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# Thread: Tough question on LEED test

1. ## Tough question on LEED test

Encountered this question of the LEED NC exam, and still cannot figure out the answer.

A womans bathroom has one dual flush toilet, and two low flow toilets. what is the daily usage per woman?

a. 1 dual flush, 2 low flow. 3 lavatories
b. 2 dual flush, 2 low flow, 4 lavatories
c.d. etc, etc. (just a different combination of numbers)

Any help??

Do you calculate a dual flush twice??

2. Isn't there a calculation for that in the LEED NC v2.2 guidebook?

3. yes, there is, but it doesnt explain whether or not to calc the dual flush twice or once. plus, the format of the question doesnt make too much sense.

4. For calculating total water consumption in your design case:
2/3 of the time you are using the low-flush (#1)
1/3 of the time you are using the full-flush (#2)

Dual-flush toilets are generally only installed in women's waterclosets, as men's waterclosets have full-flush toiletes (1.6gpf) and either 1-pint or waterless urinals.

5. 1 dual flush, 2 low flow. 3 lavatories

Not to be crude, well ok...1 poop, 2 pee

6. Originally posted by jaruss01
A womans bathroom has one dual flush toilet, and two low flow toilets. what is the daily usage per woman?

a. 1 dual flush, 2 low flow. 3 lavatories
b. 2 dual flush, 2 low flow, 4 lavatories
c.d. etc, etc. (just a different combination of numbers)
Is that the EXACT wording of the question?

What are the options for c.d. etc, etc.?

What are assumptions are being made about the women's demographics and their bathroom usage? (This can be unbelievably complicated.)

I think that the real answer is "insufficient information."

7. For LEED purposes, the reference manual tells you how to make your assumptions.

You assume 50/50 male/female (unless you have a valid reason not too, like an all-boy school).

You assume 3 uses per day (1 at 1.6 gpf, 2 at 1.0 gpf)

8. Thank you for the info, Jeff.
Originally posted by Jeff
You assume 3 uses per day (1 at 1.6 gpf, 2 at 1.0 gpf)
^^This assumption on the part of LEED is so inaccurate for women that it's not funny, but I guess that's for another topic. Are those guidelines just for exam purposes, or will LEED accredited professionals always be using them?

9. Any assumption you make for the test, applies to real life credit submittal.

Do you have a copy of the reference guide? These assumption are outlined in there.

10. Jeff, you seem to have great LEED expertise; how do you account for this answer:
Originally posted by Jeff
Not to be crude, well ok...1 poop, 2 pee
Not to be crude, well ok... wouldn't it be 3 female urinations, since that very often happens in tandem with a female defecation in a double flush? (Please, folks, I'm serious!)
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Originally posted by Jeff
Any assumption you make for the test, applies to real life credit submittal.

Do you have a copy of the reference guide? These assumption are outlined in there.
I don't have a copy, but you can be sure that I'll get one and become well-versed in the assumptions. Not because I need to pass a LEED test, but because... well... the reasons are off-topic.

Off-topic:
 The assumptions LEED is making about women's bathroom habits are a disaster waiting to happen, and if there's anything I can do to help change them... (That is, the assumptions.)