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Example 2
Calculation of non-potable water requirement
* * daily requirement of non-potable water in a 4-person household:
* Toilet flushing
30 litres / person x 4 people =
120 litres
* Washing machine
10 litres / person x 4 people =
40 litres
* Garden irrigation
1 litre / person x 4 people =
4 litres
=> Total non-potable water requirement per day:
164 litres
=> Annual requirement:
164 litres/day x 365 days =
60 m³
When compared with the rainwater yield of 59 m³ determined in Example 1 for a single-family house, it is seen that almost the total requirement of the toilet, washing machine and garden can be covered by the average rainwater yield.