HomeMy WebLinkAboutSDP200600064 Calculations 2006-06-26Design Calculations
FOR
Hollymead Town Center
Area C, Block 3
Lot A
PREPARED BY t
wroin . """ ENGINEERS
SURVEYORS ti‘
PLANNERS
ASSOCIATES
1402 Greenbrier Place
Charlottesville, Virginia 22901
434)984 -2700
LTH0
June 26, 2006 0 7P,Project Number: 205106.02 C /
DAVID M. JENSEN 5
No 114
kr 44 "
48.10isiAL
Design Calculations WW# 205106.02
Table of Contents
A. Stormwater Management
B. Erosion and Sediment Control
C. Storm Draining and Paving
Design Calculations WW# 205106.02
Stormwater Management
Stouiiwater Management quantity and quality controls for Area C Block 3 of Hollymead
Town Center is provided in existing Hollymead Town Center Stormwater Management
Facility 2. The area of Block 3 Lot A is 1.25 acres of which 1.04 acres is impervious
which yields a weighted C values of 0.83 and is thus, in compliance with the post -
developed weighted C value of drainage area DA -U (post - developed drainage area
directed to 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.
Additional water quality control for this block is to be provided via a water quality swale
below the future parking along Lookwood Road.
Design Calculations WW# 205106.02
Erosion and Sediment Control
Excavated Drop Inlet Sediment Trap
D -4
D.A. = 0.97 Acres
Initial Storage Required
0.97 acres * 134 CY = 130 CY
Wet = 65 CY
Dry = 65 CY
Stage Elevation Contour Incremental Total Total
Area (S.F.) Storage Storage Storage
C.F.)C.F.)C.Y.)
0 589 206 0 0 0
2 591 856 1062 1062 39
4 593 1975 2831 3893 144
D -2
D.A. = 0.46 Acres
Initial Storage Required
0.46 acres * 134 CY = 62 CY
Wet =31 CY
Dry = 31 CY
Stage Elevation Contour Incremental Total Total
Area (S.F.) Storage Storage Storage
S.F.)S.F.)C.Y.)
0 587 50 0 0 0
2 589 375 425 425 16
4 591 956 1331 1756 65
Design Calculations WW# 205106.02
Sediment Trap
Disturbed Area = 2.24 Acres
Initial Storage Required
2.24 acres * 134 CY = 300.2 CY
Wet = 150.1 CY
Dry = 150.1 CY
Stage Elevation Contour Incremental Total Total
Area (S.F.) Storage Storage Storage
S.F.)S.F.)C.Y.)
0 580 477 0 0 0
2 582 1228 1705 1705 63
4 584 2228 3456 5161 191
6 586 3473 5701 10862 402
There are no further design calculations required as based on the controls provided.
Design Calculations WW# 205106.02
Storm Drainage and Paving
Pavement Design
Assisted Living Facility = 257 VPD (Per ITE Equation)(# beds)
213 VPD (Per ITE Equation)(# employees)
Total =470 VPD
Assumed SSV =5.0
T =11.5
1.5 "SM -9.5A @ 2.25 = 3.37
3 "BM -25.0 @ 2.25 = 6.75
5 "21 -A @0.60 =4.20
TI = 14.3 > 11.5 OK
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n CalculationsDesig 444 14
FOR
Hollymead Town Center
Area C, Block 3
LotA
PREPARED BY
AMMO
AlamomsWIMIAMI"11°."."1.11.611
11
ENGINEERS
SURVEYORS
PLANNERS
ASSOCIATES
1402 Greenbrier Place
Charlottesville, Virginia 22901
434)984 -2700
June 26, 2006
Revised August 25, 2006 4v,ALTH OFProjectNumber: 205106.02
N -C)7/1711,,,%
L DAVID M. JENSEN
No.)1484
6SIONAL
Design Calculations WW# 205106.02
Table of Contents
A. Stormwater Management
B. Erosion and Sediment Control
C. Storm Draining and Paving
Design Calculations WW# 205106.02
Stormwater Management
Stormwater Management quantity and quality controls for Area C Block 3 of Hollymead
Town Center is provided in existing Hollymead Town Center Stormwater Management
Facility 2. The area of Block 3 Lot A is 1.25 acres of which 1.04 acres is impervious
which yields a weighted C values of 0.83 and is thus, in compliance with the post -
developed weighted C value of drainage area DA -U (post- developed drainage area
directed to 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.
Additional water quality control for this block is to be provided via a water quality swale
below the future parking along Lookwood Road.
Design Calculations WW# 205106.02
Erosion and Sediment Control
Sediment Trap D -1
Disturbed Area = 2.24 Acres
Initial Storage Required
2.24 acres * 134 CY = 300.2 CY
Wet = 150.1 CY
Dry = 150.1 CY
Stage Elevation Contour Incremental Total Total
Area (S.F.) Storage Storage Storage
S.F.)S.F.)C.Y.)
0 580 477 0 0 0
2 582 1228 1705 1705 63
4 584 2228 3456 5161 191
6 586 3473 5701 10862 402
There are no further design calculations required as based on the controls provided.
Design Calculations WW# 205106.02
Storm Drainage and Paving
Pavement Design
Assisted Living Facility = 257 VPD (Per ITE Equation)(# beds)
213 VPD (Per ITE Equation)(# employees)
Total =470 VPD
Assumed SSV =5.0
T=11.5
1.5 "SM -9.5A @2.25 =3.37
3 "BM -25.0 @2.25 =6.75
5 "21 -A @0.60 =4.20
TI= 14.3 >11.5 OK
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