The pattern and daily total production of waste-water from domestic sanitary appliances is a subject area in which a very limited amount of research has been carried out, despite its need for rational and economic drainage design. This paper consists of an analysis of data from a small-scale diary survey of domestic wastewater production and a comparison with previously published data.
The diurnal variation of activity for each major appliance has been established to give both peak and average frequencies of use. Good correlation has been shown for average (daily) values with published water-supply data. Peak values were difficult to compare, but were probably lower than previously-reported data. The wash basin and kitchen sink were found to have two modes of discharge, namely: running to waste and emptying a full bowl. The former mode was the most common in both appliances, although, surprisingly, the volume of each type of discharge was found to be approximately the same. Tests on appliance discharge durations, volumes and flow rates were also carried out.