International Conference on Rain Water Cistern Systems
"Rainwater Catchment for Future Generations"
Keelung, Taiwan, R.O.C. - August 1991
3: Catchment and Storage System Designs
Investigation Into Feasibility
Of Usage For Domestic Use Of Collected Rain Water From Open Areas In Urban Regions
Shimizu Corporation, Japan
The purpose of this study is to examine the feasibility of collecting rain
water for reuse not only from roofs, but also open areas, such as park and public
lands. I examined the recovery rate and quality of collected rain water through
the use of permeable test pieces representing several types of ground compositions.
The results are as follows:
- The recovery rate of collected rain water ranges from 40-70% of the total
rainfall during the course of one year and these values depend upon the compositions
of the test pieces.
- The quality of collected rain water from non-fertilized test pieces satisfies
the Japanese flush water requirements for toilets, and it can be used for a wide
variety of purposes, including sprinkler systems.
- The collected rain water from fertilized test pieces contains a high concentration
of organic and inorganic substances during the first stages., so its reuse must
be restricted to plant cultivation.
However, during the last stages, its quality is almost equal to that of non-fertilized
test pieces, so it could be used for a wide variety of purposes.
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