The Lower Nzoia Irrigation Development Project Phase I is located in two counties in Western Kenya namely Siaya and Busia, as shown in Table 1-1 and figures 1.1 and 1.2. In total 16 Sub-locations within 6 Locations in 3 Districts benefit from the project. The Project area has a gross command area of 5774.4 ha and 4042.08 ha net command area. Existing Bunyala Pump Irrigation Scheme with a net irrigated area of 213.7 ha (534.25 acre) is included within the project area. This pump will be relocated to another area later.

As currently designed, the flood protection works comprise of 5.8 km of new dykes and 28.4 km of improvement of existing dykes. The main works on the IFMS component comprise an earth embankment of about 5.0 m high, which also provides a 5.0 m wide gravel road along the crest, a seepage grout curtain and rainfall run off control gates.