Neelum JehlumHYDROPOWER PROJECT

Presented ByMUHAMMAD

AQEEL

Why we build A DAM The concept of a dam and its potential benefits, which include water supply, electricity generation, flood control, recreation and irrigation. A barrier constructed to hold back water and raise its level, forming a reservoir used to generate electricity or as a water supply.

purpose of dam Therefore, dams are constructed for a specific purpose such as water supply, flood control, irrigation, navigation, sedimentation control, and hydropower. A dam is the cornerstone in the development and management of water resources development of a river basin.

Advantages 1. Once a dam is constructed, electricity can be produced at a constant rate.

2. If electricity is not needed, the sluice gates can be shut, stopping electricity generation. The water can be saved for use another time when electricity demand is high.

3. Dams are designed to last many decades and so can contribute to the generation of electricity for many years / decades.

4. The lake that forms behind the dam can be used for water sports and leisure / pleasure activities. Often large dams become tourist attractions in their own right.

5. The lake's water can be used for irrigation purposes.

6. The build up of water in the lake means that energy can be stored until needed, when the water is released to produce electricity.

7. When in use, electricity produced by dam systems do not produce green house gases. They do not pollute the atmosphere

Disadvantages 1. Dams are extremely expensive to build and must be built to a very high standard.

2. The high cost of dam construction means that they must operate for many decades to become profitable.

3. The flooding of large areas of land means that the natural environment is destroyed.

4. People living in villages and towns that are in the valley to be flooded, must move out. This means that they lose their farms and businesses. In some countries, people are forcibly removed so that hydro-power schemes can go ahead.

5. The building of large dams can cause serious geological damage. For example, the building of the Hoover Dam in the USA triggered a number of earth quakes and has depressed the earths surface at its location.

6. Although modern planning and design of dams is good, in the past old dams have been known to be breached (the dam gives under the weight of water in the lake). This has led to deaths and flooding.

7. Dams built blocking the progress of a river in one country usually means that the water supply from the same river in the following country is out of their control. This can lead to serious problems between neighbouring countries.

8. Building a large dam alters the natural water table level. For example, the building of the Aswan Dam in Egypt has altered the level of the water table. This is slowly leading to damage of many of its ancient monuments as salts and destructive minerals are deposited in the stone work from rising damp caused by the changing water table level

About Neelum Jehlum hydrop project

A composite Dam (Gravity + Rock fill) 160m long and 60m high will be constructed on Neelum River at Nauseri. It is a Gated Diversion Dam.

The dam will create a head pond of 10 million cubic meters which will allow a peaking reservoir (A natural or artificial pond or lake used for the storage and regulation of water)of 3.8 million cubic meters to meet daily peaking of power for more than 4 hours.

A six gate tunnel intake structure of 280 cumecs (a unit of flow equal to one cubic meter of water per second) capacity will be connected three conventional flushing surface basins installed at their end for taking sediment back into river.

The total length of headrace tunnel is almost 48 Km. A 19.54 Km stretch of the tunnel from the Nauseri site will be constructed as a twin tunnel system each with cross sectional area ranging from 52-58m2.

The remaining headrace tunnel down to the surge chamber will be a single tunnel having cross sectional area 100m2 approximately.

The remaining headrace tunnel down to the surge chamber will be a single tunnel having cross sectional area 100m2 approximately.

The tunnel portion to be excavated with TBM will be shortcrete lined with a concrete invert while the drill and blast portion of the tunnel will have full face concrete lining.

The tunnel crosses under the Jhelum River at EI. 602.0, m asl, approximately 180m below Riverbed.

The tunnel is accessed by 8 construction Adits(a horizontal passage leading into a mine for the purposes of access or drainage) for removal of excavated spoil.

The Surge Chamber consist of 341m high riser shaft and 820m long surge tunnel, four steel lined Penstock tunnels 118 m long and having 3.8 m internal diameter will also be constructed.

The underground power Station will have four units with a total capacity of 969 MW. The Power Station will be connected with Gakhar Grid station through 500KV double circuit transmission line.

63%Worked

LocationNeelum Jhelum Hydroelectric Project (NJHEP) is located in the vicinity Muzaffarabad (AJ&K). It envisages the diversion of Neelum river water through a tunnel out -falling into Jhelum River. The intake Neelum Jhelum is at Nauseri 41 Km East of Muzaffarabad. The Powerhouse will be constructed at Chatter Kalas, 22 Km South of Muzaffarabad. After passing through the turbines the water will be released into Jhelum River about 4 Km South of Chatter Kalas. Neelum Jhelum Hydroelectric Project has installed capacity of 969 MW. The Project will produce 5.15 Billion units of electricity annually

Project Key Data • Installed capacity : 5x211Mw

• Annual generation : 5254 GWh

• Maximum gross head : 420 m

• Maximum discharge : 280 m3/s

• Concrete intake weir height : 42 m

• Catchment area : 6682 km2

• Mean flow at intake site : 335 m3/s

• PMF - 14 000 - 16 000 m3/s

• Reservoir volume : 8.0 Mm3

Funding:

NORAD/Mixed Credit

Value of Services:

USD 10.0 mill

Professional Staff:

270 expatriate man-months

Year:

1994 - 1997

SALIENT FEATURES Overall Project Cost Rs. 274.882 BillionsInstalled Capacity 969 MW, Four Units @ 242.25 MW each Dam Type Composite Dam (Gravity + Rock fill) Height / Length 60 / 160 Meters Average Annual Energy 5.150 Billion electricity Units Annually Average Head 420 Meters Design Discharge 280 Cumecs Tunneling Twin Tunnel ,Single Tunnel ,Tailrace Tunnel Length 19.54 km each, Length 8.94 km, Length 3.54 km EIRR 25.46 % Date of Commencement 30-01-2008 Expected Completion date November 2016 Implementation Period About 9 years (106 months)

Old KEY FACTS Project Duration Proposed: July 2002 – June 2010

Gross Head: 420 metres (original plan of 213 metres)

Dam Height: 148 feet

Water Diverted: 280 m3/sec

Length of Headrace Tunnel: 32.5 km (original plan of 28.49 km)

Power Generation Capacity: 963 MW (original plan of 500 MW)

Annual Energy Production: 5,150 GWh

Generation Cost: Rs 1.82 per KWh

By Print Media !!about international Funding

Location of Neelum–Jhelum Dam

Country Pakistan

Location Muzaffarabad

Coordinates 34°23 34″N 73°43 08″E′ ′ Coordinates: 34°23 34″N 73°43 08″E′ ′

Status Under construction

Construction began 2008

Opening date 2016 est.

Construction cost Rs. 274.9 Billion ($2.89 billion USD)

Owner(s) Water and Power Development Authority

Type of dam Concrete gravityImpounds Neelum RiverHeight 47 m (154 ft)Length 125 m (410 ft)Dam volume 156,000 m3(204,040 cu yd)[1]

Total capacity 8,000,000 m3(6,486 acre·ft

Name Neelum-Jhelum Hydropower PlantCoordinates 34°11 54″N 73°30 41″E′ ′Commission date 2015-2016 (est.)Type Conventional, diversionHydraulic head 420 m (1,378 ft)Turbines 4 x 242 MW Francis-typeInstalled capacity 969 MWAnnual generation 5,150 GWh

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