The Lapche Khola Hydropower Project is a significant undertaking situated in the Bigu Rural Municipality of Dolakha District, within the Bagmati Province. This project, harnessing the power of the Lapche Khola River, boasts a substantial capacity of 42 MW, functioning as a peaking run-off-river scheme. The project’s hydrology is characterized by a catchment area of 644.85 square kilometers, a design discharge of 17.70 cubic meters per second, and a design flood discharge of 527 cubic meters per second for a 100-year flood event. At the heart of the project’s infrastructure is a barrage-type weir, stretching 18 meters in length, with a full supply level (FSL) of 2367.00 meters above mean sea level (amsl) and a minimum drawdown level (MDDL) of 2362.00 meters amsl.

The barrage is equipped with a sluice gate measuring 3 meters by 6 meters to manage sediment, complemented by three intake points and a gravel trap system. The headrace tunnel, an essential component for water conveyance, is an inverted D-shaped structure with dimensions of 4.20 meters by 4.20 meters and a length of 2380 meters, extending to the vertical shaft, including tunnels from each settling bay.