HomeMy WebLinkAboutDrainage LetterKLING ENGINEERING & SURVEYING
Consulting Engineers • Land Surveyors
4101 S. Texas Avenue, Suite A
Bryan, Texas 77802
S.M. Kling, R.P.L.S.
Fred Paine, P.E., CFM
Memo:
Telephone 979/846 -6212
Fax 979/846 -8252
To: City of College Station, Engineering c/o Josh Norton
From: Fred Paine, P.E.
Re: Panera Bread Site Plan - Case file #11 00500095
Drainage Letter
Post Office Box 4234
Bryan, Texas 77805
July 18, 2011
Purpose: To address the Tributary to Burton Creek Culvert Crossing & existing structures with respect to
proposed fringe fill.
I. The Culvert Crossing was designed, permitted & approved through the City & FEMA accounting
for a fully filled floodway fringe for both sides of the Tributary (Ref.: FEMA LOMR Case No.
07- 06- 1928P). As indicated in the LOMR study, a fully filled floodway fringe creates a
calculated water surface elevation of 275.5 just upstream of the culvert structure. The top of the
roadway over this structure is at approximate elevation 282.5. No adverse impacts or increase in
water surface elevation above the calculated amounts are anticipated from the proposed fringe fill
& retaining wall.
II. The adjacent structures on April Bloom appear to range in finished floor elevation from 283 to 285
according to the City of College Station digital topography. As indicated in the above referenced
LOMR, a fully filled floodway fringe will not impact the April Bloom structures. Floodway
elevations in this reach range from 282.5 to 280.6. Attached are the results of a modified
floodway HEC -RAS run in which the proposed fill and wall were modeled by modifying sections
11 +60 through 15 +04 (right side fill only) with the remaining downstream floodway fringe fully
filled. The results were only slight increases in water surface elevation (none exceeding the
established floodway elevations) and a slight water spread at station 11 +60. The water spread did
remain on Block "Y ". No adverse impacts are anticipated from the proposed fringe fill &
retaining wall to the existing structures on April Bloom.
"or.
ALFRED A. PAINE
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