Transcript
8/8/2019 Final Wake Sw Tool v22
1/18Wake County Stormwater ToolVersion 2.2
09/09/2010 05:10:27
Stormwater Management Plan S/D No.: 0
0 Date: 12/30/1899
0 Designer: 0
SUMMARY INFORMATION
Site DataTotal Area: 0 acres
Zoning: 0
Number of Lots: 0
Percent Impervious: #DIV/0! %
Volume Management Calculations
Target Curve Number: 0
Proposed Curve Number: 0
Total Volume Required: #DIV/0!
Total Volume Provided: 0
Nitrogen Calculations
TN Loading from Site: #DIV/0! lbs/ac/yr
Buy-down (if in NRB): #DIV/0!
Peak Flow Management Calculations:
Pre-Development Peak Flow: #DIV/0! cfs
Post-Development Peak Flow: #DIV/0! cfs
ft3
ft3
8/8/2019 Final Wake Sw Tool v22
2/18Wake County Stormwater ToolVersion 2.2
09/09/2010 05:10:27
Stormwater Management Plan S/D No.:
Date:
Designer:
TARGET CURVE NUMBER CALCULATION
Wake County Target Curve Numbers
Zoning District A B C D
R-80W and R-80 37 60 73 79
R-40W and R-40 41 62 75 80
R-30, R-20, R-15, R-5 43 63 76 81
Site Data:Total Site Area: acres **Excludes Area of Exisitng Lakes or Ponds on site
Existing Lake/Pond Area: acres
Area used for Overall Density Calcs: 0 acres
Zoning District:
Soil Composition:Hydrologic Soil Group Site Area % Target CN
A #DIV/0! 43
B #DIV/0! 63
C #DIV/0! 76
D #DIV/0! 81
100%
Target Curve Number: 0
Runoff (inches) = Q* = 0.00 inches
8/8/2019 Final Wake Sw Tool v22
3/18Wake County Stormwater ToolVersion 2.2
09/09/2010 05:10:27
Stormwater Management Plan S/D No.: 00 Date: 12/30/1899
0 Designer: 0
PRELIMINARY PLAN SUBMITTAL
Site Data:0 acres
Zoning District: 0
Number of Lots:
Total Area in R/W: acres
Impervious Area in R/W: acres
acres
acres
acres
%
Lot Data:
Total Lot Acreage: 0 acres
Impervious Area per Lot: sf
0 %
acresAverage Lot Size: #DIV/0! sf
Average Percent Impervious per Lot: #DIV/0! %
#DIV/0! %
Stormwater Calculations:
Woods #DIV/0! #DIV/0!
Grass/Lawn #DIV/0! #DIV/0! A
Impervious #DIV/0! #DIV/0! B
#DIV/0! D
Target Curve Number: 0
Results:
#DIV/0!cf
Preliminary Total Nitrogen
#DIV/0! lbs/ac/yr
R=
Total Site Area:(Excluding Area in Existing Water Bodies)
reserve oo e rea:(Common Open Space to remain woods
or be reforested; Stream Buffers not onlots.)
Managed Open Space:(Grassed Common Open Space)
Other Impervious Surface:(Impervious not on lots or in R/W)
Percent of Total Imperviousthat is Disconnected:
(50% is default. See Table 3.3.)
Assumed Wooded Area:(Design Manual Table 3.1)
Additional Wooded Area:(Stream Buffer or Additional wooded area on lots.
Must be recorded on Plat.)
Percent Impervious for site*:*Using total site area plus existing lakes/ponds
Weighted CN1
Proposed Curve Number:1
1 Weighted CN method represents the CN when the landuse is evenly distributed among all on-site soils (w/exemption of R/W which is D soils); It is an approximatecurve number for Post-development and should be treated as such.
Storage Volume Required:(Approximate locations shown on Preliminary Plan)
Loading from Site:2 CNp=
2 Preliminary nitrogen loading does not include any reductions by BMPs. If loading is above3.6 lbs/ac/yr - BMPs or a buydown will be required.
8/8/2019 Final Wake Sw Tool v22
4/18Wake County Stormwater ToolVersion 2.2
09/09/2010 05:10:28
Stormwater Management Plan S/D No.:
0 Date:
0 Designer:
POST-DEVELOPMENT CALCULATIONS
CURVE NUMBER:
Is Data from Preliminary Plan Still Valid?Total Area of Lots: acres
Number of Lots:
Impervious Area per Lot: sf % Impervious on Lots: #DIV/0! %
% Woods on Lots: %
% Impervious in R/W: %
#DIV/0! %
Percent of Total Disconnected Impervious: 50
HSG Land-use CN Area (acres) %0 #DIV/0!
0 #DIV/0!
0 #DIV/0!
0 #DIV/0!
0 #DIV/0!
0 #DIV/0!
0 #DIV/0!
0 #DIV/0!
0 #DIV/0!
0 #DIV/0!
0 #DIV/0!
0 #DIV/0!
0 #DIV/0!
0 #DIV/0!
0 #DIV/0!
0 #DIV/0!
Totals: 0 #DIV/0!
Post-Development CN = 0
Runoff (inches) = Q* = 0.00 inches
Warnings/Notes:
#DIV/0!
Percent Impervious for Site*:*Using total site area plus existing lakes/ponds
% (50% is Default. See Table 3.3)
8/8/2019 Final Wake Sw Tool v22
5/18
Wake County Stormwater Tool 09/09/2010 05:10:28
8/8/2019 Final Wake Sw Tool v22
6/18Wake County Stormwater ToolVersion 2.2
09/09/2010 05:10:28
0
12/30/1899
0
Y
N
Totals
% R/W Dis?
A
8/8/2019 Final Wake Sw Tool v22
7/18Wake County Stormwater ToolVersion 2 2
09/09/2010 05:10:28
8/8/2019 Final Wake Sw Tool v22
8/18Wake County Stormwater ToolVersion 2.2
09/09/2010 05:10:28
Stormwater Management Plan S/D No.: 0
0 Date: 12/30/1899
0 Designer: 0
PRE-DEVELOPMENT CALCULATIONS
CURVE NUMBER:
HSG Land-use CN Area (acres) %
98 #DIV/0!
98 #DIV/0!
98 #DIV/0!
98 #DIV/0!
98 #DIV/0!
98 #DIV/0!
98 #DIV/0!
98 #DIV/0!
98 #DIV/0!
98 #DIV/0!98 #DIV/0!
98 #DIV/0!
User Defined #DIV/0!
User Defined #DIV/0!
User Defined #DIV/0!
User Defined #DIV/0!
Totals: 0 #DIV/0!
Pre-development CN = #DIV/0!
Runoff (inches) = Q* = #DIV/0! inches
TIME OF CONCENTRATION:
Length (ft) Slope (ft/ft) Surface Cover
Sheet Flow:
Sheet Flow:
Shallow Flow:
Shallow Flow:
Length (ft) Slope (ft/ft) n-value Wetted Perimeter (ft)
Channel Flow:
Channel Flow:
0.08 hrs (Minimum 5 minutes)
Tt(hrs)
FlowArea (ft2) Tt (hrs)
Pre-development Tc
=
8/8/2019 Final Wake Sw Tool v22
9/18Wake County Stormwater ToolVersion 2.2
09/09/2010 05:10:28
Stormwater Management Plan S/D No.: 0
0 Date: 12/30/1899
0 Designer: 0
TIME OF CONCENTRATION:
Length (ft) Slope (ft/ft) Surface Cover
Sheet Flow:
Sheet Flow:
Shallow Flow:
Shallow Flow:
Length (ft) Slope (ft/ft) n-value Wetted Perimeter (ft)
Channel Flow:
Channel Flow:
0.08 hrs (Minimum 5 minutes)
POST-DEVELOPMENT CALCULATIONS
Tt(hrs)
FlowArea (ft2) Tt (hrs)
Post-development Tc
=
8/8/2019 Final Wake Sw Tool v22
10/18Wake County Stormwater ToolVersion 2.2
09/09/2010 05:10:28
Stormwater Management Plan S/D No.: 0
0 Date: 12/30/1899
0 Designer: 0
PEAK FLOW CALCULATIONS
CURVE NUMBER:
Pre-development CN = #DIV/0!
#DIV/0!
TIME OF CONCENTRATION:
0.08 hrs
0.08 hrs
PEAK FLOW:
Method: TR-55 Graphical Peak Discharge Method for Type II Distribution
Where:
Q* = runoff (inches)
Pre-development
#DIV/0! csm/in
0.00
Q* = #DIV/0! inches
#DIV/0!cfs
Post-development
#DIV/0! csm/in
0.00
Q* = #DIV/0! inches
#DIV/0!cfs
#DIV/0!
Post-Development CNadj
=
Pre-development Tc
=
Post-development Tc
=
Qp
= quA
mQ*
Qp
= Peak Discharge (cfs)
qu
= Unit peak discharge (csm/in) TR-55 Appendix F
Am
= Drainage Area (mi2)
qu
=
Am
= mi2
Q1-year
=
qu
=
Am
= mi2
Q1-year
=
8/8/2019 Final Wake Sw Tool v22
11/18Wake County Stormwater ToolVersion 2.2
09/09/2010 05:10:28
Stormwater Management Plan S/D No.:
0 Date:
0 Designer:
PROPOSED STORAGE DEVICES
Name/Location Type of Device Additional Comment
1
2
3
4
5
6
7
8
910
11
12
13
14
15
16
17
18
19
20
Total Volume Provided: 0#DIV/0! #DIV/0! #DIV/0!
0
#DIV/0!
Total Volume Required: #DIV/0!
Post-Development Curve Number Adjustment based on Volume Provided
Source: "Modeling Infiltration Practices Using TR-20", October, 1983, Maryland Department of the Environment
200
Where:
P = Rainfall (inches) = 3 inches
Q = Runoff Depth for Proposed CN (Q*) - Volume Provided (inches)
Volume Provided (Inches) = #DIV/0! inches
Q* = 0.00 inches
Q = #DIV/0! inches
#DIV/0!
Enter only runoff volume below that will be infiltrated or drawn down over 2 to 5 days. Avolume provided in devices should not be entered in this worksheet.
Storage VolumeProvided (ft3)
ft3
Volume Required by WakeCounty Ordinance: ft3
Minimum Volume Required to Meet PeakFlows for Neuse Rules: ft3
ft3
CNadj
=(P+2Q+2) - (5PQ+4Q2)1/2
Post-Development CNadj =
8/8/2019 Final Wake Sw Tool v22
12/18
Wake County Stormwater Tool 09/09/2010 05:10:28
8/8/2019 Final Wake Sw Tool v22
13/18Wake County Stormwater ToolVersion 2.2
09/09/2010 05:10:28
0
12/30/1899
0
#DIV/0!
ditional
8/8/2019 Final Wake Sw Tool v22
14/18
Wake County Stormwater Tool 09/09/2010 05:10:28
8/8/2019 Final Wake Sw Tool v22
15/18Wake County Stormwater ToolVersion 2.2
09/09/2010 05:10:29
Stormwater Management Plan S/D No.:
0 Date:
0 Designer:
NITROGEN CALCULATIONS
Type of Land Cover Area (acres)
0.00 0.60 0.00
#DIV/0! 1.20 #DIV/0!
#DIV/0! 21.20 #DIV/0!
TOTAL 0.00 #DIV/0!
Nitrogen Loading w/out BMP Reductions: #DIV/0! lbs/ac/yr
Neuse Buy-down w/out BMP Reductions: #DIV/0!
Nitrogen Loading with BMP Reductions
See Wake County Stormwater Design Manual Chapter 4 for Details
Drainage Area 1:
Type of Land Cover Area (acres)
Permanently protected open space 0.60 0.00
Managed open space 1.20 0.00
Impervious surfaces 21.20 0.00
TOTAL 0.00 0.00
Nitrogen Removal Efficiency of BMP(s) %
Nitrogen Loading for DA 1: 0.00 lbs/ac/yr
Drainage Area 2:
Type of Land Cover Area (acres)
Permanently protected open space 0.60 0.00
Managed open space 1.20 0.00
Impervious surfaces 21.20 0.00
TOTAL 0.00 0.00
Nitrogen Removal Efficiency of BMP(s) %
Nitrogen Loading for DA 2: 0.00 lbs/ac/yr
Drainage Area 3:
Type of Land Cover Area (acres)
Permanently protected open space 0.60 0.00
Managed open space 1.20 0.00
Impervious surfaces 21.20 0.00
TOTAL 0.00 0.00
Nitrogen Removal Efficiency of BMP(s) %Nitrogen Loading for DA 3: 0.00 lbs/ac/yr
Final Nitrogen Loading from Site: #DIV/0! lbs/ac/yr
TN exportcoefficient
(lbs/ac/yr)
TN exportfrom use
(lbs/yr)
Permanently protected undisturbed openspace (forest, unmown meadow)
Permanently protected managed openspace (grass, landscaping, etc.)
Impervious surfaces (roads, parking lots,driveways, roofs, etc.)
TN coeff.(lbs/ac/yr)
TN export(lbs/yr)
TN coeff.(lbs/ac/yr)
TN export(lbs/yr)
TN coeff.(lbs/ac/yr)
TN export(lbs/yr)
8/8/2019 Final Wake Sw Tool v22
16/18Wake County Stormwater ToolVersion 2.2
09/09/2010 05:10:29
Buy-down (Neuse Only):#DIV/0!
8/8/2019 Final Wake Sw Tool v22
17/18Wake County Stormwater ToolVersion 2.2
09/09/2010 05:10:29
0
12/30/1899
0
8/8/2019 Final Wake Sw Tool v22
18/18
top related