Kenya - Thwake Multi-purpose Water Development Program – Phase I

Project Summary

Approval Date 30 Oct 2013
Signature Date 27 Jan 2014
Planned Completion Date 30 Jun 2023
Sovereign / Non-Sovereign Sovereign
Sector Water Supply & Sanitation
DAC Sector Code 14010
Environmental Category 1
Commitment U.A 62,890,000
Status Implementation

Project General Description

The present intervention focuses on the first phase of the The Thwake Multi-purpose Water Development Program (TMWDP). This intervention comprises a multi-purpose dam for water supply, hydropower generation and irrigation development. It will also provide regulation of flows on Athi River downstream of the dam for flood and drought mitigation. The TMWDP targets broad improvement in productivity and livelihoods over a ten-year period, ending 2023. In phase 1, the program will increase water security by providing 681 million cubic metres (MCM) of water storage, earmarked for phases 2, 3 and 4 as follow: 34 MCM for human consumption, 625 MCM for double usage (power generation and downstream irrigation), 22 MCM for upstream irrigation, and an allocation for downstream conservation flow. The main expected outcomes are increased water security within the zone of influence of the dam, a firmer foundation for the development of cross-sectorial approaches to water management, and reduction in risk factors by increasing capacity for flood and drought related disaster preparedness.

Project Objectives

The goal of this first phase is to enhance water security. The objective is to increase water storage for rural and urban human consumption, for irrigation and livestock and for hydropower, with a principal focus on the semi-arid counties of Kitui and Makueni.


The program target beneficiaries are the 674.7 thousand people in the rural areas of Kitui and Makueni (poverty rates of 62.5% and 63.8%, respectively) and the 640 thousand people to occupy the land reserved for the new urban ICT city of Konza. Other beneficiaries comprise the institutions managing the water resources in Athi River Basin and the economy of Kenya.

Participating Organization

African Development Fund
Government Of Kenya
Ministry of Water Development


IATI identifier 46002-P-KE-E00-008
Last Update 05 Dec 2022


Contact Details

Name MUTASA Christopher

Geographic Location

Country Kenya
Coordinates Location Name
-1.835 38.451 Kitui
-2.222 37.872 Makueni
-1.76667 37.7167 Thwake Sub-Surface Dam