If local code permits, what types of water should be used for flushing toilets?(

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试卷: LEED GA模拟题F[查看]
If local code permits, what types of water should be used for flushing toilets?(choose 2)


A: Dishwasher water
B: Stormwater
C: Well water
D: Graywater

参考答案: BD

本题解释:
A Dishwasher water is considered blackwater (by most jurisdictions), and cannot be used without being treated first. Local code will define blackwater, however it is almost 100% likely no local code will allow dishwater to be used for flushing toilets, regardless if the local code defines the dishwater as blackwater or not.

Waste water from toilets and urinals is considered blackwater and cannot be used for irrigation (unless it has been treated first).
B Stormwater can be collected in cisterns and used for flushing purposes if local code allows it.
C Well water is potable water. LEED rewards projects for reducing potable water use.
D Graywater is defined by the Uniform Plumbing Code (UPS) as untreated house-hold wastewater which has not come into contact with toilet waste or kitchen sinks.

Some states and local codes have other definitions.

Graywater includes used water from bathtubs, showers, bathroom wash basins, and water from clothes-washer and laundry tubs.