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Consulting Services for Feasibility study of Sun Koshi Marin Diversion Project

Funding Agency: Government of Nepal, Department of Irrigation
Client: Irrigation Feasibility Study and Construction Quality Program, Department of Irrigation
Date: June 2014 – June 2016

Sunkoshi-Marin Diversion Project (SMDP) is located at Sindhuli District of CDR and the diverted water is projected to irrigate agricultural lands in Bara, Rautahat, Sarlahi, Mahottari and Dhanusha District through Bagmati Irrigation Project (BIP). The proposed command area of BIP is 122,000 hectares (Eastern Canal: 76600 ha Command Area( Sarlahi, Dhanusha ,and Mahottari Districts) and Western Canal: 45400 ha Command Area (Sarlahi, Rautahat and Bara Districts). The SMDP headwork is accessible from BP Highway which is 102 km far from Kathmandu. The powerhouse area is accessible from Sindhuli Bazar which is located at Kundule, 8 km gravel road connects the Kundule to Sindhuli market.

The main objective of this study is to perform detailed feasibility Study and Detailed Design of Sunkoshi-Marin Diversion Project. Four distinct component-wise objectives are:

A.   Development of irrigation facilities in Bagmati Irrigation Project with the water of Sunkoshi River diverted to Marin River, which basically involves Renovation and extension of existing irrigation system of Bagmati Irrigation Project in about 122,000 hectares of land, to make conjunctive use of water of Bagmati River and water diverted from Sunkoshi River.

B.   Review and assessment of the previous studies (Water Study, Master Plan of Bagmati River etc.)

C.   Inventory Survey or irrigation System within the Bagmati Irrigation Project

D.   Detailed Feasibility Study and Detailed Engineering Design, Topographical Survey and Geotechnical Investigation of 36 MW Sun Koshi Marin Diversion hydropower project

The project has following Hydropower Features:

  1. Headrace Tunnel: 1 Km Length with 9m Diameter
  2. Penstock: 110m Length, 6.4m Dia Circular Pressure Tunnel
  3. Maximum Intake Discharge: 7 m3/s including 10% flushing discharge
  4. Diversion Structure: Concrete Weir (180m Length and 2.0m Height)
  5. Headrace Canal: 300m Length, 10m Width and 4.5m Height
  6. Weir Portion: 12 no of 12 m length of each
  7. Under Sluice Portion: 3 no of 12m length of each
  8. Spillway: Emergency Side Spillway (3 no of 12m length)
  9. Intake: Side Intake (3 no of 7m length gate)
  10. Settling Basin: 1 no two chamber of Bieri Type (140*35*9)m size
  11. Surge Tank: 20m Diameter and 55m Depth
  12. Powerhouse: Subsurface type and Size 70m*40m*30m
  13. Tailrace Canal: 300m*10m*4.5m
  14. Turbines (36MW): 4 No of Francis with Spiral Casing with 57.5m head, 19.25 m3/s Discharge and 9MW power each
  15. Generators: 3 Phase Synchronous with 4*11.5MVA Output
  16. Transmission Line: 7 Km Length with132KV Voltage
  17. Construction Period: 5 Years
  18. Energy Generation: 36 MW with total energy 303.24 GWh

Overall Services provided:

The Joint Venture of ITECO/TMS/ ICGS is responsible to conduct below mentioned services under Detailed Feasibility Study and Detailed Engineering Design, Topographical Survey and Geotechnical Investigation of 36 MW Sun Koshi Marin Diversion hydropower project:

A.   Surveys & Investigation

i.   Field Investigations

  1. Topographic Survey
  2. Logistic Surveys
  3. Transmission Line Survey
  4. Access Road Survey
  5. Construction Material Survey
  6. Plain Table Survey
  7. Longitudinal and River Cross-section Survey

ii.   Investigations

  1. Engineering Geotechnical/Geological investigation, study and mapping
  2. Hydrological, Metrological and Sediment logical studies
  3. Seismic activity Investigation

B.   Detailed feasibility study

C.   Selection of Tunnel Alignment & Support

D.   Detailed Engineering Design and drawings

  1. Design of Civil works
  2. Design of Electro-mechanical equipment
  3. Design of all major hydropower and irrigation components
  4. Design of hydraulic structures
  5. Design of power generating equipment and substation
  6. Construction Facilities
  7. Diversion Facilities
  8. Headwork
  9. Headrace Tunnel/Canal & Surge Tank
  10. Powerhouse single line diagrams
  11. Switchyard & Transmission line

E.   Preparation of Tender Documents

F.   Construction Planning

G.   Cost Estimates

H.   Economic Evaluation