Detailed Engineering Design of Lagan Khola (Brahmayani – A) Hydroelectric Project (9.7 MW)

  • Project: Detailed Engineering Design, Construction Drawing, Cost Estimation, BoQ Preparation and Tender Preparation works of Lagan Khola (Brahmayani - A) Hydroelectric Project (9.7 MW)
  • Client: Integrated Hydro Fund Nepal Pvt. Ltd.
  • Location: Sindhupalchowk
  • Date: Ongoing

The project consist of preparation of Detailed Engineering Design Report, Updated Feasibility Study Report, Tender Documents for Civil, Hydromechanical & Electromechanical Works of Lagan Khola (Brahmayani – A) Hydroelectric Project (9.7 MW), which includes the construction planning and scheduling, preparation of construction & reinforcement drawings, Cost estimation & preparation of BoQ, Structural analysis of project components. The Consultant is carrying out the assignments as per ToR.

The proposed Lagan Khola (Brahmayani–A) Hydroelectric Project (9.7 MW) is situated in Wards 1 and 2 of Jugal Rural Municipality, Sindhupalchowk District, Bagmati Province, Nepal. The project derives its water supply from the Permasal Khola and Langtang Khola, both of which are perennial, snow-fed rivers originating in the high mountain and mid-hill regions. Access to the project area is available from Kathmandu via an existing all-weather road up to Balephi (approximately 110 km). From Balephi Bazar to Gumba village, the route extends through an earthen road of approximately 40 km. Thereafter, the project site can be reached by undertaking a one-day trek from Gumba village to Chintang Village.

Brahmayani-A Hydroelectric Project is a run-of-river type of project. The installed capacity of the proposed project shall be 9.7 MW corresponding to the design discharge of 2.2 m3/s to be diverted from Lagan Khola. The main components of the projects are Broad Crested Weir, Undersluice, Intake, Gravel Trap, Surface Settling Basin, Headrace Pipe, Headrace Tunnel, Surge Shaft, Penstock, Surface Powerhouse, Tailrace, switchyard  & 132 kV Single Circuit Transmission Line and Interconnection facilities required for power evacuation from the project.

Overall services provided by firm

The scope of services includes, but not limited to, carrying out the following activities as the main design consultant:


  • Review of previous feasibility study.

  • Recommend and Supervise additional detailed topographic survey of headwork site, powerhouse, pipe alignment, portal area and access roads wherever deemed necessary.

  • Detailed hydrological analysis, development of rating curve based on available measurement & stage data and its impact to project components, low flow analysis and sediment study.

  • Review of previous geological study, detailed surface mapping wherever deemed necessary, assessment of construction materials and its necessary lab tests, recommendation /supervision of additional geological investigation and drilling works.

  • Detailed Hydraulic Design, Structural Design and preparation of reinforcement drawing of the project components.

  • Feasibility Study of 132 kV Single Cicuit Transmission line from its switchyard to switchyard of d/s project Brahmayani HEP 45 MW.

  • Preparation of detail construction schedule.

  • Preparation of complete set of tender documents for Civil works, Hydro-Mechanical works and Electro-Mechanical works.

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