HomeMy WebLinkAboutWPO201300022 Calculations 2013-03-27 (3) .
TEMPORARY SEDIMENT BASIN COMPUTATIONS
FOR
Whittington Subdivision — Phase A
March 15, 2011
Revised: August 10, 2011
Revised: November 3, 2011
LOCATION:
Tax Map 89, Parcel 95
Tax Map 90, Parcels 3, 45,46,47,48
Samuel Miller District, Albemarle County, Virginia
OWNER / DEVELOPER:
Whittington, LLC
2421 Ivy Road
Charlottesville, VA 22903
PREPARED BY:
Dominion Engineering and Design, LLC
172 South Pantops Drive
Charlottesville, VA 22911
P: 434.979.8121
F: 434.979.1681
1
TEMPORARY SEDIMENT BASIN
PROJECT 90-3 I- PROJ NO. 7.0228
BASIN# SEDIMENT BASIN SB-1
DATE 2011-11-07
LOCATION BY CWS
INPUT
DRAINAGE AREA 12.20 ac
BASIN VOLUME DESIGN
WET STORAGE
1.MINIMUM REQUIRED VOLUME 817.40 cy
2.AVAILABLE BASIN VOLUME
AVERAGE END AREA-BASIN VOLUME ESTIMATES
ELEVATIOII AREA VOLUME I VOLUME I TOTAL
ft I sf cf cy I cy
483.49 20.00
75.10 2.78
483.5 15,000.00 2.78
39,652.50 1,468.61
486 16,722.00 L 1,471.39
29,454.00 1,090.89
487.5 22,550.00 2,562.28
171,245.00 6,342.41
493.3 36,500.00 8,904.69
REQUIRED WET STORAGE VOLUME 817.40 cy
APPROX.ELEVATION 485.58
3.EXCAVATE CUBIC YARDS
4.AVAILABLE VOLUME BEFORE CLEANOUT REQUIRED 402.60 cy
5.ELEVATION CORRESPONDING TO CLEANOUT LEVEL 486.00
6.DISTANCE FROM DEWATERING ORIFICE TO C/O LEVEL
INVERT DEWATERING ORIFICE R'QD 485.58
INVERT DEWATERING ORIFICE USED 487.50
APPROX.VOLUME AT INVERT USED I 2823.11 cy
DISTANCE FROM INVERT TO C/0 LEVEL 1.50 ft
DISTANCE ACCEPTABLE
WET STORAGE VOLUME ACCEPTABLE
DRY STORAGE
7.MINIMUM REQUIRED VOLUME 817.40 _c_y
I _L
8.TOTAL AVAILABLE VOLUME AT CREST OF RISER
CREST OF RISER I 491.80
/APPROX.AVAILABLE TOTAL VOLUME 7292.13 cy
IADEQUATE DRY STORAGE VOLUME
9.DIAMETER OF DEWATERING ORIFICE
HT---C
- 1.02 cfs
5.15 in
USE d 3'in
10.DIAMETER OF FLEXIBLE TUBING 6 I in
STANDARD SIZE
PRELIMINARY DESIGN
11.PRELIMINARY DESIGN ELEVATIONS:
CREST OF RISER 491.80 ft
TOP OF DAM 493.30 ft
DESIGN HIGH WATER 492.30 ft *design of high water assumes a peak flowrate
UPSTREAM TOE OF DAM 483.50 ft of 19.50 cfs storage volume is not considered.
Page 1 90-3 SB.XLS
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TEMPORARY SEDIMENT BASIN
--- -- j
PROJECT 90-3 PROJ NO. 7.0228
BASIN# -- BASIN SB-1 T DATE 2011-11-07
LOCATION L_ 1 BY CWS
1 i
BASIN SHAPE
12.LENGTH OF FLOW/EFFECTIVE WIDTH:
SURFACE AREA OF NORMAL POOL F.-- 22550 sf
LENGTH OF FLOW PATH 200 ft
EFFECTIVE WIDTH 100 ft
LNVe 2.00 Baffles Not Required
RUNOFF 1
IRATIONAL METHOD CALCULATION)
USE MAXIMUM C VALUE DURING CONSTRUCTION AND MINIMUM Tc VALUE
13.FLOW FROM 2-YEAR STORM
1 C: 0.38
Tc: 30.01 I: 2.3 in/hr
Q. 10.7 cfs
14.FLOW FROM 25-YEAR STORM
C: 0.38
Tc: 30.0 I: 4.2 in/hr
4. 19.5 cfs
i
PRINCIPAL SPILLWAY DESIGN See Attached Calcs
I I
15.REQUIRED SPILLWAY CAPACITY:
EMERGENCY SPILLWAY?(YIN) y
REQUIRED SPILLWAY CAPACITY: 10.7 CFS
16.ASSUMED AVAILABLE HEAD:
-1-
ELEV.OF CREST OF E.S.IF USED: 491.90
ASSUMED AVAILABLE HEAD,. 0.40 ft r
17.RISER DIMENSIONS:
RISER DIAMETER: 48.00 (From Plate 3.14-8 or Calcs) 1
ACTUAL MAX.ELEV.: 492.30 ft (From Calcs if appropriate)
ACTUAL HEAD: 0.50 ft (From Plate 3.14-8 or Calcs)
18.BARREL LENGTH: 1
1
1 BARREL LENGTH: 75.00 ft I-
T
BARREL INVERT OUT: 484.75 fFt-
HEAD Ii ON BARREL:1 7.55 ft A_From Plate 3.14-7)
19.BARREL DIAMETER: 1
BARREL DIAMETER: 24 in (From Plate 3.14A or 3.145)
■
20.TRASH RACK AND ANTI-VORTEX DEVICE:
DIAMETER: 72 in (From Plate 3.14D)
HEIGHT: 21 in
EMERGENCY SPILLWAY DESIGN
1 I -
21.REQUIRED SPILLWAY CAPACITY:
Qe=Q(25)-Qp fin 8.8 CFS
22.DIMENSIONS: 1
FTioTTOM WIDTH(b): 12.00 ft ----t-
(From Table 3.14-C1
SLOPE OF EXIT CHANNEL(s): 0.04 ft/ft (From Table 3.14-C)I-
MIN.LENGTH EXIT CHANNEL(x): 33.00 ft (From Table 3.14-C)
F--- I_
ANTI-SEEP COLLAR DESIGN
- -r
23.DIMENSIONS:
DEPTH WATER @ CREST OF P.S.(Y): 8.30 ft -7--
SLOPE UPSTREAM FACE DAM(Z): 3.00 :1 1111
SLOPE P.S.BARREL(Sb): 1.67J% _I
LENGTH BARREL IN SAT.ZONE(La): 38.00 ft (From Plate 3:14-11
24.NUMBER OF COLLARS: I 1
NUMBER REQUIRED: 2 (From Plate 3.14-12) I
DIMENSIONS: 3.3IftA2 (From Plate 3.14-12t
FINAL DESIGN ELEVATIONS
----=
25.ELEVATIONS:
TOP OF DAM: 493.30 I ft T
1 DESIGN HIGH WATER: 492.30 ft ,,
EMERGENCY SPILLWAY CREST: 491.90 ft 1
PRINCIPAL SPILLWAY CREST: 491.80 ft
DEWATERING ORIFICE INVERT: 487.50 ft __i_ I
CLEANOUT ELEVATION: 486.00 ft
1 I
Page 2 90-3 SB.XLS
. -
TEMPORARY SEDIMENT BASIN
PROJECT_ 90-3 1PROJ NO. 7.0228
BASIN# I SEDIMENT BASIN SB-2 DATE 2011-11-07
LOCATION - BY -.-
CWS
I
INPUT
DRAINAGE AREA
I 1
BASIN VOLUME DESIGN
WET STORAGE
1.MINIMUM REQUIRED VOLUME 807.35 cy
2.AVAILABLE BASIN VOLUME
AVERAGE END AREA-BASIN VOLUME ESTIMATES
- T ELEVATIOI AREA VOLUME VOLUME I_ TOTAL
ft sf cf cy cy
• 485.99 20.00
20.10 0.74
486 4,000.00 I 0.74
23,800.00 881.48
490 7,900.00 882.23
7---
18400.00 681.48
492 10,500.00 1,563.71
I 40,203.00 1,489.00
495 16,302.00 3,052.71
■
REQUIRED WET STORAGE VOLUME 807.35 cy
APPROX.ELEVATION 489.13
3.EXCAVATE CUBIC YARDS
4.AVAILABLE VOLUME BEFORE CLEANOUT REQUIRED 397.65 cy
5.ELEVATION CORRESPONDING TO CLEANOUT LEVEL 1 490.00
I 1 1 1
6.DISTANCE FROM DEWATERING ORIFICE TO C/O LEVEL 7
I INVERT DEWATERING ORIFICE R'QD 1- 489.131
INVERT DEWATERING ORIFICE USED 491.50
APPROX.VOLUME AT INVERT USED 1625.08 cy
DISTANCE FROM INVERT TO C/O LEVEL 1.50 ft
_
DISTANCE ACCEPTABLE
1WET STORAGE VOLUME ACCEPTABLE
1 I
DRY STORAGE L I
7.MINIMUM REQUIRED VOLUME I I 807.35 cy
8.TOTAL AVAILABLE VOLUME AT CREST OF RISER _
CREST OF RISER I 495.40
APPROX.AVAILABLE TOTAL VOLUME 2926.31 cy
ADEQUATE DRY STORAGE VOLUME T
I I
9.DIAMETER OF DEWATERING ORIFICE
Q 1.01 cfs
- d 5.25 in
USE d 4 in
10.DIAMETER OF FLEXIBLE TUBING 6 in
STANDARD SIZE 1
PRELIMINARY DESIGN
1----- 1 I
11.PRELIMINARY DESIGN ELEVATIONS: I
CREST OF RISER 492.50 ft
TOP OF DAM 495.00 ft
I DESIGN HIGH WATER 494.00 ft *design of high water assumes a peak flowrate
UPSTREAM TOE OF DAM 486.00 ft of 14.50 cfs storage volume is not considered.
----1 I I
Page 1 90-3 SB.XLS
.
TEMPORARY SEDIMENT BASIN
PROJECT 190-3 i T PROJ NO. 7.0228
,BASIN# SEDIMENT BASIN SB-2 1DATE 2011-11-07
,LOCATION I BY CWS
BASIN SHAPE
SURFACE AREA OF NORMAL POOL1 8300 sf
LENGTH OF FLOW PATH I 100 ft __I_
EFFECTIVE WIDTH 90 ft
_ L/We 1.11 BAFFLES REQUIRED
(RATIONAL METHOD CALCULATION)
,USE MAXIMUM C VALUE DURING CONSTRUCTION AND MINIMUM Tc VALUE _L
13.FLOW FROM 2-YEAR STORM li_
14.FLOW FROM 25-YEAR STORM _1_
C: 0.30
Q= 14.5 cfs
PRINCIPAL SPILLWAY DESIGN
15.REQUIRED SPILLWAY CAPACITY:
EMERGENCY SPILLWAY?(Y/N) Y
REQUIRED SPILLWAY CAPACITY:, 8.31CFS .1-
16.ASSUMED AVAILABLE HEAD:
ELEV.OF CREST OF E.S.IF USED: 493.50 _
ASSUMED AVAILABLE HEAD= 0.50 ft
RISER DIAMETER:1 48.001 (From Plate 3.14-8 or Calcs)
ACTUAL MAX.ELEV.: 494.00 ft From Calcs if a..ro.riate
ACTUAL HEAD: 1.50 ft From Plate 3.14-8 or Calcs)
18.BARREL LENGTH: 1
1 BARREL LENGTH: 80.00 ft
1 BARREL INVERT OUT: 486.00 ft T
HEAD H ON BARREL: 8.001ft From Plate 3.14-71_
1 BARREL DIAMETER: 24 in From Plate 3.14A or 3.14B)
20.TRASH RACK AND ANTI-VORTEX DEVICE:
1 DIAMETER: 72 in From Plate 3.14D)
EMERGENCY SPILLWAY DESIGN
21.REQUIRED SPILLWAY CAPACITY:
22.DIMENSIONS: I
1 BOTTOM WIDTH(b): 14.00 ft (From Table 3.14-C)
SLOPE OF EXIT CHANNEL(s):1 0.04 ft/ft (From Table 3.14-C)
MIN.LENGTH EXIT CHANNEL(x):1 30.00 ft (From Table 3.14-C) T
ANTI-SEEP COLLAR DESIGN
23.DIMENSIONS:
DEPTH WATER @ CREST OF P.S.(Y): 6.50 ft
SLOPE UPSTREAM FACE DAM(Z): 3.00 :1
LENGTH BARREL IN SAT.ZONE(Ls): 30.00 ft _from Plate 3.14-111
24.NUMBER OF COLLARS: 1
NUMBER REQUIRED: 2 (From Plate 3.14-12) ___IL
DIMENSIONS: 3.5 ft.2 (From Plate 3.14-12)
FINAL DESIGN ELEVATIONS1 -I- -7- I
25.ELEVATIONS:
TOP OF DAM: 495.00 ft _IL
DESIGN HIGH WATER: 494.00 ft
EMERGENCY SPILLWAY CREST: 493.50 ft
PRINCIPAL SPILLWAY CREST: 492.50 ft
DEWATERING ORIFICE INVERT: 491.50 ft ---7
Page 2 90-3 SB.XLS
,
TEMPORARY SEDIMENT BASIN
PROJECT 1 90-3 1 PROJ NO. 7.0228
BASIN# F---- SEDIMENT BASIN SB-3 DATE 2011-11-07
,LOCATION T BY CWS
,DRAINAGE AREA _L 4.29 1 ac
BASIN VOLUME DESIGN --4 _i_.
WET STORAGE 1
1.MINIMUM REQUIRED VOLUME 287.43 icy_
2.AVAILABLEBASIN VOLUME 1
H 1 AVERAGE END AREA-BASIN VOLUME ESTIMATES i
ELEVATIO AREA __I VOLUME VOLUME TOTAL
1 123.00 4.56
504 4,900.00 4.56
11,881.00 440.04
7,590.50 281.13
507 8,200.00 725.72
20,200.00 748.15
1 509 12,000.00 1,473.87
REQUIRED WET STORAGE VOLUME 287.43 1cy
IAPPROX.ELEVATION 505.00
3.EXCAVATE CUBIC YARDSI _±7
4.AVAILABLE VOLUME BEFORE CLEANOUT REQUIRED 141.57'cy
15.ELEVATION CORRESPONDING TO CLEANOUT LEVE 504.301
6.DISTANCE FROM DEWATERING ORIFICE TO C/O LEVEL
I INVERT DEWATERING ORIFICE USED 505.301
APPROX.VOLUME AT INVERT USED T 310.14Icy
DISTANCE FROM INVERT TO C/O LEVEL 1.00;ft
DISTANCE ACCEPTABLE 1
WET STORAGE VOLUME ACCEPTABLE 1
DRY STORAGE 1 1
7.MINIMUM REQUIRED VOLUME 287.43,cy
8.TOTAL AVAILABLE VOLUME AT CREST OF RISER 1
CREST OF RISER F.-- 506.40,
APPROX.AVAILABLE TOTAL VOLUME 632.85 cy
ADEQUATE DRY STORAGE VOLUME
9.DIAMETER OF DEWATERING ORIFICE
10 0.39 cfs
10.DIAMETER OF FLEXIBLE TUBING , 6'in
1STANDARD SIZE
PRELIMINARY DESIGN i
11.PRELIMINARY DESIGN ELEVATIONS: I-
I CREST OF RISER 506.40 ft 1
TOP OF DAM 509.00 ft T
DESIGN HIGH WATER 508.00 ft *desi.n of hi.h water assumes a.eak flowrate
UPSTREAM TOE OF DAM 504.00 ft of 6.60 cfs storage volume is not considered.
Page 1 90-3 SB.XLS
'
TEMPORARY SEDIMENT BASIN
PROJECT 1 190-3 PROJ NO. 7.0228
BASIN# 1__ ISEDIMENT BASIN SB-3 DATE 2011-11-07
BASIN SHAPE
12.LENGTH OF FLOW/EFFECTIVE WIDTH: L L
L_SURFACE AREA OF NORMAL POOL 6200 sf
LENGTH OF FLOW PATH 85 ft
EFFECTIVE WIDTH 131 ft
RUNOFF 1
ARATIONAL METHOD CALCULATION)
USE MAXIMUM C VALUE DURING CONSTRUCTION AND MINIMUM Tc VALUE
13.FLOW FROM 2-YEAR STORM
14.FLOW FROM 25-YEAR STORM
PRINCIPAL SPILLWAY DESIGN
115.REQUIRED SPILLWAY CAPACITY:
EMERGENCY SPILLWAY?(Y/N) Y
REQUIRED SPILLWAY CAPACITY: 3.8 CFS ±
16.ASSUMED AVAILABLE HEAD:
ASSUMED AVAILABLE HEAD= 0.60 ft
17.RISER DIMENSIONS: 1
RISER DIAMETER: 18.00 (From Plate 3.14-8 or Calcs)
ACTUAL MAX.ELEV.: 508.00 ft (From Calcs if appropriate)
18.BARREL LENGTH: 1
BARREL LENGTH: 50.00 ft
BARREL INVERT OUT: 504.00 ft I
HEAD H ON BARREL: 4.00 ft (From Plate 3.14-7)
19.BARREL DIAMETER: I
-1 BARREL DIAMETER: 12 in _From Plate 3.14A or 3.1 B)
'20.TRASH RACK AND ANTI-VORTEX DEVICE:
DIAMETER: 27 in (From Plate 3.14D).
HEIGHT: 8 in
EMERGENCY SPILLWAY DESIGN T-
21.REQUIRED SPILLWAY CAPACITY: ,
22.DIMENSIONS: I I_
i BOTTOM WIDTH(b): 8.00 ft (From Table 3.14-C) L
SLOPE OF EXIT CHANNEL(s): 0.041ft/ft (From Table 3.14-C) I
MIN.LENGTH EXIT CHANNEL(x): 32.0011t_ (From Table 3.14-C) I I
ANTI-SEEP COLLAR DESIGN 1
23.DIMENSIONS: -
DEPTH WATER @ CREST OF P.S.(Y): 2.40 ft I
SLOPE UPSTREAM FACE DAM(Z): 3.00 :1 1
LENGTH BARREL IN SAT.ZONE(Ls): 5.00 ft (From Plate 3.14-11) I
24.NUMBER OF COLLARS: I
NUMBER REQUIRED: I(From Plate 3.14-12)
DIMENSIONS: 2.0 ft^2 (From Plate 3.14-12) 1
FINAL DESIGN ELEVATIONS I 1
25.ELEVATIONS: _i_
DESIGN HIGH WATER: 508.00 ft I
EMERGENCY SPILLWAY CREST: 507.40 ft 1
PRINCIPAL SPILLWAY CREST: 506.40 ft 1 i
DEWATERING ORIFICE INVERT: 505.30 ft ._1_ i
Page 2 90-3 SB.XLS
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