CONJUNCTIVE USE OF GROUNDWATER IN WESTLANDS, NAIROBI

Abstract
The water supply for Westlands is highly reliant on groundwater. This study is aimed at
providing for the coordinated use of groundwater and surface water supplies to provide relief
on the groundwater resource currently with over 400BHs tapping the aquifers in Westlands.
With an increasing population having a recent growth factor of 3.8, and disparity between
total piped water supplied and demanded at 62,541 m3/d and 104,235 m3/d respectively,
groundwater demand is on the rise. The good chemical, physical and bacteriological
composition of groundwater in Westlands highly increases its suitability.
With only 8.2% of the sample space for this study with BH data, 51% with BH permits and
actual extractions exceeding permitted extractions by 416%, groundwater management for the
Westlands’ aquifers remains wanting. Declining groundwater levels and the interference of
wells due to high BH densities in the area is also noted.
Improved groundwater management remains the priority recommendation for this study after
investigations. Proposals for the conjunctive use of groundwater in Westlands are made in the
active form. These include adoption of rainwater harvesting technologies, artificial aqu

active form. These include adoption of rainwater harvesting technologies, artificial aquifer
recharge methods in proposed areas and the improvement of the current piped water supply
system.

 

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