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EMGAATS: Fix export of weir coefficients for DHI models #29

Open GoogleCodeExporter opened 9 years ago

GoogleCodeExporter commented 9 years ago
Weir coefficients are not being divided by (2g)^(0.5) = 8.02496, which is 
required according to the DHI documentation for weirs with specified 
coefficients.

DHI indicates their weir equation is

Q = CL*(2g)^(0.5)*H^(1.5)

where Q = flow, C = weir coefficient, L = weir length, g = grav const = 32.2 
ft/s, and H = head above weir crest

SWMM's weir equation, and on which our master data is based, is stated as

Q = CLH^(1.5)

Therefore, to use the equivalent C in DHI's equation, the C from our master 
data must be divided by (2g)^(0.5) to be equivalent.

Original issue reported on code.google.com by ArnelMan...@gmail.com on 29 Sep 2010 at 1:48