Old Town Coppell - Alley ConveyanceKeith,
Attached is the alley capacity calculation sheet from the Drainage Manual. In red is the capacity calculation for a 0.50% slope on a 10’ wide alley and a 0.50% slope on a 15’ easement/alley
conveyance. If we went with a 10’ alley, we’d need to allow for at least a 15’ easement conveyance.
Also, the capacity of a 15’ alley at a 0.50% slope is 2.81cfs. I think this would be sufficient for both alleys without the need to convey in an easement.
I’ll call you in a minute to discuss
Thanks,
Dan
Dan Prendergast, E.I.T., LEED Green Associate
URBAN PLANNING + DESIGN GROUP
Freese and Nichols, Inc.
1701 N. Market St., Suite 500
Dallas, Texas 75202
214-217-2216
www.freese.com
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