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Igbojionu, D. O.
Department of Agricultural Engineering Technology, Federal College of Land Resources Technology, P.M.B. 1518 Owerri, Nigeria
Obineche, C. I.
Department of Agricultural Engineering Technology, Federal College of Land Resources Technology, P.M.B. 1518 Owerri, Nigeria
Durumbah-obih, F. M.
Department of Environmental Technology, Federal College of land Resources Technology, P.M.B.1518 Owerri, Nigeria
Akuwudike, A. E.
Department of Agricultural Engineering Technology, Federal College of Land Resources Technology, P.M.B. 1518 Owerri, Nigeria
ABSTRACT
This study was carried out to evaluate the water
yielding potentials of existing roof catchments of residential and public
buildings in Egbeada, Imo state, Nigeria and to determine the optimum volume of
storage to satisfy demand at both household and multi-household levels. The
potential of the community for rainwater harvesting was assessed by subjecting
20 years of rainfall data to descriptive statistical analysis and application
of appropriate mathematical formulae to calculate available roof areas, design
population and water demand. Mass curve analysis and SimTanka simulation model
were used to determine the optimum storage to satisfy water demand at
the levels considered. The results of the statistical analysis shows that there
is a much lower risk that rainwater harvesting will not meet the minimum water
demand of the community. The mass curve
analysis shows that monthly demands of 6 m3 (25l/p/d), 8.4 m3 (35l/p/d)
and 9.6 m3 (40l/p/d) can be met from tank storages of 25 m3,
41 m3 and 44.4 m3, respectively at individual household
level. The SimTanka simulation result shows that at individual level, when
practiced as a complete water source, a daily water demand of 40l/p/d can be
satisfied optimally at 99.8% from a storage of 63.5 m3 all year round
and if practiced as a partial water supply option(only during the dry season) a
daily water demand of 60 l/p/d can be satisfied 100 % of the time from rain
water storage of 65.5 m3.However, at multi-household level only a daily demand of 15l/p/d can be
satisfied at 100% of the time from a storage of 7,200 m3. Greater
potential exists for rooftop rainwater harvesting at the individual household
level than at the multi - household level in Egbeada community.
Keywords: Design population, water demand, roof water yield, optimum storage
https://doi.org/10.33922/j.ujet_v8i2_5
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Published
Thursday, December 22, 2022
Issue
Vol. 8 No. 2, December 2022
Article Section
GENERAL
The contents of the articles are the sole opinion of the author(s) and not of UJET.
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