Soin-Koru Multi-purpose Dam Project

National Water Harvesting and Storage Authority

Hifadhi Maji, Boresha Maisha

Karima Kogi Water Pan Project, Murang'a County
Nyando Flood Control Works, Kisumu County
Koitoror Dam, Uasin Gishu County
Banita/Testai Pan Project, Nakuru County
Iria Dam work in progress, Kitui County
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Project Updates

Chemususu Dam

















The dam is located in Baringo County, Koibatek District and has a capacity of 15 million cubic meters or 15 billion litres. Chemususu Dam discharges 35,000 cubic metres or 35 million litres of water per day. It was designed to serve at least 50% of Baringo County population which includes towns and various institutions within the County.


Soin-Koru Dam


The Soin-Koru Dam Development project is proposed to be located on the Nyando River in the vicinity of Muhoroni in the Western part of Kenya. It shall be 60km from Kisumu City and 5km upstream of Muhoroni town. The Dam will be located in Kisumu and Kericho counties.


Siyoi - Muruny Dam

















The proposed Muruny Dam is located near Kapsait Primary School at Murkokoi Center which is approximately 43km from Kapenguria Town. The site location is covered on SK Map 75/4 Cherangany at GPS coordinates 36 N 0761064 and UTM 0129350, elevation 2690 masl at the riverbed. The project area lies within the Rift Valley Drainage Basin. River Muruny emanates from Cherangany Hills and flows in a North Eastern direction before finally draining into Lake Turkana.


Kiserian Dam









Kiserian dam is located along Kiserian River about 2kms from Kiserian Township and will supply water to Kiserian, Ongata Rongai and parts of Ngong’ townships. The present (2010) total population of the area is about 124,000 people with a water demand of 8,450m3   per day. The 18m high dam will store 1.22Mm3 of water and supply 15,700m3  per day of water to the townships which will meet the future (2020) water demand.


Maruba Dam

















In June 2010, NWCPC finalized rehabilitation of Maruba dam by raising the height of the embankment wall and spillway by 6 m. This increased the dam’s storage capacity from 0.60 Million m3 to 2.45 Million m3.  Increase in storage volume has ensured increase in water supply to Machakos Town and its environs from 2,050 m3/day to 8,700m3/day. 



Locate Our Dams

Soin-Koru Multi-purpose Dam Project


Soin-Koru Dam is a multipurpose dam located about five kilometers upstream of Muhoroni town and across Nyando River that forms the boundary between Kericho and Kisumu Counties.  The proposed project will reduce flooding problem on lower reaches of River Nyando. It will also supply 72,000m3/day of water for domestic use, irrigation of 2,570 Hectares of land and generation of 2.5MW of hydropower. The dam is proposed to be a zoned rock fill dam with an impermeable clay core. It will have water storage capacity of 93.7Million cubic metres. This project is funded by the Government of Kenya.

The dam embankment will be constructed across Koitatui and Got Alila Hills. The water treatment works are located about 1km to the downstream of the dam wall from where water will flow by gravity to low lying areas mainly on Kisumu side while water to serve Kericho side will be pumped to main storage tank at Kwa Nyangilo from where water will be served to various points on the targeted areas.


Project Objectives

  • To supply potable water to meet water deficit in Kisumu City and neighbouring areas like Awasi, Chemelil and Ahero
  • To supply potable water to meet domestic water needs within the areas pf Koitaburot, Chepsengeny, Kaplelach, Pala and Nyaidho areas of Awasi, Kapkisai and Simbi.
  • Other areas to be supplied with clean water include Kabore, Kapkormom, Kejiriet and Kaptalamwa, Kipsitet, Nyaberi, Baregeiwet, Kaitui, Kiprugumo, Sombicho and parts of Soko-huru.
  • Supply water for irrigation to ensure food security on lower areas of Awasi and Ahero. Project Supply Area


Project Supply Area

The project supply area consists of villages around Awasi and Ahero towns and Kisumu City on Kisumu County. On Kericho County, the supply area covers 65% of land mass of Soin Division that has two wards, namely; Soin and Soliat. The water will be pumped to a tank located at Kwa Nyangilo from where water will flow by gravity to most of the areas except some few supply areas where supply boosting will be required. These areas are upstream areas of Soin/Soliat wards.


Project Components

The proposed project shall consist of the following key components as shown in the table below:


Dam Embankment


Embankment crest length


Reservoir Storage Capacity


Water Treatment Plant


Hydropower generation



Project Benefits

  • Supply of water to parts of Kericho and Kisumu Counties. The parts to be supplied with water are as mentioned above. The project has made efforts to cover parts of Kericho County as a way of balancing benefits to the two counties. These areas will be served through pumping systems. The cost of pumping will be met by revenue realized from the power generation that will be fed into the national grid;
  • Flow of water in Nyando River will be regulated throughout the year. River Nyando forms the boundary between the two counties. This means that economic activities like irrigated farming will be made more vibrant.
  • Employment: A committee will be put in place consisting of representatives from Kisumu and Kericho Counties to take care of interests of all stakeholders. Among the duties of the committee is to oversee equitable engagement of persons from the two counties in provision of local labor and employment opportunities in the project


Project Implementation

The project is divided into two components as follows:

  1. Lot 1 (Dam Component) consisting of dam embankment and associated structures, hydropower generation plant and raw water main; and
  2. Lot 2 (Water Supply Component) consisting of water treatment works, trunk delivery pipelines and storage tanks.


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