20240475 Ver 1_R-5711 - HYD SMP Mar 2024_20240327

Highway
„u ....,
(Version 3.00; Released August 2021)
North Carolina Department of Transportation
Highway Stormwater Program
STORMWATER MANAGEMENT PLAN^^�
FOR NCDOT PROJECTS
�\
\^)
WBS Element: 50207.1.1
TIP/Prof No: R-5711 County(ies): Iredell Page 1 of 3
General Project Information
WBS Element:
50207.1.1 TIP Number: R-5711 Project Type: Roadway Relocation Date: 3/8/2024
NCDOT Contact:
Bryan K. Sowell, PE
Contractor 1 Designer:
DRMP / Ryan P. Mitchell, P.E.
Address:
PO Box 47
Shelby, NC 27151-0047
Address:
8000 Regency Parkway
Suite 110
Cary, NC 27518
Phone:
[phone]
id
Phone: (919)
650-1038
Email:
[e-mail]
Email:
[e-mail]
City/Town:
Troutman, NC
County(ies):
Iredell
River Basin(s):
Catawba Yadkin -Pee Dee
CAMA County?
No
Wetlands within Project Limits?
No
Project Description
Project Length (lin. miles or feet):
0.310 mi
Surrounding Land Use: Suburban/Commercial
Proposed Project
Existing Site
Project Built -Upon Area (ac.)
3.6 ac.
2.4 ac.
Typical Cross Section Description:
One (1) 12' travel lane each direction. 8' paved shoulders with grass roadway ditches, both sides. 8'
shoulders (4' paved) with guardrail where applicable.
One (1) 12' travel lane each direction with 2' paved shoulders.
Annual Avg Daily Traffic (veh/hrlday):
Design/Future: 1 19000 Year: 12040
1 Existing: 1 15500 Year: 1 2019
General Project Narrative:
(Description of Minimization of Water
Quality Impacts)
The R-5711 project is focused on improving the intersection at US 21 and SR 1312 (Flower House Loop)/SR 2375 (Houston Road). Grass swales have been incorporated in roadside ditches, where
possible, to reduce the velocity and promote the infiltration of runoff. Riprap at pipe outlets, ditches, and streambanks has been incorporated to minimize erosion on slopes where vegetation will not
be adequate. NCDOT standards for ground cover, vegetation, and slope stabilization will be adhered to during the life of this project, and will be specified in the NCDOT Erosion and Sediment
Control Plan for the project.

Highway North Carolina Department of Transportation
tf'r Highway Stormwater Program
STORMWATER MANAGEMENT PLAN
(Version 3.00; Released August 2021) FOR NCDOT PROJECTS
WBS Element: 50207.1.1 TIP/Pro' No.: R-5711 Count ies : Iredell Page 2 of 3
General Project Information
Waterbody Information
Surface Water Body (1): Rocky Creek (Youngs Creek)
NCDWR Stream Index No.:
11-84-(1)
NCDWR Surface Water Classification for Water Body
Primary Classification:
Water Supply IV (WS-IV)
Supplemental Classification:
None
Other Stream Classification:
None
Impairments:
None
Aquatic T&E Species?
No Comments:
NRTR Stream ID:
Rocky Creek
IBuffer Rules in Effect: I Catawba
Project Includes Bridge Spanning Water Body?
No
IDeck Drains Discharge Over Buffer? I N/A
iDissipator Pads Provided in Buffer? I N/A
Deck Drains Discharge Over Water Bod
I N/A
(If yes, provide justification in the General Project Narrative)
I
(If yes, describe in the General Project Narrative; if no, justify in the
I General Project Narrative)
(If yes, provide justification in the General Project Narrative)
Surface Water Body 2 : 1 Weathers Creek
NCDWR Stream Index No.:
12-108-21-3-1
NCDWR Surface Water Classification for Water Body
Primary Classification:
Class C
Supplemental Classification:
None
Other Stream Classification:
None
Impairments:
None
Aquatic T&E Species?
No I Comments:
NRTR Stream ID:
Weathers Creek
Buffer Rules in Effect: N/A
Project Includes Bridge Spanning Water Body?
INo
IDeck Drains Discharge Over Buffer? I N/A
Dissipator Pads Provided in Buffer? I N/A
Deck Drains Discharge Over Water Body?
I N/A
(If yes, provide justification in the General Project Narrative)
(If yes, describe in the General Project Narrative; if no, justify in the
General Project Narrative)
(If yes, provide justification in the General Project Narrative)
Surface Water Body (3): 1
NCDWR Stream Index No.:
NCDWR Surface Water Classification for Water Body
Primary Classification:
Supplemental Classification:
Other Stream Classification:
Impairments:
Aquatic T&E Species?
Comments:
NRTR Stream ID:
Buffer Rules in Effect:
Project Includes Bridge Spanning Water Bo d
Deck Drains Discharge Over Buffer? I
Dissi ator Pads Provided in Buffer?
Deck Drains Discharge Over Water Body?
(If yes, provide justification in the General Project Narrative)
(If yes, describe in the General Project Narrative; if no, justify in the
General Project Narrative)
(If yes, provide justification in the General Project Narrative)

North Carolina Department of Transportation
torn iten d
..,.., Highway Stormwater Program
STORMWATER MANAGEMENT PLAN
(Version 3.00; Released August 12021)1 FOR NCDOT PROJECTS
WBS Element: 50207.1.1 TIP/Pro' No.: R-5711 Count ies : Iredell Page 3 of 3
Swale
Sheet
No.
Line
Station
Location
(LT,RT,CL)
Latitude
Longitude
Surface Water Body
Base Width
ft
Front
Slope
H:1
Back
Slope
H:1
Drainage
Area
ac
Recommended
Treatm't Length
ft
Actual
Length
ft
Longitudinal
Slope
%
Q2
cfs
V2
(fps)
Q10
cfs)
V10
(f s
Rock
Checks
Used
BMP
Associated w/
Buffer Rules?
4
-L-
23+00 TO 25+00
LT
35.67785
-80.85878
(2)Weathers Creek
0.0
6.0
4.0
0.36
36
200
0.42%
0.5
0.7
0.6
0.8
No
No
4
-L-
25+00 TO 27+00
LT
35.67880
-80.85906
(1)Rocky Creek (Youngs Creek)
0.0
6.0
4.0
0.93
93
200
1.17%
1.4
1.4
1.8
1.5
No
No
5
-L-
34+79 TO 35+50
LT
35.68082
-80.86022
(1)Rocky Creek (Youngs Creek)
0.0
6.0
5.0
0.10
10
71
0.80%
0.2
1.0
0.3
1.0
No
No
5
-L-
36+50 TO 38+18
LT
35.68165
-80.86076
(1)Rocky Creek (Youngs Creek)
0.0
3.0
3.0
0.17
17
168
1.18%
0.4
1.2
0.5
1.2
No
No
5
-L-
38+57 TO 39+61
LT
35.68200
-80.86097
(1)Rocky Creek (Youngs Creek)
0.0
6.0
1 6.0
0.26
1 26
104
1.55 %
1 0.5
1.2
1 0.7
1.3
1 No
No
4
-L-
23+50 TO 25+50
RT
35.67806
-80.85854
(2)Weathers Creek
0.0
6.0
6.0
0.50
50
200
0.48%
1.4
1.0
1.8
1.1
No
No
4&5
-L-
30+50 TO 33+50
RT
35.67990
-80.85929
(2)Weathers Creek
0.0
6.0
4.0
0.63
63
300
1.19%
1.3
1.9
1.3
1.9
No
No
5
-L-
35+00 TO 36+00
RT
35.68121
-80.86021
(1)Rocky Creek (Youngs Creek)
0.0
6.0
6.0
0.64
64
100
0.31 %
1.0
0.8
1.0
0.8
No
No
6
-Y2-
13+45 TO 16+50
LT
35.67551
-80.85947
(1)Rocky Creek (Youngs Creek)
0.0
3.0
3.0
0.37
37
305
2.17%
0.8
1.5
1.0
1.6
No
No
6
-Y2-
17+50 TO 18+00
LT
35.67672
-80.85951
(1)Rocky Creek (Youngs Creek)
0.0
3.0
3.0
0.33
33
50
2.40%
0.8
1.8
1.0
1.9
No
No
6
-Y2-
24+00 TO 25+00
LT
35.67826
-80.86034
(1)Rocky Creek (Youngs Creek)
0.0
3.0
3.0
0.10
10
100
3.36%
0.1
1.3
0.2
1.4
No
No
6
-Y2-
25+00 TO 26+50
LT
35.67895
-80.85998
(1)Rocky Creek (Youngs Creek)
0.0
3.0
3.0
0.14
14
150
2.14%
0.2
1.1
0.2
1.1
No
No
6
-Y2-
13+45 TO 14+50
RT
35.67550
-80.85928
(1)Rocky Creek (Youngs Creek)
0.0
3.0
3.0
0.17
17
105
2.79%
0.5
1.8
0.6
1 2.0
No
No
6
-Y2-
24+00 TO 25+00
RT
35.67825
-80.85999
(1)Rocky Creek (Youngs Creek)
0.0
3.0
3.0
0.27
27
100
0.77%
0.4
1.2
0.5
1.3
No
No
4&6
-Y2-
25+00 TO 27+00
RT
35.67896
-80.85971
(1)Rocky Creek (Youngs Creek)
0.0
3.0
3.0
0.90
90
200
2.00%
1.3
1.7
1.7
1.9
No
No
4
-Y3-
11+00 TO 11+50
LT
35.67972
-80.85898
(2)Weathers Creek
0.0
3.0
3.0
0.73
73
50
0.40%
1.3
1.1
1.7
1.1
No
No
Additional Comments
Swales with a 4:1 front slope and 2:1 back slope were assumed acceptable by averaging the two slopes, resulting in 3:1 side slopes. In these instances, 3:1 side slopes were input above.