HomeMy WebLinkAboutWPO201500037 Calculations WPO VSMP 2019-02-04 s"_ PROJECT eNAGEMENT
rt CIVIL ENGINEERING
LAND PLANNING
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November 12, 2015
Ms. Megan Yaniglos
Regarding: SUB 2015-00066-Chesterfield Landing
(Previously Wayland's Ridge)
Road Plans
Dear Ms. Yaniglos,
Please find attached 3 copies of the computations and exhibits relating to the Road Plans for Chesterfield Landing,
as listed below:
• Storm Structure Drainage Map
• Post-Development Time of Concentration Calculations
• LD-204
• LD-229
• LD-268
• LD-347
Please forward one set of computations, as well as the attached Maintenance of Traffic Plan, to Shelly Plaster at
VDOT.
If you have any questions please do not hesitate to contact me at your earliest opportunity at lauren@shimp-
engineering.com or Justin Shimp, P.E. may be reached at:justin@shimp-engineering.com or by phone at 434-953-
6116.
Best Re ards, (
Lauren ' oy
Shimp Engineering, P.C.
APPROVED
by the Albemarle County
Community Dgve)opment Department
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Virginia Runoff Reduction Method New Development Worksheet -- v2.8 _2011Specs
Site Data Revised April 2014
Project Name: Wayland's Ridge
Date: 05/15/2015
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data input cells
calculation cells
constant values
1
1. Post-Development Project & Land Cover Information - •
Constants
Annual Rainfall(inches) -11
Target Rainfall Event(inches) 1.00
Phosphorus EMC(mg/L) 0.26 Nitrogen EMC(mg/L) 1.86
Target Phosphorus Target Load (Ib/acre/yr) 0.41
Pj 0.90
Land Cover (acres)
I
A soils B Soils C Soils D Soils Totals
Forest/Open Space (acres)-- undisturbed,
protected forest/open space or reforested land ( 3.87 0.63 2.73 0.00 7.23
Managed Turf(acres) --disturbed, graded for
yards or other turf to be mowed/managed 0.00 10.22 1.12 0.00 11.34
Impervious Cover(acres) 0.00 3.84 0.00 AIIIIIIINIII 3.84
Total j 22.41
Rv Coefficients
A soils B Soils C Soils D Soils
Forest/Open Space 0.02 0.03 0.04 0.05
Managed Turf 0.15 0.20 0.22 0.25
Impervious Cover 0.95 0.95 0.95 0.95
Land Cover Summary
Forest/Open Space Cover(acres) 7.23
Weighted Rv(forest) 0.03
of Forest 32%
Managed Turf Cover(acres) 11.34
Weighted Rv(turf) 0.20
% Managed Turf 51%
Impervious Cover(acres) 3.84
Rv(impervious) 0.95
Impervious 17%
Total Site Area (acres) 22.41
Site Rv 0.27
Post-Development Treatment Volume (acre-ft) 0.51
Post-Development Treatment Volume (cubic
feet) 22,311
Post_Development Load (TP) (Ib/yr) 14.02 Post_Development Load (TN) (Ib/yr)) 100.28
Total Load (TP) Reduction Required (Ib/yr) 4.83
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Virginia Runoff Reduction Method Worksheet
',nor Nrsor
Virginia Runoff Reduction Method New Development Worksheet--v2.8_2011 Specs
Site Data Summary
Total Rainfall= 43 inches
Site Land Cover Summary
A Soils B Soils C Soils D Soils Total %of Total
Forest(acres)
3.87 0.63 2.73 0.00 7.23 32.25
Turf(acres) 0.00 10.22 1.12 0.00 11.34 50.61
Impervious(acres) 0.00 3.84 0.00 0.00 3.84 17.14
22.41 100.00
Site Rv 0.27
Post Development Treatment Volume(ft3) 22311
Post Development TP Load(Ib/yr) 14.02
Post Development TN Load(Ib/yr) 100.28
Total TP Load Reduction Required(lb/yr) 4.83
Total Runoff Volume Reduction(ft3) 9020
Total TP Load Reduction Achieved(lb/yr) 6
Total TN Load Reduction Achieved(Ib/yr) 81.00
Adjusted Post Development TP Load(Ib/yr) 8.36
Remaining Phosphorous Load Reduction(Lb/yr)Required 0,00
Drainage Area Summary
Forest(acres) D.A.A D.A.B D.A.C D.A.D D.A.E Total
Turf(acres) 0.00 0.00 0.00 0.00 0.00 0.00
9.22 0.00 0.00 0.00 0.00 9.22
Impervious(acres) 3.27 0.00 0.00 0.00 0.00
3.27
12.49
Drainage Area Compliance Summary
D.A.A D.A.I3 D.A.C D.A.D D.A.E Total
TP Load Red.(Ib/yr) 5.66 0.00 0.00 0.00 0.00 5.66
TN Load Red.(Ib/yr) 81.00 0.00 0.00 0.00 0.00 81.00
Summary Print
Virginia Runoff Reduction Method Worksheet•
* /
Drainage Area A Summary
Land Cover Summary
A Soils B Soils C Soils D Soils Total %of Total
Forest(acres) 0.00 0.00 0.00 0.00 0.00 0.00
Turf(acres) 0.00 8.10 1.12 0.00 9.22 73.85
Impervious(acres) _ 0.00 3.27 0.00 0.00 3.27 26.15
12.49
BMP Selections
Practice Credit Area(acres) Downstream
Practice
9.b.Sheetflow to Conservation Area with C/D Soils(Spec#2) Impervious: 3.092401
Turf(Pervious): 8.726492
Total Impervious Cover Treated(acres) 3.27
Total Turf Area Treated(acres) 9.22
Total TP Load Reduction Achieved in D.A.A(lb/yr) 5.66
Total TN Load Reduction Achieved in D.A.A(Ib/yr) 81.00
Summary Print
Virginia Runoff Reduction Method Worksheet y
1
Channel and Flood Protection
Weighted CN 1-year 2-year storm 10-year
storm Adjusted CN storm
Adjusted Adjusted
CN CN
Target Rainfall Event(in) 3.05 3.69 5.57
D.A.A CN 72 68 69 70
D.A.B CN 0 #N/A #N/A #N/A
D.A.C CN 0 #N/A #N/A #N/A
D.A.DCN 0 #N/A #N/A #N/A
D.A.E CN 0 #N/A #N/A #N/A
Summary Print