Design Review of Hydropower Components (Hydraulic Part) of Bheri Babai Diversion Multipurpose Project

Design Review of Hydropower Components (Hydraulic Part) of Bheri Babai Diversion Multipurpose Project

Design Review of Hydropower Components (Hydraulic Part) of Bheri Babai Diversion Multipurpose Project

Project: Bheri Babai Diversion Multipurpose Project

Assignment: Design Review of Hydropower Components (Hydraulic Part) of Bheri Babai Diversion Multipurpose Project

Location: Surkhet District, Nepal

Client: Department of Water Resources and Irrigation

Duration:  November 2018 to December 2018

Project Description: Bheri Babai Diversion Multipurpose Project (BBDMP) is located in Bheri Ganga Municipality, Surkhet District, Karnali Province of Nepal. The project is an inter-basin water transfer scheme which will provide 40 m3/s of irrigation water year-round by routing the Bheri River water into the Babai River. The augmented flows will be used by Babai Irrigation Scheme to irrigate about 51,000 hectares of the command area. Since there is head difference of about 147.18m between the Bheri off-take and Babai River at its terminal point, about 46.80 MW of the power output can be harnessed by utilizing this head difference by constructing a hydropower station.

Scope of Services:

1. Study of river hydraulics using HECRAS model in different flow conditions with or without structures; Annual Flood, 2 years, 5 years, 10 years, 20 years, 50 years, 100 years, 200 years, 500 years, 1000 years flood
2. Review of overall layout of project including layout of headworks, surge tank, penstock and powerhouse;
3. Design Review of Barrage (6 nos, 15.30 m Width × 13.0 m Height each), Undersluice, Intake (6 nos. 4.5 m Width × 3.0 m Height each), approach canal (3 Nos, 43.15 m long), settling basin (length 157.40m x width 15.0 m and Depth 6.65 m, 3 bays), flushing systems and headpond (3600 m3)
4. Design Review of surge tank (dia 12.5 m x height 58.0 m), penstock (dia 3.85 m, length 808 m), powerhouse (51.25 m length x 16.0 m width) and tailrace (4.6 width x 3.3 height, 21.85 m length);
5. Carryout seepage analysis at Barrage and Undersluice section by finite element model (Phase 2 Software); and
6. Review of penstock design to check if negative pressure (Cavity Zone) occurs along the length of the penstock, by performing HYTRAN software.