ANALYSIS OF RAIN AND RUNOFF WATER HARVESTING CHARACTERISTIC IN OHAFIA, ABIA STATE.

AUTHOR: EME UDA

DEPARTMENT: CIVIL ENGINEERING

AFFILIATION: NNAMDI AZIKIWE UNIVERSITY, AWKA

To solve the water supply problem in Ohafia, the present sources of water (rivers and streams) were visited. All the villages in Ohafia were visited to identify their water sources and topography. The Works department of Ohafia local government and National population Commission at Ohafia local government office were visited to collect necessary information. Projected population of Ohafia in 2028 will be 311, 609 persons occupying an area of 17km2. Total water demand per day was found to be 43,626 m3 /c/d using a per capita demand of 0.140m3 /c/d. Because of the size of the population and area, Ohafia was sectioned into zones using A,B,C,D and E. Designs were handled in zones using the smallest zone (zone A) as a pilot project. Sizes of different catchment pits were calculated. The raw water supply pipes and pumps were designed. Energy cost of pumping raw water was determined for each zone using N6.50/kw of energy. The capacities of existing tanks at Akanu and Ebem Ohafia were found to be 300m3 and 1080m3 respectively. After analysis, it was discovered that rain water collected from roof top is fit for drinking while the ones from sandy and clayey wells were polluted, had low pH and were contaminated. The water was treated (screening, aeration, sedimentation, filtration and disinfection) to make it fit for drinking. New tanks were designed and Bill of Engineering Measurement and Evaluation (BEME) done. The estimated cost of the system is N674,789,862 (Six hundred and seventy four million, seven hundred and eighty nine thousand, eight hundred and sixty two naira) only. The funding is by government and community joint partnership. The reinforced concrete intze tank was found to be cheaper than steel tank alternative. Distribution networks to consumers by gravity was designed including pipe sizes. Recommendations were made to ensure adequate water supply to the rural area using rain and runoff water.

TO VIEW THE FULL CONTENT OF THIS DOCUMENT, PLEASE VISIT THE UNIZIK LIBRARY WEBSITE USING THIS LINK, http://naulibrary.org/dglibrary/admin/book_directory/civil_engineering/11340.pdf

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