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Old 12-28-2012, 11:33 AM
Kiril Kiril is offline
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Join Date: Jun 2007
Location: District 9 CA
Posts: 18,208
Quote:
Originally Posted by RandalatA1Sprinklers View Post
I just went back in my books frfom the rb acedemy. we just touched on du and i had a note in my book saying they teach more about it in an auditors course.

DU= avg catch in the lowest quartile divided by the avg catch overall x 100

derived from the Coefficient of Uniformity (CU) formula

you are a pretty smart guy Kiril, where did you get all your knowledge? The auditors course is on my list of classes I want to take.

its stuff like this that makes me laugh when a homeowner thinks we just go throw pipe and heads in the ground and call it a sprinkler system.
DU doesn't necessarily have to be for the low quarter. It has been suggested the low half is a better value to use. These are the values I calculate for catch can audits with respect to DU and PR.

UCC
Cu
DU25
DU30
DU50
DU75
UCCw_ave
Cuw-ave
DUw_ave25
DUw_ave30
DUw_ave50
DUw_ave75
PRave
PR25
PR30
PR50
PR75
PRw_ave
PRw_ave25
PRw_ave30
PRw_ave50
PRw_ave75
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