QUALITATIVE AND QUANTITATIVE ASSESSMENT OF RAINWATER HARVESTING FROM ROOFTOP CATCHMENTS: CASE STUDY OF OKE-LANTORO COMMUNITY IN ABEOKUTA, SOUTHWEST NIGERIA
DOI:
https://doi.org/10.51406/jagse.v10i2.1104Keywords:
roof patterns, harvesting, water quality, potable, rain.Abstract
Quantitative and qualitative assessment of Rainwater harvesting system from rooftop runoff from acatchment at Oke-Lantoro Community in Abeokuta, Southwest Nigeria was determined using eightroof designs in respect to slope and six selected roofing sheet materials respectively. The resultshowed that the steeper the roof slope the more the rainwater harvested irrespective of rainfall amountand duration. The roof pattern with a large and steep slope designed with gutter tends to harvest morewater and at a higher rate. Physico-chemical analysis of the harvested water samples gave resultswhich varied from various drinking water quality regulatory standards. Sample from galvanized roofingsheet was influenced by zinc and lead in quantity beyond human consumption level, while the asbestosroofing sheet water sample gave higher calcium and magnesium contents which reflected in thetotal hardness value. Sample from the aluminum roofing sheet gave the best result but it was alsoaffected by the influence of atmospheric dust particles and faecal materials of birds, lizards and othersmall organisms. Considering the results of the physico-chemical tests, the harvested water samplescould be put to other domestic uses, as they cannot be consumed directly.References
Ayeni, H.B. 1994. “A study of chemical
characteristics of shallow wells and streams
in Abeokuta,” unpublished B. Sc project report,
University of Agriculture, Abeokuta. P.
13-14.
Ayoade, J.O, Iwayemi, A., Akintola, F.O.
1998. “Urban Water Supply and Demand in
Nigeria in an Era of Economic Liberalization”.
Agroclimatology. Ibadan.: Vantage Publishers.
P. 1-4.
Fatokun, J. 2004. “Water for Agricultural
Communities”. P. 31-32.
Food and Agricultural Organization
(FAO). 2007. “Report on water and sanitation
in Africa”.
Gould J., Nissen-Petersen E. 1999. Rainwater
catchment systems for domestic rain:
design construction and implementation.
Intermediate Technology Publications, London:
335 p.
Gould, J. 1999. “Contributing paper; Contributions
Relating to Rainwater Harvesting”
http://www.rainwaterharvesting.org/urban/
urban.htm.
König, K. 1998, Rainwater in Cities, Ecological
Concepts, fbr, Kassler Str. 1a, D-
60486, Frankfurt am Main, Germany. P.
233-241.
Ragab, R, Bromey, J, Roser, P, Cooper,
J.D., Cash, H.C. 2003 “Experimental study
water fluxes in a residential area: rainfall,
roof run off and evaporation, the effect of
slope and aspect.” Journal of Hydrological Process,
17: 2409-2422.
characteristics of shallow wells and streams
in Abeokuta,” unpublished B. Sc project report,
University of Agriculture, Abeokuta. P.
13-14.
Ayoade, J.O, Iwayemi, A., Akintola, F.O.
1998. “Urban Water Supply and Demand in
Nigeria in an Era of Economic Liberalization”.
Agroclimatology. Ibadan.: Vantage Publishers.
P. 1-4.
Fatokun, J. 2004. “Water for Agricultural
Communities”. P. 31-32.
Food and Agricultural Organization
(FAO). 2007. “Report on water and sanitation
in Africa”.
Gould J., Nissen-Petersen E. 1999. Rainwater
catchment systems for domestic rain:
design construction and implementation.
Intermediate Technology Publications, London:
335 p.
Gould, J. 1999. “Contributing paper; Contributions
Relating to Rainwater Harvesting”
http://www.rainwaterharvesting.org/urban/
urban.htm.
König, K. 1998, Rainwater in Cities, Ecological
Concepts, fbr, Kassler Str. 1a, D-
60486, Frankfurt am Main, Germany. P.
233-241.
Ragab, R, Bromey, J, Roser, P, Cooper,
J.D., Cash, H.C. 2003 “Experimental study
water fluxes in a residential area: rainfall,
roof run off and evaporation, the effect of
slope and aspect.” Journal of Hydrological Process,
17: 2409-2422.
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