Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Titre : The Hydrogeology and Groundwater Quality Assessment of Kisumu Town Area in Kenya

Auteur : OIRO Samson Omondi

Université de soutenance : Universiteit Gent

Grade : Master of Science (MS) Physical Land Resources 2011

Résumé
Groundwater is multidimensional concept and is characterized by location, occurrence over time, size, aquifer properties and accessibility. The groundwater composition is determined by composition and mixing ratio of end members, hydrodynamics/mass transport processes and chemical reactions. Infiltration of precipitation influences groundwater quality. The quality of water in the region is also determined by the geological composition of the aquifers and human activities in the area. Well log data, chemical properties of the groundwater measured at sampling time, chemical analysis reports of wells at well sinking time and laboratory analysis of the water samples collected for the thesis work were put together in a discussion shedding light in understanding and interpretation of the analysis, in relation with the past relevant works. The study area has a complex geology with two main aquifers. Due to a great need in assessing and monitoring of groundwater quality and quantity, well lithological data and chemical analysis of samples were used to understand the hydrogeology and hydrochemistry of the study area. Grapher, GIS, PHREEQC and AQUACHEM programs were used in the analysis and interpretation. Qualitative assessment of groundwater was done in this study area to understand the suitability of the groundwater for domestic use. The majority of groundwater was found to be very soft, water type to be NaHCO3 and NaMix. The main problem in the study area was found to be that of NO3- and F-concentration. Anthropogenic pollution in the area is mainly through poorly managed waste disposal and sinking of pit latrines all over the slums in the study area

Source : Pedon 23 - Physical Land Resources - Universiteit Gent