groundwater

eaux souterraines EI- GW

Surface water/eaux de surface


Groundwater/eaux souterraines

Os-GW Os-SW

Ot-SW

Groundwater

eaux souterraines Ot-GW

to other territories/vers d’autres territoires Ot

Outflow/évacuation

O


Sea/mer

+

-

++

into the sea/dans la mer

Os

-

Rivers/eaux courantes

05.04.2004 | Slide 9


UNSD-WQ: W1 – Renewable Freshwater Resources

Corresponds to Eurostat/OECD-JQ T1 – Freshwater resources +/- identical variables slightly different terminology, e.g.:

Inflow of surface and groundwaters (UNSD) Actual external inflow (Eurostat/OECD)

Outflow of surface and groundwaters (UNSD) Total actual outflow (Eurostat/OECD)

UNSD-WQ: less variables Eurostat/OECD: Supplementary tables on inflow and outflow

Link to SEEAW-Table: asset accounts Increases in stocks can be taken from W1 (or T1): Precipitation,

Inflows Decreases in stocks can be taken from W1 (or T1): Outflow, Actual

evapotranspiration Water abstraction can be taken from UNSD-WQ W2 (Net water

abstraction) UNSD and Eurostat/OECD deal with renewable water resources

only, no stocks

05.04.2004 | Slide 10


UNSD-WQ: W2 – Water Use Balance

Line Category Unit

1 Gross freshwater abstracted (=W3,1) mio m3/y

2 Water returned without use mio m3/y

3 Net freshwater abstracted (=1-2) mio m3/y

4 Desalinated water mio m3/y

5 Reused water mio m3/y

6 Imports of water mio m3/y

7 Exports of water mio m3/y

8Total freshwater made available for use (=3+4+5+6-7) mio m3/y

9 Leakage during transport (=W4,4) mio m3/y

10 Wastewater generated (=11+12+13) mio m3/y

11 of which: Discharged to inland water bodies mio m3/y

12 Discharged to marine water bodies mio m3/y

13 Reused water (=5) mio m3/y

14 Consumptive water use (=8-9-10) mio m3/y

15 Water consumption (=14+12) mio m3/y

05.04.2004 | Slide 11



Ex

Freshwater Flows Im +DsW

WWI

RuW

A

CWI

CW

Freshwater Resource

L RW

C

A

Le

WAU = A - RW - Ex + RuW + Im + DsW

WW

CWM

WWM

Water flow schema of Eurostat/OECD-JQ on Inland Waters

A Abstraction

C Consumptive water use

CW Cooling water

CWI Cooling water discharged to Inland waters

CWM Cooling water discharged to Marine waters

DsW Desalinated Water

Ex Exports

Im Imports

L Losses by leakage

Le Losses by evaporation

RuW Reused water

Rw Returned water

S Supply

WAU Total water available for use within the territory

WW Waste water generated

WWI Waste water discharged to Inland waters

WWM Waste water discharged to Marine waters

05.04.2004 | Slide 12



Corresponds to Eurostat/OECD-JQ T Water Use Balance Identical concept:

Consumptive water use = Freshwater abstraction – leakages – wastewater generation

Water consumption = Consumptive water use + Discharges to the sea

Links to SEEAW PSUT (Columns „Total use“, „Total supply“) No disaggregation for different industries in W2 UNSD-WQ data can be used to compile total abstraction and total

returns slightly different concept regarding re-used water Main difference:Water used for hydropower is NOT COVERED by

UNSD/Eurostat/OECD – Water Questionnaires

05.04.2004 | Slide 13


UNSD-WQ: W3 – Freshwater abstraction

1 Gross freshwater abstracted (=11+21) (=2+3+4+5+6+7+8) mio m3/y

2 Water abstraction by water supply industry (ISIC 41) (=12+22) mio m3/y

Direct abstraction by:

3 Households (=13+23) mio m3/y

4 Agriculture, forestry and fishing (ISIC 01-05) (=14+24) mio m3/y

6 Manufacturing industries (ISIC 15-37) (15+25) mio m3/y

7 Electricity industry (ISIC 40) (16+26) mio m3/y

8 Other economic activities (=17+27) mio m3/y

+ disaggregation of same variables for surface water and groundwater

05.04.2004 | Slide 14


UNSD-WQ: W3 – Freshwater abstraction

Corresponds to Eurostat/OECD-JQ T2 Annual freshwater abstraction by source Same structure and variables Eurostat/OECD has additional variables:

Breakdown of cooling water of manufacturing industry Supplementary table: Other sources of water

Links to SEEAW physical use table: Similar breakdown into industries and households UNSD-WQ data can be used to complete part „Abstraction

from the environment“

05.04.2004 | Slide 15


UNSD-WQ: W4 – Water supply industry (ISIC 41 ISIC 36)

Line Category Unit

1Gross freshwater delivered by water supply industry (ISIC 41)

mio m3/y

2 Freshwater losses during transport mio m3/y

3 of which: Losses by evaporation mio m3/y

4 Losses by leakage mio m3/y

5Net freshwater delivered by water supply industry (ISIC 41) (=1-2) (=6+7+8+9+10)

mio m3/y

of which delivered to:

6 Households mio m3/y

7 Agriculture, forestry and fishing (ISIC 01-05) mio m3/y

8 Manufacturing (ISIC 15-37) mio m3/y

9 Electricity industry (ISIC 40) mio m3/y

10 Other economic activities mio m3/y

Population supplied by water supply industry (ISIC 41)

11 Population supplied by water supply industry (ISIC 41) %

05.04.2004 | Slide 16


UNSD-WQ: W4 – Water supply industry (ISIC 41 ISIC 36)

Corresponds to Eurostat/OECD-JQ T 3.1 - Water use by supply category, part „Public water supply“ and „Losses during transport“: Eurostat/OECD-JQ has breakdown for cooling water of

manufacturing industries

Links to SEEAW PSUT: Use data to compile figures for „Use of water received

from other economic units“ Note: Flows within ISIC 41 (36) are not covered by

UNSD/Eurostat/OECD Link to SEEAW social indicators:

Consider data on „Population supplied“ in the compilation of „sustainable access to an improved water source“

05.04.2004 | Slide 17


UNSD-WQ: W5 – Total water use

Line Category Unit

1 Freshwater use, total (=2+3+5+6+7) mio m3/y

of which used by:

2 Households mio m3/y

3Agriculture, forestry and fishing (ISIC 01-05) mio m3/y

4 of which for irrigation in agriculture mio m3/y

5 Manufacturing (ISIC 15-37) mio m3/y

6 Electricity industry (ISIC 40) mio m3/y

7 Other economic activities mio m3/y

05.04.2004 | Slide 18


UNSD-WQ: W5 – Total water use

No directly corresponding table in Eurostat/OECD-JQ: Self supply (T3.1) ≈ Total water use (W5) - Freshwater

abstraction (W3) Eurostat/OECD-JQ has a breakdown for cooling water of

manufacturing industries

Link to SEEAW PSUT: Equal to total use of water per industry (use table) Note: Flows within same industries are not covered by

UNSD/Eurostat/OECD

05.04.2004 | Slide 19


UNSD-WQ: W6 – Wastewater treatment facilities

Line Category Unit

Primary urban wastewater treatment

1 Number of plants Number

2 Design capacity (Volume) 1000 m3/d

3 Design capacity (BOD) 1000 kg O2/d

4 Actual occupation (Volume) 1000 m3/d

5 Actual occupation (BOD) 1000 kg O2/d

Secondary urban wastewater treatment

6 Number of plants Number

7 Design capacity (Volume) 1000 m3/d

8 Design capacity (BOD) 1000 kg O2/d

9 Actual occupation (Volume) 1000 m3/d


Independent wastewater treatment


Sewage sludge production

12 Sewage sludge production (dry matter) 1000 t

05.04.2004 | Slide 20


UNSD-WQ: W6 – Wastewater treatment facilities

Corresponds to: Eurostat/OECD-JQ T 5 – Treatment capacity of

wastewater treatment plants in terms of BOD Eurostat/OECD-JQ T 6 – Sewage sludge production and

disposal Differences:

UNSD-WQ: effluent BOD is missing Eurostat/OECD-JQ additionally: tertiary treatment, more

about independent treatment (e.g. capacity and effluent BOD), concept of „Other wastewater treatment“, sludge disposal routes

1 link to SEEAW tables: Sewage sludge quantity

05.04.2004 | Slide 21


UNSD-WQ: W7 – Population connected to wastewater treatment

Line Category Unit

1Population connected to urban wastewater collecting system

% of pop.

2Population connected to urban wastewater treatment

% of pop.

3of which at least secondary treatment

% of pop.

4Population with independent wastewater treatment (eg septic tanks)

% of pop.

5 of which at least secondary treatment % of pop.

6Population not connected to wastewater treatment (100% - (2) - (4))

% of pop.

05.04.2004 | Slide 22


UNSD-WQ: W7 – Population connected to wastewater treatment

Corresponds to Eurostat/OECD-JQ T4 – National population connected to wastewater treatment plants. JQ more detailled: Tertiary treatment Other wastewater treatment

Link to SEEAW: Data should be considered in the calculation of

„access to improved sanitation“

05.04.2004 | Slide 23


Eurostat/OECD-JQ Table 7: Generation and discharge of waste water

PO IN T SO U RC ES :

A gr icultur e

NO N -P OIN T S OU R C ES:

• R un -of f r a in water• Ag r icu ltu re• Atm osp h eric d ep os ition

W W 6.3

W W 4.1

W W 5.2 .2

W W 7 .1

W W 4.2 .2

W W 6W W 6.1

W W 5.2 .1

UWWTP

W W 4.2 .1

W W 7.2

D rain age fro m s oils , d irect tr ans fer s e tc .

W W 5.2

W W 4.2

W W 5.1

W W 7

Urb a n W as te W a ter Co llectingSy stem

Inland

Water

R ainw ater ru n -o ff f ro m pav ed ar ea , inf iltr a tio n and d rain ag e intoco llectin g s ystem

In d us tr ia l Activities •M in ing an d q uar ryin g•M anu factu rin g In d ustry•Prod ./D is tr . E lectr ic ity•Co n stru ctio n

D om estic Sector•Oth er activ ities•H o useh olds

IWWP

Independenttrea tmen t

In depen den t W as te W a ter C ollectingSy stem

S OU RC ES C OL LEC TIN G S YS TEM S TR EA TM E NTS R EC EIV IN G W AT ER S

W W _4

W W _5

SLU D GE S

W W 6.2

PO IN T SO U RC ES :

A gr icultur e

NO N -P OIN T S OU R C ES:

• R un -of f r a in water• Ag r icu ltu re• Atm osp h eric d ep os ition

W W 6.3

W W 4.1

W W 5.2 .2

W W 7 .1

W W 4.2 .2

W W 6W W 6.1

W W 5.2 .1

UWWTP

W W 4.2 .1

W W 7.2

D rain age fro m s oils , d irect tr ans fer s e tc .

W W 5.2

W W 4.2

W W 5.1

W W 7

Urb a n W as te W a ter Co llectingSy stem

Inland

Water

R ainw ater ru n -o ff f ro m pav ed ar ea , inf iltr a tio n and d rain ag e intoco llectin g s ystem

In d us tr ia l Activities •M in ing an d q uar ryin g•M anu factu rin g In d ustry•Prod ./D is tr . E lectr ic ity•Co n stru ctio n

D om estic Sector•Oth er activ ities•H o useh olds

IWWP

Independenttrea tmen t

In depen den t W as te W a ter C ollectingSy stem

S OU RC ES C OL LEC TIN G S YS TEM S TR EA TM E NTS R EC EIV IN G W AT ER S

W W _4

W W _5

SLU D GE S

W W 6.2

05.04.2004 | Slide 24


Eurostat/OECD-JQ Table 7: Generation and discharge of waste water

Covers all wastewater flows from generation to discharge per type of industry

Parameters: Volume BOD N P Suspended solids Heavy Metals

No corresponding UNSD-WQ table Can be used as basis for calculation of SEEAW

Emission Accounts

05.04.2004 | Slide 25


CONCLUSIONS I

UNSD-WQ and Eurostat/OECD-JQ use identical concepts: Can be used complementary to provide a global picture Eurostat/OECD-JQ is more disaggregated Eurostat/OECD-JQ deals additionally with industrial wastewater

and non-point sources Eurostat/OECD-JQ deals additionally with WW quality aspects Some terms are slightly different Main difference: UNSD Definition of wastewater includes

cooling water whereas Eurostat/OECD-JQ excludes cooling water from its wastewater definition

05.04.2004 | Slide 26


CONCLUSIONS II

UNSD-WQ/Eurostat/OECD-JQ versus SEEAW: SEEAW follows strictly ISIC classification;

UNSD-WQ/Eurostat/OECD-JQ relate more to ownership (e.g. public water supply, urban wastewater treatment)

Concept „total supply“ in SEEAW is different from „supply“ in UNSD-WQ/Eurostat/OECD-JQ

SEEAW includes the use of water in hydroelectric power generation

SEEAW concept of „soil water“ does not exist in the other questionnaires

No economic information in UNSD-WQ/Eurostat/OECD-JQ

05.04.2004 | Slide 27


Conclusions III

UNSD-WQ and Eurostat/OECD-JQ are an important data basis for compilation of SEEAW

Data have to be used carefully, since not all definitions and concepts are harmonized yet

Questionnaires are currently brought in line (step by step): Terminology Definitions Concepts and classifications

05.04.2004 | Slide 28


Thank you very much for your attention!

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MEDSTAT II Environment Sector / UNESCWA / UNSD