Four Seasons 2R-CS050217Keith Darvin - BEE: Royal and ~ndy Lake ' page 1
From:
To:
Date:
Subject:
Keith,
"Jack Evans" <jevans@pkce.com>
"Keith Marvin PE. (E-mail)" <kmarvin@ci coppell.tx.us>
2/17/2005 6:52:03 AM
BCE - Royal and Sandy Lake
I have looked at the existing drainage that goes to the existing curb inlet located in our proposed drive in
Royal. Existing, there is less that 1 0 acre that contributes to the curb inlet. I looked at just knocking off
the top of the curb inlet and replacing with a 4-grate inlet (traffic loaded) A four grate has a capacity of 10
cfs at 0.5 foot of head. Based on 0 98 acres contributing and a C value of 09 (which is probably a little
high for just a road) we can expect 7.4 cfs in a 100-year storm.
Based on this information I am going to ask that we just modify the existing inlet in lieu of modifying and
adding another inlet that would only pick up less than 4 cfs (half of the contributing area - depending on
what side it is located).
If this solution is reasonable to you, we will revise the plans accordingly and submit to you for approval.
Sincerely,
Jack
C. Jack Evans, P.E.
Associate
Pacheco Koch Consulting Engineers
8350 North Central Expressway, Suite 1000
Dallas, Texas 75206
ph: (972) 235-3031
fax: (972) 235-9544
CC:
"Norman Coates (E-mail)" <hardyl@airmail net>