The water consumption of a high rise apartment building with 60 dwelling units having an average household size of 5 persons is 135 lpcd

Q. The water consumption of a high rise apartment building with 60 dwelling units having an average household size of 5 persons is 135 lpcd. Assuming 80% of the total use is met with recycled water supply, the daily domestic demand for the building is_________litres.

Ans: 8100 to 8100

Sol:

Total dwelling units = 60.
Average household size = 5.
Thus, total population in building = 300.
Thus, total water consumption demand of the building per day = 135 lpcd × 300 = 40,500 liters.
It is given that, 80% of the total use is met with recycled water.
Thus, (80 ×100) × 40,500 = 32,400 liters demand is met with recycled water.
Thus, the net daily domestic demand of water of the building = 40,500 – 32,400 = 8100 liters.