HomeMy WebLinkAboutWPO200500072 Calculations 2005-09-13 Design Calculations WW# 204224.00
Stormwater Management
.
Stormwater Management quantity and quality controls for Area C Block 5 of Hollymead
Town Center is provided in existing Hollymead Town Center Stormwater Management
a Facility 2. The area of Block 5 is 2.67 acres of which 2.49 acres is impervious which
yields a weighted C values of 0.85 and is thus, in compliance with the post - developed
weighted C value of drainage area DA -U (post- developed drainage area directed to
aar stormwater Management Facility 2). Drainage divides as established by Timberwood
Boulevard Phase 2 Road Plans and Hollymead Town Center Stormwater Management
Facility 2 has been honored with this plan.
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Design Calculations WW# 204224.00
�• Erosion and Sediment Control
ST -74
D.A. = 2.78 Acres
Initail Storage Required
2.78 acres * 134 CY = 372.5 CY
Wet = 186.25 CY
Dry = 186.25 CY
Stage Elevation Contour Incremental Total Total
Area (S.F.) Storage Storage Storage
(S.F.) (S.F.) (C.Y.)
0 568.00 190 0 0 0
2 570.00 1150 1340 1340 49.6
4 572.00 2140 3290 4630 171.3
6 574.00 3630 5770 10400 384.8
Set invert @ 572.14 from stage storage table.
D -1
D.A. = 2.67 Acres
Initail Storage Required
2.67 acres * 134 CY = 358.0 CY
�• Wet = 179 CY
Dry = 179 CY
Stage Elevation Contour Incremental Total Total
Area (S.F.) Storage Storage Storage
(S.F.) (S.F.) (C.Y.)
0 584 350 0 0 0
2 586 1350 1700 1700 62.9
4 588 1975 3325 5025 185.9
6 590 2820 4795 9820 363.3
Set invert @ 587.88 from stage storage table.
There are no further design calculations required as based on the controls provided.
Design Calculations WW# 204224.00
$— Storm Drainage and Paving
Pavement Design
Laurel Park Lane
Traffic
20 Multi — Family Units @ 7 VPD/Unit = 140 VPD (VDOT)
42,000 GSF Office = 463 VPD (Per ITE Equation)
31,000 GSF Commercial = 1333 VPD (Per ITE Avg. Rate)
Total = 1936 VPD
Assumed SSV = 10
T = 15.5
2" SM — 9.5A @ 2.25 = 4.50
3 "BM -25.0 @2.25 =6.75
8 "21 -A @ 0.67 = 8.67
TI = 19.92 > 15.5 OK
Access Aisle
42 Units @ 10 VPD/Unit = 420 VPD
210 VPD Each Entrance
Assumed SSV = 10
T = 8.8
2" SM — 9.5A @ 1.67 = 3.34
6 "21 -A @ 1.00 = 6.00
TI = 9.34> 8.8 OK
Grand Forks Boulevard
20 Units @ 10 VPD/Unit = 200 VPD
100 VPD Each Entrance
Assumed SSV = 10
T = 7.5
2" SM — 9.5A @ 1.67 = 3.34
6 "21 -A @ 1.00 =6.00
TI= 9.34 >7.50K
1
General Office Building
. (710)
Average Vehicle Trip Ends vs: 1000 Sq. Feet Gross Floor Area
On a: Weekday
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Number of Studies: 78
Average 1000 Sq. Feet GFA: 199
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' Directional Distribution: 50% entering, 50% exiting
.
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Trip Generation per 1000 Sq. Feet Gross Floor Area
Average Rate Range of Rates Standard Deviation
11.01 3.58 - 28.80 6.13
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Data Plot and Equation
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X Actual Data Points Fitted Curve Average Rate
Fitted Curve Equation: Ln(T) = 0.77 Ln(X) + 3.65 R = 0.80
Trip Generation, 7th Edition 1158 Institute of Transportation Engineers
Shopping Center
(820)
Average Vehicle Trip Ends vs: 1000 Sq. Feet Gross Leasable Area
On a: Weekday
Number of Studies: 302
Average 1000 Sq. Feet GLA: 328
... Directional Distribution: 50% entering, 50% exiting
Trip Generation per 1000 Sq. Feet Gross Leasable Area
Average Rate Range of Rates Standard Deviation
42.94 12.50 - 270.89 21.38
a
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—
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0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600
X = 1000 Sq. Feet Gross Leasable Area
w" X Actual Data Points Fitted Curve
Average Rate
Fitted Curve Equation: Ln(T) = 0.65 Ln(X) + 5.83 R2 _
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Trip Generation, 7th Edition 1451 Institute of Transportation Engineers
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