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NL Cypress Kimley>>>Horn TECHNICAL MEMORANDUM To: Hamid Fard, P.E. —City of Dallas From: Brad Moss, P.E. —Kimley-Horn and Associates, Inc. Cc: Jacob Reinig, P.E., ENV SP—Kimley-Horn and Associates, Inc. Brad Pickering, P.E., CFM—Kimley-Horn and Associates, Inc Date: February 4, 2015 Subject: Drainage Analysis—Channel E- Cypress Waters Development Billingsley Company proposes to construct the first phase of Olympus Boulevard improvements from Belt Line Road to approximately 3,600 LF southeast to the future Town Center and a 1,100 LF extension of Cypress Waters Boulevard from the Multi-Family Phase 1 site to north to tie in with Olympus Boulevard at the future Town Center. Olympus Boulevard is proposed to consist of a combined 4-lane divided and 4-lane undivided street section. The purpose of this drainage analysis is to describe the methodology and design of a proposed channel ("Channel E")and culvert("Culvert E") intended to convey flow generated by areas west of Belt Line Road and within the Cypress Waters development to North Lake. The following technical memorandum summarizes the hydrologic and hydraulic modeling used for this analysis. HYDROLOGIC MODELING Kimley-Horn prepared one hydrologic model for the watershed draining to Culvert El as shown on the attached Drainage Area Map. The model represents fully developed watershed conditions. HEC-HMS 3.5 was used to calculate the peak flow rates generated by the watershed for the 1-, 2-, 5-, and 100-year storm events. The NRCS Unit Hydrograph Method was used in accordance with City of Dallas criteria. Fully developed times of concentration were calculated in accordance with the methodology described in Technical Release 55 (NRCS, 1986) and the City of Dallas Drainage Design Manual. Curve Numbers for fully developed watershed conditions are based on anticipated fully developed land uses and soil type.Anticipated fully developed land uses are based on the Conditional Letter of Map Revision for North Lake prepared by Kimley-Horn and Associates, Inc., dated September 2012. Soil types were found to consist of predominantly Type D soils based on the NRCS Web Soil Survey (NRCS, 2014). Drainage area boundaries within the watershed were determined using aerial and on-ground topographic information, record plans provided by the City of Dallas and Coppell, and site observations. kimley-horn.com 12750 Merit Drive, Suite 1000, Dallas, TX 75251 972-770-1300 Kim ey>>>Horn Page 2 The watershed contributing flow to the subject reach is approximately 280 acres and is shown on the attached Drainage Area Map. Fully developed condition peak flow in the 1-, 2-, 5-, and 100-year storm events are shown in Table 1. Table 1: Existing Peak Flow Summary Location Qi (cfs) Q2 (cfs) Qs (cfs) Qum (cfs) El 737 937 1213 2176 E2 377 484 633 1149 E3 114 146 189 340 HYDRAULIC MODELING Two channels are proposed to convey flow from Belt Line Road to North Lake. A new culvert is also proposed at the Olympus Boulevard crossing of the channel. The U.S Army Corp of Engineers HEC- RAS version 4.1.0 hydraulic modeling software was used for hydraulic modeling of the project under fully developed conditions. Design flows summarized in Table 1 were used in the development of the HEC-RAS model. The proposed channel consists of trapezoidal sections with a 40' bottom width and 4:1 side slopes. Four vertical drops are proposed to flatten the channel slope and maintain non-erosive flow velocity. Erosion protection is also proposed in areas of the channel where flow velocity exceeds 8 feet per second. The work map used to generate cross-sections for the HEC-RAS model is included in Appendix C. Refer to Appendix D for the HEC-RAS profiles, cross-section plots, and the output tables from the various models. Culvert E, as shown on the Drainage Area Map and Hydraulic Workmap, is located approximately 850 feet east of Belt Line Road. The crossing is sized to convey the fully developed peak flow generated by the watershed in general accordance with City of Dallas Drainage Design Criteria. The crossing will consist of 6-10' x 6' pre-cast reinforced concrete box culverts. Attachments A-Channel E - Drainage Area Map B - Proposed Condition Hydrologic Model Output C- Hydraulic Workmap D - HEC-RAS Output E - Digital Files v„,t--,41111-;.---7!_,,. ti 1 ',' :,--i [ , , .. -,..,„ ...:,,„:„„-_,...,_. —7-,-,----;;LLtt'—"...C2LTL____.:.L.1,1r--;':'-.5.-' '' ' __„,,,_„„,i__.._,_..._,,:.,_„._.,,.::,,:,:;,s,'":7.,,,, '''''''' ..":",''''',... ', r I ,,. . __ I ' 1r ' � oi \ Y 4 r \ � N y t - ' r � Pa /f. frr... ....0,4101 .:7,_.,t,„11 I I � I � � il 1. 11 _ Il llA. w. 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'\3c.iL , . t 9 tel^ h �hh `• ,�.''���� __,.„...-.. .....,./I �/ P ��"/�g\\ � fig � �` :. .-..Niv,4,.. ..4.,ozy., :-- , .. . ,.//js146,‘,7 .- '-'it..,,,. •,-i...,.. .•,... -.:. :;/• , -..„, -. ‘,, . d i../ ,, .. AP .„.• ,, .; 41,s,74,-,144:,,ifr.... ,r - ' - -, - �" p •. „� Xy s`t }f ve � r , 4,'.Jt'l � o ' " i a f N` '-�H4 , /h .4' Kimley»>Horn HEC-HMS OUTPUT Existing Condition Hydrologic Parameter Summary Name . Area Area Landuse CN T` (acres) (mit) (min) DA El 343 0.54 47% Industrial 94.07 14.86 53% Commercial and Business DA E2 189 0.29 80% Industrial 93.41 15.52 20% Commercial and Business 97% Industrial DA E3 48 0.08 3% Commercial and Business 93.05 14.66 Notes: 1.Time of Concentration based on Technical Release 55(NRCS, 1986) 2. CN based on Type D soils. ,ØH/H/////J//! \ r7 I \c, , 2/. /1 01,5 i --Ali /I ,/ ,ii\Aii-r_0; i' \ ' 41fr -- ----- \v / --- 4' ,, \ .,....., , t . \ s \ \, ., '\ ,4 Ai# , 4 \ , • ' i •• i ,,, \ , 4,, , \ ,„,,,, ,,,,,, , ' i \ w i/ i\‘‘. .. */ Air \\ ,,,,i s,,, \ ./I � `� ,,,40,, — \ ., :, , ow 1 / / \,4 ,�°\*, 4"\‘‘ s 7 Xv, .______.....,_,,-, ____,:, S.,,.04 i, \ , ---___ , -� i ;, t‘ %,/ - . , # .{-,....,.. /Jr ,/// ..i \ \ i \ , .t/, 7-/ , . ‘,/\ (53( , , tif coc % ,_ , , • ' . ‘,00 . i /, / / KC >, 7., .V ...- .-,< .-- x o , ....,. , , o \\ ., , ,,. \ , , .... .... , „ ..,„ ,, a e, ea e e a aa , aa \IPX00\ V 4\ 6 \<5(0 \ . '. \ 'NrX.,.. , Kimley>»Horn HEC-RAS OUTPUT HEC-RAS Output System E Reach River Sta QTotal Min Ch El W.S. Elev Crit W.S. E.G. Elev E.G.Slope Vel Chnl Flow Area Top Width Froude#Chl (cfs) (ft) (ft) (ft) (ft) (ft/ft) (ft/s) (sq ft) (ft) 2789.28 1148.5 501.54 504.38 503.58 504.67 0.002816 4.34 264.46 124.07 0.52 2689.28 1148.5 501.24 504.11 - 504.39 0.002683 4.28 268.55 124.32 0.51 2589.28 1148.5 500.94 503.86 - 504.13 0.002494 4.18 274.9 124.77 0.5 2579.28 1148.5 500.91 503.84 - 504.11 0.002477 4.17 275.49 124.79 0.49 2574.28 1148.5 500.89 503.82 - 504.09 0.002466 4.16 275.88 124.83 0.49 2569.28 1148.5 497.96 503.98 - 504.04 0.000207 1.96 585.21 126.62 0.16 2559.28 1148.5 497.93 503.98 - 504.03 0.000201 1.94 592.67 127.88 0.16 2369.28 3664.5 497.07 502.88 - 503.55 0.002399 6.57 558.07 124.03 0.55 2359.28 3664.5 497.33 502.56 501.42 503.42 0.003526 7.43 493.25 121.76 0.65 2354.28 3664.5 497.31 501.41 501.41 503.02 0.009079 10.19 359.76 112.65 1 2349.28 3664.5 494.37 501.56 499.06 502.14 0.001703 6.11 599.62 114.33 0.47 2339.28 3664.5 494.34 501.55 - 502.12 0.001667 6.05 605.41 115.24 0.47 El 2219.28 3664.5 493.98 499.94 - 500.88 0.003421 7.77 471.57 106.01 0.65 2209.28 3664.5 493.95 499.9 498.63 500.84 0.003462 7.8 469.62 105.86 0.65 2204.28 3664.5 493.93 498.61 498.61 500.4 0.008727 10.73 341.51 95.7 1 2199.28 3664.5 491 498.49 496.65 499.38 0.002743 7.57 484.21 95.37 0.59 2189.28 3664.5 490.97 498.48499.35 0.002664 7.48 489.72 96.02 0.58 2032.84 3664.5 490.39 498.67 494.3 499.01 0.000658 4.64 788.98 140.1 0.31 1922.62 Culvert 1813.51 3664.5 489.75 493.9 493.9 495.98 0.009349 11.58 316.39 76.72 1.01 1786.08 3664.5 489.55 493.16 493.64 495.53 0.013513 12.36 296.59 114.56 1.23 1561.34 3664.5 488.06 492.59 492.31 493.99 0.006951 9.5 385.88 109.71 0.89 1311.34 3664.5 486.4 491.55 - 492.56 0.004243 8.04 455.99 114.91 0.71 1198.17 3664.5 485.65 489.88 489.88 491.55 0.009037 10.36 353.61 107.44 1.01 1100 3664.5 485 488.22 488.65 490.24 0.015094 11.42 320.84 124.31 1.25 425 2176.2 493.23 499.02 497.42 499.66 0.002604 6.4 340.2 83.17 0.56 325 2176.2 492.58 498.91 - 499.4 0.001844 5.66 384.34 87 0.47 E2 225 2176.2 491.93 498.83 - 499.22 0.001318 5.04 431.89 90.4 0.41 125 2176.2 491.28 498.93 - 499.09 0.000451 3.28 662.71 118.23 0.24 227.77 339.8 502.96 504.55 504.18 504.74 0.004142 3.47 97.79 85.72 0.57 217.77 339.8 502.93 504.49 504.15 504.69 0.004588 3.59 94.7 85.43 0.6 E3 212.77 339.8 502.91 504.13 504.13 504.54 0.014505 5.14 66.17 82.71 1.01 207.77 339.8 497.99 503.83 499.46 503.84 0.000064 1.01 335.49 80.96 0.09 197.77 339.8 497.96 503.83 - 503.84 0.000063 1 340.45 82.32 0.09 Min El Reach River Sta E.G. US. W.S.US. E.G. IC E.G.OC Weir Q Culy Q Weir Delta WS Culv Vel US Culv Vel DS Group Flow (ft) (ft) (ft) (ft) (ft) (cfs) (cfs) (ft) (ft/s) (ft/s) El 1922.62 499.02 498.67 499.02 498.8 507.01 3664.5 4.77 11.72 12.53 Culvert Kimley>>>Horn Channel El Olympus Channel El Plan: 100 YR FD 1/22/2015 Olympus Channel El Plan: 100 YR FD 1/22/2015 Sta 11+00.00 Sta 11+98.17 49Legend49 .93, ,H, Legend 494 EGPF 1 49 EGPF 1 Crit PF 1 VS PF 1 494 + • 49 NSPF1 Crit PF1 —a— ■ Ground c 49 Ground 0 49 ■ o ■ Bair Sta Bait Sta a m 49 ww 48 48 486 48 484 484 0 50 100 150 200 250 300 0 50 100 150 200 250 Stas m(ft) Stat m(ft) Olympus Channel El Plan: 100 YR FD 1/22/2015 Olympus Channel El Plan: 100 YR FD 1/22/2015 Sta 13+11.34 Sta 15+61.34 .03 + 03H Legend Legend EGPF 1 495 .°3. . , . .+:—H. , EGPF 1 494 VS PF 1 qgq 'SPF 1 • 49 Gr:nd 49 Crit.F 1 E Bait Sta c Ground o o ■ Balk Sta m m u w 49 491 49 48 48 486 488 0 50 100 150 200 250 0 53 100 150 200 250 Staf m(ft) Stat m(ft) Olympus Channel El Plan: 100 YR FD 1/22/2015 Olympus Channel El Plan: 100 YR FD 1/22/2015 Sta 17+86.08 Sta 18+1351 .03 50' 0 0Legend Legend 504 EGPF 1 504 EGPF 1 50 Crit PF 1 50 WS PF 1 531 NS PF 150 Crit PF 1 ■ � —.— c 49: Ground c qg Ground o A o ■ Ineff > 49Bak Sta ut Balk Ste w 494 + 494 4949 49■ Si 49 48: 488 0 5) 100 150 200 250 0 50 100 150 200 250 Stat m(ft) Stat on(ft) Kimley>>>Horn Channel El Olympus Channel El Plan: 100 YR FD 1/22/2015 Olympus Channel El Plan: 100 YR FD 1/22/2015 Sta 20+32.84 Sta 21+8928 50: Legend 515 Legend 53. EGPF 1 EGPF 1 534 1ASPF1 51 V6PF1 50 Crit PF 1 Ground _.__ c 505 • 50 5 Ground c Balk Sta E A o m' 49: 1. Ir• r w Balk Sta W 50 49. 494 � 495 49 49' 490 O 50 100 150 200 250 0 50 100 150 200 250 Stal cn(ft) Staf m(ft) Olympus Channel El Plan: 100 YR FD 1/22/2015 Olympus Channel El Plan: 100 YR FD 1/22/2015 Sta 21+9928 Sta 22+0428 515 Legend 515 Legend EGPF1 EGPF1 51 V FF 1 51� 1A6 PF 1 Crit PF 1 Crit PF 1 c 505 Ground c 505 Ground o • o • tis' Ba k Sta Baik Sta LL 50 1 W MI 495 495 490 49, O 5) 100 150 200 250 0 50 100 150 200 250 Stat on(ft) Stat m(ft) Olympus Channel El Plan: 100 YR FD 1/22/2015 Olympus Channel El Plan: 100 YR FD 1/22/2015 Sta 22+0928 Sta 22+1928 515 Legend 515 Legend EGPF1 EGPF1 51 V:6PF1 51 V�.6PF1 Crit PF 1 Ground • o• 535Ground o 535BalkSta • — t".; Balk Sta i wS2 50 w 50 12 495 495 490 490 O 50 100 150 200 250 0 50 100 150 200 250 Stat m(ft) Stat m(ft) Kimley>>>Horn Channel El Olympus Channel El Plan: 100 YR FD 1/22/2015 Olympus Channel El Plan: 100 YR FD 1/22/2015 Sta 23+3928 Sta 23+4928 515480 , , , , I Legend 515 I Legend EGPF1 EGPF1 51 WSFF1 51 VS WS Ground Crit PF 1 ■ c 05 Bails Sta c 505 Ground tci O 0 r, mw— Bak Sta m m w w 53 495 495 490 O 50 100 150 200 250 0 50 100 150 200 250 Stas m(ft) Stat m(ft) Olympus Channel El Plan: 100 YR FD 1/22/2015 Olympus Channel El Plan: 100 YR FD 1/22/2015 Sta 23+5428 Sta 23+5928 514 Legend514 I Legend 51 EGPF 1 51 EGPF1 51r \ASPF1 51 VVSPF1 50: Crit PF1 50 Crit PF1 • c ■ E 93. Ground `0 Ground o • .771Ba* o 504 Sta • N4 Baic Sta w w 93 53 50' 53 49: 49 49. 496 � � i O 50 100 150 200 250 0 50 100 150 200 250 Stat m(ft) Stat m(ft) Olympus Channel El Plan: 100 YR FD 1/22/2015 Olympus Channel El Plan: 100 YR FD 1/22/2015 Sta 23+6928 Sta 25+5928 Legend 51 Legend EGPF1 514 EGPF1 51 V\6 PF 1 51 V.6 PF 1 51 50 Ground Ground • - 50 • 0 50 Bak Sta o BalkSta o U'fi W m 504 5 LTJ w 504 50 53 50 50 49 49 49551146 496 O 50 100 150 200 250 0 50 100 150 200 250 Stat m(ft) Stat m(ft) Kimley>>>Horn Channel El Olympus Channel El Plan: 100 YR FD 1/22/2015 Olympus Channel El Plan: 100 YR FD 1/22/2015 Sta 251-6928 Sta 251-7428 51 Legend 51. Legend 514 EGPF1 514 EGPF1 51 V6PF1 51 VVPF1 51 G wr rd Ground E 50 • 511 • c Bal(Sta c Balk Sta 0 '1 0 50 50: Lu 504 w53. 50 504 50 53 49 49 50r 0 50 100 150 200 250 0 50 100 150 200 250 Shat m(ft) Staf m(ft) Olympus Channel El Plan: 100 YR FD 1/22/2015 Olympus Channel El Plan: 100 YR FD 1/22/2015 Sta 251-7928 Sta 251-8928 51. Legend 51. Legend 514 EG PF 1 514 EG PF 1 51 V\SPF1 51 1A6PF1 51r Grind c 51r Gr•nd 0 c Balk Sta c Bads Sta > 0 50: 71 50: > m w 50. w 50. 504 934 50 93 50I 504 0 50 100 150 200 250 0 50 100 150 200 250 Stat!m(ft) Stat m(ft) Olympus Channel El Plan: 100 YR FD 1/22/2015 Olympus Channel El Plan: 100 YR FD 1/22/2015 Sta 26+8928 Sta 27+8928 .03 .03 .1 51• Legend 51' Legend 514 EGPF1 51. EGPF1 51 WS PF 1 514 V.6 PF 1 Grcund 51 Crit PF 1 c 51. • ■ Bads Sta o 51 8 Ground 50: i • 50: Back Sta >m a>> EU. 50. LU 50. 504 504 50 50 501 931- 0 50 100 150 200 250 0 50 100 150 200 250 Stall m(ft) Staicn(ft) , , Kimley>>>Horn Channel E2 100 YR FD 1/22/2015 100 YR FD 1/22/2015 Sta 1+2500 Sta 2+25.00 .03 I E 515 03 1 3I Legend 515 Legend EGPF1 EGPF1 51 WSPF1 51� WSPF1 t ■ Ground Ground c 05 Balk Sta NS c Bair Sta a o j w 3D w Wr 495 495 49 49# 0 50 100 150 200 250 0 50 100 150 200 250 Stal m(ft) Stai m(ft) 100 YR FD 1/22/2015 100 YR FD 1/22/2015 Sta 3+25.00 Sta 4+25.00 515Legend 515 Legend EGPF1 EGPF1 51r 51# VABFF1 VGPF1 • + Ground Crit PF 1 c 505 Ba*Sta 9 c 505 5 Ground co • Bait Sta Lu 50' w 50 495 495 49# 49# 0 50 100 150 200 250 0 50 100 150 200 250 Stat m(ft) Stat m(ft) Kimle >>>Horn Y Channel E3 100 YR FD 1/22/2015 100 YR FD 1/22/2015 Sta 1+97.77 Sta 2+07.77 51. Legend 51. Legend 514 514 EGPF1 EGPF1 51 VAS PF 1 51 WS PF 1 51 r Ground 51 i Crit PF 1 c 50• Balk Sta c 9D: Ground o g ■ m 50. �. Bak Sta w 504 w 934 50 50 501 50 49: 49: 49. 49. O 50 100 150 200 250 0 50 100 150 200 250 Stator(ft) Stefan(ft) 100 YR FD 1/22/2015 100 YR FD 1/22/2015 Sta 2+12.77 Sta 2+17.77 51. Legend 51. Legend 514 EG PF 1 514 EG PF 1 VS PF 1 1AS F1r 1 51 + 51 ----+----- Crit PF 1 Crit PF 1 c• 51 8 Ground c 51 I Ground o • o ■li Baik Sta Balc Sta N 50: d 5): w w 50• 50• 504 504 50 50 O 50 100 150 200 250 0 50 100 150 200 250 Stat ai(ft) Stat m(ft) 100 YR FD 1/22/2015 Sta 2+27.77 .03 H 51. Legend 514 EG PF 1 %NSPF1 51 * Crit PF 1 a ■ c 51' Ground 2 ■ m Bak Sta 'm 50: E 506 504 50 O 50 100 150 200 250 Staf on(ft)