Global Advanced Research Journal of Physical and Applied Sciences (GARJPAS)

August 2013 Vol. 2(1), pp. 001-007
Copyright © 2013 Global Advanced Research Journals

 

Original Research Paper

Hydrogeochemical analysis and evaluation of water quality in Lake Chala catchment area, Kenya

Josphat Mulwa K1*, Beatrice Mwega W2, Mathew Kigomo K2

1University of Nairobi, Department of Geology, P.O. Box 30197, Nairobi, Kenya

2Jomo Kenyatta University of Agriculture and Technology, P.O. Box 62000, Nairobi, Kenya

*Corresponding author Email: josphat_mulwa@yahoo.com; Tel: +254-20-4445896

Accepted 22 July, 2013

Abstract

Lake Chala is a transboundary fresh water resource with no surface water inflow or outflow and is located in the southwestern part of Kenya on the Kenya-Tanzania border. The lake catchment area is bound by longitudes 370 41’ E and 370 43’ E and latitudes 30 18’ S and 30 20’ S. The Lake has a surface area of 4.2 km2 and lies within a surface catchment area of about 16.23 km2, which falls within a semiarid region frequently facing severe water scarcity especially during periods of prolonged drought. The major economic activities in this area are agriculture, horticulture and animal husbandry which account for about 75-80% of household income.  Due to reliance on rain fed agriculture, water scarcity has often had negative impact on the people and there is need to tap the lake water for irrigation purposes. As such, water samples were collected on the Kenya and Tanzania sides from eleven (11) sites in March 2011 and subjected to analysis for chemical characteristics. Ten of the water samples show that the type of water that predominates in the study area is Ca-Mg-HCO3 type, while one water sample from a shallow well is a Ca-Mg-chloride type based on hydro-chemical facies. The suitability of water for irrigation has been evaluated based on sodium percent; residual sodium carbonate, sodium adsorption ratio and salinity hazard and are therefore suitable for irrigation purposes.

Keywords: Water quality, chemical characters, chemical classification, Lake Chala, Kenya.

 

 

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