Which of the following is the best strategy for conserving potable water?

Categoriesknowledge Base

A)Installing a bioretention pond
B)Installing an onsite water treatment plant
C)Increasing the infiltration of runoff
D)Installing a dual flush toilet


The right answer is D. 

  • A dual flush toilet has two different flow rates depending on the type of waste. The common flow rates of dual flush toilets 6 litres for full flush and 3 litres for half flush. Full flush is used to flush solid waste and half flush is used for liquidwaste. Generally, 2/3rd times the toilet is used for liquid flush. Hence dual flush toilets save significant amount of potable water compared to a standard 6 litres per flush toilet
  • A bioretention pond helps with rainwater management by slowing the rate at which rainwater leaves the location.
  • An onsite waste water treatment reduces the load on municipal waste water treatment plant but doesn’t reduce potable water use. However, if the treated wastewater is used for toilet flushing. It reduces the potable water use. In this case we do not know if treated waste water is used for toilet flush
  • Increasing the infiltration of runoff doesn’t reduce potable water use. It only reduces the storm water runoff

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