Average flow rate

Hi, It's been 6 months since you posted this, any responses? I see that the calculator is still the current one in LEED Credit library. The reference guide says: "The average flush rate for dual-flush toilets must be calculated as the average flush volume of one full flush and two reduced flushes, using a 1:2 (high fush:low fush) ratio." I cannot find any anddenda that this has been changed? It effects calculations a lot!   /Maria

Hi again! I now know what the problem is, it's not a bug! It’s just one of the common user mistakes (that I have done too). Could that have been your problem too? When you alter urinals from 100 % to 0 % the calculator changes. (We never have urinals in common projects here, that's why I forgot!) Good luck in your calculations! /Maria

Hm, I think they are reasoning like this: If there 10 occupants (50 % female and 50 % male). Toilets are 2 and 4 liters. 100 % of males have urinals as well.   They are saying that 2 out of 3 times the male would use the urinal (and only once the toilet for the “big” flush). The female however would use the toilet 3 times, 2 times she would use the “little” flush and once the “big” flush.   5 (males) x 1 (time per day) x 4 (liters per flush) + 5 (females) x 2 (times per day) x 2 (little flush) + 5 (females) x 1 (times per day) x 4 (big flush) gives 60 (liters per day) Divide by uses per day (5x1+5x2+5*1=20) gives 3 liters per flush.   So they are saying your weighted average is 3 l/flush for both the male and the female toilet, to enter further down in the calculation in the Excel in both female and male.   Or if you like the male flush is 4 l/flush because he only uses the “big” one. The female is 2,67 l/flush. But these numbers don’t fit into the calculator since the baseline is 6 l/flush regardless if you have urinals, males or females.   Does this make sense?   /Maria