HomeMy WebLinkAboutMisc.KLING ENGINEERING & SURVEYING
Consulting Engineers • Land Surveyors
4101 Texas Avenue, Suite A
Bryan, Texas 77802
Telephone 979/846 -6212
Fax 979/846 -8252
B.J. Kling, P.E., R.P.L.S.
S.M. Kling, R.P.L.S.
Post Office Box 4234
Bryan, Texas 77805
Memo: September 20, 2004
To: City of College Station
Development Engineering
Re: Rock Prairie Baptist Church Parking & Drive Aisle Improvements - Drainage Letter
From: Fred Paine
The site is an existing local church with existing parking and sidewalks. It includes a state
historical building monument. Due to the closing of a portion of Old Rock Prairie Road and
the future one way operation of the State Highway 6 access road, the church is proposing to
construct an alternate main entrance drive accessing Rock Prairie Road. Additional
proposed improvements include a 11 space parking area specifically for the older
members of the congregation.
This project is in the Lick Creek drainage basin. Total site area is 4.33 acres. Total area of
impervious improvements is 0.31 acres. A storm water runoff analysis of existing and
proposed conditions was conducted using the Rational Method and is summarized below.
CONDITION
Q2
(cfs)
Q10
(cfs)
Q25
(cfs)
Q100
(cfs)
Existing
10.4
14.2
16.2
19.1
Proposed
11.5
15.7
17.9
21.2
Change
1.1
1.5
1.7
2.1
*Refer to Sheet ST -3 of the Site Plans for computation
As shown, the increase in runoff ranges from approximately 1 cfs at the 2 year event to
approximately 2 cfs at the 100 year event. Due to the minor increase in proposed
conditions runoff, an exception to the detention requirement is requested. No adverse
effects on the existing site facilities or downstream facilities & landowners are anticipated.