The Rani Jamara Kulariya Irrigation Project (RJKIP) envisages irrigating about 20,300 ha of land in Kailali District in the Far Western Development Region. The command area covers 10 VDCs extending from the Karnali River in the East to the Pathariya River in the West and forest boundary in the North to Nepal-India Border in the South.
RJKIP plans to abstract water from the Karnali River near the village of Chisapani, which is where the Karnali River emerges out of the hills and enters into the alluvial plain. The intake is located just downstream of the East-West Highway bridge across the river. Around 500 m downstream of the bridge, the Karnali bifurcates into two channels, the Geruwa on the left and the Kaudiyala on the right. In 1983, a major flood caused the Geruwa to become the major channel, receiving all the flows during the low flow period and most of the flood flows. This change made it very difficult for the farmers in the Rani, Jamara and Kulariya systems to divert irrigation flows from the Karnali into their canal systems. Each year the farmers have been excavating a 3 km channel to guide the flow towards the west bank. In addition, during floods, uncontrolled flows carrying excess water and sediment have been entering the canal systems due to the lack of control structures. The systems are thus becoming unreliable and ineffective in providing appropriate irrigation supplies.
The Government of Nepal intends to construct a new system to supply the three existing farmers’ managed irrigation systems and to extend irrigation to a new area of about 7,000 ha to the north of the existing irrigated area. Accordingly, the Department of Irrigation (DOI) established a unit office in FY 2008-09 in the Far Western Regional Irrigation Directorate, Dhangadi, to conduct studies for the detailed design and initial environmental examination of this Project. The RJKIP was established in FY 2010-11 under the DOI at Tikapur, Kailali, to expedite the work of providing assured supply of irrigation water and rehabilitation of the existing systems.
The Project envisages the construction of a permanent side intake at Chisapani, a settling basin at about 4+950 m, a main canal up to 8+875 km (bifurcation point of New Branch Canal), a New Branch Canal of 14.4 km length and a feeder canal of 11.09 km to feed the three existing Rani, Jamara and Kulariya systems. The new intake at Chisapani will have a capacity of 100 m3/s to supply the three existing systems plus the new area. A settling basin with hydraulic flushing arrangements has been proposed to remove sediment from the main canal and flush it back into the Karnali River. The main canal up to the settling basin has been designed for 100 m3/s capacity, including a flushing discharge of 20 m3/s. The capacity of the main canal from the settling basin to the bifurcation point with the NBC is thus 80 m3/s. The existing traditional farmers’ systems will also be modernised and rehabilitated with the provision of various structures such as head and cross regulators, secondary and tertiary outlets, cross-drainage structures, road bridges and culverts and farm roads.
CMS is undertaking consulting assignment to prepare the design drawings to be issued to the International Contractor; layout of the intake (headworks) structure on the right bank of the Karnali river (100 m3/s diversion discharge) and other associated structures; construction supervision and quality control of the construction materials, civil works and front gate installation (14 bays, each of size 5.0m in width and 8.4m in height) of the intake construction; assist in project and contract management of the civil works contract of the intake construction; collection and data management and then analysis of river sediment at the intake site of the Karnali River; and carry out a pre-feasibility study for hydropower generation in the feeder canal with a possibility of 3.2 MW installed capacity including structural rearrangement for the hydropower component. The total duration of the consulting assignment is 36 months starting from the February 2012.