General Geographical Information
Sunkoshi Small Hydropower Project is a run-of-river type project constructed on Sunkoshi River located in Sindhupalchowk District of Bagmati zone of Central Development Region, Nepal. The project utilizes the flow of Sunkoshi River, which flows from east to west of the project area and is diverted at about 3.5 km upstream from the confluence of Sunkoshi and Botekoshi River.
The Sunkoshi Small Hydropower Project (SSHP) is situated on the Sunkoshi Khola in Sindhupalchowk District of Bagmati zone (Central Development Region-Nepal). The project utilizes the flow of Sunkoshi River, which is diverted approx. 3.5 km upstream from the confluence of Sunkoshi and Bhotekoshi river.
The climate of the project area is sub-tropical with temperatures ranging from 5°C in the winter to 25°C in the summer. Occasional snowfall also occurs in the mountain peaks of the catchment area.
Quaternary deposits (colluvial and alluvial) and the Kuncha formation (which mainly consists of rocks like phyllites, phyllitic quartzite, quartzite, and phyllitic grit stones) form the geological sequence of the project area, spanning from the headworks area to the powerhouse. The Main Central Thrust (MCT) is located approx. 20km to the north and the Main Boundary Thrust (MBT) lies around 70km towards the south of the Project area. Hence, the area can be considered to have moderate seismic activity.
The immediate project area consists of around 30% forestland. The rest of the land is either cultivated, vegetated or barren.
The Sunkoshi Small Hydropower Project (SSHP) is situated primarily in Dhuskun VDC of Sindhupalchowk District between latitudes 27°46’ N to 27°48’ N and longitudes 85°53’ E to 85°56’ E. However SSHP also touches Chokti and Karthali VDCs, due to afflux extending to the boundaries of these two VDCS, and Barhabise VDC, since the access road to the project site passes through it. The altitude ranges from 955m (headworks site) to 830m (tailrace).
The Project Headworks is situated on the Sunkoshi Khola 3.5 km above its confluence with the Bhotekoshi River in Dhuskun VDC. A broad crested diversion weir diverts the flow to a desander basin, after which it follows a 2949m long rectangular lined canal. 13 cross drainage structures exist to ensure that the canal does not obstruct any natural drains. At the end of the canal, a forebay connects the canal to a steel penstock pipe of 0.9m diameter and 289.5m length. The penstock pipe has an end bifurcation and leads the water to the powerhouse.
The powerhouse is situated about 300m downstream from the confluence of Sunkoshi and Bhotekoshi River. It hosts 2 turbines (Turgo) of 1317 KW capacity each. It is 6m in width and 16m in length.
Power evacuation from the SSHP is made through Sunkoshi sub-station at Lamosanghu via a 6.3 km long 11kV transmission line.
Locals of the area primarily live in clusters based on their ethnicity, castes, and status. Housing patterns are rather uniform, irrespective of castes or economic statuses. Although there is social stratification based on gender in the project area, caste/ethnicity related hierarchical segregation is relatively low compared to other rural areas of the nation.
The locals are primarily engaged in agriculture, with paddy, maize, millet, pules and soybeans being the main crops cultivated and potatoes being the main cash crop of the area. In addition to agriculture, the locals also employed in the sectors of service, business, industry, and etc. in a lesser capacity. The project area is relatively well exposed to commercial as well as mechanized industrial activities.