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Eastlake-SY130708 July 8, 2013 Mr. Michael Garza, P.E. Civil Engineer City of Coppell 12750 Merit Drive 255 Parkway Boulevard Suite 1000 Coppell, Texas 75019 Dallas, Texas 75251 Re: Response to Comments – June 12, 2013 Easthaven Residential Development CLOMR Denton Creek Dear Mr. Garza: This letter addresses comments received from Halff Associates, I dated June 12, 2013, in regard to the above referenced CLOMR. O to the comments are as follows. The floodway location at cross section 350+82 shown on the Comment 1: floodplain and floodway workmaps should be verified with the HEC and checked for consistency. Please revise and resubmit. The right encroachment for cross section 350+82 was updated in b existing and proposed HEC-RAS models. The modeling and floodpla workmaps were updated accordingly and are attached for your refe Please verify the floodplain and floodway top width in the HEC- Comment 2: RAS model for proposed conditions at cross section 354+84. The f topwidth should be equal to or less than the floodplain top widt and resubmit. The encroachments for cross section 354+84 were updated in the p condition HEC-RAS model. The modeling and floodplain workmaps w updated accordingly and are attached for your reference. The following comments concerning valley storage need to be Comment 3: addressed. a.The report states that based on a comparison of calculations gen by Civil 3D from existing to proposed condition a net gain in va storage of 28 acre-feet occurs due to the proposed project. For conditions, was the volume below the normal pool elevation (461. of the proposed pond included in the Civil 3D calculations? If s revise the valley storage calculations to exclude the amount of below the normal pool elevation in the pond and resubmit. TEL 972 770 1300 FAX 972 239 3820 Mr. Michael Garza, P.E., July 8, 2013 b.Be advised that based on a comparison of volumes generated by th submitted HEC-RAS for both revised existing and proposed conditi that a loss in valley storage occurs to the proposed project. Th accounts for volume reduction due to inundation reduction and no the earthwork calculations per the Civil 3D calculations discuss previous comment. Based on these HEC-RAS volumes, the reduction valley storage exceeds that which is allowable according to the Coppell Floodplain Management Ordinance. Please revise the valle storage calculations to include the volumes due to earthwork and inundation reduction combined. KHA evaluated the difference in valley storage between pre-devel proposed conditions for the combined Westhaven and King’s Lake d using HEC-RAS. The pre-developed condition is defined as existin per the Westhaven CLOMR (Case Number 12-06-3818R). The respecti model from the Westhaven CLOMR was used to determine pre-develop storage volume. The proposed condition is defined as the develo sites. Table 1 below summarizes the pre-developed and proposed cumulati comparison using HEC-RAS. Table 1: Pre-Developed and Proposed 100-Year Valley Storage Anal Cumulative Volume River Station (ac-ft) Pre-Pre- ProposedProposed DevelopedDeveloped 394+36394+36812.8765.2 349+50349+50216.0216.0 Volume within project 596.8549.2 limits: Volume Reduction = 8.0% The City Floodplain Ordinance states projects may decrease the 1 floodplain storage by 15% if the drainage area associated with t less than 100 square miles. According to the FEMA Flood Insuran drainage area of Denton Creek downstream of Grapevine Lake is 10 miles at the project area. Based on the HEC-RAS output for both anticipated valley storage loss from pre-developed to proposed c KHA did not revise the proposed grading or the proposed conditio model from the previous submittal. A copy of the pre-developed W CLOMR HEC-RAS model is attached for your reference. A forthcoming memorandum will be sent to the City briefly discus storage is met between the combined Westhaven and King’s Lake developments. Both property owners have acknowledged and approv valley storage evaluation which will be included with this memor K:\DAL_Hydro\069308201-Cummings Tract\Docs\Comment Response Lett Mr. Michael Garza, P.E., July 8, 2013 I trust the above responses and the updated attachments are suff Mr. Erskine’s comments. If you have no further comments, please appropriate location on FEMA Form 1 and return it to me. A scan the signed form is sufficient. If you do have additional questi please do not hesitate to contact me at (972) 770-3024 orkate.hagan@kimley- horn.com. Sincerely, KIMLEY-HORN AND ASSOCIATES, INC. Kate E. Hagan, P.E. cc:Russell P. Erskine, P.E., CFM; Halff Associates, Inc. Mark Harris, P.E.; Kimley-Horn and Associates, Inc. Kyle Dickey, P.E.; Kimley-Horn and Associates, Inc. Attachments: Updated Report Pages 12 and 13 Updated FEMA 100-Year Floodplain and Floodway: Revised Existing Updated FEMA 100-Year Floodplain and Floodway: Proposed Conditio Updated Revised Existing Condition FEMA Regulatory Floodplain Wo Updated Proposed Condition FEMA Regulatory Floodplain Workmap Digital Files: Updated Digital Model Summary Table Updated HEC-RAS models “RevEx_FEMA FW” and “Prop_FEMA FW” Westhaven CLOMR Case Number 12-06-8616R HEC-RAS model Updated CAD File – xFloodplain.dwg K:\DAL_Hydro\069308201-Cummings Tract\Docs\Comment Response Lett DC–K’LRD ENTONREEKINGSAKEESIDENTIALEVELOPMENT CLOMRSJ2013 UBMITTALUNE The results indicate that there are no increases in 100-year wat within the subject reach. Output from the fully developed hydra in Appendix E. 5.4VS ALLEYTORAGE KHA evaluated the difference in valley storage between pre-devel conditions for the combined Westhaven and King’s Lake developmen RAS. The pre-developed condition is defined as existing conditio CLOMR (Case Number 12-06-3818R). The respective RAS model from CLOMR was used to determine pre-developed valley storage volume. Table 5 summarizes the pre-developed and proposed cumulative vol using HEC-RAS. Table 5: Pre-Developed and Proposed 100-Year Valley Storage Anal Cumulative Volume River Station (ac-ft) Pre-Pre- ProposedProposed DevelopedDeveloped 394+36394+36812.8765.2 349+50349+50216.0216.0 Volume within project 596.8549.2 limits: Volume Reduction = 8.0% The City Floodplain Ordinance states projects may decrease the 1 storage by 15% if the drainage area associated with the floodpla square miles. According to the FEMA Flood Insurance Study, the Denton Creek downstream of Grapevine Lake is 10.3 square miles a Based on the HEC-RAS output for both conditions, the anticipated from pre-developed to proposed condition is 8%. As mentioned in the response to comment letter KHA prepared for Westhaven CLOMR submittal, KHA acknowledges that the City of Cop Ordinance indicates that valley storage must be computed for the Flood (SPF). KHA reviewed readily available information for Den the “City-wide Storm Water Management Study,” but was unable to associated with the SPF for Denton Creek. KHA also followed up regarding this comment for the Westhaven development. During th indicated that the Floodplain Ordinance requirement was probably development along the Elm Fork of the Trinity River. With the l 5.0 Fully Developed Condition 12 K:\DAL_Hydro\069308201-Cummings Tract\Docs\CLOMR Report.docx Copyright © 2013 Kimley-Horn and Associates, Inc. DC–K’LRD ENTONREEKINGSAKEESIDENTIALEVELOPMENT CLOMRSJ2013 UBMITTALUNE regarding the SPF flow, he recommended not performing the SPF va analysis. Therefore, KHA is requesting that the SPF valley stor dismissed for the King’s Lake development as well. 5.0 Fully Developed Condition 13 K:\DAL_Hydro\069308201-Cummings Tract\Docs\CLOMR Report.docx Copyright © 2013 Kimley-Horn and Associates, Inc. HEC-RAS Plan: RevEx_FEMA FW River: RIVER-1 Reach: Reach-1 ReachRiver StaProfileQ TotalMin Ch ElW.S. ElevCrit W.S.E.G. ElevE.G. SlopeVel ChnlFlow AreaTop WidthFroude # Chl (cfs)(ft)(ft)(ft)(ft)(ft/ft)(ft/s)(sq ft)(ft) Reach-156940100-Year9400.00449.00474.51463.46474.790.0006685.063394.521466.070.22 Reach-156940100-Year FW9400.00449.00475.42463.46475.730.0006325.052666.79633.080.21 Reach-155590100-Year9400.00452.40473.26464.59473.680.0010605.813106.141414.850.27 Reach-155590100-Year FW9400.00452.40474.12464.59474.620.0010976.062248.60596.080.27 Reach-153350100-Year9400.00448.00472.58459.18472.700.0002163.295342.702203.350.13 Reach-153350100-Year FW9400.00448.00473.33459.18473.480.0002603.573737.23895.140.14 Reach-151350100-Year9400.00446.50472.02457.46472.100.0004872.625017.941440.440.17 Reach-151350100-Year FW9400.00446.50472.56457.46472.710.0006803.233257.63600.000.21 Reach-148000100-Year9800.00445.60470.74460.64470.830.0002883.336287.741543.560.14 Reach-148000100-Year FW9800.00445.60471.25460.64471.340.0002613.246169.541300.000.14 Reach-140650100-Year10200.00440.00468.17455.66468.420.0005604.743625.07824.630.20 Reach-140650100-Year FW10200.00440.00468.78455.66469.060.0005484.803178.68499.000.20 Reach-139940100-Year15400.00442.00467.01458.99467.750.0013717.823108.87615.130.32 Reach-139940100-Year FW15400.00442.00467.57458.99468.380.0013778.002742.61400.000.32 Reach-139540100-Year15400.00442.00466.26458.83467.100.0017567.952780.74585.390.36 Reach-139540100-Year FW15400.00442.00466.73458.83467.700.0018298.292346.78386.500.37 Reach-139490100-Year15600.00442.00466.39457.02466.830.0011515.383115.01377.040.29 Reach-139490100-Year FW15600.00442.00466.96457.02467.340.0009855.063332.12389.360.27 Reach-139436100-Year15600.00443.54466.21457.66466.740.0008306.723479.58631.680.29 Reach-139436100-Year FW15600.00443.54466.75457.66467.260.0007486.523450.49430.000.27 Reach-139281100-Year15600.00439.81465.93455.40466.560.0010866.933060.99665.520.32 Reach-139281100-Year FW15600.00439.81465.96455.41466.950.0014708.072120.78303.770.37 Reach-138988100-Year15600.00440.24465.89455.20466.200.0004654.813966.42766.340.21 Reach-138988100-Year FW15600.00440.24466.06455.20466.400.0004864.943689.53575.570.22 Reach-138781100-Year15600.00437.90465.88455.46466.090.0003624.294654.76789.760.19 Reach-138781100-Year FW15600.00437.90466.00455.46466.290.0004594.853896.56603.340.21 Reach-138573100-Year15600.00439.99465.86455.29466.010.0002413.174938.66785.270.15 Reach-138573100-Year FW15600.00439.99465.99455.29466.190.0002893.484432.68646.900.16 Reach-138381100-Year15600.00440.95465.84453.62465.970.0001763.185481.30765.420.13 Reach-138381100-Year FW15600.00440.95465.97453.62466.130.0002093.494960.94635.070.14 Reach-138194100-Year15600.00437.63465.73455.52465.920.0002963.614527.28715.720.17 Reach-138194100-Year FW15600.00437.63465.83455.52466.070.0003844.133957.23571.020.19 Reach-137969100-Year15600.00437.61465.63454.70465.850.0003533.964206.04674.360.18 Reach-137969100-Year FW15600.00437.61465.74454.70465.990.0003914.193936.95576.280.19 Reach-137787100-Year15600.00438.68465.35455.39465.750.0006085.824251.70994.540.24 Reach-137787100-Year FW15600.00438.68465.49455.39465.890.0005915.774136.85900.000.24 Reach-137727100-Year15600.00438.44465.31455.73465.690.0009055.864268.531064.460.28 Reach-137727100-Year FW15600.00438.44465.45455.73465.830.0008925.864177.11972.000.28 Reach-137718Bridge Reach-137702100-Year15600.00438.36465.23455.65465.650.0008396.114290.141074.590.28 Reach-137702100-Year FW15600.00438.36465.37455.65465.780.0008116.054250.58990.000.27 Reach-137539100-Year15600.00437.53465.06454.10465.540.0007406.414387.701081.020.26 Reach-137539100-Year FW15600.00437.53465.22454.10465.680.0007056.294409.721005.000.25 Reach-137350100-Year15600.00440.19465.03456.38465.390.0007695.564646.931161.330.26 Reach-137350100-Year FW15600.00440.19465.21456.38465.540.0007105.394794.941119.000.25 Reach-137201100-Year15600.00439.47465.01458.82465.250.0007314.414858.871128.570.25 Reach-137201100-Year FW15600.00439.47465.19458.82465.410.0006714.274996.271100.730.24 Reach-136990100-Year15600.00438.45465.00453.89465.140.0002192.645906.391228.510.14 Reach-136990100-Year FW15600.00438.45465.17453.89465.310.0002072.605973.171174.000.14 Reach-136837100-Year15600.00437.35464.98452.83465.100.0001992.636165.771125.170.13 Reach-136837100-Year FW15600.00437.35465.15452.83465.270.0001972.646088.741037.000.13 HEC-RAS Plan: RevEx_FEMA FW River: RIVER-1 Reach: Reach-1 ( ReachRiver StaProfileQ TotalMin Ch ElW.S. ElevCrit W.S.E.G. ElevE.G. SlopeVel ChnlFlow AreaTop WidthFroude # Chl (cfs)(ft)(ft)(ft)(ft)(ft/ft)(ft/s)(sq ft)(ft) Reach-136542100-Year15600.00437.17464.87453.05465.040.0002313.235088.88927.280.15 Reach-136542100-Year FW15600.00437.17465.03453.05465.210.0002313.254938.70826.000.15 Reach-136465100-Year15600.00436.06464.87450.28465.020.0001743.185268.53784.870.13 Reach-136465100-Year FW15600.00436.06465.03450.28465.190.0001733.195125.53694.850.13 Reach-136248100-Year14900.00438.23464.62456.14464.940.0006665.433885.61735.060.25 Reach-136248100-Year FW14900.00438.23464.71456.15465.100.0007545.793392.99568.980.26 Reach-136238Bridge Reach-136228100-Year14900.00438.34464.59456.10464.890.0006625.273980.73747.620.25 Reach-136228100-Year FW14900.00438.34464.69456.10465.050.0007445.603479.32580.130.26 Reach-136034100-Year14900.00439.29464.53451.87464.790.0003564.344689.33709.910.19 Reach-136034100-Year FW14900.00439.29464.67451.87464.930.0003544.364510.79575.000.19 Reach-135838100-Year14900.00435.75464.39450.51464.700.0004914.804284.83734.420.22 Reach-135838100-Year FW14900.00435.75464.50450.51464.840.0005134.933937.50560.000.22 Reach-135614100-Year14900.00437.29464.15450.90464.560.0006875.513910.28857.260.26 Reach-135614100-Year FW14900.00437.29464.26450.90464.700.0007005.593653.62676.000.26 Reach-135484100-Year14900.00435.85464.12454.76464.420.0007974.965646.721781.210.27 Reach-135484100-Year FW14900.00435.85464.12454.76464.570.0010505.693833.82748.000.30 Reach-135082100-Year14900.00435.46463.76451.35464.140.0006385.234258.301803.100.25 Reach-135082100-Year FW14900.00435.46463.86451.35464.250.0006325.224140.55730.920.25 Reach-134950100-Year14900.00439.30463.31455.97463.980.0014466.832467.46555.420.36 Reach-134950100-Year FW14900.00439.30463.46455.97464.090.0013396.632553.55556.000.35 Reach-134850100-Year14900.00439.30462.61456.16463.720.0033898.461760.95665.870.47 Reach-134850100-Year FW14900.00439.30462.77456.17463.840.0032648.331789.03690.010.47 Reach-134260100-Year14900.00438.80462.59454.76462.750.0005823.164718.76863.910.20 Reach-134260100-Year FW14900.00438.80462.76454.76462.910.0005523.094815.67597.610.19 Reach-133470100-Year14900.00439.00461.74451.83462.080.0012774.693375.351473.570.30 Reach-133470100-Year FW14900.00439.00461.91451.81462.250.0013004.713166.35403.020.30 Reach-133145100-Year14900.00438.40461.44454.17461.670.0010673.853924.151983.000.22 Reach-133145100-Year FW14900.00438.40461.62454.17461.840.0010213.793932.65427.770.22 Reach-132725100-Year14900.00438.20461.24455.11461.340.0005123.336945.332160.040.19 Reach-132725100-Year FW14900.00438.20461.38455.05461.510.0005883.596236.081619.880.20 Reach-132305100-Year14900.00437.70460.14456.13460.850.0027777.372372.56501.990.43 Reach-132305100-Year FW14900.00437.70460.16456.04460.950.0030277.702230.70473.500.45 Reach-132250100-Year14900.00437.00460.30448.10460.680.0007005.454371.961261.480.23 Reach-132250100-Year FW14900.00437.00460.35448.10460.760.0007445.633936.83998.980.24 Reach-132230100-Year21300.00435.00457.90454.76460.460.00104413.221735.40167.860.66 Reach-132230100-Year FW21300.00435.00458.09454.76460.560.00100812.991767.56169.770.65 Reach-132215Bridge Reach-132200100-Year21300.00435.00457.72454.77460.370.00108813.421706.52166.120.68 Reach-132200100-Year FW21300.00435.00457.93454.77460.480.00103613.181740.90168.190.66 Reach-132150100-Year21300.00437.00457.93450.83459.660.00185610.762294.33380.460.47 Reach-132150100-Year FW21300.00437.00458.13450.83459.790.00178110.592330.12329.270.47 Reach-131335100-Year21300.00438.55457.85456.71458.500.0029827.983754.061022.590.44 Reach-131335100-Year FW21300.00438.55458.09456.71458.650.0025667.444003.161059.110.41 Reach-130958100-Year21300.00438.55457.94451.70458.060.0003622.387869.111142.510.14 Reach-130958100-Year FW21300.00438.55458.15451.70458.260.0003362.288106.811146.630.13 Reach-130604100-Year21300.00438.55457.44451.70457.820.0016335.344513.70827.030.31 Reach-130604100-Year FW21300.00438.55457.69451.70458.040.0014745.124723.70834.370.29 Reach-130384100-Year21300.00438.14456.77450.86457.340.0021356.203509.66430.350.36 Reach-130384100-Year FW21300.00438.14457.07450.86457.600.0019795.983640.96442.020.34 HEC-RAS Plan: RevEx_FEMA FW River: RIVER-1 Reach: Reach-1 ( ReachRiver StaProfileQ TotalMin Ch ElW.S. ElevCrit W.S.E.G. ElevE.G. SlopeVel ChnlFlow AreaTop WidthFroude # Chl (cfs)(ft)(ft)(ft)(ft)(ft/ft)(ft/s)(sq ft)(ft) Reach-130027100-Year21300.00438.23456.40450.28456.690.0011334.484988.48682.580.25 Reach-130027100-Year FW21300.00438.23456.74450.28457.000.0010264.235222.78700.680.24 Reach-129831100-Year21300.00438.14456.36449.72456.500.0003683.106948.64858.420.17 Reach-129831100-Year FW21300.00438.14456.70449.72456.830.0003302.957244.20867.630.16 Reach-129651100-Year21300.00438.06456.27448.58456.420.0005223.466928.871022.100.19 Reach-129651100-Year FW21300.00438.06456.62448.58456.760.0004583.257298.171047.340.18 Reach-129124100-Year21300.00437.40455.74448.22456.060.0009985.025243.19985.500.26 Reach-129124100-Year FW21300.00437.40456.19448.22456.460.0008364.605689.24993.650.24 Reach-128890100-Year21300.00437.10455.68450.87455.820.0005043.247371.131078.600.18 Reach-128890100-Year FW21300.00437.10456.13450.87456.250.0004242.947862.441091.660.16 Reach-128720100-Year21300.00436.80455.65448.93455.740.0002282.388981.901097.100.13 Reach-128720100-Year FW21300.00436.80456.11448.93456.190.0001962.209483.931108.800.12 Reach-128492100-Year21300.00436.30455.61448.63455.680.0001651.9610204.521221.750.11 Reach-128492100-Year FW21300.00436.30456.07448.63456.130.0001431.7910772.271238.960.10 Reach-128168100-Year21300.00436.60455.57448.62455.630.0001471.8610907.681315.150.10 Reach-128168100-Year FW21300.00436.60456.03448.62456.090.0001271.6911527.031333.020.09 Reach-127992100-Year21300.00435.60455.52447.08455.590.0002232.3110122.531345.580.12 Reach-127992100-Year FW21300.00435.60455.99447.08456.060.0001882.1110765.911356.820.11 Reach-127748100-Year21300.00435.20455.46448.57455.530.0001952.1110323.531447.430.11 Reach-127748100-Year FW21300.00435.20455.95448.57456.000.0001641.9011029.871464.740.10 Reach-127449100-Year21300.00435.60455.39448.49455.470.0002451.979875.591555.660.12 Reach-127449100-Year FW21300.00435.60455.89448.49455.950.0002081.6910657.751603.160.10 Reach-127165100-Year21300.00436.10455.28451.05455.390.0003823.048577.841419.850.16 Reach-127165100-Year FW21300.00436.10455.80451.05455.890.0003022.719316.071428.820.14 Reach-126880100-Year21300.00436.20454.73446.05455.190.0012395.484372.321176.840.29 Reach-126880100-Year FW21300.00436.20455.38446.05455.730.0010594.945155.631313.480.26 Reach-126830100-Year21300.00436.30454.69447.03455.090.0007895.485478.821199.310.30 Reach-126830100-Year FW21300.00436.30455.08447.03455.640.0009506.063677.27438.780.33 Reach-125770100-Year20600.00434.60453.97443.97454.440.0005255.503742.09272.690.26 Reach-125770100-Year FW20600.00434.60454.51443.97454.950.0004705.303890.38276.630.25 Reach-125530100-Year20600.00434.40453.52445.27454.250.0009066.863000.98235.670.34 Reach-125530100-Year FW20600.00434.40454.11445.27454.780.0007986.563141.22240.130.32 HEC-RAS Plan: Prop_FEMA FW River: RIVER-1 Reach: Reach-1 ReachRiver StaProfileQ TotalMin Ch ElW.S. ElevCrit W.S.E.G. ElevE.G. SlopeVel ChnlFlow AreaTop WidthFroude # Chl (cfs)(ft)(ft)(ft)(ft)(ft/ft)(ft/s)(sq ft)(ft) Reach-156940100-Year9400.00449.00474.51463.46474.790.0006685.063394.471466.000.22 Reach-156940100-Year FW9400.00449.00475.42463.46475.730.0006325.052666.52632.950.21 Reach-155590100-Year9400.00452.40473.26464.59473.680.0010605.813105.971414.830.27 Reach-155590100-Year FW9400.00452.40474.11464.59474.620.0010986.062248.13596.020.27 Reach-153350100-Year9400.00448.00472.58459.18472.700.0002163.295342.232203.060.13 Reach-153350100-Year FW9400.00448.00473.33459.18473.480.0002603.573736.25894.940.14 Reach-151350100-Year9400.00446.50472.02457.46472.100.0004872.625017.501440.420.17 Reach-151350100-Year FW9400.00446.50472.56457.46472.710.0006813.243256.71600.000.21 Reach-148000100-Year9800.00445.60470.74460.64470.830.0002893.336286.561543.480.14 Reach-148000100-Year FW9800.00445.60471.25460.64471.330.0002613.246165.021300.000.14 Reach-140650100-Year10200.00440.00468.17455.66468.420.0005614.743622.71824.440.20 Reach-140650100-Year FW10200.00440.00468.77455.66469.050.0005504.803173.39499.000.20 Reach-139940100-Year15400.00442.00467.01458.99467.740.0013747.833105.79615.070.32 Reach-139940100-Year FW15400.00442.00467.56458.99468.370.0013838.012736.12400.000.32 Reach-139540100-Year15400.00442.00466.25458.83467.090.0017617.962776.18584.970.36 Reach-139540100-Year FW15400.00442.00466.70458.83467.680.0018418.312338.28385.320.37 Reach-139490100-Year15600.00442.00466.38457.02466.820.0011535.383112.31376.880.29 Reach-139490100-Year FW15600.00442.00466.94457.02467.320.0009905.073324.10388.910.27 Reach-139436100-Year15600.00443.54466.20457.66466.740.0008326.733474.41631.140.29 Reach-139436100-Year FW15600.00443.54466.73457.66467.240.0007536.533440.80430.000.27 Reach-139281100-Year15600.00439.81465.92455.40466.560.0010896.943055.62664.270.32 Reach-139281100-Year FW15600.00439.81465.93455.41466.930.0014778.082113.10301.650.37 Reach-138988100-Year15600.00440.24465.88455.20466.190.0004674.813959.17765.730.21 Reach-138988100-Year FW15600.00440.24466.03455.20466.380.0004904.963674.42575.400.22 Reach-138781100-Year15600.00437.90465.87455.46466.080.0003644.304647.17789.390.19 Reach-138781100-Year FW15600.00437.90465.97455.46466.270.0004644.873880.12602.730.21 Reach-138573100-Year15600.00439.99465.85455.29466.000.0002433.184931.04785.100.15 Reach-138573100-Year FW15600.00439.99465.97455.29466.160.0002923.504415.04646.620.16 Reach-138381100-Year15600.00440.95465.83453.62465.960.0001763.195473.80765.320.13 Reach-138381100-Year FW15600.00440.95465.94453.62466.100.0002113.504943.40634.920.15 Reach-138194100-Year15600.00437.63465.72455.52465.910.0002973.624519.97715.570.17 Reach-138194100-Year FW15600.00437.63465.80455.52466.040.0003894.153940.55570.850.19 Reach-137969100-Year15600.00437.61465.62454.70465.840.0003553.974198.77673.480.18 Reach-137969100-Year FW15600.00437.61465.71454.70465.960.0003964.213919.38574.150.19 Reach-137787100-Year15600.00438.68465.34455.39465.740.0006125.834238.89994.430.24 Reach-137787100-Year FW15600.00438.68465.45455.39465.860.0006015.804104.66900.000.24 Reach-137727100-Year15600.00438.44465.30455.73465.680.0009125.884254.141064.320.28 Reach-137727100-Year FW15600.00438.44465.41455.73465.800.0009105.904140.47972.000.28 Reach-137718Bridge Reach-137702100-Year15600.00438.36465.22455.65465.640.0008456.134275.581074.420.28 Reach-137702100-Year FW15600.00438.36465.34455.65465.760.0008246.094216.26990.000.27 Reach-137539100-Year15600.00437.53465.04454.10465.530.0007456.434371.731080.800.26 Reach-137539100-Year FW15600.00437.53465.18454.10465.650.0007166.334372.211005.000.26 Reach-137350100-Year15600.00440.19465.02456.38465.380.0007745.574629.221161.080.26 Reach-137350100-Year FW15600.00440.19465.17456.38465.500.0007235.424752.081119.000.26 Reach-137201100-Year15600.00439.47465.00458.82465.240.0007374.424841.351127.670.25 Reach-137201100-Year FW15600.00439.47465.15458.82465.380.0006854.314953.441098.900.24 Reach-136990100-Year15600.00438.45464.98453.89465.130.0002212.655887.271228.410.14 Reach-136990100-Year FW15600.00438.45465.13453.89465.270.0002112.625927.311174.000.14 Reach-136837100-Year15600.00437.35464.96452.83465.090.0002012.646148.081125.060.13 Reach-136837100-Year FW15600.00437.35465.11452.83465.240.0002012.666047.821037.000.14 HEC-RAS Plan: Prop_FEMA FW River: RIVER-1 Reach: Reach-1 (C ReachRiver StaProfileQ TotalMin Ch ElW.S. ElevCrit W.S.E.G. ElevE.G. SlopeVel ChnlFlow AreaTop WidthFroude # Chl (cfs)(ft)(ft)(ft)(ft)(ft/ft)(ft/s)(sq ft)(ft) Reach-136542100-Year15600.00437.17464.85453.05465.030.0002323.245073.60927.160.15 Reach-136542100-Year FW15600.00437.17464.98453.05465.180.0002353.274904.64826.000.15 Reach-136465100-Year15600.00436.06464.85450.28465.010.0001753.195255.65784.590.13 Reach-136465100-Year FW15600.00436.06464.99450.28465.150.0001753.215097.06694.420.13 Reach-136248100-Year14900.00438.23464.60456.14464.930.0006735.463871.35734.770.25 Reach-136248100-Year FW14900.00438.23464.66456.15465.060.0007715.853365.04568.640.27 Reach-136238Bridge Reach-136228100-Year14900.00438.34464.57456.10464.880.0006685.293965.74747.350.25 Reach-136228100-Year FW14900.00438.34464.64456.10465.010.0007615.663449.89579.830.26 Reach-136034100-Year14900.00439.29464.51451.87464.770.0003584.354675.32709.500.19 Reach-136034100-Year FW14900.00439.29464.62451.87464.880.0003594.384482.52575.000.19 Reach-135838100-Year14900.00435.75464.37450.51464.680.0004954.814269.41734.230.22 Reach-135838100-Year FW14900.00435.75464.45450.51464.790.0005214.953908.36560.000.23 Reach-135614100-Year14900.00437.29464.12450.90464.540.0006935.533890.46857.010.26 Reach-135614100-Year FW14900.00437.29464.20450.90464.650.0007135.633615.29676.000.26 Reach-135484100-Year14900.00435.85464.12454.72464.380.0006354.453749.96753.510.24 Reach-135484100-Year FW14900.00435.85464.22454.72464.470.0006104.383748.60724.000.23 Reach-135082100-Year14900.00435.46463.76451.35464.140.0006385.234258.301803.100.25 Reach-135082100-Year FW14900.00435.46463.86451.35464.250.0006325.224140.55730.920.25 Reach-134950100-Year14900.00439.30463.31455.97463.980.0014466.832467.46555.420.36 Reach-134950100-Year FW14900.00439.30463.46455.97464.090.0013396.632553.55556.000.35 Reach-134850100-Year14900.00439.30462.61456.16463.720.0033898.461760.95665.870.47 Reach-134850100-Year FW14900.00439.30462.77456.17463.840.0032648.331789.03690.010.47 Reach-134260100-Year14900.00438.80462.59454.76462.750.0005823.164718.76863.910.20 Reach-134260100-Year FW14900.00438.80462.76454.76462.910.0005523.094815.67597.610.19 Reach-133470100-Year14900.00439.00461.74451.83462.080.0012774.693375.351473.570.30 Reach-133470100-Year FW14900.00439.00461.91451.81462.250.0013004.713166.35403.020.30 Reach-133145100-Year14900.00438.40461.44454.17461.670.0010673.853924.151983.000.22 Reach-133145100-Year FW14900.00438.40461.62454.17461.840.0010213.793932.65427.770.22 Reach-132725100-Year14900.00438.20461.24455.11461.340.0005123.336945.332160.040.19 Reach-132725100-Year FW14900.00438.20461.38455.05461.510.0005883.596236.081619.880.20 Reach-132305100-Year14900.00437.70460.14456.13460.850.0027777.372372.56501.990.43 Reach-132305100-Year FW14900.00437.70460.16456.04460.950.0030277.702230.70473.500.45 Reach-132250100-Year14900.00437.00460.30448.10460.680.0007005.454371.961261.480.23 Reach-132250100-Year FW14900.00437.00460.35448.10460.760.0007445.633936.83998.980.24 Reach-132230100-Year21300.00435.00457.90454.76460.460.00104413.221735.40167.860.66 Reach-132230100-Year FW21300.00435.00458.09454.76460.560.00100812.991767.56169.770.65 Reach-132215Bridge Reach-132200100-Year21300.00435.00457.72454.77460.370.00108813.421706.52166.120.68 Reach-132200100-Year FW21300.00435.00457.93454.77460.480.00103613.181740.90168.190.66 Reach-132150100-Year21300.00437.00457.93450.83459.660.00185610.762294.33380.460.47 Reach-132150100-Year FW21300.00437.00458.13450.83459.790.00178110.592330.12329.270.47 Reach-131335100-Year21300.00438.55457.85456.71458.500.0029827.983754.061022.590.44 Reach-131335100-Year FW21300.00438.55458.09456.71458.650.0025667.444003.161059.110.41 Reach-130958100-Year21300.00438.55457.94451.70458.060.0003622.387869.111142.510.14 Reach-130958100-Year FW21300.00438.55458.15451.70458.260.0003362.288106.811146.630.13 Reach-130604100-Year21300.00438.55457.44451.70457.820.0016335.344513.70827.030.31 Reach-130604100-Year FW21300.00438.55457.69451.70458.040.0014745.124723.70834.370.29 Reach-130384100-Year21300.00438.14456.77450.86457.340.0021356.203509.66430.350.36 Reach-130384100-Year FW21300.00438.14457.07450.86457.600.0019795.983640.96442.020.34 HEC-RAS Plan: Prop_FEMA FW River: RIVER-1 Reach: Reach-1 (C ReachRiver StaProfileQ TotalMin Ch ElW.S. ElevCrit W.S.E.G. ElevE.G. SlopeVel ChnlFlow AreaTop WidthFroude # Chl (cfs)(ft)(ft)(ft)(ft)(ft/ft)(ft/s)(sq ft)(ft) Reach-130027100-Year21300.00438.23456.40450.28456.690.0011334.484988.48682.580.25 Reach-130027100-Year FW21300.00438.23456.74450.28457.000.0010264.235222.78700.680.24 Reach-129831100-Year21300.00438.14456.36449.72456.500.0003683.106948.64858.420.17 Reach-129831100-Year FW21300.00438.14456.70449.72456.830.0003302.957244.20867.630.16 Reach-129651100-Year21300.00438.06456.27448.58456.420.0005223.466928.871022.100.19 Reach-129651100-Year FW21300.00438.06456.62448.58456.760.0004583.257298.171047.340.18 Reach-129124100-Year21300.00437.40455.74448.22456.060.0009985.025243.19985.500.26 Reach-129124100-Year FW21300.00437.40456.19448.22456.460.0008364.605689.24993.650.24 Reach-128890100-Year21300.00437.10455.68450.87455.820.0005043.247371.131078.600.18 Reach-128890100-Year FW21300.00437.10456.13450.87456.250.0004242.947862.441091.660.16 Reach-128720100-Year21300.00436.80455.65448.93455.740.0002282.388981.901097.100.13 Reach-128720100-Year FW21300.00436.80456.11448.93456.190.0001962.209483.931108.800.12 Reach-128492100-Year21300.00436.30455.61448.63455.680.0001651.9610204.521221.750.11 Reach-128492100-Year FW21300.00436.30456.07448.63456.130.0001431.7910772.271238.960.10 Reach-128168100-Year21300.00436.60455.57448.62455.630.0001471.8610907.681315.150.10 Reach-128168100-Year FW21300.00436.60456.03448.62456.090.0001271.6911527.031333.020.09 Reach-127992100-Year21300.00435.60455.52447.08455.590.0002232.3110122.531345.580.12 Reach-127992100-Year FW21300.00435.60455.99447.08456.060.0001882.1110765.911356.820.11 Reach-127748100-Year21300.00435.20455.46448.57455.530.0001952.1110323.531447.430.11 Reach-127748100-Year FW21300.00435.20455.95448.57456.000.0001641.9011029.871464.740.10 Reach-127449100-Year21300.00435.60455.39448.49455.470.0002451.979875.591555.660.12 Reach-127449100-Year FW21300.00435.60455.89448.49455.950.0002081.6910657.751603.160.10 Reach-127165100-Year21300.00436.10455.28451.05455.390.0003823.048577.841419.850.16 Reach-127165100-Year FW21300.00436.10455.80451.05455.890.0003022.719316.071428.820.14 Reach-126880100-Year21300.00436.20454.73446.05455.190.0012395.484372.321176.840.29 Reach-126880100-Year FW21300.00436.20455.38446.05455.730.0010594.945155.631313.480.26 Reach-126830100-Year21300.00436.30454.69447.03455.090.0007895.485478.821199.310.30 Reach-126830100-Year FW21300.00436.30455.08447.03455.640.0009506.063677.27438.780.33 Reach-125770100-Year20600.00434.60453.97443.97454.440.0005255.503742.09272.690.26 Reach-125770100-Year FW20600.00434.60454.51443.97454.950.0004705.303890.38276.630.25 Reach-125530100-Year20600.00434.40453.52445.27454.250.0009066.863000.98235.670.34 Reach-125530100-Year FW20600.00434.40454.11445.27454.780.0007986.563141.22240.130.32