A new construction office project will install high-efficiency toilets, that are

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试卷: LEED AP BD+C模拟题A[查看]
A new construction office project will install high-efficiency toilets, that are pressure assisted and
use 1 gallon per flush, waterless urinals, and aerated faucets that use 0.25 gallons per minute. The
office project will have 400 full time occupants with 100 part time occupants working 245 days
per year. The project will have a rainwater collection system that can provide 4,000 gallons
monthly for sewage conveyance. What is the design case total sewage generation?
A: 193,172 gallons
B: 216,500 gallons
C: 172,500 gallons
D: 220,500 gallons

参考答案: C

本题解释:
Notes:
:

First, find FTEs.:

400 + (100 part time workers/2) = 450 FTEs:

If part time is stated in hours such as 3 hour per day, then divide the number of hours by 8 to
determine FTE numbers. But if not stated, assume 4 hours per day or .5 FTE.:

No data is given on gender, so assume 50% male and 50% female.:


225 Women = 3 uses of WC per day * 1 gallon per flush = 675 gallons

225 men = 1 use per day * 1 gallon per flush + (2 uses per day * 0 gallons for waterless urinals) =
225 gallons

This question refers to sewage convenience, so there is no need to add in faucet calculations.

(675+225) * 245 work days per year = 220,500 gallons per year

Then subtract the water provided by the rainwater collection system.

4,000 gallons per month or 48,000 gallons per year

220,500-48,000 = 172,500 gallons is the design case amount.