Executive design and completion of works for the rehabilitation of water and sanitation systems of kiambere basin and capacity building: (project design and works)

[Publication Reference: KIAMB/II/02]


Maximum Budget: Euro 13,267,000.00

March 2015


1.1Beneficiary Country


1.2Contracting Authority

Tanathi Water Services Board – Kitui (Kenya)

1.3Relevant Country Background

In the late ‘90s, the Government of Kenya requested, the Government of Italy, to complete the water system, laid by Italian Cooperation in Kiambere and Kirandich dams. Beneficiaries of the project are the 100,000 inhabitants, who will be able to take advantage of new water supply and sanitation system in line with the quality standard set for the water sector.

The Kiambere water supply and sanitation system is located in Mwingi District about 200 Km north-east of Nairobi. The project was divided into two phases: the Italian Cooperation from 1995 to 1999 achieved the first one.

In 2007, the Government of Kenya renewed its interest for the completion of the Kiambere aqueduct and the construction of a sewage system in Mwingi town. The Water Sector Institutions of the water infrastructures built will benefit from the Phase II Executive design and civil works included into the project.

The project is located in Mwingi Sub County in the Kitui County of the Republic of Kenya. Mwingi Town is a commercial centre; furthermore, it is sub county headquarters hosting Kitui county government offices. It’s divided into nine administration divisions and the project is covering most of them.

The borders are delineated to the west by Tana River and Kiambere Reservoir, to the North and West by the centres of Tseikuru, Katse, Kimangao and Kyuso, and, to the south, by Mwingi Town. The project covers a large area of the Sub County at an altitude of 1,270 m to the south and 700 m to east along Tana River boundary.

1.4Current State of Affairs in the Relevant Sector

The initiative will complete the national program of water development in the Mwingi area, significantly contributing to its economical development and to the improvement of life condition of the local community;

The execution of the project proposed is under the responsibility of the Tanathi Water Services Board (TAWSB) as an operational counterpart;

At the end of the project Tanathi Water Services Board will take over the responsibility of the infrastructures constructed and their management will be entrusted to the relevant water service provider,

To support the operational counterpart the project foresees a capacity building component, to strengthen the capabilities of technical staff, the supply of appropriate technical instruments and rehabilitation of the offices;

The availability of potable water supply and sanitation systems is an important trigger for the economic and market development;

The loan is disbursed by the Italian Co-operation under the current rules and modalities for the concession of soft loan to Kenya.

1.5Related Programmes and Other Donor Activities:

Italian Co-operation worked at the first phase of Kiambere project from 1995 to 1999. The achieved results included:

Water intake in the Kiambere reservoir and related pumping system;

Water treatment plant with a capacity of 3,300 cubic meters/day;

Pumping station and rising main to a water tank of 800 cubic metres, situated on a hill at an elevation of about 600 m. higher than the treatment plant;

Water distribution pipeline by gravity from the above tank to no. 6 villages and to Mwingi town;

N. 6 water tanks in the above villages, and other 6 water tanks plus a big water tank of 2,700 cubic metres in Mwingi town;

N. 6 water kiosks served by the above water tanks for the water supply in the 6 villages, and 6 water kiosks in Mwingi Town.

Water supply pipeline from the big tank in Mwingi town to the Sub- county Hospital.


Some of the above mentioned infrastructures were specifically dimensioned for a future expansion of the project, in order to complete the water supply to Mwingi Town and to other rural villages. The project design already foresaw the possibility of an extension of the system.


2.1 Overall Objective

The overall objective of the project is: Improvement, of health, social and economic conditions for communities and population living in target areas.

2.2 Purpose

The purposes are:

To assure water services and sanitation infrastructures to 55,000 people living in the target areas. The target area is 10,030 km2;

Complete use of the existing water resources;

Improvement of technical and managerial capacities of the Institutions involved in the management of the water infrastructures built, through the Capacity-building component.

2.3 Results to be achieved by the Contractor

Water treatment plant completed in Kiambere dam site;

Water supply system completed in the project area;

Sewerage system constructed in Mwingi towns;

Enhancement capacity of existing Water Sector Institutions;

Significant reduction of power costs for the pumping of water.




3.1 General

The project is in procurement stage and actual civil works expected to start by end of June 2015

4.1.1 Description of the Assignment 



4.1.2 Geographical Area to be covered  

Mwingi Sub County

4.2.Specific Activities

-Executive design;

-Upgrade of existing water treatment and pumping plants, including:

•Intake works;

•Raw water main;

•Treatment plant.

-Water distribution pipeline, including:

•rising main and distribution lines;


•access roads and ancillaries;

-Sewerage system and waste water management plant in Mwingi town (site A and site B), including:

•Sewerage system in Tyaa (site A)

•Waste water treatment plant in Tyaa (site A)

•Sewerage system in Kivou (site B)

•Waste water treatment plant in Kivou (site B)

4.3.Project Management

Responsible body:

Tanathi Water Services Board, the Contracting Authority.

Kiambere Mwingi general layout of project area

Existing Intake Works for the current Kiambere Mwingi Water supply project

Contractors on the pre-site visit during tendering process

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