SW3231101_Design Calculations_20231102 (2)

STORM DRAINAGE CALCULATIONS
AURORA AT PRICE MILL CREEK
Prepared for:
SHEA HOMES CAROLINA, LLC
8800 N. Gainey Center Drive, Suite 350
Scottsdale, AZ 85258
Prepared by:
ESP Associates, Inc.
20484 Chartwell Center Drive, Suite D
Cornelius, NC 28031
[phone] r9AR11,,
=osioN.!2''
Project Number: KT37.400
SEAL
043160 =
Original: August 15, 2023 aj+rl�3
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ESP
License No. F-1407

Rainfall Data

NO AA Atlas 14,Volume 2,Version 3
Location name:Wesley Chapel,North Carolina,
USA* sr none
• .4:3 • Latitude:35.007°, Longitude: -80.6837°
\MP/ Elevation:579 ft** •
°' *°` *source:ESRI M aps 'n
**source:USG S
PO NT PRECIPITATIO NFREQ U=NCY ESTIMATES
G M.Bonnin,D.Matin,B.Lin,T.Parzybok,M Yekta,and D.Riley
NO PA,National Weather Service,Silver Spring,M ayland
PF tabular I PF graphical I Maps & aerials
PF tabular
PDS-based point precipitation frequency estimates w th 90% confidence intervals (in inches/hour)1
Average recurrence interval(years)
Duration -
1 2 51 0 2 5 5 0 1 00 2 00 5 00 1 000
5-min 5.02 5.93 6.88 7.58 8.38 8.93 9.43 9.88 10.4 10.8
(4.63-5.45) (5.46-6.46) (6.32-7.49) (6.95-8.23) (7.64-9.08) (8.11-9.67) (8.52-10.2) (8.88-10.7) (9.26-11.3) (9.50-11.7)
10-m n 4.01 4.74 5.51 6.06 6.67 7.10 7.49 7.83 8.21 8.46
(3.70-4.36) (4.36-5.17) (5.06-6.00) (5.56-6.58) (6.09-7.24) (6.46-7.70) (6.77-8.11) (7.04-8.49) (7.32-8.93) (7.49-9.22)
15-m it 3.34 3.98 4.65 5.11 5.64 6.00 6.31 6.58 6.89 7.08
(3.08-3.63) (3.66-4.33) (4.27-5.06) (4.68-5.55) (5.15-6.11) (5.45-6.50) (5.70-6.84) (5.92-7.14) (6.14-7.49) 1 (6.26-7.71)
30-m it 2.29 2.74 3.30 3.70 4.18 4.52 4.83 5.13 5.48 5.73
(2.11-2.49) (2.52-2.99) (3.03-3.59) (3.39-4.02) (3.81-4.53)_ (4.10-4.89) (4.37-5.24) (4.61-5.56) (4.89-5.96) (5.07-6.24)
60-m n 1.43 1.72 2.12 2.41 2.78 3.06 3.33 3.59 3.93 4.18
(1.32-1.55) (1.58-1.88) (1.94-2.30) (2.21-2.62) (2.54-3.01) (2.78-3.32) (3.01-3.61) (3.23-3.90) (3.51-4.28) (3.70-4.56)
2-hr 0.825 0.998 1.24 1.42 1.66 1.83 2.01 2.19 2.42 2.60
(0.756-0.902) (0.914-1.09) (1.13-1.35) (1.29-1.55) (1.50-1.80) (1.66-2.00) (1.81-2.19) (1.96-2.39) (2.14-2.64) (2.28-2.84)
3-hr 0.584 0.704 0.879 1.01 1.20 1.34 1.49 1.64 1.84 2.00
(0.534-0.642) (0.645-0.775) (0.803-0.966) (0.923-1.11) (1.08-1.31) (1.21-1.46) (1.33-1.62) (1.45-1.78) (1.61-2.01) (1.74-2.19)
6-hr 0.351 0.424 0.529 0.612 0.725 0.815 0.907 1.00 1.13 1.24
(0.322-0.386) (0.388-0.465) (0.484-0.580) (0.558-0.670) (0.657-0.790) (0.734-0.887) (0.811-0.987) (0.888-1.09) (0.991-1.23) (1.07-1.35)
12-hr 0.206 0.249 0.312 0.363 0.433 0.490 0.549 0.612 0.699 ' 0.769
(0.189-0.226) (0.229-0.274) (0.286-0.343) (0.331-0.398) (0.393-0.473) (0.441-0.534) (0.489-0.598) (0.538-0.665) (0.605-0.759)1(0.658-0.836)
24-hr 0.122 0.148 0.186 0.216 0.258 0.291 0.327 0.363 0.415 0.456
(0.113-0.132) (0.137-0.160) (0.171-0.201) (0.199-0.234) (0.236-0.279) (0.267-0.316) (0.298-0.354) (0.330-0.394) (0.374-0.450) (0.409-0.497)
2-day 0.072 0.086 0.108 0.125 0.149 0.168 0.188 0.208 0.237 0.260
(0.066-0.078) (0.080-0.094) (0.100-0.117) (0.115-0.136) (0.137-0.161)i(0.154-0.182) (0.171-0.204) (0.189-0.227) (0.214-0.259) (0.233-0.285)
3-day 0.051 0.061 0.076 0.087 0.104 0.117 0.130 0.145 0.164 0.180
(0.047-0.055) (0.056-0.066) (0.070-0.082) (0.081-0.095) (0.095-0.112) (0.107-0.127) (0.119-0.141) (0.132-0.157) (0.149-0.179) (0.162-0.197)
4-day 0.040 0.048 0.059 0.069 0.081 0.091 0.102 0.113 0.128 0.140
(0.037-0.043) (0.045-0.052) (0.055-0.064) (0.063-0.074) (0.075-0.088) (0.084-0.099) (0.093-0.110) (0.103-0.122) (0.116-0.139) (0.127-0.153)I
7-day 0.026 0.031 0.038 0.044 0.052 0.058 0.064 0.071 0.080 0.088
(0.025-0.028) (0.029-0.034) (0.036-0.041) (0.041-0.047) (0.048-0.056) (0.054-0.062) (0.059-0.069) (0.065-0.076) (0.074-0.087) (0.080-0.095)
10-day 0.021 0.025 0.030 0.034 0.040 0.044 0.049 ' 0.053 0.060 0.065
(0.020-0.022) (0.023-0.027) (0.028-0.032) (0.032-0.037) (0.037-0.043) (0.041-0.047) (0.045-0.052) (0.049-0.057) (0.055-0.064) (0.059-0.070)
20-day 0.014 0.016 0.020 0.022 0.025 0.028 0.030 0.033 0.037 0.040
(0.013-0.015) (0.015-0.018) (0.018-0.021) (0.021-0.023) (0.024-0.027) (0.026-0.030) (0.028-0.033) (0.031-0.035) (0.034-0.039) (0.036-0.042)
30-day 0.011 0.013 0.016 0.017 0.020 0.021 l 0.023 I 0.025 0.027 0.029
(0.011-0.012) (0.013-0.014) (0.015-0.017) (0.016-0.018) (0.018-0.021) (0.020-0.023) (0.022-0.025) (0.023-0.027) (0.025-0.029) (0.027-0.031)i
45-day 0.009 0.011 0.013 0.014 0.016 0.017 0.018 0.019 0.021 0.022
(0.009-0.010) (0.010-0.012) (0.012-0.013) (0.013-0.015) (0.015-0.016) (0.016-0.018) (0.017-0.019) (0.018-0.020) (0.020-0.022) (0.021-0.023)
60-day 0.008 0.010 0.011 0.012 0.014 0.015 0.015 0.016 0.018 0.019
(0.008-0.009) (0.009-0.010) (0.011-0.012) (0.012-0.013) (0.013-0.014)�(0.014-0.015) (0.015-0.016) (0.016-0.017) (0.017-0.019) (0.017-0.020)
1 Precipitation frequency(PF)estimates in this table are based on frequency analysis of partial duration series(PDS).
Num hers in parenthesis are PF estimates at lower and upper bounds of the 90%confidence interval.The probability that precipitation frequency estim des(for
a given duration and average recurrence interval)will be greater than the upper bound(or less than the lower bound)is 5%.Estim des at upper bounds are not
checked against probable m acim trn precipitation(PM P)estimates and m ay be higher than currently valid PM Pvalues.
Please refer to NO PA Atlas 14 docum eit form cre information.
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PF graphical

PDS-based intensity-duration-frequency (IDF) curves
Latitude: 35.0070°, Longitude: -80.6837°
101 - - Average recurrence
� interval
-__ (years)
L
C — 1
�' 10° - \ \\ 2
u, \ — 6
✓ \ — 10
— — 25
o \. — 50
O 10-1 - \ �� — 100
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6- — 500
` - —0.
1000
10-2 _
r I I I 1 I I I I I I
C C C C l T TT A (1, T T TT
•E .E •E .E .E L L L L , f0 f0 f0 r0 r0 N N N N
V1 O m Duration N ry r` o N m v
101 -
i_
L
C
Duration
Z' 10°
c — 5-min — 2-day
. — 10-min — 3-day
c 15-rnln — 4-day
0
ro
▪ 10-1 - — 30-min — 7-day
a — 60-min — 10-day
.� — 2fir — 20 day
a` — 3fir — 30-day
— 6fir — 45-day
10-2 - — 12-hr — 60-day
I r r r r r I 24-hr
1 2 5 10 25 50 100 200 500 1000
Average recurrence interval (years)
NOAA Atlas 14,Volume 2,Version 3 Created(GMT):Thu Aug 10 13:43:38 2023
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M aps & aerials
Small scale terrain

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100km •
60mi South
Carolina
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US Departm ait of Corn m ece
National Oceanic and Atm cspheric Adm histration
National Weather Service
National Water Center
1325 East West Highway
Silver Spring,M D20910
Q lestions?:HDSC.Q [e-mail]
Disclaim e-

Storm Drainage Design

Hydraflow Storm Sewers Extension for Autodesk® Civil 3D® Plan
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20 3 17
12
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Outfall 70 71
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Project File: New.stm Number of lines:74 Date:8/31/2023
Storm Sewers v2022 00

Storm Sewer Tabulation Page 1
Station Len Drng Area Rnoff Area x C Tc Rain Total Cap Vel Pipe Invert Elev HGL Elev Grnd/Rim Elev Line ID
coeff (I) flow full
Line To !nor Total Incr Total Inlet Syst Size Slope Dn Up Dn Up Dn Up
Line
(ft) (ac) (ac) (C) (min) (min) (in/hr) (cfs) (cfs) (ft/s) (in) (%) (ft) (ft) (ft) (ft) (ft) (ft)
1 End 44.552 0.00 14.00 0.00 0.00 8.40 0.0 12.5 5.7 47.67 50.77 8.16 36 0.49 573.50 573.72 575.81 576.03 576.92 579.63 101 -100
2 1 247.086 0.00 9.77 0.00 0.00 5.86 0.0 11.6 5.8 34.23 51.18 4.87 36 0.50 573.92 575.16 577.54 578.05 579.63 588.23 102-101
3 2 49.467 0.35 9.77 0.60 0.21 5.86 5.0 11.5 5.9 34.43 51.36 6.09 36 0.51 575.36 575.61 578.28 577.51 588.23 587.33 103-102
4 3 91.354 0.36 9.10 0.60 0.22 5.46 5.0 11.1 5.9 32.43 51.27 7.39 36 0.50 575.81 576.27 577.54 578.12 587.33 586.59 104-103
5 4 215.386 0.31 8.34 0.60 0.19 5.00 5.0 10.3 6.1 30.59 51.16 7.25 36 0.50 576.47 577.55 578.14 579.34 586.59 586.77 105-104
6 5 38.802 0.00 7.73 0.00 0.00 4.64 0.0 10.1 6.1 28.51 50.56 7.07 36 0.49 577.75 577.94 579.36 579.67 586.77 586.98 106-105
7 6 51.835 0.00 6.20 0.00 0.00 3.72 0.0 9.9 6.2 23.09 51.17 6.34 36 0.50 578.14 578.40 579.67 579.95 586.98 587.36 107-106
8 7 112.708 0.65 6.20 0.60 0.39 3.72 5.0 9.5 6.3 23.41 31.32 6.91 30 0.50 578.90 579.46 580.51 581.11 587.36 585.79 108-107
9 8 213.005 0.12 0.26 0.60 0.07 0.16 5.0 5.8 7.3 1.14 9.12 4.11 15 1.70 580.91 584.53 581.21 584.95 585.79 590.71 125-108
10 9 24.333 0.14 0.14 0.60 0.08 0.08 5.0 5.0 7.6 0.64 6.95 3.10 15 0.99 586.16 586.40 586.42 586.71 590.71 590.71 126-125
11 6 71.466 0.24 1.53 0.60 0.14 0.92 5.0 6.8 7.0 6.44 6.97 6.22 15 0.99 581.08 581.79 582.03 582.81 586.98 589.36 120-106
12 11 195.878 0.17 0.99 0.60 0.10 0.59 5.0 5.8 7.3 4.33 7.00 4.77 15 1.00 581.92 583.88 582.81 584.72 589.36 590.20 121 -120
13 12 24.333 0.26 0.26 0.60 0.16 0.16 5.0 5.0 7.6 1.18 7.50 3.82 15 1.15 585.62 585.90 585.96 586.33 590.20 590.20 127-121
14 8 25.330 0.64 5.29 0.60 0.38 3.17 5.0 9.1 6.4 20.27 31.83 6.66 30 0.51 579.66 579.79 581.11 581.32 585.79 585.79 109-108
15 14 38.254 0.44 4.65 0.60 0.26 2.79 5.0 8.9 6.4 17.93 31.31 6.38 30 0.50 579.99 580.18 581.35 581.61 585.79 586.81 110-109
16 15 235.544 0.66 4.21 0.60 0.40 2.53 5.0 7.8 6.7 16.95 31.45 6.28 30 0.50 580.38 581.56 581.69 582.95 586.81 586.76 111 -110
17 16 180.000 0.65 1.51 0.60 0.39 0.91 5.0 7.0 6.9 6.29 8.52 5.24 18 0.56 582.56 583.57 583.52 584.54 586.76 587.62 112-111
18 17 120.000 0.46 0.86 0.60 0.28 0.52 5.0 6.4 7.1 3.68 4.95 4.41 15 0.50 583.82 584.42 584.62 585.22 587.62 588.62 113-112
19 18 120.000 0.40 0.40 0.60 0.24 0.24 5.0 5.0 7.6 1.82 4.95 2.98 15 0.50 584.62 585.22 585.38 585.76 588.62 588.68 114-113
20 12 104.391 0.56 0.56 0.60 0.34 0.34 5.0 5.0 7.6 2.55 6.98 4.02 15 1.00 584.08 585.12 584.72 585.76 590.20 588.64 122-121
21 11 24.333 0.30 0.30 0.60 0.18 0.18 5.0 5.0 7.6 1.36 7.50 3.98 15 1.15 584.75 585.03 585.11 585.49 589.36 589.36 128-120
22 16 150.000 0.86 2.04 0.60 0.52 1.22 5.0 5.9 7.3 8.90 17.33 5.39 24 0.50 582.06 582.81 583.08 583.87 586.76 586.80 123-111
Project File: New.stm Number of lines:74 Run Date: 8/31/2023
NOTES:Intensity=73.40/(Inlet time+12.20)^0.80; Return period=Yrs. 10 ; c=cir e=ellip b=box
Storm Sewers v2022.00

Storm Sewer Tabulation Page 2
Station Len Drng Area Rnoff Area x C Tc Rain Total Cap Vel Pipe Invert Elev HGL Elev Grnd/Rim Elev Line ID
coeff (I) flow full
Line To !nor Total Inv* Total Inlet Syst Size Slope Dn Up Dn Up Dn Up
Line
(ft) (ac) (ac) (C) (min) (min) (in/hr) (cfs) (cfs) (ft/s) (in) (%) (ft) (ft) (ft) (ft) (ft) (ft)
23 22 166.302 1.18 1.18 0.60 0.71 0.71 5.0 5.0 7.6 5.36 7.94 4.82 18 0.49 583.33 584.14 584.23 585.04 586.80 587.88 124-123
24 3 24.333 0.32 0.32 0.60 0.19 0.19 5.0 5.0 7.6 1.45 7.50 4.06 15 1.15 582.76 583.04 583.13 583.52 587.33 587.31 131 -103
25 5 25.330 0.30 0.30 0.60 0.18 0.18 5.0 5.0 7.6 1.36 7.49 3.98 15 1.15 582.16 582.45 582.52 582.91 586.77 586.77 129-105
26 4 25.330 0.40 0.40 0.60 0.24 0.24 5.0 5.0 7.6 1.82 7.49 4.32 15 1.15 581.98 582.27 582.40 582.81 586.59 586.59 130-104
27 1 195.096 0.58 4.23 0.60 0.35 2.54 5.0 8.3 6.6 16.73 31.49 3.43 30 0.50 574.42 575.40 577.54 577.80 579.63 580.31 115-101
28 27 266.721 0.52 3.65 0.60 0.31 2.19 5.0 7.3 6.9 15.00 17.30 5.05 24 0.50 575.90 577.23 578.02 578.91 580.31 584.78 116-115
29 28 169.343 0.59 3.13 0.60 0.35 1.88 5.0 6.6 7.0 13.24 17.36 5.16 24 0.50 577.43 578.28 579.38 579.59 584.78 584.69 117-116
30 29 203.556 0.69 2.54 0.60 0.41 1.52 5.0 5.7 7.4 11.21 17.34 5.78 24 0.50 578.48 579.50 579.65 580.70 584.69 583.93 118-117
31 30 186.218 1.85 1.85 0.60 1.11 1.11 5.0 5.0 7.6 8.41 9.83 6.09 18 0.75 580.00 581.39 581.07 582.51 583.93 585.30 119-118
32 End 35.590 0.00 2.42 0.00 0.00 1.45 0.0 11.7 5.8 8.46 24.64 6.13 24 1.01 574.00 574.36 574.81 575.40 576.33 580.07 211 -200A
33 32 70.332 0.42 2.42 0.60 0.25 1.45 5.0 11.3 5.9 8.57 21.47 5.81 24 0.77 574.56 575.10 575.44 576.14 580.07 581.17 212-211
34 33 200.310 0.75 0.88 0.60 0.45 0.53 5.0 7.6 6.8 3.58 12.12 6.58 15 3.00 576.73 582.74 577.20 583.50 581.17 589.62 220-212
35 34 74.847 0.13 0.13 0.60 0.08 0.08 5.0 5.0 7.6 0.59 8.56 3.31 15 1.50 585.10 586.22 585.32 586.52 589.62 590.71 221 -220
36 33 109.791 0.20 1.12 0.60 0.12 0.67 5.0 10.8 6.0 4.03 4.95 4.50 15 0.50 575.85 576.40 576.71 577.26 581.17 581.17 213-212
37 36 145.210 0.26 0.92 0.60 0.16 0.55 5.0 10.1 6.2 3.40 4.93 3.84 15 0.50 576.60 577.32 577.60 578.07 581.17 580.97 214-213
38 37 126.114 0.49 0.66 0.60 0.29 0.40 5.0 9.2 6.4 2.52 9.24 3.34 15 1.74 577.52 579.72 578.42 580.36 580.97 583.50 215-214
39 38 157.904 0.17 0.17 0.60 0.10 0.10 5.0 5.0 7.6 0.77 9.88 2.42 15 1.99 579.92 583.07 580.36 583.41 583.50 586.66 216-215
40 End 68.188 0.29 4.26 0.60 0.17 2.54 5.0 12.7 5.6 14.33 22.01 6.87 24 0.81 574.00 574.55 575.18 575.91 576.33 587.62 132-100A
41 40 86.256 0.00 3.97 0.00 0.00 2.37 0.0 12.4 5.7 13.48 21.92 6.62 24 0.80 574.75 575.44 575.91 576.76 587.62 591.51 133-132
42 41 198.457 0.27 3.97 0.60 0.16 2.37 5.0 11.8 5.8 13.76 21.93 6.78 24 0.80 575.64 577.23 576.79 578.56 591.51 586.94 134-133
43 42 119.098 0.16 0.49 0.60 0.10 0.29 5.0 5.3 7.5 2.19 14.90 6.26 15 4.53 579.59 584.99 579.91 585.58 586.94 590.18 138-134
44 43 24.334 0.33 0.33 0.60 0.20 0.20 5.0 5.0 7.6 1.50 7.50 3.99 15 1.15 585.19 585.47 585.58 585.95 590.18 590.17 139-138
Project File: New.stm Number of lines:74 Run Date: 8/31/2023
NOTES:Intensity=73.40/(Inlet time+12.20)^0.80; Return period=Yrs. 10 ; c=cir e=ellip b=box
Storm Sewers v2022.00

Storm Sewer Tabulation Page 3
Station Len Drng Area Rnoff Area x C Tc Rain Total Cap Vel Pipe Invert Elev HGL Elev Grnd/Rim Elev Line ID
coeff (I) flow full
Line To !nor Total Incr Total Inlet Syst Size Slope Dn Up Dn Up Dn Up
Line
(ft) (ac) (ac) (C) (min) (min) (in/hr) (cfs) (cfs) (ft/s) (in) (%) (ft) (ft) (ft) (ft) (ft) (ft)
45 42 38.566 0.38 3.07 0.60 0.23 1.84 5.0 6.5 7.1 13.04 21.97 6.57 24 0.80 577.43 577.74 578.56 579.04 586.94 586.95 135-134
46 45 257.443 1.28 2.69 0.60 0.77 1.61 5.0 5.4 7.4 12.01 21.92 6.32 24 0.80 577.94 580.00 579.04 581.24 586.95 584.47 136-135
47 46 119.657 1.41 1.41 0.60 0.85 0.85 5.0 5.0 7.6 6.41 11.06 7.66 15 2.50 580.75 583.74 581.43 584.76 584.47 587.47 137-136
48 42 73.702 0.07 0.14 0.50 0.04 0.07 5.0 8.9 6.4 0.45 7.01 2.82 15 1.00 579.59 580.33 579.80 580.59 586.94 585.97 140-134
49 48 50.412 0.07 0.07 0.50 0.04 0.04 5.0 5.0 7.6 0.27 5.74 2.24 15 0.67 581.46 581.80 581.64 582.00 585.97 585.76 141 -140
50 End 110.551 0.10 7.26 0.60 0.06 4.36 5.0 8.5 6.5 28.47 50.96 7.09 36 0.50 574.00 574.55 575.60 576.28 576.88 582.70 201 -200
51 50 86.715 0.29 6.86 0.60 0.17 4.12 5.0 8.1 6.6 27.31 50.88 7.00 36 0.50 574.75 575.18 576.31 576.87 582.70 581.48 202-201
52 51 101.945 0.09 4.71 0.60 0.05 2.83 5.0 7.7 6.8 19.09 31.43 6.51 30 0.50 575.68 576.19 577.09 577.67 581.48 583.17 203-202
53 52 24.335 0.16 3.91 0.60 0.10 2.35 5.0 7.5 6.8 15.93 31.20 6.10 30 0.49 576.39 576.51 577.67 577.86 583.17 583.18 204-203
54 53 35.379 0.00 3.75 0.00 0.00 2.25 0.0 7.3 6.8 15.39 31.69 6.12 30 0.51 576.71 576.89 577.94 578.21 583.18 584.20 205-204
55 54 24.832 0.80 3.45 0.60 0.48 2.07 5.0 7.2 6.9 14.25 30.89 5.93 30 0.48 577.09 577.21 578.28 578.48 584.20 584.19 206-205
56 55 35.944 0.00 2.65 0.00 0.00 1.59 0.0 7.0 6.9 11.02 17.34 5.75 24 0.50 577.71 577.89 578.87 579.08 584.19 584.80 207-206
57 56 162.920 0.62 2.65 0.60 0.37 1.59 5.0 6.3 7.2 11.39 24.51 6.54 24 1.00 578.09 579.72 579.08 580.93 584.80 585.02 208-207
58 57 115.359 0.56 1.50 0.60 0.34 0.90 5.0 5.9 7.3 6.55 9.90 7.34 15 2.00 580.47 582.78 581.21 583.81 585.02 587.32 209-208
59 58 186.189 0.94 0.94 0.60 0.56 0.56 5.0 5.0 7.6 4.27 7.98 4.92 15 1.30 582.98 585.40 583.81 586.24 587.32 589.19 210-209
60 52 54.241 0.15 0.71 0.60 0.09 0.43 5.0 6.0 7.2 3.08 13.43 6.59 15 3.69 577.63 579.63 578.04 580.34 583.17 584.97 222-203
61 60 86.926 0.23 0.56 0.60 0.14 0.34 5.0 5.3 7.5 2.51 13.53 4.70 15 3.74 579.83 583.08 580.34 583.71 584.97 588.10 223-222
62 61 24.333 0.33 0.33 0.60 0.20 0.20 5.0 5.0 7.6 1.50 7.50 4.09 15 1.15 583.87 584.15 584.25 584.63 588.10 588.10 224-223
63 57 110.019 0.53 0.53 0.60 0.32 0.32 5.0 5.0 7.6 2.41 8.57 4.92 15 1.50 580.47 582.12 580.93 582.74 585.02 585.82 227-208
64 54 101.702 0.08 0.30 0.60 0.05 0.18 5.0 5.5 7.4 1.33 11.89 4.85 15 2.89 578.34 581.28 578.62 581.74 584.20 585.81 225-205
65 64 24.333 0.22 0.22 0.60 0.13 0.13 5.0 5.0 7.6 1.00 6.95 3.53 15 0.99 581.48 581.72 581.80 582.11 585.81 585.81 226-225
66 51 25.330 0.46 1.86 0.60 0.28 1.12 5.0 7.5 6.8 7.58 8.15 5.24 18 0.51 576.67 576.80 577.82 577.94 581.48 581.48 217-202
Project File: New.stm Number of lines:74 Run Date: 8/31/2023
NOTES:Intensity=73.40/(Inlet time+12.20)^0.80; Return period=Yrs. 10 ; c=cir e=ellip b=box
Storm Sewers v2022.00

Storm Sewer Tabulation Page 4
Station Len Drng Area Rnoff Area x C Tc Rain Total Cap Vel Pipe Invert Elev HGL Elev Grnd/Rim Elev Line ID
coeff (I) flow full
Line To !nor Total Incr Total Inlet Syst Size Slope Dn Up Dn Up Dn Up
Line
(ft) (ac) (ac) (C) (min) (min) (in/hr) (cfs) (cfs) (ft/s) (in) (%) (ft) (ft) (ft) (ft) (ft) (ft)
67 66 265.379 0.85 1.40 0.60 0.51 0.84 5.0 6.2 7.2 6.02 8.05 4.62 18 0.50 577.00 578.33 578.16 579.28 581.48 581.97 218-217
68 67 150.191 0.55 0.55 0.60 0.33 0.33 5.0 5.0 7.6 2.50 4.94 3.78 15 0.50 578.58 579.33 579.28 579.96 581.97 582.48 219-218
69 50 24.333 0.30 0.30 0.60 0.18 0.18 5.0 5.0 7.6 1.36 7.50 3.98 15 1.15 578.13 578.41 578.49 578.87 582.70 582.72 228-201
70 End 46.506 0.00 7.81 0.00 0.00 4.69 0.0 16.2 5.1 23.77 38.54 7.57 30 0.75 580.96 581.31 582.38 582.97 583.84 586.33 900-901
71 70 88.272 0.03 7.81 0.60 0.02 4.69 5.0 15.9 5.1 23.97 31.37 6.97 30 0.50 581.51 581.95 583.15 583.62 586.33 587.86 901 -902
72 71 49.519 0.04 7.78 0.60 0.02 4.67 5.0 15.7 5.1 24.00 31.57 6.99 30 0.50 582.15 582.40 583.78 584.07 587.86 588.13 902-903
73 72 167.697 0.36 7.74 0.60 0.22 4.64 5.0 15.2 5.2 24.27 31.45 7.00 30 0.50 582.60 583.44 584.25 585.12 588.13 588.41 903-904
74 73 51.476 7.38 7.38 0.60 4.43 4.43 15.0 15.0 5.3 23.26 31.58 6.92 30 0.51 583.64 583.90 585.24 585.54 588.41 588.70 904-905
Project File: New.stm Number of lines:74 Run Date: 8/31/2023
NOTES:Intensity=73.40/(Inlet time+12.20)^0.80; Return period=Yrs. 10 ; c=cir e=ellip b=box
Storm Sewers v2022.00

Spread Cover

10-YR STORM: SPREAD CALCULATIONS / INLET CAPACITY CHART
PROJECT:Aurora at Price Mill Creek DESIGNED BY: SAH DATE: 8/31/2023
LOCATION:Wesley Chapel, NC CHECKED BY: JWF DATE: 8/31/2023
RAINFALL INTENSITY 4.0 IN/HR REFERENCE: "FHWA HEC-21 &HEC-22" Max Allowable Spread= 7.50
ROAD 3
INLET# DRAINAGE INLET'C' INLET TYPE SURFACE 'Q' SLOPE INLET BYPASS To Inlet#
AREA SUB. TOTAL LONG. TRANS. K Q CAP SPREAD DEPTH Q REMARKS
DCB-220 0.75 0.60 SAG-DOUBLE 1.80 1.80 0.000 0.03125 0.0 N/A 4.63 0.14 0.00
CB-221 0.13 0.60 ON GRADE 0.31 0.31 0.010 0.03125 19.0 0.48 3.52 0.11 0.00 DCB-220
CB-224 0.33 0.60 ON GRADE 0.79 0.79 0.045 0.03125 29.1 0.82 3.76 0.12 0.00 DCB-206
DCB-206 0.80 0.60 SAG-DOUBLE 1.92 1.92 0.000 0.03125 0.0 N/A 4.83 0.15 0.00
CB-226 0.22 0.60 ON GRADE 0.53 0.53 0.032 0.03125 26.2 0.64 3.45 0.11 0.00 DCB-206
CB-903 0.04 0.60 ON GRADE 0.10 0.10 0.017 0.03125 22.2 0.23 2.04 0.06 0.00
SWITCH SIDE I
CB-902 0.03 0.60 ON GRADE 0.07 0.07 0.017 0.0313 22.2 0.19 1.83 0.06 0.00
CB-225 0.08 0.60 ON GRADE 0.19 0.19 0.032 0.03125 26.2 0.34 2.36 0.07 0.00 CB-204
CB-222 0.15 0.60 ON GRADE 0.36 0.36 0.022 0.03125 23.9 0.52 3.21 0.10 0.00 CB-225
CB-223 0.23 0.60 ON GRADE 0.55 0.55 0.045 0.03125 29.1 0.65 3.29 0.10 0.00 CB-222
DCB-220 0.75 0.60 SAG-DOUBLE 1.80 1.80 0.022 0.03125 23.9 N/A 4.63 0.14 0.00
ROAD 4
INLET# DRAINAGE BYPASS
INLET'C' INLET TYPE SURFACE 'Q' SLOPE INLET To Inlet#
AREA •SUB. TOTAL LONG. TRANS. K Q CAP SPREAD DEPTH Q REMARKS
CB-228 0.30 0.60 ON GRADE 0.72 0.72 0.027 0.03125 25.1 0.79 4.00 0.12 0.00 DCB-217
DCB-217 0.46 0.60 SAG-DOUBLE 1.10 1.10 0.000 0.03125 0.0 N/A 3.34 0.10 0.00
CB-204 0.16 0.60 ON GRADE 0.38 0.38 0.026 0.03125 24.8 0.53 3.19 0.10 0.00 DCB-217
SWITCH SIDE I
CB-203 0.09 0.60 ON GRADE 0.22 0.22 0.026 0.0313 24.8 0.37 2.57 0.08 0.00 DCB-202
DCB-202 0.29 0.60 SAG-DOUBLE 0.70 0.70 0.000 0.03125 0.0 N/A 2.46 0.08 0.00
CB-201 0.10 0.60 ON GRADE 0.24 0.24 0.027 0.03125 25.1 0.40 2.65 0.08 0.00 DCB-202

ROAD 1
INLET# DRAINAGE BYPASS
INLET'C' INLET TYPE SURFACE 'Q' SLOPE INLET To Inlet#
•
AREA SUB. TOTAL LONG. TRANS. K Q CAP SPREAD DEPTH Q REMARKS
DCB-122 0.56 0.60 SAG-DOUBLE 1.34 1.34 0.000 0.03125 0.0 N/A 3.81 0.12 0.00
CB-127 0.26 0.60 ON GRADE 0.62 0.62 0.013 0.03125 20.0 0.73 4.38 0.14 0.00 CB-128
CB-128 0.30 0.60 ON GRADE 0.72 0.72 0.019 0.03125 23.2 0.80 4.26 0.13 0.00 DCB-109
DCB-109 1.08 0.60 SAG-DOUBLE 2.59 2.59 0.000 0.03125 0.0 N/A 5.90 0.18 0.00
CB-126 0.14 0.60 ON GRADE 0.34 0.34 0.030 0.03125 26.0 0.49 2.95 0.09 0.00 DCB-109
CB-139 0.33 0.60 ON GRADE 0.79 0.79 0.023 0.03125 24.1 0.84 4.27 0.13 0.00 CB-135
CB-135 0.38 0.60 ON GRADE 0.91 0.91 0.019 0.03125 23.0 0.93 4.68 0.15 0.00 DCB-141
DCB-141 0.07 0.60 SAG-DOUBLE 0.17 0.17 0.000 0.03125 0.0 N/A 0.95 0.03 0.00
SWITCH SIDE I
DCB-140 0.07 0.60 SAG-DOUBLE 0.17 0.17 0.000 0.03125 0.0 N/A 0.95 0.03 0.00
CB-134 0.27 0.60 ON GRADE 0.65 0.65 0.019 0.03125 23.0 0.75 4.11 0.13 0.00 DCB-140
CB-138 0.16 0.60 ON GRADE 0.38 0.38 0.023 0.03125 24.1 0.54 3.26 0.10 0.00 CB-134
CB-125 0.12 0.60 ON GRADE 0.29 0.29 0.030 0.03125 26.0 0.44 2.78 0.09 0.00 DCB-108
DCB-108 0.65 0.60 SAG-DOUBLE 1.56 1.56 0.000 0.03125 0.0 N/A 4.21 0.13 0.00
CB-107 0.01 0.60 ON GRADE 0.02 0.02 0.019 0.03125 22.9 0.10 1.20 0.04 0.00 DCB-108
CB-120 0.24 0.60 ON GRADE 0.58 0.58 0.019 0.03125 23.2 0.70 3.92 0.12 0.00 DCB-129
CB-121 0.17 0.60 ON GRADE 0.41 0.41 0.013 0.03125 20.0 0.56 3.73 0.12 0.00 DCB-122
DCB-122 0.56 0.60 SAG-DOUBLE 1.34 1.34 0.019 0.03125 22.9 N/A 3.81 0.12 0.00
ROAD 2
INLET# DRAINAGE INLET'C' INLET TYPE SURFACE 'Q' SLOPE INLET BYPASS To Inlet#
AREA SUB. I TOTAL LONG. TRANS. K Q CAP SPREAD DEPTH Q REMARKS
CB-131 0.32 0.60 ON GRADE 0.77 0.77 0.008 0.03125 14.3 0.69 5.21 0.16 0.08 DCB-130
DCB-130 0.40 0.60 SAG-DOUBLE 0.96 1.04 0.000 0.03125 0.0 N/A 3.20 0.10 0.00
DCB-129 0.30 0.60 SAG-DOUBLE 0.72 0.72 0.000 0.03125 0.0 N/A 2.51 0.08 0.00
SWITCH SIDE I
CB-106 0.04 0.60 ON GRADE 0.08 0.08 0.011 0.0313 19.5 0.21 2.11 0.07 0.00 DCB-105
DCB-105 0.31 0.60 SAG-DOUBLE 0.74 0.74 0.000 0.03125 0.0 N/A 2.57 0.08 0.00
DCB-104 0.36 0.60 SAG-DOUBLE 0.86 0.97 0.027 0.03125 25.1 N/A 3.07 0.10 0.00
CB-103 0.35 0.60 ON GRADE 0.84 0.84 0.008 0.03125 14.3 0.73 5.39 0.17 0.11 DCB-104

Culverts

Culvert Report
Hydraflow Express Extension for Autodesk®Civil 3D®by Autodesk, Inc. Thursday,Aug 31 2023
909 to 908
Invert Elev Dn (ft) = 581.93 Calculations
Pipe Length (ft) = 95.01 Qmin (cfs) = 8.96
Slope (%) = 0.60 Qmax (cfs) = 8.96
Invert Elev Up (ft) = 582.50 Tailwater Elev (ft) = (dc+D)/2
Rise (in) = 24.0
Shape = Circular Highlighted
Span (in) = 24.0 Qtotal (cfs) = 8.96
No. Barrels = 1 Qpipe (cfs) = 8.96
n-Value = 0.012 Qovertop (cfs) = 0.00
Culvert Type = Circular Concrete Veloc Dn (ft/s) = 3.47
Culvert Entrance = Square edge w/headwall (C) Veloc Up (ft/s) = 5.25
Coeff. K,M,c,Y,k = 0.0098, 2, 0.0398, 0.67, 0.5 HGL Dn (ft) = 583.46
HGL Up (ft) = 583.57
Embankment Hw Elev (ft) = 584.07
Top Elevation (ft) = 586.50 Hw/D (ft) = 0.79
Top Width (ft) = 60.00 Flow Regime = Inlet Control
Crest Width (ft) = 10.00
Elev(ftj 909 to 908 Hw Depth(ft)
:::
. 4.50
3.50
585.00 2.50
584.00 1.50
583.00 0.50
582.OD - .0.50
581.00 - . -1.50
580.00 -2.50
0 10 20 30 40 50 60 7D 80 9D 1D2 110 120 130 140
Circular Culvert HGL Embank
Reach(ft)

Hydrology Report
Hydraflow Express Extension for Autodesk®Civil 3D®by Autodesk, Inc. Thursday,Aug 31 2023
909 to 908
Hydrograph type = Rational Peak discharge (cfs) = 8.957
Storm frequency (yrs) = 25 Time interval (min) = 1
Drainage area (ac) = 2.140 Runoff coeff. (C) = 0.5
Rainfall Inten (in/hr) = 8.371 Tc by User (min) = 5
IDF Curve = Aurora IDF.IDF Rec limb factor = 1.00
Hydrograph Volume=2,687(cuff);0.062(acft)
Runoff Hydrograph
Q (cfs) 25-yr frequency Q (cfs)
10.00 - 10.00
8.00 8.00
6.00 6.00
4.00 4.00
2.00 2.00
0.00 0.00
0 5 10
Time (min)
Runoff Hyd -Qp = 8.96 (cfs)

Culvert Report
Hydraflow Express Extension for Autodesk®Civil 3D®by Autodesk, Inc. Thursday,Aug 31 2023
907 to 906
Invert Elev Dn (ft) = 581.47 Calculations
Pipe Length (ft) = 92.18 Qmin (cfs) = 14.86
Slope (%) = 1.39 Qmax (cfs) = 14.86
Invert Elev Up (ft) = 582.75 Tailwater Elev (ft) = (dc+D)/2
Rise (in) = 24.0
Shape = Circular Highlighted
Span (in) = 24.0 Qtotal (cfs) = 14.86
No. Barrels = 1 Qpipe (cfs) = 14.86
n-Value = 0.012 Qovertop (cfs) = 0.00
Culvert Type = Circular Concrete Veloc Dn (ft/s) = 5.24
Culvert Entrance = Square edge w/headwall (C) Veloc Up (ft/s) = 6.39
Coeff. K,M,c,Y,k = 0.0098, 2, 0.0398, 0.67, 0.5 HGL Dn (ft) = 583.16
HGL Up (ft) = 584.14
Embankment Hw Elev (ft) = 584.98
Top Elevation (ft) = 586.90 Hw/D (ft) = 1.11
Top Width (ft) = 40.00 Flow Regime = Inlet Control
Crest Width (ft) = 10.00
Elev(ftj 907 to 906 Hw Depth(0)
687.00 4.25
586.00 3.25
-------7' .-------.---------
585.00 2.25
584.00 - 1.25
583.00 0.25
582.00 --0.75
1
581.00 - -1.75
580.00 - - -2.75
0 10 20 30 40 50 60 7D 80 9D 1DL, 110 120 130 140
Circular Culvert HGL Embank
Reach(10

Hydrology Report
Hydraflow Express Extension for Autodesk®Civil 3D®by Autodesk, Inc. Thursday,Aug 31 2023
907 to 906
Hydrograph type = Rational Peak discharge (cfs) = 14.86
Storm frequency (yrs) = 25 Time interval (min) = 1
Drainage area (ac) = 3.550 Runoff coeff. (C) = 0.5
Rainfall Inten (in/hr) = 8.371 Tc by User (min) = 5
IDF Curve = Aurora IDF.IDF Rec limb factor = 1.00
Hydrograph Volume=4,457(cuft);0.102(acft)
Runoff Hydrograph
Q (cfs) 25-yr frequency Q (cfs)
15.00 15.00
12.00 12.00
9.00 9.00
6.00 6.00
3.00 3.00
0.00 0.00
0 5 10
Time (min)
Runoff Hyd -Qp = 14.86 (cfs)