Item 6B - Flood StudyFLOOD STUDY FOR
HTeaO at 190 Davis Blvd.
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In Southlake, Texas
October 28, 2021
Prepared by:
KCE Engineering, LLC
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Dr. Cuneyt Erbatur, PE, CFM
cunevt@kce-eng.com
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Introduction
Flood Study
HTeaO — Southlake, TX
October 28, 2021
This project is approximately 1.3788-acres located at 190 Davis Blvd in Southlake, Texas, as
shown in Appendix A — Figure 1. The Project site is currently undeveloped with a Sonic site to
the north, single-family residential properties to the east across Davis Blvd., and undeveloped
land to the south. Tributary BB-9 flows from north to south along the western side of the
property. Per FIRM 48439C0090L, revised March 21, 2019, there is FEMA floodplain (Zone AE)
within the Project site.
The Project is planned to be developed as an HTeaO commercial property with the construction
plans by Bowman Consulting. The topographic survey was performed by Spooner & Associates
and dated July 21, 2021.
The purpose of the flood study is to use the topographic survey data provided by Spooner &
Associates to determine the corrected effective 100-year floodplain within the limits of the
Project site. It is also to determine if the proposed Project will cause any adverse hydrologic
impacts to the adjacent properties. It is the intent of the Project for all work to remain outside
of the limits of the corrected effective 100-year floodplain of Tributary BB-9.
Overall Hydrologic Analysis
KCE requested the effective models for Tributary BB-9 from FEMA and received a PDF of the HEC-
2 output for Tributary BB-9 from lettered cross -sections A-G. In addition, KCE also received the
effective models and shapefiles from the upstream LOMR 19-06-1227P by Boyd Hydrology, PLLC
which became effective 4/27/2020. Since FEMA did not provide KCE with any effective
hydrologic models for the watershed of Tributary BB-9, KCE instead created a HEC-HMS model
to determine if the proposed Project would have an adverse hydrologic impact to other
properties.
KCE used the onsite topographic survey data provided by Spooner & Associates as well as the
2019 USGS lidar contour data to delineate the watershed to the downstream side of the Project
site. Based on the delineations by KCE, the watershed to the downstream side of the Project is
approximately 808-acres, so KCE selected the SCS Unit Hydrograph method as the most
appropriate method to determine the peak discharges at the junctions. Refer to Appendix A —
Figure 2 for the drainage area map.
The SCS curve number (CN) represents the runoff potential of a given area with the higher the
CN, the greater the runoff potential. The curve numbers are determined based on hydrologic
soil type and land use. For this project, KCE determined the CN based on the hydrologic soils type
from the USDA Web Soil Survey and the existing land use from the NCTCOG land use data, edited
to reflect more recent developments. Refer to Appendix A — Figure 2 for the existing land uses,
and the soils map is shown in Appendix A— Figure 3.
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Flood Study
HTeaO — Southlake, TX
October 28, 2021
The time of concentration is defined as the time required for water to flow from the most
hydraulically remote point of the basin to the design point of interest. The path of travel is
divided into sheet flow, shallow concentrated flow, and open channel flow (or closed storm
system flow). The times of concentration for the subbasins were calculated based on the SCS
publication Technical Release 55 (TR-55) standard engineering practices. The flowpaths used are
shown in Appendix A — Figure 2. The detailed time of concentration calculations are shown in
Appendix C.
Based on TR-55, the watershed lag time was calculated at 60% of the total time of concentration
for each drainage basin. The watershed lag time is the time from the center of mass of excess
rainfall to the peak rate of storm water runoff. Tables 1 and 2 shows the existing and proposed
hydrologic parameters, respectively.
Table 1— Existing Hydrologic Parameters
Existing
Sub
Basin
DA
(acres)
DA
(Sq.Mi.)
Lag Time
(min)
CN
A
0.915
0.001430
7.6
68
OS-1
807.073
1.261052
39.9
82
Table 2 — Proposed Hydrologic Parameters
Proposed
Sub
Basin
DA
(acres)
DA
(Sq.Mi.)
Lag Time
(min)
CN
A
0.915
0.001430
1.8
93
OS-1
807.073
1.261052
39.9
82
KCE used these parameters and the Atlas 14 rainfall data to create a hydrologic model for the
Tributary BB-9 watershed to the downstream side of the Project site in the United States Army
Corps of Engineers HEC-HMS (version 4.8) program to determine the peak discharges forthe 100-
and 2-year storm events. Table 3 below shows the results summary.
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Table 3 — Results Summary
Flood Study
HTeaO — Southlake, TX
October 28, 2021
Hydrologic
100-yr
Peak Discharge (cfs)
2-yr
Peak Discharge (cfs)
Junction
Existing
Proposed
Prop - Exist
Existing
Proposed
Prop - Exist
OS-1
2,547
2,547
0
873
873
0
A
5
11
5
1
5
4
Junction-1
2,548
2,548
0
873
873
0
Based on the results of the HEC-HMS model, although there is a slight increase in peak runoff for
subbasin A due to the proposed development, the net impact at the downstream junction,
Junction-1, is no change to the peak discharge for either flow event. Therefore, the proposed
Project should be able to develop as planned with no detention.
Per the effective FIS data, the effective 100-year peak discharge at the corporate limits of the City
of Southlake approximately 3,000-ft downstream of the Project site is 2,650 cfs, so the watershed
peak discharge of 2,548 cfs at Junction-1 is reasonable.
Overall Hydraulic Analysis
KCE requested the effective models for Tributary BB-9 from FEMA and received a PDF of the HEC-
K output for Tributary BB-9 from lettered cross -sections A-G. In addition, KCE also received the
effective models and shapefiles from the upstream LOMR 19-06-1227P by Boyd Hydrology, PLLC
which became effective 4/27/2020. After opening the provided models and shapefiles from
FEMA, KCE determined that the current effective FEMA floodplain through the Project site
appears to have been moved or shifted from the actual location of the creek.
Since the provided models are not in the correct location, KCE created a hydraulic model of
Tributary BB-9 through the Project site. KCE used a combination of the onsite topographic survey
data provided by Spooner & Associates within the Project boundaries and the USGS 2019 contour
data for the offsite portions to create an existing terrain. KCE determined the Manning's n-values
based on aerial images of the site and from the effective model. The downstream limits were set
as a known water surface elevations from the FIS effective lettered cross-section E.
The United States Army Corps of Engineers HEC-RAS (version 6.0) program was used to calculate
the WSEL and velocity within the limits of the study. Table 4 below displays the HEC-RAS results
from the FIS effective 100-year peak discharges through the Project site. The corrected existing
floodplain is shown in Appendix A — Figure 4. Refer to Appendix D for the HEC-RAS profile and
cross -sections for the FEMA storm events for Tributary BB-9.
Page 14
Flood Study
HTeaO — Southlake, TX
October 28, 2021
Table 4 —100-Year HEC-RAS Results
Tributary
BB-9 100-yr Results
River Station
Q Total
(cfs)
Existing
WSEL
(ft)
Velocity
(fps)
Valley Storage
(acre-ft)
7499
2650
639.91
3.82
16.25
7305
2650
639.24
5.49
12.7
7222
2650
638.94
6.17
11.28
7091
2650
638.28
6.82
9.16
6928
2650
637.53
6.35
6.61
6774
2650
636.78
6.26
4.24
6674
2650
636.35
5.37
2.49
6490
2650
635.75
5.31
0
Once KCE provided Bowman Consulting with the corrected existing 100-year floodplain through
the Project site, the proposed site and grading plans were adjusted to remain outside of the 100-
year floodplain. The FFE of the building was set at 651.00 which is more than 11-ft above the
adjacent 100-year WSEL of 639.24.
Page 15
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Conclusions
Flood Study
HTeaO — Southlake, TX
October 28, 2021
This flood study was performed to determine if the proposed Project can be constructed as
planned without causing an adverse hydrologic or hydraulic impact to other properties per the
City of Southlake definition. Based on the results of the hydrologic analysis, there are minor
increases in the onsite peak discharge as a result of the Project but the net impact to the
watershed is no change to the peak discharge of Tributary BB-9 due to the timing of the
contributing hydrographs.
KCE delineated the corrected effective 100-year floodplain through the Project site using the
effective FIS peak discharges. All proposed onsite improvements were designed by Bowman
Consulting to remain outside of the corrected existing 100-year floodplain. The proposed HE of
the onsite building is more than 11-ft above the adjacent 100-year WSEL. Therefore, the Project
should be able to be constructed as planned with no onsite detention and no floodplain
reclamation.
If you have any questions or comments, please feel free to call.
Sincerely,
Dr. Cuneyt Erbatur, PE, CFM, LEED AP
Principal
15 KCE Engineering, LLC
a Texas limited liability corporation
TBPE Reg. No. F-16940
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Appendices
Appendix A — Exhibits
Flood Study
HTeaO — Southlake, TX
October 28, 2021
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Appendix B — FIS Data
Flood Study
HTeaO — Southlake, TX
October 28, 2021
TABLE 4 - SUMMARY OF DISCHARGES (continued)
PEAK DISCHARGES (cfs)
DRAINAGE 10°/° 2°/ 1°/ 0
FLOODING SOURCE o o
Redelineation Detailed Studv Streams
TRIBUTARY BB-7
At Eagle Bend
TRIBUTARY BB-8
Upstream of confluence with
Big Bear Creek
Upstream of left bank tributary 500 feet
upstream of Continental Boulevard
0.32 ** ** 987 **
2.25 2,550 3,500 3,950 5,000
1.22 1,450 2,000 2,250 2,900
TRIBUTARY BB-9
Upstream of confluence with Big Bear 1.97 1,950 2,750 3,100 3,950
Creek
At Southlake corporate limits 1.33 1,700 2,350 2,650 3,400
TRIBUTARY BB-10
At confluence with Big Bear Creek **
Downstream of confluence of left bank
tributary (approximately 1,900 feet **
downstream of the Johnson
Road crossing
Upstream of confluence of left bank
tributary approximately 1,900 feet **
downstream of the Johnson Road
crossing
TRIBUTARY BB- 11
3,050
4,250
4,800
6,100
2,500
3,450
3,900
4,950
1,450 2,000 2,250 2,850
At confluence with Big Bear Creek 1.18 2,700
TRIBUTARY BB-12
At confluence with Big Bear Creek **
At FM 1709
TRIBUTARY BB-13
Approximately 1,500 feet upstream of 0.45
its confluence with Big Bear Creek
UNNAMED TRIBUTARY TO BIG BEAR CREEK
Approximately 800 feet upstream of 0.35
Keller -Hicks Road
STREAM BFC-1
2,400
2,000
755
3,375
4,302
5,225
3,300
3,700
4,600
2,700
3,000
3,750
1,105
1,276
1,651
** **
At confluence with Big Fossil Creek 2.34 4,070
At North Beach Street 2.26 4,070
At Western Center Boulevard 2.00 3,830
521 **
5,420 6,010 7,320
5,410 6,000 7,310
5,080 5,630 6,860
=11
650
•"1
630
620
610
o11
590
0 1000 2000 3000 4000 5000 6000 7000
STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH BIG BEAR CREEK
LEGEND
0.2% ANNUAL CHANCE FLOOD
------- 1 % ANNUAL CHANCE FLOOD
- - 2% ANNUAL CHANCE FLOOD
- - - - - - - - - 10%ANNUAL CHANCE FLOOD
STREAM BED
CROSS SECTION LOCATION
8000 9000 10000
660
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Appendix C — Hydrologic Data
Flood Study
HTeaO — Southlake, TX
October 28, 2021
9/28/21, 3:06 PM Precipitation Frequency Data Server
NOAA Atlas 14, Volume 11, Version 2
Location name: Roanoke, Texas, USA*��`"
Latitude: 32.9522°, Longitude:-97.1965°
Elevation: 705.85 ft**
* source: ESRI Maps "R t4 ^►
** source: USGS
POINT PRECIPITATION FREQUENCY ESTIMATES
Sanja Perica, Sandra Pavlovic, Michael St. Laurent, Carl Trypaluk, Dale Unruh, Orlan Wilhite
NOAA, National Weather Service, Silver Spring, Maryland
PF tabular I PF graphical I Maps & aerials
PF tabular
PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches)1
Average recurrence interval (years)
Duration ����������
1 2 5 10 25 50 100 200 500 1000
5-min 0.409 0.477 0.589 0.681 0.807 0.902 0.999 1.10 1.23 1.34
(0.310-0.540) (0.365-0.626) (0.449-0.774) (0.511-0.905) (0.586-1.10) (0.638-1.26) (0.689-1.42) (0.739-1.60) (0.802-1.85) F847-2.04)
10-min 0.655 0.765 0.944 1.09 1.30 1.45 1.61 F1�76 (0.496-0.865) (0.585-1.00) (0.719-1.24) (0.820-1.45) (0.942-1.77) (1.03-2.02) (1.11-2.29) 2.56) F1.272.94) F17.33.23)
15-min 0.814 0.950 1.18 1.36 1.61 1.80 1.98 2.17 2.44 2.65
(0.616-1.08) (0.729-1.25) (0.898-1.55) (1.02-1.81) (1.17-2.19) (1.27-2.50) (1.37-2.82) (1.46-3.17) (1.59-3.65) (1.67-4.04)
30-min 1.13 1.32 1.63 1.88 2.22 2.47 2.73 3.00 3.37 3.66
(0.857-1.49) (1.01-1.73) (1.24-2.14) (1.41-2.50) (1.61-3.01) (1.75-3.43) F
88-3.88) (2.02-4.36) (2.19-5.05) (2.32-5.60)
60-min 1.47 1.72 2.12 2.90 3.24 3.59 3.97 4.48 4.89
(1.11-1.94) (1.31-2.25) (1.61-2.78) E(i.T83.2:6) (2.10-3.94) (2.29-4.51) (2.48-5.11) F(2.67-5.77) F91-6.71) (3.09-7.47)
2-hr 1.80 2.12 2.64 3.08 3.69 4.16 4.64 517 5.91 6.49
(1.38-2.35) (1.63-2.74) (2.03-3.43) (2.33-4.05) (2.70-4.96) (2.96-5.72) (3.23-6.53) FC3.56-7.43) (3.86-8.72) (4.14-9.78)
3-hr 1 1.99 2.37 2.97 3.48 4.19 4.75 5.34 5.97 6.87 7.58
( .53-2.59) (1.83-3.04) (2.29-3.83) (2.65-4.54) (3.09-5.60) (3.41-6.49) (3.73-7.45) (4.06-8.51) (4.51-10.1) (4.85-11.3)
6-hr 2.36 2.82 3.56 4.20 5.10 5.81 =6�5 7.39 8.54 9.47(1.83-3.02) (2.20-3.57) (2.78-4.54) (3.22-5.42) (3.79-6.74) (4.20-7.84) (5.64-12.3) (6.09-13.9)
F12-hr 2.77 3.33 4.22 4.98 6.06 6.92 =(5.5.
8.80 10.2 ) 11.3
(2.17-3.52) (2.62-4.17) (3.32-5.33) (3.87-6.37) (4.55-7.92) (5.04-9.22) (6.07-12.2) (6.77-14.5 (7.31-16.4)
24-hr 3.24 3.90 4.93 =(4.5�7.36)
7.09 8.09 9.14 0.3 11.9 13.2
(2.56-4.06) (3.09-4.82) (3.92-6.16) (5.36-9.14) (5.94-10.6) (6.53-12.3) FL7.115-14.1) (7.97-16.7) (8.59-18.8)
2-day 3.76 4.50 5.67 6.68 8.12 9.27 10.5 11.8 13.7 =(9.951
(3.00-4.66) (3.60-5.50) (4.54-6.99) (5.28-8.34) (6.20-10.3) (6.87-12.0) (7.56-13.9) (8.27-15.9) (9.22-18.9)
3-day 4.09 4.89 6.15 7.25 8.81 10.1 =(8.245.0)
12.8 14.9 16.5
(3.28-5.04) (3.94-5.94) (4.96-7.54) (5.76-8.99) (6.76-11.1) (7.50-13.0) F(9.02-17.1) (10.1-20.4) (10.9-23.0)
4-day 4.32 5.18 6.52 7.68 9.34 10.7 12.1 13.6 15.8 17.6
(3.48-5.30) (4.18-6.25) (5.28-7.94) (6.13-9.47) (7.20-11.8) (7.99-13.7) F(879-15.8) 1 (10.8-21.6) 11 (11.6-24.4)
7-day 4.80 5.78 7.30 8.62 10.5 12.1 13.7 15.5 18.0 20.0
(3.90-5.84) (4.70-6.90) (5.96-8.81) (6.94-10.5) (8.18-13.1) (9.09-15.3) (10.0-17.7) 1 (11.0-20.3) 11 (12.3-24.2) (13.3-27.4)
10-day 5.23 6.29 7.95 9.40 11.5 13.1 ) 14.9 ) ( 16.8 ) ( 19.6 21.8
(4.27-6 31) (5.15-7.48) (6.53-9.55) (7.60-11.4) (8.95-14.2) (9.94-16.6 (10.9-19.1 12.0-22.0 13.4-26.1) (14.5-29.6)
20-day 6.75 7.98 9.95 11.6 14.0 15.8 17.8 19.9 23.0 25.5
(5.57-8.05) (6.63-9.42) (8.26-11.8) (9.49-14.0) (11.0-17.1) (12.1-19.6) (13.1-22.5) (14.3-25.6) (15.9-30.3) (17.1-34.1)
30-day 8.03 9.41 11.6 13.5 16.1 18.1 20.2 22.5 25.8 28.6
(6.67-9.52) (7.88-11.1) (9.72-13.7) (11.1-16.1) (12.7-19.5) (13.8-22.3) (15.0-25.3) (16.3-28.7) (17.9-33.7) (19.2-37.8)
[�-:d:a7y 9.83 11.5 14.1 16.4 19.5 21.9 24.4 27.1 30.8 33.8
(8.21-11.6) (9.66-13.4) (11.9-16.6) (13.5-19.4) (15.5-23.5) (16.9-26.8) (18.3-30.4) (19.7-34.3) (21.5-39.8) (22.9-44.4)
60-day 11.4 16.4 19.0 22.7 25.5 28.5 31.535.6 38.8
(9.58-13.4) [;%;]
(13.8-19.1) (15.8-22.4) (18.1-27.2) (19.8-31.1) (21.4-35.2) (22.9-39.6) (24.9-45.7) (26.3-50.6)
Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS).
Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval. The probability that precipitation frequency
estimates (for a given duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at
upper bounds are not checked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values.
Please refer to NOAA Atlas 14 document for more information.
https://hdsc. nws. noaa. gov/hdsc/pfds/pfds_printpage.html?lat=32.9522&Ion=-97.1965&data=depth&units=english&series=pds 1 /4
9/28/21, 3:06 PM
Precipitation Frequency Data Server
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PF graphical
Average recurrence
interval
{years}
— 1
2
— 5
— 1Q
25
50
100
200
540
1400
Duration
— 5-min
— 2-day
— 10-mtn
— 3-day
15-mtn
— 4-day
— 30-min
— 7-day
— 60-min
— 1 "ay
— 2fir
— 20-day
— 3fir
— 30--day
— 6-I1r
— 45-day
— 12-hr
— 60-day
24-hr
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Maps & aerials
Small scale terrain
"kylestiake
rt
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Ik ete r
r
3km
2mi?
Large scale terrain
https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=32.9522&Ion=-97.1965&data=depth&units=english&series=pds 2/4
9/28/21, 3:06 PM Precipitation Frequency Data Server
i
Wichita falls
Denton
I# Plano
Fort Worth Arlington
Dallas
:ne
100km
60mi
Large scale map
Wichita FallG
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100km
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Precipitation Frequency Data Server
US Department of Commerce
National Oceanic and Atmospheric Administration
National Weather Service
National Water Center
1325 East West Highway
Silver Spring, MD 20910
Questions?: HDSC.Questions@noaa.gov
Disclaimer
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EXISTING TRAVEL TIME CALCULATIONS
Basin Data
Overland Flow
Shallow Concentrated Flow
Channel/Street Flow
Basin Name
Calculated Longest
Flowpath (ft)
Length
(ft)
lope
(ft/ft)
Surface Type
Manning's n
To (min)
Length
(ft)
Slope
(ft/ft)
Surface Type
K
Ts (min)
1
Length
(ft)
Slope
(ft/ft)
Manning's n
Area (ft2)
WP (ft)
Channel
Velocity (f/s)
Tx (min)
Time of Cone.
Cale. (min)
Lag Time
(min)
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
(12)
(13)
(14)
X-Section Type
(15)
(16)
(17)
(19)
(20)
(21)
A 365
100
0.030
Dense —Grass
0.240
11.44
265
0.045
unpaved 16.1
1.29
0
0.050
Channel
3.00
0.00
Total To (min)=
11.44
Total Ts (min)=
1.29
Total Tn (min)=
0.00
12.73
7.6
OS-1 10819
100
0.020
Dense —Grass
0.240
13.45
320
0.063
unpaved 16.1
1.32
1177
0.050
Channel
3.00
6.54
2156
0.013
Conduit
6.00
5.99
7066
0.050
Channel
3.00
39.26
Total To (min)=
13.45
Total Ts (min)=
1.32
Total Tn (min)=
51.78
66.56
39.9
Lag_Time_calculations
Existing CN Calculations
FID Label
307 A
309 A
Acres CATEGORY
0.098021 Open Space
0.320519 Open Space
HYDRO
A
B
39
61
3.822819
19.55166
306 A
0.130686 Open Space
C
74
9.670764
308 A
0.366179 Open Space
D
80
29.29432
Sub -Total A
191 OS-1
193 OS-1
0.915405
jIML 0.50641 Commercial
0.0150403 Commercial
A
A
68
89
89
62.33956
45.07049
1.338587
195 OS-1
0.117734 Commercial
A
89
10.47833
200 OS-1
0.131635 Commercial
A
89
11.71552
205 OS-1
0.485397 Commercial
B
92
44.65652
213 OS-1
0.484185 Commercial
B
92
44.54502
214 OS-1
0.395292 Commercial
B
92
36.36686
219 OS-1
0.0025773 Commercial
B
92
0.237112
220 OS-1
0.118572 Commercial
B
92
10.90862
300 OS-1
0.0609226 Commercial
B
92
5.604879
190 OS-1
0.890755 Commercial
C
94
83.73097
192 OS-1
2.42296 Commercial
C
94
227.7582
194 OS-1
2.885 Commercial
C
94
271.19
196 OS-1
0.000721 Commercial
C
94
0.067774
197 OS-1
2.14727 Commercial
C
94
201.8434
199 OS-1
2.56355 Commercial
C
94
240.9737
201 OS-1
1.19188 Commercial
C
94
112.0367
202 OS-1
2.12288 Commercial
C
94
199.5507
203 OS-1
0.466663 Commercial
C
94
43.86632
207 OS-1
0.760636 Commercial
C
94
71.49978
208 OS-1
2.0053999 Commercial
C
94
188.5076
210 OS-1
0.248666 Commercial
C
94
23.3746
215 OS-1
1.4568599 Commercial
C
94
136.9448
217 OS-1
0.214247 Commercial
C
94
20.13922
222 OS-1
3.4768801 Commercial
C
94
326.8267
225 OS-1
0.128841 Commercial
C
94
12.11105
226 OS-1
3.6589401 Commercial
C
94
343.9404
253 OS-1
4.13831 Commercial
C
94
389.0011
298 OS-1
0.412731 Commercial
C
94
38.79671
305 OS-1
189 OS-1
198 OS-1
_ 0.551678 Commercial
_ 2.9697399 Commercial
2.17398 Commercial
C
D
D
94
95
95
51.85773
282.1253
206.5281
204 OS-1
0.527528 Commercial
D
95
50.11516
206 OS-1
9.4230804 Commercial
D
95
895.1926
209 OS-1
10.4863005 Commercial
D
95
996.1985
211 OS-1
0.703521 Commercial
D
95
66.8345
212 OS-1
1.27714 Commercial
D
95
121.3283
216 OS-1
0.93374 Commercial
D
95
88.7053
218 OS-1
0.0712725 Commercial
D
95
6.770888
Existing CN Calculations
221
Label Acres
OS-1
0.504011
CATEGORYFID
Commercial
D•O
D
95
47.88105
223
OS-1
0.0238991
Commercial
D
95
2.270415
224
OS-1
0.690119
Commercial
D
95
65.56131
227
OS-1
0.582004
Commercial
D
95
55.29038
252
OS-1
1.37475
Commercial
D
95
130.6013
254
OS-1
0.258911
Commercial
D
95
24.59655
299
OS-1
0.559841
Commercial
D
95
53.1849
184
OS-1
5.3989301
Mobile home
B
85
458.9091
188
OS-1
8.0878801
Mobile home
B
85
687.4698
180
OS-1
2.1276901
Mobile home
C
90
191.4921
185
OS-1
1.32226
Mobile home
C
90
119.0034
186
OS-1
5.6022201
Mobile home
C
90
504.1998
179
OS-1
0.0247754
Mobile home
D
92
2.279337
187
OS-1
1.7370501
Mobile home
D
92
159.8086
35
OS-1
0.945823
Open Space
A
39
36.8871
242
OS-1
1.42024
Open Space
A
39
55.38936
246
OS-1
2.0357101
Open Space
A
39
79.39269
257
OS-1
0.10206
Open Space
B
61
6.22566
258
OS-1
0.0962874
Open Space
B
61
5.873531
259
OS-1 IF
0.119923
Open Space
B
61
7.315303
260
261
273
OS-1
OS-1 I
OS-1
0.149101
0.0237148
0.306096
Open Space
Open Space
Open Space
B
B
B
61
61
61
9.095161
1.446603
18.67186
276
OS-1
0.326128
Open Space
B
61
19.89381
287
OS-1
0.133697
Open Space
B
61
8.155517
34
OS-1
0.603221
Open Space
C
74
44.63835
241
OS-1
1.13085
Open Space
C
74
83.6829
245
OS-1
1.5083801
Open Space
C
74
111.6201
264
OS-1
9.7018404
Open Space
C
74
717.9362
267
OS-1
1.50976
Open Space
C
74
111.7222
269
OS-1
0.611525
Open Space
C
74
45.25285
270
OS-1
0.282481
Open Space
C
74
20.90359
274
OS-1
1.08527
Open Space
C
74
80.30998
301
OS-1
2.4042201
Open Space
C
74
177.9123
243
OS-1
0.023724
Open Space
D
80
1.89792
244
OS-1
0.0085256
Open Space
D
80
0.682048
262
OS-1
0.638384
Open Space
D
80
51.07072
265
OS-1
0.200344
Open Space
D
80
16.02752
266
OS-1
1.78627
Open Space
D
80
142.9016
271
OS-1
0.0000143
Open Space
D
80
0.001144
272
OS-1
0.407678
Open Space
D
80
32.61424
275
OS-1
0.18804
Open Space
D
80
15.0432
280
OS-1
0.557376
Open Space
D
80
44.59008
283
OS-1
0.179224
Open Space
D
80
14.33792
286
OS-1
0.545814
Open Space
D
80
43.66512
Existing CN Calculations
FID Label
297 OS-1
302 OS-1
Acres CATEGORY
0.359177 Open Space
0.750463 Open Space
HYDRO
D
D
80
80
28.73416
60.03704
303 OS-1
0.849996 Open Space
D
80
67.99968
263 OS-1
0.873542 Open Space
Water
98
85.60712
232 OS-1
0.673722 Parks/recreation
39
26.27516
231 OS-1
16 OS-1
1 OS-1
0.64981 Parks/recreation
1.07525 ROW
1.54544 ROW
C
A
B
74
83
89
48.08594
89.24575
137.5442
2 OS-1
24.9106007 ROW
B
89
2217.043
11 OS-1
0.2716 ROW
B
89
24.1724
17 OS-1
2.62356 ROW
B
89
233.4968
20 OS-1
7.1996999 ROW
B
89
640.7733
21 OS-1
1.2079099 ROW
B
89
107.504
29 OS-1
0.0065058 ROW
B
89
0.579016
30 OS-1
11.5105 ROW
B
89
1024.435
3 OS-1
0.658251 ROW
C
92
60.55909
5 OS-1
0.0907257 ROW
C
92
8.346764
6 OS-1
4.4772902 ROW
C
92
411.9107
8 OS-1
2.5950501 ROW
C
92
238.7446
10 OS-1
26.5035992 ROW
C
92
2438.331
304 OS-1
0.528579 ROW
C
92
48.62927
0 OS-1
0.490802 ROW
D
93
45.64459
4 OS-1
1.26943 ROW
D
93
118.057
7 OS-1
1.97677 ROW
D
93
183.8396
9 OS-1
0.94677 ROW
D
93
88.04961
12 OS-1
0.576872 ROW
D
93
53.6491
13 OS-1
1.20357 ROW
D
93
111.932
14 OS-1
0.0162683 ROW
D
93
1.512952
15 OS-1
1.3886 ROW
D
93
129.1398
18 OS-1
0.900888 ROW
D
93
83.78258
19 OS-1
0.720986 ROW
D
93
67.0517
22 OS-1
1.9164701 ROW
D
93
178.2317
23 OS-1
3.0310199 ROW
D
93
281.8849
24 OS-1
0.771433 ROW
D
93
71.74327
25 OS-1
1.32793 ROW
D
93
123.4975
26 OS-1
27 OS-1
28 OS-1
0.976538 ROW
_ 1.53385 ROW
2.23507 ROW
D
D
D
93
93
93
90.81803
142.6481
207.8615
31 OS-1
2.4072299 ROW
D
93
223.8724
49 OS-1
0.17002 Single family
A
61
10.37122
54 OS-1
2.4640801 Single family
A
61
150.3089
250 OS-1
5.7163301 Single family
A
61
348.6961
38 OS-1
0.925961 Single family
B
75
69.44708
39 OS-1
0.0003308 Single family
B
75
0.02481
45 OS-1
0.66013 Single family
B
75
49.50975
Existing CN Calculations
FID Label
56 OS-1
Acres CATEGORY
8.3401003 Single family
HYDRO
B
75
625.5075
66 OS-1
0.0499132 Single family
B
75
3.74349
68 OS-1
6.1704302 Single family
B
75
462.7823
72 OS-1
0.222243 Single family
B
75
16.66823
73 OS-1
6.96907 Single family
B
75
522.6803
75 OS-1
5.3699398 Single family
B
75
402.7455
78 OS-1
0.369321 Single family
B
75
27.69908
79 OS-1
3.8566899 Single family
B
75
289.2517
82 OS-1
0.094499 Single family
B
75
7.087425
84 OS-1
0.740987 Single family
B
75
55.57403
85 OS-1
2.9184599 Single family
B
75
218.8845
88 OS-1
0.169412 Single family
B
75
12.7059
92 OS-1
2.1430099 Single family
B
75
160.7257
93 OS-1
1.99949 Single family
B
75
149.9618
96 OS-1
7.10992 Single family
B
75
533.244
97 OS-1
2.06705 Single family
B
75
155.0288
106 OS-1
0.0760451 Single family
B
75
5.703383
109 OS-1
1.97999 Single family
B
75
148.4993
110 OS-1
2.2469299 Single family
B
75
168.5197
114 OS-1
2.77491 Single family
B
75
208.1183
116 OS-1
119 OS-1
120 OS-1
0.157509 Single family
3.45594 Single family
1.21556 Single family
B
B
B
75
75
75
11.81318
259.1955
91.167
121 OS-1
21.7583008 Single family
B
75
1631.873
127 OS-1
15.6513004 Single family
B
75
1173.848
128 OS-1
10.8638 Single family
B
75
814.785
130 OS-1
0.599598 Single family
B
75
44.96985
134 OS-1
13.9329004 Single family
B
75
1044.968
135 OS-1
3.0098 Single family
B
75
225.735
137 OS-1
2.2516201 Single family
B
75
168.8715
139 OS-1
4.2119398 Single family
B
75
315.8955
140 OS-1
2.54476 Single family
B
75
190.857
141 OS-1
2.5064499 Single family
B
75
187.9837
143 OS-1
0.825563 Single family
B
75
61.91723
146 OS-1
7.4602499 Single family
B
75
559.5187
147 OS-1
2.17926 Single family
B
75
163.4445
151 OS-1
3.5511899 Single family
B
75
266.3392
152 OS-1
2.7906699 Single family
B
75
209.3002
155 OS-1
2.2299299 Single family
B
75
167.2447
157 OS-1
0.692822 Single family
B
75
51.96165
158 OS-1
25.5475006 Single family
B
75
1916.063
160 OS-1
26.6989994 Single family
B
75
2002.425
162 OS-1
3.06867 Single family
B
75
230.1503
165 OS-1
1.30931 Single family
B
75
98.19825
166 OS-1
1.15777 Single family
B
75
86.83275
Existing CN Calculations
FID Label
167 OS-1
168 OS-1
172 OS-1
Acres CATEGORY
0.670137 Single family
45.0410004 Single family
1.20728 Single family
HYDRO
B
B
B
75
75
75
50.26028
3378.075
90.546
173 OS-1
8.9081898 Single family
B
75
668.1142
176 OS-1
1.04401 Single family
B
75
78.30075
181 OS-1
183 OS-1
233 OS-1
3.1614399 Single family
I 0.0532236 Single family
1.5909899 Single family
B
B
B
75
75
75
237.108
3.99177
119.3242
236 OS-1
1.22426 Single family
B
75
91.8195
239 OS-1
0.659347 Single family
B
75
49.45103
251 OS-1
2.1974599 Single family
B
75
164.8095
277 OS-1
1.15992 Single family
B
75
86.994
279 OS-1
0.731411 Single family
B
75
54.85583
285 OS-1
0.072134 Single family
B
75
5.41005
289 OS-1
0.269797 Single family
B
75
20.23478
37 OS-1
4.2251401 Single family
C
83
350.6866
40 OS-1
0.850309 Single family
C
83
70.57565
47 OS-1
1.51414 Single family
C
83
125.6736
53 OS-1
6.0002298 Single family
C
83
498.0191
58 OS-1
0.329147 Single family
C
83
27.3192
61 OS-1
0.0037724 Single family
C
83
0.313109
64 OS-1
1.32408 Single family
C
83
109.8986
70 OS-1
1.40039 Single family
C
83
116.2324
74 OS-1
0.766809 Single family
C
83
63.64515
76 OS-1
7.4305401 Single family
C
83
616.7348
80 OS-1
0.329656 Single family
C
83
27.36145
86 OS-1
5.8403602 Single family
C
83
484.7499
89 OS-1
9.0230799 Single family
C
83
748.9156
91 OS-1
0.42382 Single family
C
83
35.17706
94 OS-1
0.017149 Single family
C
83
1.423367
99 OS-1
3.35377 Single family
C
83
278.3629
102 OS-1
1.15479 Single family
C
83
95.84757
103 OS-1
2.2816899 Single family
C
83
189.3803
105 OS-1
0.155415 Single family
C
83
12.89945
107 OS-1
1.98798 Single family
C
83
165.0023
111 OS-1
115 OS-1
117 OS-1
_ 5.9538002 Single family
_ 0.0294119 Single family
0.705256 Single family
C
C
C
83
83
83
494.1654
2.441188
58.53625
122 OS-1
3.9525399 Single family
C
83
328.0608
123 OS-1
14.1892004 Single family
C
83
1177.704
131 OS-1
7.7927899 Single family
C
83
646.8016
132 OS-1
6.4439101 Single family
C
83
534.8445
136 OS-1
0.93854 Single family
C
83
77.89882
142 OS-1
0.283777 Single family
C
83
23.55349
144 OS-1
2.29353 Single family
C
83
190.363
Existing CN Calculations
FID Label
148 OS-1
Acres CATEGORY
0.375396 Single family
HYDRO
C
83
31.15787
149 OS-1
1.3239501 Single family
C
83
109.8879
153 OS-1
1.90396 Single family
C
83
158.0287
154 OS-1
1.94139 Single family
C
83
161.1354
161 OS-1
6.4387298 Single family
C
83
534.4146
163 OS-1
2.45836 Single family
C
83
204.0439
164 OS-1
1.9027801 Single family
C
83
157.9307
169 OS-1
14.8936996 Single family
C
83
1236.177
170 OS-1
1.22877 Single family
C
83
101.9879
174 OS-1
0.578944 Single family
C
83
48.05235
175 OS-1
2.6995599 Single family
C
83
224.0635
177 OS-1
2.17696 Single family
C
83
180.6877
178 OS-1
0.010452 Single family
C
83
0.867516
234 OS-1
13.6162004 Single family
C
83
1130.145
240 OS-1
0.401068 Single family
C
83
33.28864
249 OS-1
9.60252 Single family
C
83
797.0092
255 OS-1
0.687024 Single family
C
83
57.02299
268 OS-1
1.17715 Single family
C
83
97.70345
278 OS-1
0.838162 Single family
C
83
69.56745
284 OS-1
0.572587 Single family
C
83
47.52472
32 OS-1
33 OS
36 OS-1
0.0015609 Single family
0.000325 Single family
0.77603 Single family
D
D
D
87
87
87
0.135798
0.028275
67.51461
41 OS-1
6.4102998 Single family
D
87
557.6961
42 OS-1
2.2734399 Single family
D
87
197.7893
43 OS-1
0.0142975 Single family
D
87
1.243883
44 OS-1
3.3283 Single family
D
87
289.5621
46 OS-1
5.0897799 Single family
D
87
442.8109
48 OS-1
2.5315199 Single family
D
87
220.2422
50 OS-1
5.1108298 Single family
D
87
444.6422
51 OS-1
5.2151399 Single family
D
87
453.7172
52 OS-1
3.1648099 Single family
D
87
275.3385
55 OS-1
0.0145538 Single family
D
87
1.266181
57 OS-1
0.0001284 Single family
D
87
0.011171
59 OS-1
0.10277 Single family
D
87
8.94099
60 OS-1
2.8178 Single family
D
87
245.1486
62 OS-1
0.640069 Single family
D
87
55.686
63 OS-1
0.0981605 Single family
D
87
8.539964
65 OS-1
0.36664 Single family
D
87
31.89768
67 OS-1
0.0639194 Single family
D
87
5.560988
69 OS-1
0.84539 Single family
D
87
73.54893
71 OS-1
1.47243 Single family
D
87
128.1014
77 OS-1
0.643915 Single family
D
87
56.02061
81 OS-1
0.0014946 Single family
D
87
0.13003
83 OS-1
0.973359 Single family
D
87
84.68223
Existing CN Calculations
FID Label
87 OS-1
90 OS-1
95 OS-1
Acres CATEGORY
3.6313601 Single family
1.08592 Single family
4.8779602 Single family
HYDRO
D
D
D
87
87
87
315.9283
94.47504
424.3825
98 OS-1
0.0007719 Single family
D
87
0.067155
100 OS-1
0.873806 Single family
D
87
76.02112
101 OS-1
104 OS-1
108 OS-1
0.776732 Single family
1.62493 Single family
1.1436501 Single family
D
D
D
87
87
87
67.57568
141.3689
99.49756
112 OS-1
0.0428427 Single family
D
87
3.727315
113 OS-1
1.20138 Single family
D
87
104.5201
118 OS-1
0.299403 Single family
D
87
26.04806
124 OS-1
9.7414303 Single family
D
87
847.5044
125 OS-1
0.871433 Single family
D
87
75.81467
126 OS-1
8.77211 Single family
D
87
763.1736
129 OS-1
2.3843701 Single family
D
87
207.4402
133 OS-1
5.0348902 Single family
D
87
438.0354
138 OS-1
0.029216 Single family
D
87
2.541792
145 OS-1
1.17787 Single family
D
87
102.4747
150 OS-1
4.2959299 Single family
D
87
373.7459
156 OS-1
0.263678 Single family
D
87
22.93999
159 OS-1
J1 0.400732 Single family
D
87
34.86368
171 OS-1
0.0187703 Single family
D
87
1.633016
182 OS-1
IF 0.271785 Single family
D
87
23.6453
235 OS-1
0.403174 Single family
D
87
35.07614
237 OS-1
4.5275302 Single family
D
87
393.8951
238 OS-1
10.9651003 Single family
D
87
953.9637
247 OS-1
1.73821 Single family
D
87
151.2243
248 OS-1
2.3062301 Single family
D
87
200.642
256 OS-1
1.12046 Single family
D
87
97.48002
288 OS-1
0.919304 Single family
D
87
79.97945
282 OS-1
0.717572 Small water bodies
B
98
70.32206
295 OS-1
1.4145 Small water bodies
B
98
138.621
296 OS-1
1.5185601 Small water bodies
B
98
148.8189
281 OS-1
0.230295 Small water bodies
C
98
22.56891
290 OS-1
0.57831 Small water bodies
C
98
56.67438
292 OS-1
293 OS-1
294 OS-1
_ 0.440966 Small water bodies
_ 0.0342496 Small water bodies
0.010544 Small water bodies
C
D
D
98
98
98
43.21467
3.356461
1.033312
291 OS-1
2.2005799 Small water bodies
Water
98
215.6568
228 OS-1
0.565701 Utilities
B
88
49.78169
230 OS-1
0.649001 Utilities
B
88
57.11209
229 OS-1
3.85748 Utilities
D
93
358.7456
Sub -Total OS-1
807.072428
82
66404.98
PROPOSED TRAVEL TIME CALCULATIONS
Basin Data
Overland Flow
Shallow Concentrated Flow
Channel/Street Flow
Basin Name
Calculated Longest
Flowpath (ft)
(1)
Length
(ft)
(2)
lope
(ft/ft)
(3)
Surface Type
(4)
Manning's n
(5)
To (min)
(6)
Length
(ft)
(7)
Slope
(ft/ft)
(8)
Surface Type
(9)
K
(10)
Ts (min)
1 (11)
Length
(ft)
(12)
Slope
(ft/ft)
(13)
Manning's n
(14)
X-Section Type
Area (ft2)
(15)
WP (ft)
(16)
Channel
Velocity (f/s)
(17)
Tx (min)
(19)
Time of Cone.
Cale. (min)
(20)
Lag Time
(min)
(21)
A 365
50 0.010
Concrete 0.015
Total To (min)=
1.11
1.11
315
0.020
paved 20.3
Total Ts (min)=
1.83
1.83
0 0.050
Channel 3.00
Total Tn (min)=
0.00
0.00
2.94
1.8
Lag_Time_calculations
CN Calculations
307 A
309 A
0.098021 Commercial
0.320519 Commercial
A
B
89
92
8.723869
29.48775
306 A
0.130686 Commercial
C
94
12.28448
308 A
0.366179 Commercial
D
95
34.78701
Sub -Total A
0.915405
93
85.28311
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Appendix D — Hydraulic Data
Flood Study
HTeaO — Southlake, TX
October 28, 2021
190_Davis_Blvd Plan: Corrected —Existing 9/29/2021
BB-9 BB-9 "I
642
Legend
--------- X-
WS 500-Year
WS 100- reaY
640
WS 50-Year
WS 10-Year
■
Ground
638
636
c
634
w
632
630
628
626
0 200 400 600 800 1000 1200
Main Channel Distance (ft)
w
w
0 200
0
100
07
190_Davis_Blvd Plan: Corrected —Existing 9/29/2021
IRS = 7499 Equivalent to Effective XS 7412
07 J9 .06 1, 07
400 600 800 1000 1200
Station (ft)
190_Davis_Blvd Plan: Corrected —Existing 9/29/2021
IRS = 7305
til' .06 -I" .07
200 300 400
Station (ft)
500
Legend
WS 500-Year
WS 100-Year
WS 50-Year
WS 10-Year
■
Ground
•
Bank Sta
1400
600
Legend
WS 500-Year
WS 100-Year
WS 50-Year
WS 10-Year
■
Ground
•
Bank Sta
190_Davis_Blvd Plan: Corrected —Existing 9/29/2021
RS = 7222
.07 " .06 .07 A
650
Legend
WS 500-Year
645
�
WS 100-Year
WS 50-Year
640
WS 10-Year
0
>
Ground
w
635
•
Bank Sta
630
625
0
100 200 300 400 500
600
Station (ft)
190_Davis_Blvd Plan: Corrected —Existing 9/29/2021
RS = 7091
.07 n'" .06 .07
646
Legend
644
WS 500-Year
642
WS 100 reaY
640
WS 50-Year
638
WS 10-Year
0
—
CU
636
■
Ground
w
634
•
Bank Sta
632
630
628
0
100 200 300 400 500
600
Station (ft)
190_Davis_Blvd Plan: Corrected —Existing 9/29/2021
RS = 6928
.07 .06 .07
646
Legend
644
WS 500-Year
642
WS 100 reaY
640
WS 50-Year
638
WS 10-Year
0
-AF■
CU
636
Ground
w
634
•
Bank Sta
632
630
628
0
100 200 300 400 500
600
Station (ft)
190_Davis_Blvd Plan: Corrected -Existing 9/29/2021
RS = 6774
07 ;J , .06 07
"�
646
Legend
644
WS 500-Year
642
WS 100 reaY
640
WS 50-Year
638
WS 10-Year
0
-
CU
636
■
Ground
w
634
•
Bank Sta
632
630
628
0
100 200 360 400 500
600
Station (ft)
190_Davis_Blvd
Plan: Corrected —Existing 9/29/2021
RS = 6674
07
.06 =I' 07
646
Legend
644
WS 500-Year
642
WS 100 reaY
640
WS 50-Year
C
638
WS 10-Year
—
—
636
■
Ground
w
634
•
Bank Sta
632
630
628
0
100 200
300 400 500
600
Station (ft)
190_Davis_Blvd
Plan: Corrected —Existing 9/29/2021
RS = 6490 Effective XS E
.07
J_O&�— .07
680
Legend
670
WS 500-Year
WS 100 reaY
660
WS 50-Year
WS 10-Year
°
650
■
>
Ground
2
w
640
Bank Sta
630
620
0
200 400
600 800 1000
1200
Station (ft)
rn
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Z
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M
Z
Appendix E — Construction Plans
Flood Study
HTeaO — Southlake, TX
October 28, 2021
Page is too large to OCR.
rn
Z
Z
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M
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Appendix F — Electronic Data
Flood Study
HTeaO — Southlake, TX
October 28, 2021