SW3241004_Design Calculations_20241118

CEST
Stormwater Calculations
For
Central Cowboy Church
11777 US-601
Cabarrus County
Midland, NC 28107
CESI PROJECT NO. 240539.000
Date: 10/025/2024
��,•O .\N C A Ro %'
14 OESSIo�y,9'�%
Owner: - Q
Central Station Cowboy Church INC. _ SEAL
11777 US-601 054. .2
Midland, NC 28107 %�� FV�/NE. i
10/25/2024
Preparer's Name:
Nancy Elizabeth Warlick, PE
CESI
NCBEL Firm License C-0263
642D Signal Hill Drive Extension
M.704.648.2684
lizwarlick(a,cesicgs.com

240539.000 Central Cowboy Church I Town of Midland
11777 US-601, Midland,NC 28107
Storm Water Calculations
1. Narrative (3)
2. Culvert Drainage (5)
a. Culvert Drainage Conditions
b. Impervious Calculations
3. Site Development and Erosion Control Sequence (9)
4. Stormwater Calculation (12)
a. Rip-Rap Sizing
b. NCDEQ Rip-Rap Apron Sizing
c. Time of Concentration
d. Culvert Hydrographs
e. Culvert Express Calculations
5. Supporting Information (37)
a. USGS Map
b. NRCS Web Soil Survey Hydro-Soil Map
c. NRCS Web Soil Survey Soil Map
d. Rainfall Data [Intensity and Depth]
e. NCDEQ Table 4: HSGS for NC Soil Types
2

240539.000 Central Cowboy Church I Town of Midland
11777 US-601, Midland,NC 28107
Narrative
3

240539.000 Central Cowboy Church I Town of Midland
11777 US-601, Midland,NC 28107
Existing Conditions
The project site is located at 11777 US-601,Midland,NC 28107. The purpose of the project is to
prepare a gravel parking lot, gravel drive, two new culverts, and a riding arena for the Central
Cowboy Church. The site receives approximately 206.20 AC of runoff from the local area based
on Cabarrus County GIS 2FT contours and existing culverts. Of the 206.20 AC, 91.96 AC is
impervious based on aerial images and proposed gravel parking and drive.
Special Design Criteria
- Aerial images are used to determine the impervious breakdown
- The culvert drainage area consists of Type C and Type D soil, Type D is assumed as the
most restrictive. Fair conditions are also assumed for open areas/grassed.
- Drainage area is based on Cabarrus County LiDAR and existing culverts noted by Town
of Midland
- For the Culvert design, the design storm used for the minimum is the 1-year and the
maximum being the 10-year storm. The Town of Midland allows the 10-year storm to be
used due to massive drainage area from offsite flowing towards the site.
4

240539.000 Central Cowboy Church I Town of Midland
11777 US-601, Midland,NC 28107
Culvert Drainage
5

240539.000 Central Cowboy Church l Town of Midland
11777 US-601, Midland, NC 28107
Culvert Drainage Conditions
'� =�.fa.. 'ram
/° ,ter
w/ ;
1
/jam % ,:.7 "7:::- 4
f
7, - (,) V 5-c,', ) r"."4\0//
Note: See DA-CULV, DA4-CULV, &DA5-CULVfor original.
6

240539.000 Central Cowboy Church I Town of Midland
11777 US-601, Midland,NC 28107
Culvert Drainage Areas Table
AREA WOODS OPEN/ IMP COMP
DRAINAGE AREA# % IMP
[AC] [AC] GRASS [AC] [AC] CC
1 16.69 1.19 8.26 7.24 43.4% 0.52
2 21.37 13.83 5.23 2.31 10.8% 0.25
3 (CULVERT C) 1.81 0.00 1.53 0.29 15.8% 0.32
4 (OFFSITE WEST) 138.13 65.51 _ 49.86 22.77 16.5% 0.30
5 (OFFSITE SOUTH) 28.20 11.44 12.46 4.30 15.3% 0.29
TOTAL 206.20 91.96 77.34 36.91 17.9% -
DRAINAGE AREA AREA WOODS OPEN/ IMP % IMP
SUMMARY [AC] [AC] GRASS [AC] [AC]
CULVERT WEST (DA1 154.82 66.69 58.12 30.01 19.4%
+DA4)
CULVERT EAST (DA2 49.57 25.27 17.69 6.61 13.3%
+DA5)
7

240539.000 Central Cowboy Church I Town of Midland
11777 US-601, Midland,NC 28107
Impervious Calculations
EXISTING IMPERVIOUS 40,752 SF, 0.94 AC
PROPOSED IMPERVIOUS 61,710 SF, 1.42 AC
BUILDINGS 0 SF, 0.00 AC
PAVING 0 SF, 0.00 AC
GRAVEL 61,710 SF, 1.42 AC
% PROPOSED IMPERVIOUS 13.5%
POST CONSTRUCTION % IMP 22.5%
Note:Existing impervious are based on aerial images.
8

240539.000 Central Cowboy Church I Town of Midland
11777 US-601, Midland,NC 28107
Site Development and Erosion Control Sequence
9

240539.000 Central Cowboy Church I Town of Midland
11777 US-601, Midland,NC 28107
240539.000 Construction Sequence
- Acquire all required permits: Town of Midland review and NCDEQ Erosion Control Permit
- Hold a pre-construction conference on site with applicable authorities and involved
stakeholders.Determine Inspection and coordination required to meet project requirements
and responsible parties
o Owner
o Contractor
o Engineer of Record
Overall Erosion Control
- Locate and install construction entrance
- Stake limits of disturbance for the site.
- Stake and install silt fence as shown on C400
Install perimeter dikes and wattles to prevent offsite runoff from entering the site.
- Install Culvert West and East and prepare rip-rap aprons based on detail on C420.
Seed and mat slopes of Culvert West and Culvert East immediately
- Install Rock Ring at Culvert invert ins (South side)
Use recommended vehicle path
- Begin Skimmer Basin 1 installation; stockpile sediment at Temp. Sediment Stockpile,
ensure the toe of stockpile is not within 50' of the top of skimmer basin or temporary
diversions and perimeter dikes as delineated on C400.
Prepare Skimmer Basin emergency weir and ensure silt fences do not collect Skimmer
basin discharge from skimmer and weir.
- Begin grading as shown on C400, Clear woods at corner of riding arena as needed.
- Install temporary pipe to collect runoff from roadside 3:1 cut slope
Install gravel drive only on recommended vehicle path
- Install temporary diversion ditch to guide runoff into skimmer basin,use slope drains
to minimize erosion to SSB and install riprap as per Slope drain detail to protect
bottom of skimmer.
- Once the site is substantially stabilized, call for an NCDEQ EC inspection before
decommissioning of SSB-1
- Upon approval from NCDEQ EC site inspector, Remove SSB-1 skimmer unit, other
internal components, and remove emergency weir and close the silt fence north of the
skimmer and with the silt fence south of the emergency weir.
Begin decommissioning of SSB-1 using soil from Temp. Sediment stockpile
- Grade skimmer area to match C300 and connect gravel drive where emergency weir
used to be.
- Install Culvert C as shown on C300 and see and mat slopes immediately; install riprap
apron for Culvert C and extend rip rap to toe of fill slope as shown on C300
Adjust silt fence and rock weirs to not collect discharge from Culvert C
- Replace any gravel that is deteriorated from erosion control within the recommended
path and install gravel to connect the recommended path where the emergency weir
used to be.
- Complete final seeding, landscaping, and site cleanup.
Important Note: Additional erosion control measures may be required if approved measures
are not adequate.
10

240539.000 Central Cowboy Church I Town of Midland
11777 US-601, Midland,NC 28107
- Once the site is substantially stabilized, call for an inspection before removal of
temporary measures.
- Upon approval from site inspector, begin decommissioning of temporary erosion
control measures:
- Remove sediment from Rock Ring or remove sediment and rock rings and extend rip
rap apron for Culvert A and Culvert B to match C300.
- Remove silt fence, rock weirs, temporary diversions, perimeter dikes, and wattles
along site boundary. Final seed remaining disturbed areas.
- Remove silt fence and rock weirs along stream buffer and any other temporary erosion
Control items. Final seed remaining disturbed areas.
- Final cleanup of remaining site.
- Call for final closeout inspection.
11

240539.000 Central Cowboy Church I Town of Midland
11777 US-601, Midland,NC 28107
Stormwater Calculation
12

240539.000 Central Cowboy Church I Town of Midland
11777 US-601, Midland,NC 28107
Rip-Rap Sizing
Pipe Dia La Thickness
Location Qio(cfs) ' do (in) (ft) W(ft) dso (in) D (in) (in)
CULV A (Culvert West) 293.57 48 52.0 56.0 23 34.5 51.75
CULV B (Culvert East) 197.96 48 41.0 45.0 17 25.5 38.25
CULV C 4.25 12 7.0 8.0 5 7.5 11.25
13

CULVERT WEST I CULVERT A Appendices
311= 3*(4.0') = 12.0'
3 o It I C'
Outlet W = Do + La = 4.0' + 52.0' = 56.0' 90.� ' ' 'iihi■I li it I -I:
i 11 ;IA II I
pipe I L !11111iu11 t •"�
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3 5 10 20 50 A no 200 A 500 1000
Q 1 = 124.44 CFS Disci uarge(ft3/ C.,) D50=2.10'OR
25.2"—>23"NCDOT requires
Q 10 = 293.57 CFS — 17"as max,however for NCDEQ
Erosion Control,23"shall be
Curves may not be extrapolated. used as the most restrictive.
Figure 8.06a Design of outlet protection protection from a round pipe flowing full,minimum tailwater condition(Tw<0.5 diameter).
Rev.12/93 8.06.3

CULVERT EAST I CULVERT B Appendices
3D0= 3*(4.0') = 12.0'
3o it I ,,
Outlet W = Do + La = 4.0' + 41.0' = 45.0' 90.,_ ; ' 'rioinl 1{ 1 �•
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3 5 10 20 50 100 60 500 1000
Q1 = 81.35 CFS Disci large(ft3/ C ) D50= 1.40'OR
Q10 = 197.96 CFS 16.8°=17"
Curves may not be extrapolated.
Figure 8.06a Design of outlet protection protection from a round pipe flowing full,minimum tailwater condition(Tw<0.5 diameter).
Rev.12/93 8.06.3

C U LV E RT C Appendices
3D0= 3*(1.0') = 3.0'
3 o it i ,,
.1I;I
Outlet W = Do + La = 1.0' + 7.0' = 8.0' n
9., il mu u i q
'mow
I minim111 " i
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3 5 10 20 50 100 200 500 1000
Discharge(ft3/sec) D50 = 0.25' OR
Q10 = 4.26 CFS 3" = 5" NCDOT
MIN.
Curves may not be extrapolated.
Figure 8.06a Design of outlet protection protection from a round pipe flowing full,minimum tailwater condition(Tw<0.5 diameter).
Rev.12/93 8.06.3

TR55 Tc Worksheet
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2021
Hyd. No. 1
Culvert West - DA 1 + DA 4
Description A B C Totals
Sheet Flow
Manning's n-value = 0.400 0.011 0.011
Flow length (ft) = 100.0 0.0 0.0
Two-year 24-hr precip. (in) = 3.49 0.00 0.00
Land slope (%) = 2.91 0.00 0.00
Travel Time (min) = 17.70 + 0.00 + 0.00 = 17.70
Shallow Concentrated Flow
Flow length (ft) = 4970.00 0.00 0.00
Watercourse slope (%) = 1.55 0.00 0.00
Surface description = Unpaved Paved Paved
Average velocity (ft/s) =2.01 0.00 0.00
Travel Time (min) = 41.24 + 0.00 + 0.00 = 41.24
Channel Flow
X sectional flow area (sqft) = 0.00 0.00 0.00
Wetted perimeter (ft) = 0.00 0.00 0.00
Channel slope (%) = 0.00 0.00 0.00
Manning's n-value = 0.015 0.015 0.015
Velocity (ft/s) =0.00
0.00
0.00
Flow length (ft) ({0})0.0 0.0 0.0
Travel Time (min) = 0.00 + 0.00 + 0.00 = 0.00
Total Travel Time, Tc 58.90 min

TR55 Tc Worksheet
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2021
Hyd. No. 2
Culvert East - DA 2 + DA 5
Description A B C Totals
Sheet Flow
Manning's n-value = 0.011 0.000 0.011
Flow length (ft) = 100.0 0.0 0.0
Two-year 24-hr precip. (in) = 3.51 0.00 0.00
Land slope (%) = 3.97 0.00 0.00
Travel Time (min) = 0.88 + 0.00 + 0.00 = 0.88
Shallow Concentrated Flow
Flow length (ft) = 1671.43 0.00 0.00
Watercourse slope (%) = 1.69 0.00 0.00
Surface description = Unpaved Unpaved Paved
Average velocity (ft/s) =2.10 0.00 0.00
Travel Time (min) = 13.28 + 0.00 + 0.00 = 13.28
Channel Flow
X sectional flow area (sqft) = 0.00 0.00 0.00
Wetted perimeter (ft) = 0.00 0.00 0.00
Channel slope (%) = 0.00 0.00 0.00
Manning's n-value = 0.015 0.015 0.015
Velocity (ft/s) =0.00
0.00
0.00
Flow length (ft) ({0})0.0 0.0 0.0
Travel Time (min) = 0.00 + 0.00 + 0.00 = 0.00
Total Travel Time, Tc 14.20 min

Hydrograph Summary Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk,Inc.v2021
Hyd. Hydrograph Peak Time Time to Hyd. Inflow Maximum Total Hydrograph
No. type flow interval Peak volume hyd(s) elevation strge used Description
(origin) (cfs) (min) (min) (cuft) (ft) (cuft)
1 SCS Runoff 124.44 2 750 810,719 Culvert West-DA 1 +DA 4
2 SCS Runoff 81.35 2 722 229,569 Culvert East-DA 2+DA 5
240539.000 Culvert DA.gpw Return Period: 1 Year Friday, 10/25/2024

Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2021 Friday, 10/25/2024
Hyd. No. 1
Culvert West - DA 1 + DA 4
Hydrograph type = SCS Runoff Peak discharge = 124.44 cfs
Storm frequency = 1 yrs Time to peak = 12.50 hrs
Time interval = 2 min Hyd. volume = 810,719 cuft
Drainage area = 154.820 ac Curve number = 84*
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 58.90 min
Total precip. = 2.91 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
"Composite(Area/CN)=[(66.690 x 84)+(58.120 x 77)+(29.490 x 98)+(0.520 x 91)]/154.820
Culvert West - DA1 + DA4
Q (cfs) Hyd. No. 1 -- 1 Year Q (cfs)
140.00 140.00
120.00 120.00
100.00 100.00
80.00 80.00
60.00 60.00
40.00 40.00
I
20.00 20.00
0.00 — �- 0.00
0 2 4 6 8 10 12 14 16 18 20 22 24 26
Hyd No. 1 Time (hrs)

Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2021 Friday, 10/25/2024
Hyd. No. 2
Culvert East - DA 2 + DA 5
Hydrograph type = SCS Runoff Peak discharge = 81.35 cfs
Storm frequency = 1 yrs Time to peak = 12.03 hrs
Time interval = 2 min Hyd. volume = 229,569 cuft
Drainage area = 49.570 ac Curve number = 82*
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 14.20 min
Total precip. = 2.91 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
"Composite(Area/CN)=[(25.270 x 77)+(17.690 x 84)+(5.890 x 98)+(0.720 x 91)]/49.570
Culvert East - DA 2 + DA 5
Q (cfs) Hyd. No. 2 -- 1 Year Q (cfs)
90.00 - 90.00
80.00 80.00
70.00 70.00
60.00 60.00
50.00 50.00
40.00 40.00
30.00 30.00
20.00 20.00
10.00 10.00
0.00 - - 0.00
0 2 4 6 8 10 12 14 16 18 20 22 24 26
Hyd No. 2 Time (hrs)

Hydrograph Summary Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk,Inc.v2021
Hyd. Hydrograph Peak Time Time to Hyd. Inflow Maximum Total Hydrograph
No. type flow interval Peak volume hyd(s) elevation strge used Description
(origin) (cfs) (min) (min) (cuft) (ft) (cuft)
1 SCS Runoff 169.15 2 750 1,093,105 Culvert West-DA 1 +DA 4
2 SCS Runoff 112.02 2 722 314,191 Culvert East-DA 2+DA 5
240539.000 Culvert DA.gpw Return Period: 2 Year Friday, 10/25/2024

Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2021 Friday, 10/25/2024
Hyd. No. 1
Culvert West - DA 1 + DA 4
Hydrograph type = SCS Runoff Peak discharge = 169.15 cfs
Storm frequency = 2 yrs Time to peak = 12.50 hrs
Time interval = 2 min Hyd. volume = 1,093,105 cuft
Drainage area = 154.820 ac Curve number = 84*
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 58.90 min
Total precip. = 3.51 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
"Composite(Area/CN)=[(66.690 x 84)+(58.120 x 77)+(29.490 x 98)+(0.520 x 91)]/154.820
Culvert West - DA1 + DA4
Q (cfs) Hyd. No. 1 --2 Year Q (cfs)
180.00 180.00
160.00 160.00
140.00 140.00
120.00 120.00
100.00 100.00
80.00 80.00
60.00 60.00
40.00 40.00
20.00 20.00
0.00 — - 0.00
0 2 4 6 8 10 12 14 16 18 20 22 24 26
Hyd No. 1 Time (hrs)

Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2021 Friday, 10/25/2024
Hyd. No. 2
Culvert East - DA 2 + DA 5
Hydrograph type = SCS Runoff Peak discharge = 112.02 cfs
Storm frequency = 2 yrs Time to peak = 12.03 hrs
Time interval = 2 min Hyd. volume = 314,191 cuft
Drainage area = 49.570 ac Curve number = 82*
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 14.20 min
Total precip. = 3.51 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
"Composite(Area/CN)=[(25.270 x 77)+(17.690 x 84)+(5.890 x 98)+(0.720 x 91)]/49.570
Culvert East - DA 2 + DA 5
0 (cfs) Hyd. No. 2 --2 Year 0 (cfs)
120.00 120.00
100.00 1 100.00
80.00 80.00
60.00 60.00
40.00 40.00
20.00 20.00
0.00 — - ~ '- 0.00
0 2 4 6 8 10 12 14 16 18 20 22 24 26
Hyd No. 2 Time (hrs)

Hydrograph Summary Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk,Inc.v2021
Hyd. Hydrograph Peak Time Time to Hyd. Inflow Maximum Total Hydrograph
No. type flow interval Peak volume hyd(s) elevation strge used Description
(origin) (cfs) (min) (min) (cuft) (ft) (cuft)
1 SCS Runoff 238.55 2 750 1,537,463 Culvert West-DA 1 +DA 4
2 SCS Runoff 159.89 2 722 448,657 Culvert East-DA 2+DA 5
240539.000 Culvert DA.gpw Return Period: 5 Year Friday, 10/25/2024

Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2021 Friday, 10/25/2024
Hyd. No. 1
Culvert West - DA 1 + DA 4
Hydrograph type = SCS Runoff Peak discharge = 238.55 cfs
Storm frequency = 5 yrs Time to peak = 12.50 hrs
Time interval = 2 min Hyd. volume = 1,537,463 cuft
Drainage area = 154.820 ac Curve number = 84*
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 58.90 min
Total precip. = 4.41 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
"Composite(Area/CN)=[(66.690 x 84)+(58.120 x 77)+(29.490 x 98)+(0.520 x 91)]/154.820
Culvert West - DA1 + DA4
Q (cfs) Hyd. No. 1 -- 5 Year Q (cfs)
240.00 240.00
200.00 200.00
160.00 160.00
120.00 120.00
80.00 80.00
11
40.00 40.00
INV
0.00 - 0.00
0 2 4 6 8 10 12 14 16 18 20 22 24 26
Hyd No. 1 Time (hrs)

Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2021 Friday, 10/25/2024
Hyd. No. 2
Culvert East - DA 2 + DA 5
Hydrograph type = SCS Runoff Peak discharge = 159.89 cfs
Storm frequency = 5 yrs Time to peak = 12.03 hrs
Time interval = 2 min Hyd. volume = 448,657 cuft
Drainage area = 49.570 ac Curve number = 82*
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 14.20 min
Total precip. = 4.41 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
"Composite(Area/CN)=[(25.270 x 77)+(17.690 x 84)+(5.890 x 98)+(0.720 x 91)]/49.570
Culvert East - DA 2 + DA 5
0 (cfs) Hyd. No. 2 -- 5 Year 0 (cfs)
160.00 160.00
140.00 140.00
120.00 120.00
100.00 100.00
80.00 80.00
60.00 60.00
40.00 40.00
20.00 ...2 ..---... 20.00
0.00 — - • 0.00
0 2 4 6 8 10 12 14 16 18 20 22 24 26
Hyd No. 2 Time (hrs)

Hydrograph Summary Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk,Inc.v2021
Hyd. Hydrograph Peak Time Time to Hyd. Inflow Maximum Total Hydrograph
No. type flow interval Peak volume hyd(s) elevation strge used Description
(origin) (cfs) (min) (min) (cuft) (ft) (cuft)
1 SCS Runoff 293.57 2 748 1,894,600 Culvert West-DA 1 +DA 4
2 SCS Runoff 197.96 2 722 557,488 Culvert East-DA 2+DA 5
240539.000 Culvert DA.gpw Return Period: 10 Year Friday, 10/25/2024

Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2021 Friday, 10/25/2024
Hyd. No. 1
Culvert West - DA 1 + DA 4
Hydrograph type = SCS Runoff Peak discharge = 293.57 cfs
Storm frequency = 10 yrs Time to peak = 12.47 hrs
Time interval = 2 min Hyd. volume = 1,894,600 cuft
Drainage area = 154.820 ac Curve number = 84*
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 58.90 min
Total precip. = 5.11 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
"Composite(Area/CN)=[(66.690 x 84)+(58.120 x 77)+(29.490 x 98)+(0.520 x 91)]/154.820
Culvert West - DA1 + DA4
Q (cfs) Hyd. No. 1 -- 10 Year Q (cfs)
320.00 320.00
I
280.00 280.00
240.00 240.00
200.00 200.00
160.00 , 160.00
120.00 120.00
80.00 80.00
40.00 40.00
0.00 — _ 0.00
0 2 4 6 8 10 12 14 16 18 20 22 24 26
Hyd No. 1 Time (hrs)

Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2021 Friday, 10/25/2024
Hyd. No. 2
Culvert East - DA 2 + DA 5
Hydrograph type = SCS Runoff Peak discharge = 197.96 cfs
Storm frequency = 10 yrs Time to peak = 12.03 hrs
Time interval = 2 min Hyd. volume = 557,488 cuft
Drainage area = 49.570 ac Curve number = 82*
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 14.20 min
Total precip. = 5.11 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
"Composite(Area/CN)=[(25.270 x 77)+(17.690 x 84)+(5.890 x 98)+(0.720 x 91)]/49.570
Culvert East - DA 2 + DA 5
0 (cfs) Hyd. No. 2-- 10 Year 0 (cfs)
210.00 I 210.00
180.00 180.00
1
150.00 150.00
120.00 120.00
90.00 90.00
60.00 60.00
30.00 30.00
•-2 .-......"-----.' .
0.00 - - 0.00
0 2 4 6 8 10 12 14 16 18 20 22 24 26
Hyd No. 2 Time (hrs)

Culvert Report
Hydraflow Express Extension for Autodesk®Civil 3D®by Autodesk, Inc. Friday,Oct 25 2024
Culvert C - 1 Year
Invert Elev Dn (ft) = 504.00 Calculations
Pipe Length (ft) = 54.42 Qmin (cfs) = 2.82
Slope (%) = 1.60 Qmax (cfs) = 4.26
Invert Elev Up (ft) = 504.87 Tailwater Elev (ft) = (dc+D)/2
Rise (in) = 12.0
Shape = Circular Highlighted
Span (in) = 12.0 Qtotal (cfs) = 2.82
No. Barrels = 2 Qpipe (cfs) = 2.82
n-Value = 0.012 Qovertop (cfs) = 0.00
Culvert Type = Circular Concrete Veloc Dn (ft/s) = 2.23
Culvert Entrance = Groove end projecting (C) Veloc Up (ft/s) = 3.57
Coeff. K,M,c,Y,k = 0.0045, 2, 0.0317, 0.69, 0.2 HGL Dn (ft) = 504.75
HGL Up (ft) = 505.37
Embankment Hw Elev (ft) = 505.58
Top Elevation (ft) = 506.82 Hw/D (ft) = 0.71
Top Width (ft) = 39.53 Flow Regime = Inlet Control
Crest Width (ft) = 20.00
Elan(ft) Culvert C-1 Year Hw Depth(ft)
50700 -
I I I I I I 2.13
506.50 1.63
506.00 1.13
505.50 net contra 0.63
505.00 0.13
504.50 1 -0.37
504.00 -0.87
503.50 -1.37
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75
CircularCulvert HGL Embank
Reach(ft)

Culvert Report
Hydraflow Express Extension for Autodesk®Civil 3D®by Autodesk, Inc. Friday,Oct 25 2024
Culvert C - 10Year
Invert Elev Dn (ft) = 504.00 Calculations
Pipe Length (ft) = 54.42 Qmin (cfs) = 2.82
Slope (%) = 1.60 Qmax (cfs) = 4.26
Invert Elev Up (ft) = 504.87 Tailwater Elev (ft) = (dc+D)/2
Rise (in) = 12.0
Shape = Circular Highlighted
Span (in) = 12.0 Qtotal (cfs) = 4.26
No. Barrels = 2 Qpipe (cfs) = 4.26
n-Value = 0.012 Qovertop (cfs) = 0.00
Culvert Type = Circular Concrete Veloc Dn (ft/s) = 3.12
Culvert Entrance = Groove end projecting (C) Veloc Up (ft/s) = 4.14
Coeff. K,M,c,Y,k = 0.0045, 2, 0.0317, 0.69, 0.2 HGL Dn (ft) = 504.81
HGL Up (ft) = 505.49
Embankment Hw Elev (ft) = 505.78
Top Elevation (ft) = 506.82 Hw/D (ft) = 0.91
Top Width (ft) = 39.53 Flow Regime = Inlet Control
Crest Width (ft) = 20.00
Elev(ft) Culvert C-10 Year Hw Depth(ft)
507.00 2.13
506.50 1.63
506.00 1.13
505.50 0.63
505.00 0.13
504.50 1 -0.37
504.00 -0.87
503.50 -1.37
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75
Circular Culvert HGL Embank
Reach(ft)

Culvert Report
Hydraflow Express Extension for Autodesk®Civil 3D®by Autodesk, Inc. Friday,Oct 25 2024
Culvert East - 1 Year
Invert Elev Dn (ft) = 501.50 Calculations
Pipe Length (ft) = 37.18 Qmin (cfs) = 84.34
Slope (%) = 1.99 Qmax (cfs) = 197.96
Invert Elev Up (ft) = 502.24 Tailwater Elev (ft) = (dc+D)/2
Rise (in) = 48.0
Shape = Circular Highlighted
Span (in) = 48.0 Qtotal (cfs) = 84.34
No. Barrels = 1 Qpipe (cfs) = 84.34
n-Value = 0.022 Qovertop (cfs) = 0.00
Culvert Type = Circular Corrugate Metal Pipe Veloc Dn (ft/s) = 7.43
Culvert Entrance = Projecting Veloc Up (ft/s) = 9.04
Coeff. K,M,c,Y,k = 0.034, 1.5, 0.0553, 0.54, 0.9 HGL Dn (ft) = 504.89
HGL Up (ft) = 505.02
Embankment Hw Elev (ft) = 507.09
Top Elevation (ft) = 508.58 Hw/D (ft) = 1.21
Top Width (ft) = 32.06 Flow Regime = Inlet Control
Crest Width (ft) = 20.00
Elev (ft) Profile Hw Depth (ft)
509.00 6.76
508.00 5.76
507.00 Embankment i 1w 4.76
506.00 i 3.76
505.00 HGL 2.76
504.00 37.18 Lf of 48(in) @ 1.99 % - 1.76
503.00 0.76
502.00 - -0.24
501.00 -1.24
500.00 1 -2.24
0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0 45.0 50.0 55.0 60.0
Reach (ft)

Culvert Report
Hydraflow Express Extension for Autodesk®Civil 3D®by Autodesk, Inc. Friday,Oct 25 2024
Culvert East - 10 Year
Invert Elev Dn (ft) = 501.50 Calculations
Pipe Length (ft) = 37.18 Qmin (cfs) = 84.34
Slope (%) = 1.99 Qmax (cfs) = 197.96
Invert Elev Up (ft) = 502.24 Tailwater Elev (ft) = (dc+D)/2
Rise (in) = 48.0
Shape = Circular Highlighted
Span (in) = 48.0 Qtotal (cfs) = 197.94
No. Barrels = 1 Qpipe (cfs) = 123.71
n-Value = 0.022 Qovertop (cfs) = 74.23
Culvert Type = Circular Corrugate Metal Pipe Veloc Dn (ft/s) = 10.25
Culvert Entrance = Projecting Veloc Up (ft/s) = 11.04
Coeff. K,M,c,Y,k = 0.034, 1.5, 0.0553, 0.54, 0.9 HGL Dn (ft) = 505.17
HGL Up (ft) = 505.58
Embankment Hw Elev (ft) = 509.72
Top Elevation (ft) = 508.58 Hw/D (ft) = 1.87
Top Width (ft) = 32.06 Flow Regime = Inlet Control
Crest Width (ft) = 20.00
Elev (ft) Profile Hw Depth (ft)
510.00 7.76
Hw
509.00 6.76
508.00 5.76
507.00 Embankment 4.76
506.00 3.76
-
505.00 2.76
504.00 Lf of 48(in) @ 1.99 % 1.76
503.00 0.76
------------
502.00 -0.24 I
501.00 -1.24
500.00 I -2.24
0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0 45.0 50.0 55.0 60.0
Reach (ft)

Culvert Report
Hydraflow Express Extension for Autodesk®Civil 3D®by Autodesk, Inc. Friday,Oct 25 2024
Culvert West - 1 Year
Invert Elev Dn (ft) = 499.90 Calculations
Pipe Length (ft) = 38.64 Qmin (cfs) = 124.44
Slope (%) = 0.49 Qmax (cfs) = 293.57
Invert Elev Up (ft) = 500.09 Tailwater Elev (ft) = (dc+D)/2
Rise (in) = 48.0
Shape = Circular Highlighted
Span (in) = 48.0 Qtotal (cfs) = 124.44
No. Barrels = 2 Qpipe (cfs) = 124.44
n-Value = 0.022 Qovertop (cfs) = 0.00
Culvert Type = Circular Corrugate Metal Pipe Veloc Dn (ft/s) = 5.79
Culvert Entrance = Projecting Veloc Up (ft/s) = 8.00
Coeff. K,M,c,Y,k = 0.034, 1.5, 0.0553, 0.54, 0.9 HGL Dn (ft) = 503.09
HGL Up (ft) = 502.47
Embankment Hw Elev (ft) = 503.98
Top Elevation (ft) = 505.50 Hw/D (ft) = 0.97
Top Width (ft) = 22.00 Flow Regime = Inlet Control
Crest Width (ft) = 17.55
Elev (ft) Profile Hw Depth (ft)
506.00 5.91
505.00 4.91
Embankmcnt
504.00 - Ilw 3.91
503.00 HGL 2.91
, / -
502.00 38.G4 Lf of 48 in 0.4k % 1.91
501.00 0.91
500.00 - -E -0.09
499.00 -1.09
498.00 -2.09
0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0 45.0 50.0 55.0 60.0
Reach (ft)

Culvert Report
Hydraflow Express Extension for Autodesk®Civil 3D®by Autodesk, Inc. Friday,Oct 25 2024
Culvert West - 10 Year
Invert Elev Dn (ft) = 499.90 Calculations
Pipe Length (ft) = 38.64 Qmin (cfs) = 124.44
Slope (%) = 0.49 Qmax (cfs) = 293.57
Invert Elev Up (ft) = 500.09 Tailwater Elev (ft) = (dc+D)/2
Rise (in) = 48.0
Shape = Circular Highlighted
Span (in) = 48.0 Qtotal (cfs) = 293.54
No. Barrels = 2 Qpipe (cfs) = 225.13
n-Value = 0.022 Qovertop (cfs) = 68.41
Culvert Type = Circular Corrugate Metal Pipe Veloc Dn (ft/s) = 9.45
Culvert Entrance = Projecting Veloc Up (ft/s) = 8.96
Coeff. K,M,c,Y,k = 0.034, 1.5, 0.0553, 0.54, 0.9 HGL Dn (ft) = 503.50
HGL Up (ft) = 504.28
Embankment Hw Elev (ft) = 506.68
Top Elevation (ft) = 505.50 Hw/D (ft) = 1.65
Top Width (ft) = 22.00 Flow Regime = Inlet Control
Crest Width (ft) = 17.55
Elev (ft) Profile Hw Depth (ft)
507.00 6.91
- - FW
506.00 5.91
505.00 4.91
Embankment
N--..\cl
504.00 ° 3.91
-----
HGL .
503.00 2.91
502.00 38.G4 Lf of 48(in) @ 0.49 % 1.91
501.00 0.91
500.00 - -0.09
499.00 -1.09
498.00 1 -2.09
0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0 45.0 50.0 55.0 60.0
Reach (ft)

240539.000 Central Cowboy Church I Town of Midland
11777 US-601, Midland,NC 28107
Supporting Information
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a Hydrologic Soil Group—Cabarrus County,North Carolina a
zo (240539.000 Hydro-Soilmap) M
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P Map Scale:1:3,560 if printed on A landscape(11"x 8.5")sheet. m
Meters N
0 50 100 200 300
Feet
A0 150 300 600 900
Map projection:Web Mercator Comer coordinates:WGS84 Edge tics:UTM Zone 17N WGS84
USDA Natural Resources Web Soil Survey 8/30/2024
Conservation Service National Cooperative Soil Survey Page 1 of 4

Hydrologic Soil Group—Cabarrus County,North Carolina
(240539.000 Hydro-Soilmap)
MAP LEGEND MAP INFORMATION
Area of Interest(AOI) p c The soil surveys that comprise your AOI were mapped at
Area of Interest(AOI) 1:24,000.
0 CID
Soils • D Warning:Soil Map may not be valid at this scale.
Soil Rating Polygons
0 A p Not rated or not available Enlargement of maps beyond the scale of mapping can cause
misunderstanding of the detail of mapping and accuracy of soil
n A/D Water Features line placement.The maps do not show the small areas of
Streams and Canals contrasting soils that could have been shown at a more detailed
n B scale.
Transportation
Q B/D
r4-1. Rails Please rely on the bar scale on each map sheet for map
n C measurements.
ti Interstate Highways
n CID US Routes Source of Map: Natural Resources Conservation Service
Web Soil Survey URL:
0 D Major Roads Coordinate System: Web Mercator(EPSG:3857)
n Not rated or not available Local Roads
Maps from the Web Soil Survey are based on the Web Mercator
Soil Rating Lines Background projection,which preserves direction and shape but distorts
• • A distance and area.A projection that preserves area,such as the
1111 Aerial Photography Albers equal-area conic projection,should be used if more
• • A/D accurate calculations of distance or area are required.
^r B This product is generated from the USDA-NRCS certified data as
.v B/D of the version date(s)listed below.
• r C Soil Survey Area: Cabarrus County, North Carolina
Survey Area Data: Version 23,Sep 13,2023
• • CID
Soil map units are labeled(as space allows)for map scales
• • D 1:50,000 or larger.
• w Not rated or not available Date(s)aerial images were photographed: Mar 13,2022—May
Soil Rating Points 9,2022
p A The orthophoto or other base map on which the soil lines were
compiled and digitized probably differs from the background
O A/D imagery displayed on these maps.As a result,some minor
• B shifting of map unit boundaries may be evident.
• B/D
USDA Natural Resources Web Soil Survey 8/30/2024
Conservation Service National Cooperative Soil Survey Page 2 of 4

Hydrologic Soil Group—Cabarrus County, North Carolina 240539.000 Hydro-Soilmap
Hydrologic Soil Group
Map unit symbol Map unit name Rating Acres in AOI Percent of AOI
BaB Badin channery silt C 8.7 22.6%
loam,2 to 8 percent
slopes
KkB Kirksey silt loam, 1 to 6 C 10.6 27.3%
percent slopes
MsA Misenheimer channery C/D 19.4 50.1%
silt loam,0 to 4
percent slopes
Totals for Area of Interest 38.7 100.0%
Description
Hydrologic soil groups are based on estimates of runoff potential. Soils are
assigned to one of four groups according to the rate of water infiltration when the
soils are not protected by vegetation, are thoroughly wet, and receive
precipitation from long-duration storms.
The soils in the United States are assigned to four groups (A, B, C, and D) and
three dual classes (A/D, B/D, and C/D). The groups are defined as follows:
Group A. Soils having a high infiltration rate (low runoff potential)when
thoroughly wet. These consist mainly of deep, well drained to excessively
drained sands or gravelly sands. These soils have a high rate of water
transmission.
Group B. Soils having a moderate infiltration rate when thoroughly wet. These
consist chiefly of moderately deep or deep, moderately well drained or well
drained soils that have moderately fine texture to moderately coarse texture.
These soils have a moderate rate of water transmission.
Group C. Soils having a slow infiltration rate when thoroughly wet. These consist
chiefly of soils having a layer that impedes the downward movement of water or
soils of moderately fine texture or fine texture. These soils have a slow rate of
water transmission.
Group D. Soils having a very slow infiltration rate (high runoff potential)when
thoroughly wet. These consist chiefly of clays that have a high shrink-swell
potential, soils that have a high water table, soils that have a claypan or clay
layer at or near the surface, and soils that are shallow over nearly impervious
material. These soils have a very slow rate of water transmission.
If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is
for drained areas and the second is for undrained areas. Only the soils that in
their natural condition are in group D are assigned to dual classes.
USDA Natural Resources Web Soil Survey 8/30/2024
Conservation Service National Cooperative Soil Survey Page 3 of 4

Hydrologic Soil Group—Cabarrus County, North Carolina 240539.000 Hydro-Soilmap
Rating Options
Aggregation Method: Dominant Condition
Component Percent Cutoff.None Specified
Tie-break Rule: Higher
USDA Natural Resources Web Soil Survey 8/30/2024
Conservation Service National Cooperative Soil Survey Page 4 of 4

a Soil Map—Cabarrus County,North Carolina a
gi° (240539.000 Soilmap)
M N
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3 3
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A Map Scale:1:3,560 if printed on A landscape(11"x 8.5")sheet. m
N Meters
0 50 100 200 300
Feet
A0 150 300 600 900
Map projection:Web Mercator Comer coordinates:WGS84 Edge tics:UTM Zone 17N WGS84
USDA Natural Resources Web Soil Survey 8/30/2024
Conservation Service National Cooperative Soil Survey Page 1 of 3

Soil Map—Cabarrus County,North Carolina
(240539.000 Soilmap)
MAP LEGEND MAP INFORMATION
Area of Interest(AOI) Spoil Area The soil surveys that comprise your AOI were mapped at
Area of Interest(AOI) 1:24,000.
Q Stony Spot
Soils 44 Very Stony Spot Warning:Soil Map may not be valid at this scale.
0 Soil Map Unit Polygons
Wet Spot Enlargement of maps beyond the scale of mapping can cause
.�� Soil Map Unit Lines misunderstanding of the detail of mapping and accuracy of soil
Other line placement.The maps do not show the small areas of
p Soil Map Unit Points contrasting soils that could have been shown at a more detailed
Special Line Features
Special Point Features scale.
(o, Blowout Water Features
Streams and Canals Please rely on the bar scale on each map sheet for map
cs Borrow Pit measurements.
Transportation
X Clay Spot Rails Source of Map: Natural Resources Conservation Service
0 Closed Depression Web Soil Survey URL:
ti Interstate Highways Coordinate System: Web Mercator(EPSG:3857)
X Gravel Pit US Routes
Maps from the Web Soil Survey are based on the Web Mercator
,. Gravelly Spot Major Roads projection,which preserves direction and shape but distorts
distance and area.A projection that preserves area,such as the
0 Landfill Local Roads Albers equal-area conic projection,should be used if more
Lava Flow accurate calculations of distance or area are required.
Background
46 Marsh or swamp Aerial Photography This product is generated from the USDA-NRCS certified data as
of the version date(s)listed below.
iRk Mine or Quarry
Soil Survey Area: Cabarrus County, North Carolina
O Miscellaneous Water Survey Area Data: Version 23,Sep 13,2023
Q Perennial Water Soil map units are labeled(as space allows)for map scales
v Rock Outcrop 1:50,000 or larger.
▪ Saline Spot Date(s)aerial images were photographed: Mar 13,2022—May
9,2022
Sandy Spot
The orthophoto or other base map on which the soil lines were
Severely Eroded Spot compiled and digitized probably differs from the background
imagery displayed on these maps.As a result,some minor
• Sinkhole shifting of map unit boundaries may be evident.
3) Slide or Slip
oa Sodic Spot
Natural Resources Web Soil Survey 8/30/2024
Conservation Service National Cooperative Soil Survey Page 2 of 3

Soil Map—Cabarrus County, North Carolina 240539.000 Soilmap
Map Unit Legend
Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI
BaB Badin channery silt loam,2 to 8.7 22.6%
8 percent slopes
KkB Kirksey silt loam, 1 to 6 10.6 27.3%
percent slopes
MsA Misenheimer channery silt 19.4 50.1%
loam,0 to 4 percent slopes
Totals for Area of Interest 38.7 100.0%
USDA Natural Resources Web Soil Survey 8/30/2024
Conservation Service National Cooperative Soil Survey Page 3 of 3

8/30/24,8:50 AM Precipitation Frequency Data Server
NOAA Atlas 14,Volume 2,Version 3
06. Location name: Midland, North Carolina,USA* - "N
i 3f 1; Latitude:35.2551°, Longitude:-80.4998° E n0nn
Elevation: m/ft**
*source:ESRI Maps ''a,, yr�
1e601- *'source:USGS `
POINT PRECIPITATION FREQUENCY ESTIMATES
G.M.Bonnin,D.Martin,B.Lin,T.Parzybok,M.Yekta,and D.Riley
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/hour)1
Average recurrence interval(years)
Duration 1 2 5 10 25 50 100 200 500 1000
5-min 4.88 5.76 6.71 7.37 8.12 8.63 9.10 9.49 9.92 10.2
(4.50-5.30) (5.30-6.28) (6.16-7.30) (6.76-7.99) (7.42-8.80) (7.84-9.35) (8.22-9.84) (8.54-10.3) (8.86-10.8) (9.05-11.1)
10-min 3.90 4.61 5.36 5.90 6.47 6.88 7.22 7.52 7.85 8.05
(3.59-4.23) (4.24-5.02) (4.93-5.84)_ (5.40-6.40) (5.90-7.01) (6.25-7.44) (6.53-7.82) (6.77-8.15) (7.00-8.51) (7.13-8.74)
15-min 3.25 3.86 4.52 4.97 5.47 5.80 6.09 6.32 6.58 6.74
(2.99-3.53) (3.56-4.20) (4.16-4.92) (4.56-5.39) (4.99-5.92) (5.27-6.28) (5.50-6.59) (5.69-6.85) (5.88-7.14) (5.96-7.32)
30-min 2.23 2.67 3.22 3.60 4.05 4.37 4.66 4.92 5.24 5.45
(2.05-2.42) (2.45-2.90) (2.95-3.50)_ (3.30-3.91) (3.70-4.39) (3.97-4.73)_ (4.22-5.04) (4.43-5.33) (4.68-5.68) (4.83-5.92)
60-min 1.39 1.67 2.06 2.34 2.70 2.96 3.21 3.45 3.76 3.98
(1.28-1.51) (1.54-1.82) (1.89-2.24) (2.15-2.54) (2.46-2.92) (2.69-3.20) (2.90-3.47) (3.11-3.74) (3.35-4.08) I (3.52-4.32)
2-hr 0.801 0.970 1.20 1.38 1.60 1.78 1.94 2.10 2.32 2.48
(0.735-0.876) (0.888-1.06) (1.10-1.32) (1.26-1.50) (1.46-1.75) (1.60-1.93) (1.74-2.11) (1.88-2.30) (2.05-2.53) (2.17-2.70)
3-hr 0.570 0.688 0.859 0.990 1.16 1.30 1.44 1.58 1 1.77 1.91
(0.522-0.625) (0.630-0.755) (0.786-0.942) (0.902-1.08) (1.06-1.27) (1.18-1.42) (1.29-1.56) (1.40-1.72) (1.55-1.92) (1.66-2.09)
6-hr 0.345 0.416 0.519 0.600 1 0.709 0.795 0.882 0.971 1.09 1.19
(0.316-0.378) (0.381-0.456) (0.475-0.568) (0.547-0.655)(0.642-0.772) (0.716-0.864) (0.789-0.959) (0.861-1.06) (0.956-1.19) (1.03-1.29)
12-hr 0.203 0.245 0.308 0.357 0.425 0.480 0.537 0.596 0.677 0.743
(0.187-0.222) (0.225-0.269) (0.282-0.337) (0.327-0.391) (0.386-0.463) (0.432-0.522) (0.478-0.582) (0.525-0.645) (0.587-0.733) (0.635-0.804)
24-hr 0.121 0.146 0.183 0.212 0.252 0.284 0.317 0.351 0.397 0.434
(0.112-0.130) (0.135-0.158) (0.170-0.198) (0.197-0.230) (0.233-0.273) (0.262-0.307) (0.291-0.342) (0.321-0.379) (0.362-0.429) (0.394-0.470)
2-day 0.071 0.085 0.106 0.123 0.145 0.163 0.182 0.201 0.227 0.247
(0.065-0.076) (0.079-0.092) (0.099-0.114),(0.114-0.132) (0.134-0.156) (0.150-0.176)1(0.167-0.195) (0.184-0.216) (0.207-0.244) (0.224-0.267)
3-day 0.050 0.060 0.074 0.086 0.101 0.114 0.127 0.140 0.158 0.172
(0.046-0.053) (0.056-0.064) (0.069-0.080) (0.079-0.092) (0.094-0.109) (0.105-0.122) (0.116-0.136) (0.128-0.150)I(0.144-0.170) (0.156-0.185)
4-day 0.039 0.047 0.058 0.067 0.079 0.089 0.099 0.109 0.123 0.134
(0.037-0.042) (0.044-0.051) (0.054-0.063) (0.062-0.072) (0.073-0.085) (0.082-0.096) (0.091-0.106) (0.100-0.117) (0.112-0.132) (0.122-0.144)
7-day 0.026 0.031 0.038 _ 0.043 0.050 0.056 0.062 0.069 0.077 0.084
(0.024-0.027) (0.029-0.033) (0.035-0.040) (0.040-0.046) (0.047-0.054) (0.052-0.060) (0.058-0.067) (0.064-0.073) (0.071-0.083) (0.077-0.090)
10-day 0.021 0.024 0.030 0.034 0.039 0.043 0.047 0.052 0.058 0.062
(0.019-0.022) (0.023-0.026) (0.028-0.031) (0.031-0.036) (0.036-0.041) (0.040-0.046) (0.044-0.050) (0.048-0.055) (0.053-0.061) (0.057-0.066)
20-day 0.014 0.016 0.019 0.022 0.025 0.027 0.030 0.032 0.036 0.038
(0.013-0.014) (0.015-0.017) (0.018-0.020) (0.020-0.023) (0.023-0.026) (0.026-0.029) (0.028-0.031) (0.030-0.034) (0.033-0.038) (0.036-0.041)
30-day 0.011 0.013 0.015 0.017 0.019 0.021 0.023 0.024 0.027 0.028
(0.010-0.012) (0.012-0.014) (0.014-0.016) (0.016-0.018) (0.018-0.020) (0.020-0.022) (0.021-0.024) (0.023-0.026) (0.025-0.028) (0.027-0.030)
45-day 0.009 0.011 0.012 0.014 0.015 0.017 0.018 0.019 0.020 0.022
(0.009-0.010) (0.010-0.011) (0.012-0.013) (0.013-0.014) (0.015-0.016) (0.016-0.017) (0.017-0.019) (0.018-0.020) (0.019-0.022) (0.020-0.023)
60-day 0.008 0.010 0.011 0.012 0.013 0.014 0.015 0.016 0.017 0.018
(0.008-0.009) (0.009-0.010) (0.010-0.011) (0.011-0.012) (0.013-0.014) (0.014-0.015) (0.014-0.016) (0.015-0.017) (0.016-0.018) (0.017-0.019)
1 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.
Back to Top
PF graphical
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8/30/24,8:50 AM Precipitation Frequency Data Server
PDS-based intensity-duration-frequency (IDF) curves
Latitude: 35.2551°, Longitude: -80.4998°
101 Average recurrence
interval
_ � (years)
L
Cs — 1
Z. 10° - - \ 2
— 5a \`
c \ — 10
- 25
o \ — 50
m 10-1 - \= .. — 100
\\\ — 200
a �` 500
— 1000
10-2 - i
r t t t 1 t t t 1 t I t
•E •E •E •E •E L L L L L NO f0 �0 NO Np NO z0 z0 NO
N f�1 N 4 'CVO ID -0 7 7 77
r-I Ni (.1f�14 I�
m Duration N m v tfa
101 - . -
'-
L
G
Duration
Z. 10° -
VI
c 5-mm — 2-day
a
— 10-rrnn — 3-day
c 15-mm — 4-day
a 10-1 - 30-min — 7-day
•a — 60-nin — 10-day
ll — 2-hr — 20-day
a` — 3-hr — 30-day
— 6-hr - 45-day
10-2 - — 12-hr — 60-day
t t , t . t 1 t 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):Fri Aug 30 12:50:11 2024
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Small scale terrain
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8/30/24,8:50AM Precipitation Frequency Data Server
111"11111144
,, r�
Large scale terrain
t �-
Winston-Salem
• • Durham
Greensboro •
Mt Mitch- ell Raleii
•Asheville •
NORTHIC AROLINA
•Chirllootte Fayetteville•
•Greenville Elilrn
en" T-7 ''AROLINA100km
60mi
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-
Johnson City
im
instonS tern Greensboro Ddrh uuu Raleii
Ash, II North
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I of ettevil
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60mi 0
Large scale aerial
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8/30/24,8:50 AM Precipitation Frequency Data Server
• Johnson City
• Winston-Salem
Greensboro Durham .
Ralei
Asheville •
• North
Carolina.
Charlotte
Fayettevi
Greenville •
•
100km
60mi •umbia
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US Department of Commerce
National Oceanic and Atmospheric Administration
National Weather Service
National Water Center
1325 East West Highway
Silver Spring,MD 20910
Questions?:[e-mail]
Disclaimer
https://hdsc.nws.noaa.gov/pfds/pfds_printpage.html?lat=35.2551&Ion=-80.4998&data=intensity&units=english&series=pds 4/4

8/30/24,8:49 AM Precipitation Frequency Data Server
NOAA Atlas 14,Volume 2,Version 3
06* °���Location name: Midland, North Carolina,USA* "N
i 3f 1; Latitude:35.2551°, Longitude:-80.4998° E nonn
Elevation: 505 ft**
*source:ESRI Maps 111 yr�
1e60� *'source:USGS •"`""`
POINT PRECIPITATION FREQUENCY ESTIMATES
G.M.Bonnin,D.Martin,B.Lin,T.Parzybok,M.Yekta,and D.Riley
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 0.407 0.480 0.559 0.614 0.677 0.719 0.758 0.791 0.827 0.852
(0.375-0.442) (0.442-0.523) (0.513-0.608) (0.563-0.666) (0.618-0.733) (0.653-0.779) (0.685-0.820) (0.712-0.856) (0.738-0.897) (0.754-0.925)
10-min 0.650 0.768 0.894 0.983 1.08 1.15 1.20 1.25 1.31 1.34
(0.599-0.705) (0.707-0.836) (0.822-0.973) (0.900-1.07) (0.984-1.17) (1.04-1.24) (1.09-1.30) (1.13-1.36) (1.17-1.42) (1.19-1.46)
15-min 0.812 0.965 1.13 1.24 1.37 1.45 1.52 1.58 1.65 1.68
(0.748-0.882) (0.889-1.05) (1.04-1.23) (1.14-1.35) (1.25-1.48) (1.32-1.57) (1.38-1.65) (1.42-1.71) (1.47-1.79) (1.49-1.83)
30-min 1.11 1.33 1.61 1.80 2.02 2.18 2.33 2.46 2.62 2.73
(1.03-1.21) (1.23-1.45) (1.48-1.75)_ (1.65-1.95) (1.85-2.19) (1.98-2.36) (2.11-2.52) (2.22-2.67) (2.34-2.84) (2.42-2.96)
60-min 1.39 1.67 2.06 2.34 2.70 2.96 3.21 3.45 3.76 3.98
(1.28-1.51) (1.54-1.82) (1.89-2.24) (2.15-2.54) (2.46-2.92) (2.69-3.20) (2.90-3.47) (3.11-3.74) (3.35-4.08) I (3.52-4.32)
2-hr 1.60 1.94 2.41 2.76 3.21 3.55 3.88 4.21 4.64 4.96
(1.47-1.75) (1.78-2.12) (2.20-2.63) (2.51-3.01) (2.91-3.50) (3.20-3.86) (3.49-4.23) (3.76-4.59) (4.10-5.06) (4.34-5.41)
3-hr 1.71 2.07 2.58 2.97 3.50 3.91 4.32 4.74 5.31 I 5.75
(1.57-1.88) (1.89-2.27) (2.36-2.83)_ (2.71-3.25) (3.17-3.82) (3.53-4.26) (3.87-4.70) (4.22-5.16) (4.66-5.78) (4.99-6.27)
6-hr 2.07 2.49 3.11 3.60 4.25 4.76 5.29 5.82 6.55 7.12
(1.90-2.27) (2.28-2.73) (2.85-3.41) (3.28-3.93) (3.85-4.62) (4.29-5.18) (4.73-5.74) (5.16-6.32) (5.73-7.11) (6.16-7.74)
12-hr 2.45 2.96 3.71 4.31 5.13 5.79 6.47 7.18 8.16 8.95
(2.25-2.68) (2.72-3.25) (3.40-4.06) (3.94-4.72) (4.65-5.59)_ (5.21-6.30) (5.77-7.02) (6.33-7.78) (7.08-8.83) (7.66-9.70)
24-hr 2.91 3.51 4.41 5.11 6.07 6.84 7.62 8.43 9.54 10.4
(2.70-3.14) (3.26-3.79) (4.09-4.76) (4.73-5.52) (5.60-6.56) (6.30-7.38) (7.00-8.23) (7.72-9.10)_ (8.69-10.3) i (9.46-11.3)
2-day 3.41 4.11 5.12 5.92 7.00 7.87 8.75 9.66 10.9 ' 11.9
(3.16-3.67) (3.82-4.43) (4.75-5.52) (5.48-6.37) (6.47-7.53) (7.25-8.46) (8.04-9.41) (8.85-10.4) (9.94-11.8) (10.8-12.8)
3-day 3.61 4.34 5.39 6.21 7.34 8.23 9.14 10.1 11.4 12.4
(3.36-3.88) (4.04-4.67) (5.00-5.79) (5.76-6.67) (6.78-7.87)__ (7.59-8.84)_ (8.41-9.82) (9.25-10.8) (10.4-12.3) (11.3-13.4)
4-day 3.82 4.58 5.66 6.50 7.67 8.59 I 9.54 10.5 11.9 12.9
(3.55-4.09) (4.26-4.91) (5.26-6.06) (6.03-6.97) (7.09-8.22) (7.93-9.22)j (8.78-10.2) (9.65-11.3) (10.8-12.8)_i (11.8-13.9)
7-day 4.40 5.24 6.39 7.30 8.55 9.55 10.6 11.6 13.1 14.2
(4.13-4.69) (4.92-5.60) (5.99-6.82) (6.83-7.78) (7.98-9.12) (8.89-10.2) (9.81-11.3) (10.8-12.4) (12.0-14.0) (13.0-15.2)
10-day 5.04 6.00 7.21 8.16 9.45 10.5 11.5 12.5 13.9 15.0
(4.74-5.36) (5.64-6.38) (6.77-7.66) (7.66-8.67) (8.84-10.0) (9.76-11.1)_ (10.7-12.2) (11.6-13.3) (12.9-14.8) (13.9-16.0)
20-day 6.77 7.99 9.44 10.6 12.1 13.3 14.5 15.8 17.4 18.7
(6.40-7.15) (7.56-8.44) (8.92-9.96) (9.98-11.2) (11.4-12.8) (12.5-14.1) (13.6-15.3) (14.7-16.7) (16.2-18.4) (17.4-19.9)
30-day 8.32 9.78 11.4 12.6 14.2 15.5 16.7 18.0 19.6 20.9
(7.89-8.76) (9.28-10.3) (10.8-12.0)_ (11.9-13.3) (13.5-15.0) (14.6-16.3) (15.8-17.6) (16.9-19.0) (18.4-20.7) (19.5-22.1)
45-day 10.5 12.3 14.0 15.4 17.1 18.5 I 19.8 21.0 22.7 23.9
(10.0-11.0) (11.7-12.8) (13.4-14.7) (14.6-16.1) (16.3-17.9) (17.5-19.3) (18.7-20.7) (19.9-22.0) (21.4-23.8) (22.5-25.2)
60-day 12.5 14.6 16.5 17.9 19.8 21.3 22.6 1 24.0 ' 25.7 27.0
(12.0-13.1) (14.0-15.2) (15.8-17.2) (17.2-18.7) (18.9-20.7) (20.3-22.2)] (21.5-23.6) 1 (22.8-25.1) I (24.4-26.9) (25.6-28.3)
1 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.
Back to Top
PF graphical
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8/30/24,8:49 AM Precipitation Frequency Data Server
PDS-based depth-duration-frequency (DDF) curves
Latitude: 35.2551°, Longitude: -80.4998°
Average recurrence
25 interval
(years)
— 1
c 20 - 2
L
a / — 5
-0 15 - — 10
o �� — 50
a 10 — 100
V
aa) W 5 - J _ 111- /-�_�� 500
`� �— — 1000
0
I r
c c c c c L L. L >. >.>, >, >, >, >, >,>,
C E Lii L L L L 0
r0 r0 40 r0 40 r0 r0 r0
r-I N O O O u Y O
IC/:):1Duration `~ 'J' ,-I N in Cr v,
25 -
1 20 -
_c
Duration
aa) 111110M 5-mm — 2-day
15 J — 10{rnn — 3day
15-min — 4-day
r0
a 10 - �- 30 min — 7-day�rff — 60-nin — 10-day
a` _ ___ — 2-hr — 20-day
5 — — 3-hr — 30-day
— 6-hr — 45-day
0- - --
— 12-hr — 60-day
i - I t 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):Fri Aug 30 12:49:313 2024
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8/30/24,8:49 AM Precipitation Frequency Data Server
U
3km
2mi
_ Lar ee scale terrain
t• Bristol
tCity• 0 0
Winston-Salem
• • Durham
Greensboro •
r It Mitchell Raleii
•Asheville •
NORTHIC .AROLINA
•Chirffootte Fayetteville.
• F.
Greenville Eliim
T-7 ''AROLINA100km
60mi
Large scale map
Johnson City
insW tonSllem Greensboro
o Ddrham
Raleir
Ash, II North
Carolina
I F ettevi I
oGr-- le
100km \
ti olurt)i]
60mi
Large scale aerial
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8/30/24,8:49 AM Precipitation Frequency Data Server
• Johnson City
• Winston-Salem
Greensboro Durham •
•
s :a' Ralei
-Asheville' '�`�" •
• "'f' North
Carolina
Charlotte
Fayettevi
Greenville •
•
100km
•60mi umbia
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National Oceanic and Atmospheric Administration
National Weather Service
National Water Center
1325 East West Highway
Silver Spring,MD 20910
Questions?:[e-mail]
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Table 4: HSGs for North Carolina Soil Types
Urban areas runoff curve numbers for SCS method(SCS 1986)
Cover Description Curve Number by HSG
A B C D
Fully developed urban areas
Open Space(lawns.parks.golf courses,etc.)
Poor condition(<50%grass cover) 68 79 86 89
Fair condition(50%to 75%grass cover) 49 69 79 84
Good condition(>75%grass cover) 39 61 74 80
Impervious areas.
Paved parking lots.roofs.driveways. etc. 98 98 98 98
Streets and roads:
Paved:curbs and storm sewers 98 98 98 98
Paved:open ditches 83 89 98 98
Gravel 76 85 89 91
Dirt 72 82 85 88
Developing urban areas
Newly graded areas 77 86 91 94
Pasture(<50%ground cover or heavily grazed) 68 79 86 89
Pasture(50%to 75%ground cover or not heavily grazed) 49 69 79 84
Pasture(>75%ground cover or lightly grazed) 39 61 74 80
Meadow—continuous grass,protected from grazing and 30 58 71 78
generally mowed for hay
Brush(<50%ground cover) 48 67 77 83
Brush(50%to 75%ground cover) 35 56 70 77
Brush(>75%ground cover) 30 48 65 73
Woods(Forest litter,small trees,and brush destroyed by 45 66 77 83
heavy grazing or regular burning)
Woods(Woods are grazed but not burned,and some 36 60 73 79
forest litter covers the sal)
Woods(Woods are protected from grazing,and litter and 30 55 70 77
brush adequately cover the soil)