SW4210703_Design Calculations_20210914

JAMESTOWN ENGINEERING GROUP, INC.
117 EAST MAIN STREET
G ina.
JAMESTOWN, NC 27282
PROJECT: _ -�-/ 44 (-c-7 f''o I-- —t C
COMPUTED BY: CHECKED BY:
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SHEET NO. I
DATE: Lu,
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PROJECT NO. Z
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Precipitation Frequency Data Server
https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_pri ntpage.html? 1 at=35.962...
NOAA At1a614, Volurne 2, Version 3
Location nano: Lexington. North Carolina, USX
Latitude: 35.9629', Longitude: .80.2677•
�aw
Elevation: 764.46 ft
MON.
y 'lance ESRi Mrpa
^ aoerca usW
POINT PRECIPITATION FREQUENCY ESTIMATES
G M Ba Mir D MarM, B Lin, T P=Vbok M Vekla. ant D Riley
NDAA Nat"We~ Servce, SA.m Spree, W-furr i
PE_t i I PE nraphcal I Mays 8 aerials
PF tabular
PDS-based point precipitation frequency estimates with 90%confidence intervals (in inches),
Duration Average recurrence Interval (years)
r 1
r 2
r -6F
10
F -2S
1 50-
100
1 200 1 500
1000
0.781
Fr--, min
(0.351.0.415)
0.453
(049.0.494}
�I
(I�O.S2�8
0.578
0.532.0.628
0.834
0.669
If. 0.700�
0.725 0.750
���
0.765
0.609
o.725
(0.486.0.575 )
0.848
( )��1(
o.928
05B0.0687)
1.01
(0.808072
1 1.07
O.fi33.0.760)
1.11
(0.652-0.798j (0.667.0.817)
1.15 1.19
(0.875.0.836)
1.20
10-m)n
(D.561.0.662)
(0.688-0.769)
(0.T79.0.921)
10.850-i 00)
(0.924.1.10)
(0.969.1.16)
(1.00.1.21)
( 1.03.1.25) 1(1.06-1.28)1
(1.08.1.32)
0.762
0.812
1.07
1.17
1.28
1.35
1.41
1.45 1.49
1.51
1S-r17in
(0.701-0.828)
(0.840.0.9M)
(0.9851.17)
1 (108.1.27)
1 (1.17-1.39)
1 (123.147)
1 (1.27463)
1 (1.30-1.58) 1 (1.33463)
1 (1.33.1.65)
1.14
F 1.26
r 1.12
F 1.70
F 1.90
F 2.01
F 213
F 126 F 2.38
f 2.45
30-min
(0.981.1.14)
(1.16.1.37)
1 (1,40-1.68)
1 (1.66.1,84)
1 (1.73-208)
1 (1.85.2.21)
1 (1.95.234)
1 (203.246) 1 (2.11-2.59)
1 (216.2.68)
1.30
(1-20.1.42)
1.68
(1.46.1.72)
1.95 2.21
1 (1.80.212) 1 (203.2.40)
2.53
(231.274)
2.75 "I3.17
I 1
3.41
3.11
2-hr
1.81
(1.40.1.64)
1.11
(1.89.1.90)
2.28 2.61
1.03
(251.299) (2.68-322) (295.344)
3.34 1. 3.91
I (303.1M
.3
1 (315.191)
4.57
(2.11.247) (240.2.62)
(2.77.3.27)
(304.3.61) (129.394) (3.52.4.�
.8
(3.8 7)
(4o0-4.97)
3-hr
1.61
1.11
2.4d 2.80
3.26
3.11 3.14 4.27
4.10
5.01
(1.48.1.75)
(1.81.2.13)
(2.25.2.65) (258-3 02)
(2 98.3 52)
(3 28.3.89) (3.56.4.26) i (3.82.4.62)
(4.15.5.00)
(4.37-5.44)
6-hr
1.96 2.37-
2.96 3.40
i(33.99
4.45
4.81 5.18 5.98
8.44
(1.81-2.13) (2.19-258)
(2.73.3.22) (313.3.60)
.64.432) .
(4.03.4.81)
(4.41.530) (4.76.5.80) (5.22.6.47)
i
(5.58.6.98)
12 hf
2.31
F 2.60
F 3.50 4.08 F 4.81 5.40
F 6.01 F 6.64 7.49
8.16
(2.13.253)
(2.58-305)
(3.22.3.82) (3.72-4.41) (436.5,21) (4.86.5.84)
I (5.36.649) (5.55-7.16} (6,49-8.08)
(6.96-8.80)
24-hr
724 h,2
80
(2.60.302) 1
3.18
(114464)
4.22 4.88 5.78
(3.91.4.55) j (452.5.27) 1 (533.6.24)
6.50
1 (5.97.7.01)
7.23 � 9.01
1 (8.63.781) I (7.28-8.63) 1 (8.17-9.76)
9.82
(8.87.10.7)
.
324
(102-3.48) 1
380
(3 63-4 19)
83 5.55 6.51-T.
1 (4 60419) 1 (5 16.5.95) j (6 03.6 98)
27
1 (6 71.7 80)
02.dy
1 (7.39.8 63)
I-
(8 0&9.49) (8.99.10.
10.7
(9.7611.6)
,-day
3.44
(3.21.168)
4.13
(3.66.4.43)
5.08 8.85 6.86
(4.76-5.46) (5-45-6.26) (6.37-7.35)
7.65
( (7.08.6,22)
a.46
17.81-9.10)
9.29 10,4
(8.53.10.0) (9.51-11.2)
11.3
(10.3.12.2)
F-1-11-F
4.31
F5.36 6.14 F 7.11
804
8.80
9.77 11.0
11.9
4.41ay
(3.40.3.89)
(4.08.4.
( 5.01.574) (5.74.6. (670.7.72)
(7.46.8.63)
(8.22-957)
(8.9910.5) (100.118)
(10.8.129)
7day
13
(3.814.44)
(4.66SS36)
(5,85.6.43) (6. 27B32) (7,46.854)
(8.27.9.51)
(8.17} 0.5)
I {9.92 1.Sj I (11.0 2.9)
(119 4.0)
10dey
(4.48.5.02)
(5.30.5.97)
(6,367716) I (7.1981D)
1 (8.29.9.37)
1 (9. 410.4)
1 (9.99 1.4)
1 (10.8. 2.5)
1 (12.0- 3.9)
(12.9 50)
20-day
6.36
7.so
e.87
9.08
11.4
12.6
13.8
15.0
16.6
1 17.8
(602.672)
1 (7.11.713)
1 (840.937)
1 (942.10S)
1 (11D.8121)
1 (11.8.13.3)
1 (12.9.14.6)
1 (14.0-15.9)
(15.4.17.7)
1 (16.4.19.1)
30 day
(7.52.8.25)
(813.9.70)
(10.2-111.3)
111.3- 2.5)
(12.7.14.1)
(13.8. 5.3)
1 (14.916.5)
(15.9-17.8)
(17'2- 9.4)
(1812.20.T)
9.90
11.6
13.3
14.8
16.3
17.5
18.5
20,0
21.7
22.9
4S-day
(9.49.10.4)
(1.1.12.1 )
(12.7.13.9)
(13.9.15.2)
(155-1T0)
(167.183)
(178.19.7)
(16.9.21.0)
(204•22.6)
( 216.24.
11.8
13.8
15.8
1T.0
1e.7
20.0
21.3
22.5
24.0
25.1
60-day
(11.412.4)
(13.3.14.4)
(1&0.16.2)
(161-177)
(17.9-19.5)
(19.1•2D.9)
(203.222)
(21.4.23.5}
(228-25.2)
1 (23.8.264)
t Precipitation trequency (PF) eslintales In this table are based on frequency analysis of partial duration sales (PDS).
Numbers in parenthesis are PF estimates at lowand upper bounds of the 90% confidence Interval. The probalsirty that precipitation frequency essmates (for
a ghat duration and aNerage recurrence baervap etl be greater than the upper bound (or less than the lower bound) is 5%. Estimates a1 upper bounds are not
chocked against probable nozmwn precipitation (Pk" estimates and trey be higher than currently valid PMP w4res.
1`I0e1e rater to NOAA Nee 14 dodument for mote information.
B--k to Top
PF graphical
1 of3 8/25/2021 5:23 I':b1

Precipitation Frequency Data Server
https://hdsc.nws.noaa.gov/hdse/pfds/pfds
PDS-based depth -duration -frequency {DD€) curves
Latitude. 35.9629`. Longitude -80 26771
30
25
5
0
E E E E EE rL a1 rLy Q Zrbs tiro ro m m ,v�{{ vp°
N �1 Q ry 0 N Af � s�
Curatron
30
25
5
0
1
Average recurrence interval (years)
0
NOAA Atlas 14, volume 2. Version 3 Created IGMT} Wed Auq 25 21 2132 2021
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— 65-day
— 12-hr
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Precipitation Frequency Data Server
https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.htinl?lat =35.962...
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