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
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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.
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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)