HomeMy WebLinkAboutReponse to CommentsI (1/12/2009) Carol Cotter -RE: Creek Meadows Phase 1C
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"Rabon A. Metcalf, P.E." <rabon@rmengineer.com>
"'Carol Cotter"' <Ccotter@cstx.gov>
10/23/2008 8: 15 AM
RE: Creek Meadows Phase 1 C
GV Exhibit.pdf
Responses to your Engineering Comments #3:
1. Gate valve on main line approximately 460' SW and gate valve on main
line almost directly across the street. I have attached an PDF that
illustrates these locations;
2. There is very little bar-ditch upstream (approximately 200') that will
receive and convey runoff to this point. Runoff then is conveyed into the
bar-ditch and travels approximately 500' to 2-24" RCPs that carry runoff
under Green Prairie Road East. When I did my original study for Creek
Meadows -Section 1 A & 1 B I estimated that the crossing was significantly
oversized and that a single barrel 24" could adequately convey runoff. I
have not performed any tight engineering calculations on the capacity of the
ditch but using some rough estimates I believe the bar-ditch has sufficient
capacity (Q=AV where A=6 sq.ft. and V=3 fps therefore Q=18 cfs).
From this point runoff travels through the Creek Meadows drainage and
detention systems and to the taxed roadway culverts at Greens Prairie Trail
and Royder Road . I do not believe these undetained flows will amplify the
drainage problem for a couple reasons. (1) The detention system of Creek
Meadows reduced runoff below pre-development rates an amount greater than
this project's impervious cover increase, and (2) the detention system
accounted for full-development of all sections upstream of the ponds. There
are many sections that have not developed yet and therefore there is still
"room" for this runoff increase in the pond . Development of Section 1 C's
detention facility is planned to occur prior to all of the "original"
sections developing.
3. Sleeving is required for pressure pipe. No sleeving is required for
non-pressure pipe.
Rabon A. Metcalf, P.E.
RME Consulting Engineers
1391 Seamist Lane <77845>
P.O. Box 9253
College Station, TX 77842
PH: (979) 690-0329
FX: (979) 690-0329
MB: (979) 219-4174
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J (1/12/2009) Carol Cotter -RE: Creek Meadows Phase 1C
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-----Original Message-----
From: Carol Cotter [mailto:Ccotter@cstx.gov]
Sent: Wednesday, October 22, 2008 4:36 PM
To: Rabon Metcalf
Subject: Creek Meadows Phase 1 C
Rabon-
Attached are engineering comments for your revised submittal. You should be
receiving formal comments shortly.
Carol
Carol L. Cotter, P.E.
Development Engineer
City of College Station, Public Works
(979) 764-3570 Fax:(979) 764-3496
College Station. Heart of the Research Valley.
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