International Conference on Rain Water Cistern Systems
USA - June 1982
6: Related Topics
Rain and Waste Water
Reuse for Toilet Flushing: A Simulation Model
& S.A. Ferris
Trent Polytechnic, UK
The reuse of rain and domestic waste water for water closet flushing has an
effect on the water resources of a country: this conservation may have a particular
impact in areas where the carrier for the waste water is salt water or where the
potable water carrier is in short supply. In the United Kingdom, 30% of the, potable
water supplied to the domestic sector is used for the transportation of waste
water; however, the advantages of a reuse system are unlikely to be relevant here
because of the abundance of cheap potable water.
This paper considers two water closet [WC] supply systems: one is rain water
collected from the roof and the other combines rain and domestic waste water.
The stochastic nature of the rain and waste water time series have been simulated
using the Monte Carlo method. Subsequently, the operation o£ each system
is modelled to determine the percentage of WC water conserved per annum for a
range of tank capacities, roof area and family sizes.
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