dhauliganga project

Dhauliganga Hydro Electric Scheme Uttarakhand , India Project Description Dhauliganga I hydro-electric project is the first and the lowest stage of harnessing this tributary of the River Kali, and is located near the Nepali border, about 600 km north east of Delhi. It is essentially a run-of-river scheme, with limited storage, able to develop a gross head of about 300 m, with an installed capacity of 280 MW. The key structure of the project is the 56 m high, concrete-face rockfill dam (CFRD), one of the first dams of this type to be founded on alluvium, the deposits of which at the dam site are up to 60 m thick. A design was developed for the sealing of these alluvia by means of a very deep diaphragm (plastic concrete) cut-off wall. The head of the cut-off wall is connected to the dam face by an articulated plinth of unusual design. The gated spillway and power intake structures are located adjacent to the dam and are designed to minimise the inflow of sediments into the pressure waterways, whilst allowing their efficient flushing from the reservoir during periods of flood. Desilting chambers are nevertheless still needed and these are located underground, directly d/s of the power intake structure. The surge chamber is a 15 m dia. vertical shaft below which the two, partially steel-lined pressure shafts, each of 4 m dia., convey water to the four 70 MW located in the power cavern. The generated energy is converted to 220 kV by twelve, single- phase transformers housed, together with the gas-insulated switchgear, in a separate, parallel cavern. A 330 km, 220 kV double-circuit line connects into the NHPC sub-station at Bareilly. Client National Hydroelectric Power Corporation (NHPC) Project A 280 MW, medium head, diversion scheme with daily storage capacity. Service provider Poyry Energy, in association with Nippon Koei. Services • Review of feasibility studies, project concept and structures, elec- tro-mechanical equipment and construction schedule. • Review of and assistance in pre- paring final (tender) designs of all project structures and site installa- tions. • Review of and assistance in pre- paring tender documents for four construction and supply lots, capi- tal cost estimates and detailed programme for project realisation. • Specialist advisory services for design of CFRD, foundation treat- ment (diaphragm cut-off wall), hy- draulic model tests and rock me- chanics. • Studies of the risk of glacier lake outburst floods. • Establishment of quality control system and preparation of manu- als for management and quality control of civil works. • Assistance to NHPC in pre- qualification of tenderers, evalua- tion of international tenders and contract award procedures. • Training and transfer of technology programme for NHPC technical staff participating in the studies. • Assistance in setting up a panel of technical experts. Services Period July 1997 to December 1999 Poyry Energy www.poyry .com

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8/13/2019 Dhauliganga Project

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Dhauliganga Hydro Electric SchemeUttarakhand, India

Project DescriptionDhauliganga I hydro-electric project isthe first and the lowest stage of

harnessing this tributary of the RiverKali, and is located near the Nepaliborder, about 600 km north east ofDelhi. It is essentially a run-of-riverscheme, with limited storage, able todevelop a gross head of about 300 m,with an installed capacity of 280 MW.The key structure of the project is the56 m high, concrete-face rockfill dam(CFRD), one of the first dams of thistype to be founded on alluvium, thedeposits of which at the dam site areup to 60 m thick. A design wasdeveloped for the sealing of these

alluvia by means of a very deepdiaphragm (plastic concrete) cut-offwall. The head of the cut-off wall isconnected to the dam face by anarticulated plinth of unusual design.

The gated spillway and power intakestructures are located adjacent to thedam and are designed to minimise

the inflow of sediments into thepressure waterways, whilst allowingtheir efficient flushing from thereservoir during periods of flood.Desilting chambers are neverthelessstill needed and these are locatedunderground, directly d/s of the powerintake structure.The surge chamber is a 15 m dia.vertical shaft below which the two,partially steel-lined pressure shafts,each of 4 m dia., convey water to thefour 70 MW located in the powercavern. The generated energy is

converted to 220 kV by twelve, single-phase transformers housed, togetherwith the gas-insulated switchgear, in aseparate, parallel cavern. A 330 km,220 kV double-circuit line connectsinto the NHPC sub-station at Bareilly.

Client

National Hydroelectric PowerCorporation (NHPC)

ProjectA 280 MW, medium head, diversionscheme with daily storage capacity.

Service providerPoyry Energy, in association withNippon Koei.

Services

• Review of feasibility studies, project concept and structures, elec-tro-mechanical equipment andconstruction schedule.

• Review of and assistance in pre-paring final (tender) designs of allproject structures and site installa-tions.

• Review of and assistance in pre-paring tender documents for fourconstruction and supply lots, capi-tal cost estimates and detailedprogramme for project realisation.

• Specialist advisory services fordesign of CFRD, foundation treat-

ment (diaphragm cut-off wall), hy-draulic model tests and rock me-chanics.

• Studies of the risk of glacier lakeoutburst floods.

• Establishment of quality controlsystem and preparation of manu-als for management and qualitycontrol of civil works.

• Assistance to NHPC in pre-qualification of tenderers, evalua-tion of international tenders andcontract award procedures.

•

Training and transfer of technologyprogramme for NHPC technicalstaff participating in the studies.

• Assistance in setting up a panel oftechnical experts.

Services PeriodJuly 1997 to December 1999

Poyry Energywww.poyry .com