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FS8601-CS 860709
BROCKE1 i E • DAVIS • DRA KE consulting engineers ,inc.. July 9, 1986 Mr. Fernando Pasquel Dewberry & Davis 8401 Arlington Blvd. Fairfax, Virginia 22031 Re: Denton Creek, Coppell, Texas BDD Project No. C8511 Dear Mr. Pasquel: This letter is in response to a letter dated April 21, 1986, from John L. Matticks of the F.I.A. regarding our re -study of Denton Creek in Coppell, Texas (IA -RA -RS 316A 18), Case 86- 06 -13R. The following responses refer directly to the questions voiced in that letter. We have modified our sheet 2 of 6 which shows the delineation of the 100 -year flood to show both existing and proposed conditions. We have also shown the existing floodway boundaries and our calculated proposed encroachments. The discrepancies in WSEL's between our existing conditions and the published FIS are due to two modifications. First of all, the addition of several cross sections to the model in the area of our proposed development causes the WSEL to differ from the original FIS. Secondly, we previously obtained a copy from FEMA of an approved flood study by Dannenbaum Engineers of Dallas, Texas. This study was for the Campbell Ranch project immediately downstream of our project. It was our understanding from discussions with your office that we should utilize this study to derive our proposed starting WSEL while using the FIS water surface for our existing conditions WSEL. As per yur however, we have modified our existing conditions to start with the obtained from the Dannenbaum study, so that both existing and proposed conditions in our study reflect the downstream improvements now under construction. We utilized standard HEC -2 modeling techniques in orienting our cross sections. As can be seen from our plotted cross sections, the small channel to the right is Cottonwood Creek, as it is also included in the original FIS cross sections through station 35170 (Section M). In the original FIS however, the additional discharge from Cottonwood Branch is subtracted out at cross section 32250 and flow is also allowed in the overbank area below the bank elevation. For our revised study, we have maintained the total discharge from both creeks up to our cross section 33145 at which point the flows split. We have also maintained the flow within the channel of Denton Creek upstream of this point due to natural "levees" along the channel. Civil & Structur Engineering • Surveying 3535 Travis, Suite 100 • Dallas, Texas 75204 • (214) 522 -9540 Mr. Fernando Pasquel July 9, 1986 Page Two These changes have altered our previous Floodway calculations, and these revised calculations are also forwarded herewith. On the accompanying Exhibit "A ", it can be seen that the Floodway as calculated by Dannenbaum and that of the original FIS differ greatly in the area of the subject development. It appears from our examination of the original FIS computer runs that no encroachment calculation was made for cross section 32780. This is evidenced in the unusual "bump" in the FEMA Floodway on the left overbank at this point. The Dannenbaum Floodway is obviously more consistent with standard methods of encroachment calculations. However, their calculation of STENCR for cross section 32780 places the encroachment in the middle of the common floodways of Cottonwood and Denton Creeks. This calculation must be interpreted liberally in the actual drawing of the Floodway on the FEMA maps. For our calculations, since we have maintained the combined discharge up to Section 33145, the encroachment calculations are for both streams. Exhibit "B" shows the location of our calculated floodway. Note our judgement of how the floodway of Cottonwood Branch and Denton Creek should be blended. This could be subject to information on Cottonwood Branch that is outside the scope of our study. Through the modifications we have made, we have tried to maintain both compliance with standard calculation methods and the spirit of the purpose of Floodway designation. Please note that our calculated Floodway location is not strictly along our "Proposed Non - Enroachment Line" but it is at no location beyond the non - encroachment line. Due to the lowered water surfaces from the proposed improvements downstream, a greater portion of the area between Denton Creek and Cottonwood Branch is technically no longer in the flood plain. However, since it is a low flat area and has been eliminated from the flood plain by only fractions of a foot in some cases, as well as its being a park and natural area for the most part, we are not recommending its reclamation or its elimination from the FEMA flood hazard or Floodway area. Since these studies are based on "existing" hydrologic conditions, it must be kept in mind that a future re- evaluation of the watershed upstream could place the area back in the technical flood hazard area once again. Mr. Fernando Pasquel July 9, 1986 Page Three We have included the additional supportive data that you have requested, and this data reflects any minor revisions that we have made since our last submission. please note that we have not revised plan sheet 1 of 6 since it has no particular bearing on the case. If you should have any questions, please do not hesitate to call. Ver tr ly�s, Mark W. Roberts, P.E. Enclosure /dj EXIST. PROP. Q VEL. W.S.100 Q VEL. W.S.100 X -SECN. (CFS) (FPS) (ELEV.) (CFS) (FPS) (ELEV.) 32250 21,300 8.97 459.29 21,300 8.97 459.29 32305 21,300 13.49 458.57 21,300 13.49 458.57 32725 21,300 4.74 462.07 21,300 3.72 461.83 33145 14,900 8.07 462.03 14,900 3.59 462.03 33470 14,900 2.26 463.26 14,900 4.31 462.29 34260 14,900 4.21 463.41 14,900 2.97 463.09 34850 14,900 7.78 463.54 14,900 8.09 463.15 34950 14,900 3.98 464.53 14,900 4.42 464.20 35170 14,900 2.48 464.73 14,900 2.66 464.46 36970 15,600 5.10 465.59 15,600 5.24 465.45 39440 15,600 5.97 467.84 15,600 6.00 467.81 A/f4 t(' „„ : kr) - -i I , 1 . . 04 ititv,ENi, ijri 1/ .." . 1 . crtc;?, Lri N .,... '7:1---: \ \ 1 , f ..-----> i . 7 — E % , 1 1 , p.--np/ ED , Loopi.J4 Y K.._ . . ... - ...., ,, ( Sr ) Q - C ...\ ••:-- \ \\ ,i _ .. 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