20090745 Ver 1_Stormwater Info_20090701

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O WATER QUALITY
LAND DEVELOPMENT CONSULTANTS ! 4TTORMWATER9 y*4C{
09'0 745
STORMWATER MANAGEMENT
DESIGN CALCULATIONS
FOR
Rose of Sharon
March 13, 2009
Project #14007
PIN # 0813-01-46-6523
Prepared For:
Garden View Realty
Durham, NC
+»Tti $•? fir. ./ ?
?S
J???il7liiftttt?tiy
LAND PLANNERS + CIVIL ENGINEERS
TABLE OF CONTENTS
Splitter Boxes and Plunge Pools
Level Spreaders
11
Dry Pond Calculations and Routing 19
Splitter Boxes and Plunge Pools
Each of the three splitter boxes (Splitter A - which receives the flow from Pond #2; Splitter B
and Splitter C - which receive the flows from the B and C storm pipe systems, respectively and
flow to Level Spreaders #2 and #1, respectively) were modeled as a pond structures with a
primary orifice outlet controlling the 1"/hr storm intensity to the level spreaders. The "ponds"
also include a weir as an emergency spillway which directs the flows over the 1"/hr storm to the
plunge pools. In order to determine the flow directed to the plunge pools, the 10-yr flow, as
calculated from the storm drain piping analysis, is used as the Total Flow to the splitter. The
flow is broken down to what is going through the orifice to the level spreader and what overtops
the weir. This flow that overtops the weir was used to determine the sizing for the plunge pools.
Calculations on the Splitter Box designs and the associated Plunge Pools are attached.

Pond Report
Hydraflow Hydrographs by Intelisolve Friday, Oct 31 2008, 11:20 AM
- Flow Splitter A
Pond Data
Bottom LxW = 4.0 x 4.0 ft S ide slope = 0.0:1 Bottom elev. = 432.00 ft Depth = 4.00 ft
Stage / Storage Table
Stage (ft) Elevation (ft) Contour area (sqft) Incr. Storage (cult) Total storage (cuft)
0.00 432.00 16 0 0
0.20 432.20 16 3 3
0.40 432.40 16 3 6
0.60 432.60 16 3 10
0.80 432.80 16 3 13
1.00 433.00 16 3 16
1.20 433.20 16 3 19
1.40 433.40 16 3 22
1.60 433.60 16 3 26
1.80 433.80 16 3 29
2.00 434.00 16 3 32
2.20 434.20 16 3 35
2.40 434.40 16 3 38
2.60 434.60 16 3 42
2.80 434.80 16 3 45
3.00 435.00 16 3 48
3.20 435.20 16 3 51
3.40 435.40 16 3 54
3.60 435.60 16 3 58
3.80 435.80 16 3 61
4.00 436.00 16 3 64
Culvert / Orifice Structures Weir Structures
[A] [B] [C] [D] [A] [B] [C] [D]
Rise (in) = 8.00 0.00 0.00 0.00 Crest Len (ft) = 4.00 0.00 0.00 0.00
Span (in) = 8.00 0.00 0.00 0.00 Crest El. (ft) = 433.40 0.00 0.00 0.00
No. Barrels = 1 0 0 0 Weir Coeff. = 3.00 0.00 0.00 0.00
Invert El. (ft) = 432.60 0.00 0.00 0.00 Weir Type = Rect --- --- ---
Length (ft) = 10.00 0.00 0.00 0.00 Multi-Stage = No No No No
Slope (%) = 1.00 0.00 0.00 0.00
N-Value = .011 .000 .000 .000
Orif. Coeff. = 0.60 0.00 0.00 0.00
Multi-Stage = n/a No No No Exfiltration = 0.000 in/hr (Wet area) Tailwater Elev. = 433.00 ft
Note: Culvert/Orifice outflows have been analyzed under inlet and outlet control.
Stage / Storage / Discharge Table
Stage Storage Elevation Clv A Clv B Clv C Civ D Wr A Wr B Wr C Wr D Exfil Total
ft cuft ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs
0.00 0 432.00 0.00 --- --- --- 0.00 --- --- -- --- 0.00
0.20 3 432.20 0.00 --- --- --- 0.00 --- -- --- -- 0.00
0.40 6 432.40 0.00 -- --- --- 0.00 --- --- --- --- 0.00
0.60 10 432.60 0.00 --- --- --- 0.00 --- --- --- --- 0.00
0.80 13 432.80 0.00 --- --- --- 0.00 --- --- --- --- 0.00
1.00 16 433.00 0.00 --- -- --- 0.00 --- --- - --- 0.00
1.20 19 433.20 0.63 -- --- --- 0.00 --- -- -- --- 0.63
1.40 22 433.40 0.99 --- --- --- 0.00 --- --- --- --- 0.99
1.60 26 433.60 1.30 --- --- --- 1.07 --- --- -- --- 2.38
1.80 29 433.80 1.50 --- --- --- 3.04 --- --- --- --- 4.54
2.00 32 434.00 1.68 --- -- --- 5.58 --- --- --- --- 7.26
2.20 35 434.20 1.84 --- --- -- 8.59 --- --- -- --- 10.43
2.40 38 434.40 1.99 --- - --- 12.00 --- --- -- --- 13.99`--
2.60 4 434.60 2.13 --- -- --- 5.77 -- --- --- --- 17.90
2.80 45 434.80 2.25 --- -- -- 19.88 --- --- -- --- 22.13
3.00 48 435.00 2.38 --- --- --- 24.29 --- --- --- -- 26.66
3.20 51 435.20 2.49 -- -- --- 28.98 --- --- -- --- 31.47
3.40 54 435.40 2.60 -- --- --- 33.94 -- -- -- - 36.54
3.60 58 435.60 2.71 - --- --- 39.16 --- --- --- --- 41.87
3.80 61 435.80 2.81 --- --- - 44.62 -- -- --- -- 47.43
4.00 64 436.00 2.91 --- - --- 50.31 -- --- --- -- 53.22
_V?j e2
RIPRAP LINED PLUNGE POOL FOR CANTILEVER OUTLET (Version 8.99)
(Reference Design Note No. 6 (Second Edition), Jan. 23, 1986
JOB: Rose of Sharon - Pond 2
DESIGNER: Kenon Blackwood
CHECKER:
INPUT DATA:
Conduit Diameter
Conduit Discharge:
Conduit Slope at Outlet:
Conduit Outlet Invert Elevation:
Tailwater Elevation:
Outlet Channel Invert Elevation:
Date: ########
Date: Oct. 2008
D = 2.00 ft
Q = 13.85 cfs
S = 0.01 ft/ft
El, CO = 433.00 ft
El, TW = 432.25 ft
El, CH = 432.00 ft
Water Density: RHO = 1.00
Bed/Riprap Particle Density: (Default 2.64) RHOS = 2.64
D, 50 Riprap Size: RS = 0.50 ft
Riprap Thickness: (2.5*D, 50 recommended) RT = 1.25 ft
Bedding Thickness: (6 inch min. rec.) (_Enter 0 for geotextile) BT = 0.00 ft
Side Slope Ratio: Zw = 2.00 ft/ft
Upstream End Slope Ratio: Zlu = 3.00 ft/ft
Downstream End Slope Ratio: Zld = 3.00 ft/ft
Combined End Slope Ratio: Z1 = 3.00 ft/ft
OUTPUT---POOL LOCATION AND DIMENSIONS:
Vert. Dist. from Tailwater to Conduit Invert: Zp = 0.75 ft
Submergence Check: (If Zp < 0, Use Zp = 0) Use Zp = 0.75 ft
Beaching Check: [Q/(gD^5)^0.5 <= (1.0+25*D,50/D)] 0. K.
**Beaching Controlled**
Distance from Conduit Exit to C/L Pool: Xm = 2.45 ft
Pool depth at C/L Below Conduit Invert: Zp+0.8Zm = 2.34 ft
Pool Bottom Elev: EI,PB = 430.66 ft
Pool Bottom Length: 2Lr2 = 1.31 ft
Pool Bottom Width: 2Wr2 = 1.24 ft
Upstream Pool Length at Tailwater Elev.: Lru = 5.43 ft
Downstream Pool Length at Tailwater Elev.: Lrd = 5.43 ft
Pool Width at Tailwater Elev.: 2Wr = 7.61 ft
Check Side Slope Ratio: (Wr>=We) 0. K.
**Side Slope Ratio Zw O.K.**
Check Min. End Slope Ratio: (Lru & Lrd >= Le) 0. K.
**End Slope Ratios O.K.**
Check Upstream Length: (Lru >= Xm) 0. K.
**End Slope Ratio Zlu O.K.**
Pool Bottom Elev. at Bottom of Riprap: El, BR = 429.41 ft
Pool Bottom Elev. at Bottom of Bedding: El, BB = 429.41 ft
OUTPUT---VOLUMES BELOW WATER SURFACE ELEVATION:
Volume of Excavation (measured from bottom
surface of bedding): V,pbs = 9.8 cu yd
Volume of Rock Riprap: V,rs = 7.9 cu yd
Area of Geotextile: A,gt = 36.2 sq yd
Spreadsheet developed by D. Hurtz, Midwest NTC, 1/90
Spreadsheet modified by M. Dreischmeier, Eau Claire TC, Wis., 3/98
Design Note No. 6 (Second Edition), Jan. 23, 1986
%aP 3
RIPRAP LINED PLUNGE POOL FOR CANTILEVER OUTLET
Reference Design Note No. 6 (Second Edition), Jan. 23, 1986
EE lev. 433.0 Elev.
432.0
Elev.
2.3 430.7
1.3
1 1
3.0 3.0
1.7 --
F 2.5 -?
5.4 •'• 8.6 -
SECTION A-A
' 13.2
7.6
1.2 --• 1
1.3 2.0
t- 1.8-? SECTION B-B
B
A A
ROCK GRADATION
% Passing Size in B
100 12 Rose of Sharon - Pond 2
60-85 9 LANDOWNER
25-50 6
5-20 3 DESIGNER: Kenon Blac
0-5 1.2 SHEET OF
<wood
-Pcq e 4
Pond Report
Hydraflow Hydrographs by Intelisolve Friday, Oct 31 2008, 11:28 AM
- Flow Splitter B
Pond Data
Bottom LxW = 5.3 x 5.3 ft Side slope = 0.0:1 Bottom elev. = 447.40 ft Depth = 4.00 ft
Stage / Storage Table
Stage (ft) Elevation (ft) Contour area (sgft) Incr. Storage (cuft) Total storage (cuft)
0.00 447.40 28 0 0
0.20 447.60 28 6 6
0.40 447.80 28 6 11
0.60 448.00 28 6 17
0.80 448.20 28 6 23
1.00 448.40 28 6 28
1.20 448.60 28 6 34
1.40 448.80 28 6 40
1.60 449.00 28 6 45
1.80 449.20 28 6 51
2.00 449.40 28 6 57
2.20 449.60 28 6 62
2.40 449.80 28 6 68
2.60 450.00 28 6 74
2.80 450.20 28 6 80
3.00 450.40 28 6 85
3.20 450.60 28 6 91
3.40 450.80 28 6 97
3.60 451.00 28 6 102
3.80 451.20 28 6 108
4.00 451.40 28 6 114
Culvert / Orifice Structures Weir Structures
[A] [B] [C] [D] [A] [B] [C] [D]
Rise (in) = 8.00 0.00 0.00 0.00 Crest Len (ft) = 5.00 0.00 0.00 0.00
Span (in) = 8.00 0.00 0.00 0.00 Crest El. (ft) = 449.97 0.00 0.00 0.00
No. Barrels = 1 0 0 0 Weir Coeff. = 3.00 0.00 0.00 0.00
Invert El. (ft) = 447.30 0.00 0.00 0.00 Weir Type = Rect --- --- ---
Length (ft) = 30.00 0.00 0.00 0.00 Multi-Stage = No No No No
Slope (%) = 1.00 0.00 0.00 0.00
N-Value = .011 .000 .000 .000
Orif. Coeff. = 0.60 0.00 0.00 0.00
Multi-Stage = n/a No No No Exfiltration = 0.000 in/hr (Wet area) Tailwater Elev. = 447.50 ft
Note: Culvert/Orifice outflows have been analyzed under inlet and outlet control.
Stage / Storage / Discharge Table
Stage Storage Elevation Civ A Clv B Clv C Clv D Wr A Wr B Wr C Wr D ExfiI Total
ft cuft ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs
0.00 0 447.40 0.00 --- --- --- 0.00 -- -- --- --- 0.00
0.20 6 447.60 0.23 -- --- --- 0.00 --- --- --- --- 0.23
0.40 11 447.80 0.68 --- --- --- 0.00 -- -- --- --- 0.68
0.60 17 448.00 1.00 -- --- --- 0.00 -- --- --- --- 1.00
0.80 23 448.20 1.26 --- --- --- 0.00 -- --- --- --- 1.26
1.00 28 448.40 1.47 --- --- -- 0.00 --- --- --- -- 1.47
1.20 34 448.60 1.65 --- -- --- 0.00 --- --- -- - 1.65
1.40 40 448.80 1.82 --- -- --- 0.00 --- --- --- -- 1.82
1.60 45 449.00 1.96 -- --- -- 0.00 --- --- --- 1.96
1.80 51 449.20 2.10 -- --- - 0.00 --- --- --- -- 2.10
2.00 57 449.40 2.23 --- --- --- 0.00 --- --- --- --- 2.23
2.20 62 449.60 2.36 --- --- -- 0.00 --- --- --- --- 2.36
2.40 68 449.80 2.47 --- --- --- 0.00 --- --- --- --- 2.47
2.60 74 450.00 2.59 --- --- --- 0.08 -- --- --- --- 2.66
2.80 80 450.20 2.69 --- --- --- 1.65 -- --- --- --- 4.35
3.00 85 450.40 2.80 --- --- --- 4.23 --- --- --- --- 7.02
3.20 91 450.60 2.89 --- --- --- 7.50 -- --- --- --- 10.40
3.40 97 450.80 2.99 --- --- --- 11.34 --- --- --- --- 14.33
3.60 102 451.00 3.08 --- --- --- 15.68 -- --- --- --- 18.76 E
3.80 108 451.20 3.17 --- -- --- 20.46 --- -- --- --
4.00 114 451.40 3.26 - -- --- 25.65 --- --- --- -- 28.91
poe-je s
RIPRAP LINED PLUNGE POOL FOR CANTILEVER OUTLET (Version 8.99)
(Reference Design Note No. 6 (Second Edition), Jan. 23, 1986
--- --- - --------- --
JOB: Rose of Sharon - B01
DESIGNER: Kenon Blackwood Date: 3/12/2009
CHECKER: Date: Oct. 2008
INPUT DATA:
Conduit Diameter D= 2.00 ft
Conduit Discharge: Q= 15.68 cfs
Conduit Slope at Outlet: S= 0.03 ft/ft
Conduit Outlet Invert Elevation: El, CO = 446.50 ft
Tailwater Elevation: El, TW = 445.60 ft
Outlet Channel Invert Elevation: El, CH = 445.50 ft
Water Density: RHO = 1.00
Bed/Riprap Particle Density: (Default 2.64) RHOS = 2.64
D, 50 Riprap Size: RS = 0.50 ft
Riprap Thickness: (2.5*D, 50 recommended) RT = 1.25 ft
Bedding Thickness: (6 inch min. rec.) (Enter 0 for geotextile) BT = 0.00 ft
Side Slope Ratio: Zw = 2.00 ft/ft
Upstream End Slope Ratio: Zlu = 3.00 ft/ft
Downstream End Slope Ratio: Zld = 3.00 ft/ft
Combined End Slope Ratio: Z1 = 3.00 ft/ft
OUTPUT--POOL LOCATION AND DIMENSIONS:
Vert. Dist. from Tailwater to Conduit Invert: Zp = 0.90 ft
Submergence Check: (if Zp < 0, Use Zp = 0) Use Zp = 0.90 ft
Beaching Check: [Q/(gD^5)^0.5 <= (1.0+25*D,50/D)] O.K.
**Beaching Controlled**
Distance from Conduit Exit to C/L Pool: Xm = 3.22 ft
Pool depth at C/L Below Conduit Invert: Zp+0.8Zm = 3.24 ft
Pool Bottom Elev: EI,PB = 443.26 ft
Pool Bottom Length: 2Lr2 = 1.95 ft
Pool Bottom Width: 2Wr2 = 1.84 ft
Upstream Pool Length at Tailwater Elev.: Lru = 7.99 ft
Downstream Pool Length at Tailwater Elev.: Lrd = 7.99 ft
Pool Width at Tailwater Elev.: 2Wr = 11.20 ft
Check Side Slope Ratio: (Wr>=We) O.K.
**Side Slope Ratio Zw O.K.**
Check Min. End Slope Ratio: (Lru & Lrd >= Le) O.K.
**End Slope Ratios O.K.**
Check Upstream Length: (Lru >= Xm) O.K.
**End Slope Ratio Zlu O.K.**
Pool Bottom Elev. at Bottom of Riprap: El, BR = 442.01 ft
Pool Bottom Elev. at Bottom of Bedding: El, BB = 442.01 ft
OUTPUT---VOLUMES BELOW WATER SURFACE ELEVATION:
Volume of Excavation (measured from bottom
surface of bedding): V,pbs = 20.1 cu yd
Volume of Rock Riprap: V,rs = 14.1 cu yd
Area of Geotextile: A,gt = 57.0 sq yd
Spreadsheet developed by D. Hurtz, Midwest NTC, 1/90
Spreadsheet modified by M. Dreischmeier, Eau Claire TC, Wis., 3/98
Design Note No. 6 (Second Edition), Jan. 23, 1986
"Riprap Lined Plunge Pool for Cantilever Outlet'
Natural Resources Conservation Service
Engineering Division
_Pk,W, -2
RIPRAP LINED PLUNGE POOL FOR CANTILEVER OUTLET
Reference Design Note No. 6 (Second Edition), Jan. 23, 1986
Elev. 446.5 Elev.
445.5
Elev.
3.2 443.3
1.9
'1 1
3.0 3.0
2.4 -
f 3.2 -+
8.0 11.6
SECTION A-A
16.8
11.2
1.8 - 1
1.3 2.0
?--- 2.4-+ SECTION B-B
B
A A
ROCK GRADATION
% Passing Size (in) B
100 12 Rose of Sharon - B01
60-85 9 LANDOWNER
25-50 6
5-20 3 DESIGNER: Kenon Bla
0-5 1.2 SHEET OF
ckwood

Pond Report
Hydraflow Hydrographs by Intelisolve Friday, Oct 31 2008, 11:35 AM
- Flow Splitter C
Pond Data
Bottom LxW = 4.5 x 4.5 ft Side slope = 0.0:1 Bottom elev. = 429.40 ft Depth = 4.00 ft
Stage / Storage Table
Stage (ft) Elevation (ft) Contour area (sqft) Incr. Storage (cult) Total storage (cuft)
0.00 429.40 20 0 0
0.20 429.60 20 4 4
0.40 429.80 20 4 8
0.60 430.00 20 4 12
0.80 430.20 20 4 16
1.00 430.40 20 4 20
1.20 430.60 20 4 24
1.40 430.80 20 4 28
1.60 431.00 20 4 32
1.80 431.20 20 4 36
2.00 431.40 20 4 41
2.20 431.60 20 4 45
2.40 431.80 20 4 49
2.60 432.00 20 4 53
2.80 432.20 20 4 57
3.00 432.40 20 4 61
3.20 432.60 20 4 65
3.40 432.80 20 4 69
3.60 433.00 20 4 73
3.80 433.20 20 4 77
4.00 433.40 20 4 81
Culvert / Ori fice Structures Weir Structures
[A] [B] [C] [D] [A] II3l [C] [D]
Rise (in) = 6.00 0.00 0.00 0.00 Crest Len (ft) = 4.00 0.00 0.00 0.00
Span (in) = 6.00 0.00 0.00 0.00 Crest El. (ft) = 430.75 0.00 0.00 0.00
No. Barrels = 1 0 0 0 Weir Coeff. = 3.00 0.00 0.00 0.00
Invert El. (ft) = 429.40 0.00 0.00 0.00 Weir Type = Rect --- --- ---
Length (ft) = 20.00 0.00 0.00 0.00 Multi-Stage = No No No No
Slope (%) = 4.50 0.00 0.00 0.00
N-Value = .011 .000 .000 .000
Orif. Coeff. = 0.60 0.00 0.00 0.00
Multi-Stage = n/a No No No Exfiltration = 0 .000 in/hr (Wet area) Tailwater Elev. = 0.00 ft
Note: Culvert/Orifice outflows have been analyzed under inlet and outlet control.
Stage / Storage / Discharge Table
Stage Storage Elevation Clv A Clv B Clv C Clv D Wr A Wr B Wr C Wr D Exfil Total
ft cuft ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs
0.00 0 429.40 0.00 --- --- --- 0.00 --- --- --- --- 0.00
0.20 4 429.60 0.11 --- --- --- 0.00 --- --- --- --- 0.11
0.40 8 429.80 0.36 --- --- --- 0.00 --- --- --- --- 0.36
0.60 12 430.00 0.56 --- --- --- 0.00 --- --- --- --- 0.56
0.80 16 430.20 0.70 -- --- --- 0.00 --- --- --- --- 0.70
1.00 20 430.40 0.82 --- --- --- 0.00 --- -- --- --- 0.82
1.20 24 430.60 0.92 -- --- --- 0.00 --- -- --- --- 0.92
1.40 28 430.80 1.01 --- --- --- 0.13 --- --- --- -- 1.15
1.60 32 431.00 1.10 -- --- --- 1.50 - - --- -- 2.60
1.80 36 431.20 1.18 -- --- --- 3.62 -- --- --- -- 4.80
2.00 41 431.40 1.25 --- --- --- 6.29 -- - --- -- 7.544-
2.20 45 431.60 1.32 -- --- 9.40 _-_ 10.72
2.40 49 431.80 1.39 --- --- -- 12.91 --- 14.30
2.60 53 432.00 1.45 --- --- -- 16.77 --- --- -- --- 18.22
2.80 57 432.20 1.51 --- --- -- 20.95 --- -- --- - 22.46
3.00 61 432.40 1.57 --- --- -- 25.43 --- --- --- 27.00
3.20 65 432.60 1.62 - --- --- 30.20 --- -- --- --- 31.82
3.40 69 432.80 1.68 -- --- --- 35.22 --- --- --- --- 36.90
3.60 73 433.00 1.73 -- --- --- 40.50 --- --- --- --- 42.23
3.80 77 433.20 1.78 --- --- --- 46.02 --- -- --- -- 47.80
4.00 81 433.40 1.83 -- -- -- 51.77 --- --- -- -- 53.60
Pal e 8
RIPRAP LINED PLUNGE POOL FOR CANTILEVER OUTLET (Version 8.99)
(Reference Design Note No. 6 (Second Edition), Jan. 23, 1986
JOB: Rose of Sharon - C01
DESIGNER: Kenon Blackwood Date: 3/12/2009
CHECKER: Date: Oct. 2008
INPUT DATA:
Conduit Diameter D= 2.50 ft
Conduit Discharge: Q= 6.29 cfs
Conduit Slope at Outlet: S= 0.01 ft/ft
Conduit Outlet Invert Elevation: El, CO = 429.00 ft
Tailwater Elevation: El, TW = 428.45 ft
Outlet Channel Invert Elevation: El, CH = 428.20 ft

Water Density:
RHO = -_-_ ----
1.00
Bed/Riprap Particle Density: (Default 2.64) RHOS = 2.64
D, 50 Riprap Size: RS = 0.50 ft
Riprap Thickness: (2.5*D, 50 recommended) RT = 1.25 ft
Bedding Thickness: (6 inch min. rec.) (Enter 0 for geotextile) BT = 0.00 ft
Side Slope Ratio: Zw = 2.00 ft/ft
Upstream End Slope Ratio: Zlu = 3.00 ft/ft
Downstream End Slope Ratio: Zld = 3.00 ft/ft
Combined End Slope Ratio: Z1 = 3.00 ft/ft
OUTPUT---POOL LOCATION AND DIMENSIONS:
Vert. Dist. from Tailwater to Conduit Invert: Zp = 0.55 ft
Submergence Check: (If Zp < 0 , Use Zp = 0) Use Zp = 0.55 ft
Beaching Check: [Q/(gD^5)^0.5 <= (1.0+25*D,50/D)] O.K.
**Beaching Controlled**
Distance from Conduit Exit to C/L Pool: Xm = 0.65 ft
Pool depth at C/L Below Conduit Invert: Zp+0.8Zm = 1.51 ft
Pool Bottom Elev: EI,PB = 427.49 ft
Pool Bottom Length: 2Lr2 = 0.74 ft
Pool Bottom Width: 2Wr2 = 0.73 ft
Upstream Pool Length at Tailwater Elev.: Lru = 3.24 ft
Downstream Pool Length at Tailwater Elev.: Lrd = 3.24 ft
Pool Width at Tailwater Elev.: 2Wr = 4.56 ft
Check Side Slope Ratio: (Wr>=We) O.K.
**Side Slope Ratio Zw O.K.**
Check Min. End Slope Ratio: (Lru & Lrd >= Le) O.K.
**End Slope Ratios O.K.**
Check Upstream Length: (Lru >= Xm) O.K.
**End Slope Ratio Zlu O.K.**
Pool Bottom Elev. at Bottom of Riprap: El, BR = 426.24 ft
Pool Bottom Elev. at Bottom of Bedding: El, BB = 426.24 ft
OUTPUT---VOLUMES BELOW WATER SURFACE ELEVATION:
Volume of Excavation (measured from bottom
surface of bedding): V,pbs = 4.4 cu yd
Volume of Rock Riprap: V,rs = 4.0 cu yd
Area of Geotextile: A,gt = 22.5 sq yd
Spreadsheet developed by D. Hurtz, Midwest NTC, 1/90
Spreadsheet modified by M. Dreischmeier, Eau Claire TC, Wis., 3/98
Design Note No. 6 (Second Edition), Jan. 23, 1986
'Riprap Lined Plunge Pool for Cantilever Outlet'
Natural Resources Conservation Service
Engineering Division
Page-R
Pal, e 10
Level Spreaders
Level Spreaders were designed using DWQ methodologies with the exception being that the
bypass flows for three of the spreaders are directed by pipe into Plunge Pools which are located
outside of the stream buffers. The Level Spreader at Pond #1 receives the entire flow from the
10 year storm event and thus is not required to have a high flow bypass.
The Level Spreader at Pond #2 is receiving the flow from the BN1P (Dry Pond) and the design is
based on the routed discharge from the 1 year storm event (which is expected to be a larger flow
than the 1 in/hr intensity on the drainage area).
The Level Spreader #1 and Level Spreader 92 are receiving the runoff from the 1 in/hr intensity
over their drainage areas.
DWQ Level Spreader *worksheets are attached for each of these spreaders.
p0,? e, (k
AFA
NCDENR
Michael Fiocao
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This fort must be comple* filed out, printed and submitted
DO NOT FORGET TO ATTACH THE REQUIRED ITEMS CHECKLIST AND ALL REQUIRED ITEMS (NEXT WORKSHEET)!
Project name
Contact name
Phone number
Date
Drainage area number
Type of BMP
Drawdown now from the BMP
Flow From a BMP
For Level Spreaders Receiving Flow from the Drainage Area
Drainage area
Impervious surface area
Percent impervious
Monet C coefficient
Peak flow from the 1 lwilit storm
Time of concentration
Rainfall intensity, 10-yr storm
Peek flow from the 10-yr storm
Where Does the Level Spreader Discharge?
To a grassed bioretention cell?
To a mulched bioretention cell?
To a wetland?
To a filter strip or riparian buffer?
Other (specify)
Filter Strip or Riparian Buffer Characterization (if applicable)
Width of gross
Width of dense ground cover
Width of wooded vegetation
Total width
Elevation at downslope base of level lip
Elevation at top of bank of the receiving water
Slope (from level lip to to top of bank)
Are any draws present?
Level Spreader Design
Forebey surface area
Feet of level to needed per ds
Answer T to one of the following;
Length based on the 1 inlhr storm?
Length based on the 10-yr storm?
Length based on the Bill discharge rate?
Design flow
Is a bypass device provided?
919.490.1645
March 6, 2009
pond 1
dry detention pond
2.03 cis
fe
o?
cfs
min
inlfrr
cfs
OF W Arr9
m
o ?
Do not complete this section of the wcriksheet
Do not wrplete this section of the Krrksheet
Do not complete this section of the lwrfisheet
Do not complete -this section of the *,-*sheet
Do riot cofnip;ete this section of the luorksheet
Do not complete this section of the Aurksheet
Do not complete this section of the vv ksheet
Do not complete this section of the wo,ksheef
N (Y orN)
N (Y or N)
N (Y or N)
Y (Y or N) Ptease complete flier sing cheraererizction betoya.
flltsr a" outside of NRRB
30.00 ft
ft
It
30.00 R
461.00 Int l
460.50 heal
1.67 %
N (Y or N)
sq It
13 fucfs
N (Y or N)
Y (Y or N)
N (Y or N)
2.03 cfs
N (Y or N)
Form SW461-level Spreader, Filter Strip, Restored Riparian Burfer•Rev.5
OK
OK
No forebay is needed
A bypass d, ;Jce is not needed
Parts 1. and 11: Design Summary, page 1 of 3
pclin t I ?-
Length of the level lip 27.00 It VALUE!
Are level spreaders in series? N (Y or N)
Bypass Channel Design (if applicable)
Does the bypass discharge through a wetland?
Does the channel enter the stream at an sngle?
Dimensions of the channel (see diagram below):
M
B
W
y
Peale velocity in the channel during the 10-yr storm
Channel lining material
(Y or N) Do not oarnplete this section of the worksheet
(Y or N) Do not complete this section of the vc ksheet
Do not complete this section of the am?ksheet
ft Do not cory>iete this section of the worksheet
Do not complete this section of fhs ntksheet
R Do not complete this section of the v-nxksheet
Do not complete this section of the worksheet
Cfs Do not complete ibis section of the aver sheet
Do not complete this section of the worksheet

M
Y
i B i
Form SW401-Level Spreader, Finer Strip, Restored Riparian Buffer•Rw.5
M
Parts I, and Ii. Design Summary, page 2 of 3
Pale- +3
Ill -
Please indicate the page or plan sheet numbers where the supporting documentation can be found. M incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
requirement has not been met, attach justification.
Pagel Plan
Initials Sheet No.
WCM C3a and C3b 1. Plans (1' - 50' or larger) of the entire site showing:
- Design at ultimate build-out,
- Off-site drainage Cd applicable),
- Delineated drainage basins (include Rational C coefficient per basin),
- Forebay (if applicable),
- High flow bypass system,
- Maintenance access,
- Proposed drainage easement and public right of way (ROW), and
- Boundaries of drainage easement.
WCM C7 2. Plan details (1' = 30' or larger) for the level spreader showing:
- Forebay (if applicable),
- High flow bypass system,
- One foot topo lines between the level lip and top of stream bank,
- Proposed drainage easement, and
- Design at ultimate build-out
WCM C7 3. Section view of the level spreader (1' = 20' or larger) showing:
- Underdrain system (if applicable),
- Level lip,
- Upslope channel, and
- Dow dope filter fabric.
NA; New Gras: 4. A date-stamped photograph of the filter strip that clearly shows the type of vegetation that is present.
WCM EC1 a 5. A construction sequence that shows how the level spreader will be protected from sediment until the entire
drainage area is stabilized.
WCM SWM Report 6. The supporting calculations.
MAF 7. A copy of the signed and notarized operation and maintenance (0&M) agreement.
NA 8. A copy of the deed restrictions (if required).
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5
Part III, page 1 of 1
rL,
f?i
AFA
NccENrt
dry detention pond
0.96 cfs
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be completely Ned out; printed and submitted,
DO NOT FORGET TO ATTACH THE REQUIRED ITEMS CHECKLIST AND ALL REQUIRED ITEMS (NEXT WORKSHEET)!

Project name Rose of Sharon
Contact name Wdiael Fiocoo
Phone number 919.4901645
Date March 6, 2009
Drainage area number pond 2
Type of BMP
Drawdown flow from the BMP
For Level Spreaders Receiving Flow from the Drainage Area
Drainage area
Impervious surface area
Percent impervious
Rational C coefficient
Peak flow from the 1 in/hr storm
Time of concentration
Rainfall intensity, l0-yr storm
Peak flow from the 10-yr stem
Where Does the Level Spreader Discharge?
To a grassed bioretention cell?
To a mulched bioretention cell?
To a wetland?
To a filter strip or riparian buffer?
Other (specify)
Filter Strip or Riparian Buffer Characterization (if applicable)
Width of grass
Width of dense ground cover
Width of wooded vegetation
Total width
Elevation at downstope base of level lip
Elevation at top of bank of the receiving water
Slope (from level lip to to top of bank)
Are any draws present?
Level Spreader Design
Foreboy surface area
Feet of level lip needed per efs
Answer `Y" to one of the following;
Length based on the 1 inlhr storm?
Length based on the 10-yr storm?
Length based on the BMP discharge rate?
Design flow
Is a bypass device provided?
fe
fe
96
cis
min
inlhr
cfs
?p? F \N ATFq pG
}
O
Do riot ccarplete this section of the a rksheet
Do not cr.:mrpMe thts section of the mclksheet
Do not complete this section of the worksheet
Do not complete this secion of the worksheet
Do not complete this section of the vvAsheet
Do not aarnpiete this section of the worksheet
Do not cr7 fete this section of the ;. ksheet
Do riot complete this section of the ?.x rksheet
N (Y orN)
N (Y or N)
N (Y or N)
Y (Y or N) please co nplete filter strip chary se^zahon be; v
filter strip outside of Durham *arm buffer and NRRB
30.00 R
R
it
30.00 it
432.50 frost
431.50 frost
3.33 % OK
N (Y or N) OK
sq It No forebay is needed
13 1Ncfs
N (Y or N)
N (Y or N)
Y (Y or N)
0.96 cis
Y (Y or N) OK
Form SW401-Level Spresder, Filter Strip, Restored Riparian Bufrsr-Rev.5 Parts 1. and 11. Design Summary, P" 1 Of 3
Pale I ?
Length of the level lip 27.00 ft #va,L.UF'
ke level spreaders in series? N (Y or N)
Bypass Channel Design (If applicable)
Dees the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Dimensions of the channel (see diagram below):
M
8
W
Y
Peak velocity in the channel during the 10 yr storm
Channel lining material
N (Y or N)
Y (Y or N)
ft
ft
ft
ft
WA erg
Sipe to stons4 nod plunge poo

1 ?. _.__.__7
M
Y
i 13 i
1
M
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer•Rev.5 Parts I. and II. Design Summary, page 2 or 3
p"e i s
a? $t?t s w
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
requirement has not been met, attach jusbfication.
Pagel Plan
Initials Sheet No.
WCM C3a and C3b 1. Plans (1" - 50' or larger) of the entire site showing:
- Design at ultimate build-out,
- Off-site drainage (if applicable),
- Delineated drainage basins (include Rational C coefficient per basin),
- Forebay (if applicable),
- High flow bypass system,
- Maintenance access,
- Proposed drainage easement and public right of way (ROW), and
- Boundaries of drainage easement.
WCM C7 2. Plan details (1 ° = 30' or larger) for the level spreader showing:
- Forebay (if applicable),
- High flow bypass system,
- One foot topo fines between the level lip and top of stream bank,
- Proposed drainage easement, and
- Design at ultimate build-out.
WCM C7 3. Section view of the level spreader (1' = 20' or larger) showing:
- Underdrain system (if applicable),
- Level 10,
- Upslope channel, and
- Downslope fitter fabric.
NA; New Gras: 4. A date-stamped photograph of the filter strip that clearly shows the type of vegetation that is present.
WCM EC1a 5. A construction sequence that shows how the level spreader will be protected from sediment until the entire
drainage area is stabilized.
WCM SWM Report 6. The supporting calculations.
MAF 7. A copy of the signed and notarized operation and maintenance (0&M) agreement.
NA 8. A copy of the deed restrictions (if required).
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5 Part III, page 1 of 1
tGA
`O
5?? a0F 'NAT?9
l?
O ?
HMNR
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be completely Nied out, printed and submitted.
DO NOT FORGET TO ATTACH THE REQUIRED ITEMS CHECKLIST AND ALL REQUIRED ITEMS (NEXT WORKSHEET)l
Project name
Contact name
Phone number
Date
Drainage area number
Type of BMP
Drawdown flow from the 8MP
For Level Spreaders Receiving Flow from the Drainage Area
Drainage area
Impervious surface area
Percent Impervious
Rationale C coefficient
Peak flow from the 1 inihr storm
Time of concentration
Rainfall intensity, 10-yr stem
Peak Ilow from the 10-yr storm
Where Don the Level Spraidir Discharp?
To a grassed bioretention cell?
To a mulched bioretention cell?
To a wetland?
To a filter amp or riparian buffer?
Other (speciy)
Filter Strip or Riparian Buffer Characterization (If applicable)
Width of grans
Width of dense ground cover
Width of wooded vegetation
Total width
Elevation at downslope base of level lip
Elevation at top of bank of the receiving water
Slope (from level lip to to top of bank)
Are any draws present?
Level Spreader Design
Forebey surface area
Feet of level lip needed per cis
Answer "Y" to one of the following:
Length based on the 1 inlhr storm?
Length based on the 10-yr storm?
Length based on the BMP discharge rate?
Design flow
Is a bypass device provided?
clsl
270,500.00 f
143,312.00 ?t'
52.98 %
0.30
1.88 cfs
13.00 min
s .2 lnihr
9.69 cia
(Y or N)
(Y or N)
(Y or N)
Y (Y or N) Please m7Tplete filter stnp a era;herizeflun be:ovv
filter"outside of Durham stream buffer and NRRB
30.00 it
It
tt
30.00 ft
428.50 fmal
428.20 fmsl
1.00 %
N (Y or N)
273.00 eq It
13 Riefs
Y (Y or N)
N (Y or N)
N (Y or N)
1.86 cfs
Y (Y or N)
OK
OK
OK
OK
Form SW401d.evel Spreader, Fitter Strip, Restored Riparian Buffer-Rev. 5 Parts I. and It. Design Summary, page 1 of 2
P" e, I
Rose of Sharon
Michael Fiocco
Length of the level lip
Are level spreaders in series?
Bypass Channel Design (N applicable)
Doan the bypass discharge through a wetland?
Does the channel enter the stream at on ogle?
Dimensions of the channel (see diagram below):
M
a
W
Y
Peak velocity in the channel during the 10•yr storm
Channel lining material
25,00 it Lcvei sprea&i length OK
N (Y or N)
N (Y or N)
Y (Y or N)
ft
ft
ft
R
WA Cfs
pipe to stmw Ined plunge poo

1 i__ -----
M
Y
/ I 1
M
Form SW401-Level Spreader, Fitter Strip, Restored Riparian Buffer-Rev.5 Parts I. and II. Design Summary, page 2 or 2
_?n? c `?
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
requiremaild has not been met, attach justification.
Pagel Plan
Initials Sheet No.
WCM We and C3b 1. Plans (1" - 50' or larger) of the entire site showing:
- Design at ultimate build-out,
- Off-site drainage (d applicable),
- Delineated drainage basins (include Rational C coefficient per basin),
- Forebay (if applicable),
- High flow bypass system,
- Maintenance access,
- Proposed drainage easement and public right of way (ROW), and
- Boundaries of drainage easement.
WCM C7 2. Plan details (1" = 30' or larger) for the level spreader showing:
- Forebay (if applicable),
- High flow bypass system,
- One foot topo lines between the level lip and top of stream bank,
- Proposed drainage easement, and
- Design at ultimate build-out
WCM C7 3. Section view of the level spreader (1" = 20' or larger) showing:
- Underdrain system ('If applicable),
- Level lip,
- Upslope channel, and
- Downslope filter fabric.
NA;New Grass 4. A date-stamped photograph of the filter strip that dearly shows the type of vegetation that is present.
WCM EC1a 5. A construction sequence that shows how the level spreader will be protected from sediment until the entire
drainage area is stabilized.
WCM SWM Report 6. The supporting calculations.
MAF 7. A copy of the signed and notarized operation and maintenance (0&M) agreement.
NA 8. A copy of the deed restrictions (if required).
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev-5
Part III, pegs 1 of 1
Itl k
AWA
H=NR
Oa0F YJ A?7f0
0
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be completely }fled out, printed and submitted.
DO NOT FORGET TO ATTACH THE REQUIRED ITEMS CHECKLIST AND ALL REQUIRED ITEMS (NEXT WORKSHEET)!
I. PROJECT INFORMATION
Project name Rose of Sharon
Contact name Michael F'ioceo
Phone number 919490-1645
Deft March 6, 2009
Drainage area number Level Spreader a2
Receiving Flow From a BMP
Type of BMP
Drowdown flow Thom the BMP
For Level Spreaders Receiving Flow from the Drainage Ara
Drainage area
Impervious surface area
Percent impervious
Rational C coefficient
Peek flow from the 1 IrAr storm
Time of concentration
Rainfall intensity,10-yr storm
Peak flow from the 10-yr storm
Where Does the Level Spreader Dischrrrgo?
To a grassed biorstention cell?
To a mulched bkiretention cell?
To a wetland?
To a tiftelr strip or riparian buffer?
Other (spacifY)
Filter Strip or Riparian Buffer Characterization (If applicable)
Width of grass
Width of dense ground cover
Width of wooded vegetation
Total width
Elevation at downslope base of level lip
Elevation at top of bank of the receiving water
Slope (from level lip to to top of bank)
Are any draws present?
Level Spreader Design
Forebey surface area
Feet of level lip needed per cis
Answer "r to one of the following:
Length based on the 1 in/hr storm?
Length based on the 10-yr storm?
Length based on the BMP discharge rate?
Design flow
Is a bypass device provided?
ch
219,978.00 fe
39,204.00 fe
17.82 %
0.30
1.52 cfs
12.00 min
5.2 in/hr
7.88 cfs
(Y or N)
(Y or N)
(Y or N)
Y (Y or N) Please campPete fiPter strip cttaraeteizat on beiow
filter strip outsids of Durham stream buffer and NRRB
30.00 ft
It
It
30.00 ft
447.00 fmsl
445.20 imsl
6.00 %
N (Y or N) OK
982.00 sq ft OK.
13 ftlcis
Y (Y or N)
N (Y or N)
N (Y or N)
1.52 cfs
Y (Y or N) OK
Form SW401-Bevel Spreader, Filter Strip, Restored Riparian Surter-Rev.5 farts 1. and It. Design Summary, page 1 or 2
Pney l 3
Length of the level lip
Are level spreaders in series?
Bypass Channel Design (If applicable)
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Dimensions of the channel (see diagram below):
M
B
W
Y
Peak velocity in the channel during the 10 yr seam
Channel lining material
50.00 ft Level spreader length OK.
N (Y or N)
N (Y or N)
Y (Y or N)
It
it
tt
R
WA do
30e to stone-lined plunge poo
1 i• -° - Y
M
i B i
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5
- t
M
Parts I. and ll. Design Summary, page 2 of 2
P, (I) e. I q
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. N a
requirement has not been met, attach justification.
Pagel Plan
Initials Sheet No.
WCM C3a and C3b 1. Plans (1" - 50' or larger) of the entire site showing:
- Design at ultimate build-out,
- Off-site drainage Cd applicable),
- Delineated drainage basins (include Rational C coefficient per basin),
- Forebay (if applicable),
- High flow bypass system,
- Maintenance access,
- Proposed drainage easement and public right of way (ROW), and
- Boundaries of drainage easement
WCM C7 2. Plan details (1" = 30' or larger) for the level spreader showing:
- Forebay (if applicable),
- High flow bypass system,
- One foot topo lines between the level lip and top of stream bank,
- Proposed drainage easement, and
- Design at ultimate build-out
WCM C7 3. Section view of the level spreader (1" = 20' or larger) showing:
- Underdrain system (if applicable),
- Level lip,
- Upslope channel, and
- Downslope fitter fabric.
NA; New Gras: 4. A date-stamped photograph of the filter strip that dearly shows the type of vegetation that is present.
WCM EC1 a 5. A construction sequence that shows how the level spreader will be protected from sediment until the entire
drainage area is stabilized.
WCM SWM Report 6_ The supporting calculations.
MAF 7. A copy of the signed and notarized operation and maintenance (0&M) agreement.
NA 8. A copy of the deed restrictions (if required).
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5
Part III, page 1 of 1
11A
Dry Pond Calculations and Routing
The detention pond calculations are primarily contained the Stormwater Management Analysis,
last revised June 25, 2008, and included in the submittal package. Additional design calculations
for riser/barrel anti-floatation at each pond, as prescribed in the Reference Guide, are attached.
Design Summaries for each pond are also included in the submittal package.
Pa? e. ?9
JOB
SHEET NO. ? OF -
CIVIL CONSULTANTS, INC.
3708 Lyckan Parkway suite 201 CALCULATED BY 11JC b1 '? DATE
DURHAM, NC 27707 DATE
[phone] CHECKED BY
Fax [phone] SCALE
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JOB?'?
CIVIL CONSULTANTS, INC. SHEET NO. 4- OF
3708 Lyckan Parkway Suite 201 CALCULATED BY WG DATE 3A'491
DURHAM, NC 27707
[phone] CHECKED BY DATE
Fax [phone] SCALE a
S.
T. 3io( '
I 70 tee.
7/1
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JOB.
CIVIL CONSULTANTS, INC. SHEET NO.
?--
3708 Lyckan Parkway Suite 201 CALCULATED BY DATE Z& ??? q
DURHAM, NC 27707
[phone] CHECKED BY DATE
Fax [phone]+]
crnc
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JOB?I J?IG(Yt1 ,\ (AmT! - ?IdGT? )1 ?'?1
CIVIL CONSULTANTS, INC. SHEET NO. ' OF
3708 Lyckan Parkway Suite 201 CALCULATED BY w?ilnv- DATE
DURHAM, NC 27707
[phone] CHECKED BY DATE
Fax [phone] . 1
SCALE .r3.•
L fir; r 1o It ?,1,,1/ -f+ W?
5Q =il J
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tool d
Rile, 2,3
Permit Number:
(to be provided by DWQ)
Drainage Area Number:
Filter Strip, Restored Riparian Buffer and Level Spreader
Operation and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
Important maintenance procedures:
- Immediately after the filter strip is established, any newly planted vegetation
will be watered twice weekly if needed until the plants become established
(commonly six weeks).
- Once a year, the filter strip will be reseeded to maintain a dense growth of
vegetation
- Stable groundcover will be maintained in the drainage area to reduce the
sediment load to the vegetation.
- Two to three times a year, grass filter strips will be mowed and the clippings
harvested to promote the growth of thick vegetation with optimum pollutant
removal efficiency. Turf grass should not be cut shorter than 3 to 5 inches and
may be allowed to grow as tall as 12 inches depending on aesthetic requirements
(NIPC,1993). Forested filter strips do not require this type of maintenance.
- Once a year, the soil will be aerated if necessary.
- Once a year, soil pH will be tested and lime will be added if necessary.
After the filter strip is established, it will be inspected quarterly and within 24 hours
after every storm event greater than 1.0 inch (or 1.5 inches if in a Coastal County).
Records of operation and maintenance will be kept in a known set location and will be
available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element: Potential problem: How I will remediate the problem:
The entire filter strip Trash/debris is present. Remove the trash/debris.
system
The flow splitter device The flow splitter device is Unclog the conveyance and dispose
(if applicable) clogged. of an sediment off-site.
The flow splitter device is Make any necessary repairs or
damaged. replace if damage is too large for
repair.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 1 of 3
BMP element: Potential problem: How I will remediate the problem:
The swale and the level The swale is clogged with Remove the sediment and dispose
lip sediment. of it off-site.
The level lip is cracked, Repair or replace lip.
settled, undercut, eroded or
otherwise damaged.
There is erosion around the Regrade the soil to create a berm
end of the level spreader that that is higher than the level lip, and
shows stormwater has then plant a ground cover and
bypassed it. water until it is established. Provide
lime and a one-time fertilizer
application.
Trees or shrubs have begun Remove them.
to grow on the swale or just
downslo e of the level lip.
The bypass channel Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then
reestablish proper erosion control.
Turf reinforcement is Study the site to see if a larger
damaged or ripap is rolling bypass channel is needed (enlarge if
downhill. necessary). After this, reestablish
the erosion control material.
The filter strip Grass is too short or too long Maintain grass at a height of
if applicable). approximately three to six inches.
Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then plant a
ground cover and water until it is
established. Provide lime and a
one-time fertilizer application.
Sediment is building up on Remove the sediment and
the filter strip. restabilize the soil with vegetation if
necessary. Provide lime and a one-
time fertilizer application.
Plants are desiccated. Provide additional irrigation and
fertilizer as needed.
Plants are dead, diseased or Determine the source of the
dying. problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide a one-time
fertilizer application.
Nuisance vegetation is Remove vegetation by hand if
choking out desirable species. possible. If pesticide is used, do not
allow it to get into the receiving
water.
The receiving water Erosion or other signs of Contact the NC Division of Water
damage have occurred at the Quality local Regional Office, or the
outlet. 401 Oversight Unit at 919-733-1786.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 2 of 3
Permit Number:
(to be provided by DWQ)
I acknowledge and agree by my signature below that I am responsible for the
performance of the maintenance procedures listed above. I agree to notify DWQ of any
problems with the system or prior to any changes to the system or responsible party.
Project name:Rose of Sharon
BMP drainage area number:SWM Detention Pond 2
Print name:Susan Fox Beischer
Title:Land Owner
Address:2726 Croasdaile Drive Durham NC 27705
Phone:[phone]
Signature: 1d.//G'?? -(
???(? '
Date:
Note: The legally responsible party should not be a homeowners association unless more than 50% of
the lots have been sold and a resident of the subdivision has been named the president.
1, / 0.?),--?- , a Notary Public for the State of
g2J-.M a4l'ag County of 012,1„I? , do hereby certify that
C6tt--'4.) fox Ze<. deA personally appeared before me this
day of `emu ,uc , ADO 9 , and acknowledge the due execution of the
forgoing filter strip, riparian buffer, and/or level spreader maintenance requirements.
Witness my hand and official seal,
••..........
:' ••• P Rr ••.••.
Otgry
Public
SEAL
My commission expires Akeg# ao
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 3 of 3
Permit Number:
(to be provided by DWQ)
Drainage Area Number:
Filter Strip, Restored Riparian Buffer and Level Spreader
Operation and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
Important maintenance procedures:
- Immediately after the filter strip is established, any newly planted vegetation
will be watered twice weekly if needed until the plants become established
(commonly six weeks).
- Once a year, the filter strip will be reseeded to maintain a dense growth of
vegetation
- Stable groundcover will be maintained in the drainage area to reduce the
sediment load to the vegetation.
- Two to three times a year, grass filter strips will be mowed and the clippings
harvested to promote the growth of thick vegetation with optimum pollutant
removal efficiency. Turf grass should not be cut shorter than 3 to 5 inches and
may be allowed to grow as tall as 12 inches depending on aesthetic requirements
(NIPC,1993). Forested filter strips do not require this type of maintenance.
- Once a year, the soil will be aerated if necessary.
- Once a year, soil pH will be tested and lime will be added if necessary.
After the filter strip is established, it will be inspected quarterly and within 24 hours
after every storm event greater than 1.0 inch (or 1.5 inches if in a Coastal County).
Records of operation and maintenance will be kept in a known set location and will be
available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element: Potential problem: How I will remediate the problem:
The entire filter strip Trash/debris is present. Remove the trash/debris.
system
The flow splitter device The flow splitter device is Unclog the conveyance and dispose
(if applicable) clogged. of an sediment off-site.
The flow splitter device is Make any necessary repairs or
damaged. replace if damage is too large for
repair.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 1 of 3
BMP element: Potential problem: How I will remediate the problem:
The swale and the level The swale is clogged with Remove the sediment and dispose
lip sediment. of it off-site.
The level lip is cracked, Repair or replace lip.
settled, undercut, eroded or
otherwise damaged.
There is erosion around the Regrade the soil to create a berm
end of the level spreader that that is higher than the level lip, and
shows stormwater has then plant a ground cover and
bypassed it. water until it is established. Provide
lime and a one-time fertilizer
application.
Trees or shrubs have begun Remove them.
to grow on the swale or just
downslo e of the level lip.
The bypass channel Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then
reestablish proper erosion control.
Turf reinforcement is Study the site to see if a larger
damaged or ripap is rolling bypass channel is needed (enlarge if
downhill. necessary). After this, reestablish
the erosion control material.
The filter strip Grass is too short or too long Maintain grass at a height of
if applicable). approximately three to six inches.
Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then plant a
ground cover and water until it is
established. Provide lime and a
one-time fertilizer application.
Sediment is building up on Remove the sediment and
the filter strip. restabilize the soil with vegetation if
necessary. Provide lime and a one-
time fertilizer application.
Plants are desiccated. Provide additional irrigation and
fertilizer as needed.
Plants are dead, diseased or Determine the source of the
dying. problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide a one-time
fertilizer application.
Nuisance vegetation is Remove vegetation by hand if
choking out desirable species. possible. If pesticide is used, do not
allow it to get into the receiving
water.
The receiving water Erosion or other signs of Contact the NC Division of Water
damage have occurred at the Quality local Regional Office, or the
outlet. 401 Oversight Unit at 919-733-1786.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 2 of 3
Permit Number:
(to be provided by DWQ)
I acknowledge and agree by my signature below that I am responsible for the
performance of the maintenance procedures listed above. I agree to notify DWQ of any
problems with the system or prior to any changes to the system or responsible party.
Project name:Rose of Sharon
BMP drainage area number:SWM Detention Pond 1
Print name:Susan Fox Beischer
Title:Land Owner
Address:2726 Croasdaile Drive Durham NC 27705
Phone:[phone]
/ .-I In a 4 .
Signature:
Date:
Note: The legally responsible party should not be a homeowners association unless more than 50% of
the lots have been sold and a resident of the subdivision has been named the president.
I, -) rY? /t47-,K ,-.;5 , a Notary Public for the State of
2102071 6941 ?NA , County of Ah/J ? e , do hereby certify that
I5 ?-axi'S ?i e`2 personally appeared before me this -?9
day of _J aNe aDO , and acknowledge the due execution of the
forgoing filter strip, riparian buffer, and/or level spreader maintenance requirements.
Witness my hand and official seal,
%
Notary •
e° •
. e
•
Public
s
• AIL
SEAL
My commission expires_ 2)z&a aD //
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 3 of 3
Permit Number:
(to be provided by DWQ)
Drainage Area Number:
Filter Strip, Restored Riparian Buffer and Level Spreader
Operation and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
Important maintenance procedures:
- Immediately after the filter strip is established, any newly planted vegetation
will be watered twice weekly if needed until the plants become established
(commonly six weeks).
- Once a year, the filter strip will be reseeded to maintain a dense growth of
vegetation
- Stable groundcover will be maintained in the drainage area to reduce the
sediment load to the vegetation.
- Two to three times a year, grass filter strips will be mowed and the clippings
harvested to promote the growth of thick vegetation with optimum pollutant
removal efficiency. Turf grass should not be cut shorter than 3 to 5 inches and
may be allowed to grow as tall as 12 inches depending on aesthetic requirements
(NIPC,1993). Forested filter strips do not require this type of maintenance.
- Once a year, the soil will be aerated if necessary.
- Once a year, soil pH will be tested and lime will be added if necessary.
After the filter strip is established, it will be inspected quarterly and within 24 hours
after every storm event greater than 1.0 inch (or 1.5 inches if in a Coastal County).
Records of operation and maintenance will be kept in a known set location and will be
available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element: Potential problem: How I will remediate the problem:
The entire filter strip Trash/ debris is present. Remove the trash/ debris.
system
The flow splitter device The flow splitter device is Unclog the conveyance and dispose
(if applicable) clogged. of an sediment off-site.
The flow splitter device is Make any necessary repairs or
damaged. replace if damage is too large for
repair.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 1 of 3
BMP element: Potential problem: How I will remediate the problem:
The swale and the level The swale is clogged with Remove the sediment and dispose
lip sediment. of it off-site.
The level lip is cracked, Repair or replace lip.
settled, undercut, eroded or
otherwise damaged.
There is erosion around the Regrade the soil to create a berm
end of the level spreader that that is higher than the level lip, and
shows stormwater has then plant a ground cover and
bypassed it. water until it is established. Provide
lime and a one-time fertilizer
application.
Trees or shrubs have begun Remove them.
to grow on the swale or just
downslo e of the level lip.
The bypass channel Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then
reestablish proper erosion control.
Turf reinforcement is Study the site to see if a larger
damaged or ripap is rolling bypass channel is needed (enlarge if
downhill. necessary). After this, reestablish
the erosion control material.
The filter strip Grass is too short or too long Maintain grass at a height of
if applicable). approximately three to six inches.
Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then plant a
ground cover and water until it is
established. Provide lime and a
one-time fertilizer application.
Sediment is building up on Remove the sediment and
the filter strip. restabilize the soil with vegetation if
necessary. Provide lime and a one-
time fertilizer application.
Plants are desiccated. Provide additional irrigation and
fertilizer as needed.
Plants are dead, diseased or Determine the source of the
dying. problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide a one-time
fertilizer application.
Nuisance vegetation is Remove vegetation by hand if
choking out desirable species. possible. If pesticide is used, do not
allow it to get into the receiving
water.
The receiving water Erosion or other signs of Contact the NC Division of Water
damage have occurred at the Quality local Regional Office, or the
outlet. 401 Oversight Unit at 919-733-1786.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 2 of 3
Permit Number:
(to be provided by DWQ)
I acknowledge and agree by my signature below that I am responsible for the
performance of the maintenance procedures listed above. I agree to notify DWQ of any
problems with the system or prior to any changes to the system or responsible party.
Project name:Rose of Sharon
BMP drainage area number:Level Spreader 2
Print name:Susan Fox Beischer
Title:Land Owner
Address:2726 Croasdaile Drive Durham NC 27705
Phon
Signz
Date:
Note: The legally responsible party should not be a homeowners association unless more than 50% of
the lots have been sold and a resident of the subdivision has been named the president.
I, c'J?4i2o.J -11b a Notary Public for the State of
County of 0i&-wjr , do hereby certify that
c;?Z54-iJ 1"DA personally appeared before me this..494A
day of .,emu-adr ;;goo , and acknowledge the due execution of the
forgoing filter strip, riparian buffer, and/or level spreader maintenance requirements.
Witness my hand and official seal,
•e•e•u°eeeeee -
° °®o Up Ur
N%6 I
NOtW7
•
•
•
Public
e ?
o ?
e• ^ ? s
SEAL
My commission expires dJdAw
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 3 of 3
Permit Number:
(to be provided by DWQ)
Drainage Area Number:
Filter Strip, Restored Riparian Buffer and Level Spreader
Operation and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
Important maintenance procedures:
- Immediately after the filter strip is established, any newly planted vegetation
will be watered twice weekly if needed until the plants become established
(commonly six weeks).
- Once a year, the filter strip will be reseeded to maintain a dense growth of
vegetation
- Stable groundcover will be maintained in the drainage area to reduce the
sediment load to the vegetation.
- Two to three times a year, grass filter strips will be mowed and the clippings
harvested to promote the growth of thick vegetation with optimum pollutant
removal efficiency. Turf grass should not be cut shorter than 3 to 5 inches and
may be allowed to grow as tall as 12 inches depending on aesthetic requirements
(NIPC,1993). Forested filter strips do not require this type of maintenance.
- Once a year, the soil will be aerated if necessary.
- Once a year, soil pH will be tested and lime will be added if necessary.
After the filter strip is established, it will be inspected quarterly and within 24 hours
after every storm event greater than 1.0 inch (or 1.5 inches if in a Coastal County).
Records of operation and maintenance will be kept in a known set location and will be
available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element: Potential problem: How I will remediate the problem:
The entire filter strip Trash/ debris is present. Remove the trash/debris.
system
The flow splitter device The flow splitter device is Unclog the conveyance and dispose
(if applicable) clogged. of an sediment off-site.
The flow splitter device is Make any necessary repairs or
damaged. replace if damage is too large for
repair.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 1 of 3
BMP element: Potential problem: How I will remediate the problem:
The Swale and the level The swale is clogged with Remove the sediment and dispose
lip sediment. of it off-site.
The level lip is cracked, Repair or replace lip.
settled, undercut, eroded or
otherwise damaged.
There is erosion around the Regrade the soil to create a berm
end of the level spreader that that is higher than the level lip, and
shows stormwater has then plant a ground cover and
bypassed it. water until it is established. Provide
lime and a one-time fertilizer
application.
Trees or shrubs have begun Remove them.
to grow on the swale or just
downslo e of the level lip.
The bypass channel Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then
reestablish proper erosion control.
Turf reinforcement is Study the site to see if a larger
damaged or ripap is rolling bypass channel is needed (enlarge if
downhill. necessary). After this, reestablish
the erosion control material.
The filter strip Grass is too short or too long Maintain grass at a height of
if applicable). approximately three to six inches.
Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then plant a
ground cover and water until it is
established. Provide lime and a
one-time fertilizer application.
Sediment is building up on Remove the sediment and
the filter strip. restabilize the soil with vegetation if
necessary. Provide lime and a one-
time fertilizer application.
Plants are desiccated. Provide additional irrigation and
fertilizer as needed.
Plants are dead, diseased or Determine the source of the
dying. problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide a one-time
fertilizer application.
Nuisance vegetation is Remove vegetation by hand if
choking out desirable species. possible. If pesticide is used, do not
allow it to get into the receiving
water.
The receiving water Erosion or other signs of Contact the NC Division of Water
damage have occurred at the Quality local Regional Office, or the
outlet. 401 Oversight Unit at 919-733-1786.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 2 of 3
Permit Number:
(to be provided by DWQ)
I acknowledge and agree by my signature below that I am responsible for the
performance of the maintenance procedures listed above. I agree to notify DWQ of any
problems with the system or prior to any changes to the system or responsible party.
Project name:Rose of Sharon
BMP drainage area number:Level Spreader 1
Print name:Susan Fox Beischer
Title:Land Owner
Address:2726 Croasdaile Drive Durham, NC 27705
Phone:[phone]
Date: (d " 7 / U
Note: The legally responsible party should not be a homeowners association unless more than 50% of
the lots have been sold and a resident of the subdivision has been named the president.
a Notary Public for the State of
/VlI2?/? ?? N , County of do hereby certify that
?L4S A? l /mixes/5[%?i e rt personally appeared before me this
day of o J u?vc__. aDQ , and acknowledge the due execution of the
forgoing filter strip, riparian buffer, and/or level spreader maintenance requirements.
Witness my hand and official seal,
•••• ~0%
%
• Notary
•
o •
Public
Cba>?'
SEAL
My commission expires_MWe, a0 //
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 3 of 3