Pre-feasibility Study of Kaligandaki-Nawalparasi Diversion Project

Project Description

The main objective of this study is to carry out pre-feasibility level study to identify various components of the diversion projects with irrigation and hydropower as the major water users; and as such a decision is made to decide for further study based on it’s economical, financial, and environmental considerations.
The gross command area under irrigation from this is about 16,000 ha (with Net Command Area 10,072 ha) mostly in the southern part of East-West Highway covering 14 VDCs of eastern part of Nawalparasi district namely; Agyauli, Amarapuri, Dibyapuri, Kolhuwa, Kumarwarti, Mukundapur, Narayani, Pithauli, Pragatinagar, Prasauni, Rajahar, Ratanpur, Shiva Mandir, Tamsariya. The canal runs more or less parallel to the East-West highway and cross it at one point. The power generated is 3.6 MW. The length of the main canal is about 65.2 Km and with carrying capacity of 12 cumecs, there are number of cross drainage structure reauired and the alignment is east to west and natural drains flow in north to south direction. Appropriate structure have been provisioned to counter these topographical features. The total project cost is estimate at NRs. 3,011 millions.

Assignment Description

Review of documents, literatures, past studies, maps, drawings • Assessment of water availability in Kaligandaki basin and Nawalparasi (valley part only) • Assessment of water requirement for ongoing and completed projects for year round irrigation • Assessment of water availability for transferring Kaligandaki river water to Nawalparasi after allocating water to the committed water requirements in the downstream • Assessment of water availability within and around the command area from different local sources and finding out the required water to be diverted to command area (gross command area about 16,000 ha) • Identify possible headworks site in Kaligandaki river, tunnel alignment, power house area, main canal alignment, and main canal structures • Satellite image processing, GIS based maps preparation etc. • Main canal survey (65 km), GPS survey for existing irrigation system, irrigation inventory • Conduction of Electrical Resistivity Tomography (ERT) Test and geological mapping • Irrigation system planning, agriculture system planning, hydropower system planning • Preliminary design of various civil, mechanical and electrical components of the project • Estimation of project cost, preparation of implementation plan etc. • Assessment of cost and benefit of the project and carry benefit cost analysis • Recommendation for further study • Preparation and submission of Inception, Field, Draft and Final Report