1st International Conference on Rain Water Cistern Systems
Honolulu, Hawaii, USA - June 1982

Section 6: Related Topics

Page 377

Rain and Waste Water Reuse for Toilet Flushing: A Simulation Model

A. Fewkes & S.A. Ferris
Trent Polytechnic, UK

Introduction

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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