Large Dams

Brief Information on Construction of Large Dams
The following are brief notes on each of the large dam under construction by NWCPC:


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.  It is approximated that the project serves more than 200,000 people in Machakos County.  Machakos Peoples Park is majorly successful due to the beautiful scenery provided by Maruba Dam.  

The Scope of Works
This project was built entirely by the Corporation using its internal capacity.  The scope of the project entailed construction of the following:-
•    Increasing the height of the dam and spillway sill by 6 meters
•    Construction of new water treatment plant to meet the increased water demand in Machakos Town and environs.
•    Refurbishment of the existing treatment works.
•    Laying of a new pipeline to existing water storage tanks

Current Status
Construction of this dam started in September 2008 and was completed in June 2010.  The construction was undertaken by National Water Conservation and Pipeline Corporation through our in-house capacity.  
The Dam was commissioned in the year 2010 and is currently main water supply source for the Machakos town and its environs


Umaa dam is located along river Nzeu about 7kms northeast of Kitui town, Kitui County. The 28m high dam when completed will store 870,000m3 of water and inject an additional 2,500m3/day of water to Kitui town and serve about 75,000 people.
Current Status
The overall completion of the dam construction works is estimated at 68%.


 Kiserian dam is located along Kiserian River about 2 kms from Kiserian Township and supplies water to Kiserian, Ongata Rongai and parts of Ngong’ townships.  The 18 m high dam has a reservoir capacity of 1.2 million and supply capacity of 15,700m3/day of water.  When fully operational the dam is expected to serve approximately 253,000 residents of mainly Kiserian and Ongata Rongai.

The scope of the project entails construction of the following:-
•    Dam embankment 18 m in height.
•    Raw water pipeline.
•    Water Treatment Works of capacity 15,700m3/day.
•    Water Storage tank 5,000 m3 capacity.
•    Housing and other ancillary works.
Current Status
The overall physical progress of the works is substantially complete save for full operationalization/commissioning of the entire works and some snag list items; which shall be executed by the contractor during the defects liability period.