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WAT 02 - Water efficient equipment: toilets

Effective Flush Volume (EFV) example calculation - KBCN1411

Effective flush volume (EFV) is the volume of water needed to clear the toilet and transport any contents far enough to avoid blocking the drain. The effective flush volume of a single flush toilet is the volume of water used for one flush.   The effective flush volume of a dual flush toilet is the ratio of full flush to reduced flush. This is taken to be one full flush for every three reduced flushes for non-residential buildings.   The effective flush volume would therefore be calculated as follows, using a 1.6/1.28 gallon dual flush volume toilet as an example:   

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