International Rainwater Cistern Systems Conference
Khon Kaen, Thailand
- January, 1987
Section B: Planning
Applicability of Roof Rainwater Cistern Systems in
Sahim Tekali and Mohammad Mahmood
Jordan University of Science and Technology
The potential for use of roof rainwater cistern systems
(RRWCS) in Jordan was investigated by analyzing the rainfall data for five
stations, selected to represent all rainfall variations in the country.
Daily and monthly rainfall data for 20 years were subjected
to computerized mass curve analyses For each year, maximum rainwater that can
be stored and the corresponding allowable consumption (demand) rate were
calculated and correlated with the annual rainfall, There were no observable
spreads neither for individual stations nor among the stations. Each
correlation was expressed by a linear relationship.
Storage capacities obtained from monthly data were less than
those from daily data by as much as 30%. From cost comparisons with
bottled-water, optimal cistern volumes were found to be equal to the maximum
storage capacities determined by the maximum annual rainfalls.
80% of the rainstorms in Jordan occur during the 4-month
period from November to March. On the basis of this observation, it is proven
that adjustment of the consumption rates at the end of rainy seasons would
improve usage efficiency of RRWC. systems.
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