The potential for roof catchment rainwater harvesting and storage in Upper Mikuyuni sub-catchment, Kenya
Mwendwa, Georgia Ndanu
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Water scarcity is a major concern in the Upper Mikuyuni sub-catchment and rainwater harvesting has the potential to address the current shortfall in water supply. The main objective of the proposed study is to assess the potential for roof catchment rainwater harvesting and storage and its contribution to household water availability in Upper Mikuyuni Sub-Catchment. Specific objectives will be; to determine the rainfall characteristics for the last 30 years from 1982-2012 in Upper Mikuyuni Subcatchment; to establish the household's socio-economic characteristics influence on roof catchment rainwater harvesting and storage in Upper Mikuyuni sub-catchment and to assess the roof catchment RWH storage potential in relation to rainfall, roof catchment extent and reliability to meet household water demand in Upper Mikuyuni Sub Catchment, Athi basin. Historical rainfall data series for 30 years will be obtained through interpolation by IDW method and the rainfall characteristics including the pattern, frequency and the variability will be analysed descriptively using Excel and In-stat program. Cross-sectional data on socio-economic characteristics relating to roof catchment rainwater harvesting will be collected from 98 households calculated from a total of 3293 households selected in stratified random manner for the study using questionnaire for households and in depth interview for key informants. The data shall be analysed using stepwise regression model to determine socio-economic characteristics influencing rainwater harvesting while a daily water balance model will be used to determine the potential for roof catchment rain water harvesting storage; by input of the 30 years rainfall data, the household daily per capita demand and roof catchment size at various reliability levels using both typical and long term method for 30 households selected using purposive sampling method. The proposed study will provide information for informed decision making to improve the RWH using roof catchment and storage especially in ASAL areas as an alternative source of water through combining socio-economic and climatic information. In addition the study will contribute towards providing guide to policy on household rainwater harvesting and storage as well as informing community on appropriate storage to meet household water demand.