If we were to calculate the average flush rate of a dual flush toilet (with urinals present in the space) we use the example average flow rate equation provided by USGBC in their Appendix A water calculation document:
[(male full flush uses*full flush rate) + (female full flush uses*full flush rate) + (female low flush * low flush rate)] / (male and female total uses/day)
Male full flush uses would be 1
Female full flush uses would be 1
Female low flush uses would be 2
Male and female total uses/day would be 4
If we do not have urinals, how does this equation change? Should we have the total male and female total uses as 6 rather than 4?
Would the final equation be the following:?
[(male full flush uses*full flush rate) + (female full flush uses*full flush rate) + (male low flush*low flush rate) (female low flush * low flush rate)] / (male and female total uses/day)
Male full flush uses would be 1
Female full flush uses would be 1
Male low flush uses would be 2
Female low flush uses would be 2
Male and female total uses/day would be 6
Thanks!
Carlie Bullock-Jones
PrincipalEcoworks Studio
LEEDuser Expert
220 thumbs up
August 19, 2013 - 11:52 am
yes, your dual-flush weighted average calculations outlined above (with and without urinals) are correct.
Mike D
56 thumbs up
August 19, 2013 - 12:00 pm
Thanks Carlie!
So if I have a dual-flush WC without urinals of 1.19/0.79 this would give me a weighted average of 0.92?
Are weighted averages of a specific dual flush toilet higher or lower when urinals are present?
Carlie Bullock-Jones
PrincipalEcoworks Studio
LEEDuser Expert
220 thumbs up
August 19, 2013 - 12:10 pm
Yes, if you have a 1.19/0.79 gpf dual-flush water closet, this would equal the following weighted averages:
- 0.92 gpf without urinals
- 0.99 gpf with urinals
Subrota Roy
October 15, 2020 - 9:58 am
For Duel cistern flush system if one flush is 4 liter and another flush is 6 liter, then average flow rate is =
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