08_HPSC8251

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BASIN NAME BASIN #3
BASIN TYPE SKIMMER
TOTAL DRAINAGE AREA 3.90 acres
To (TIME OF CONCENTRATION) 5 min
eb,
C VALUE 0,45
1(25 YEAR STORM) 7,67 in/hr
CLASS 'A' DISSIPATER -4
PAD; 4'W X 51 X 18"TH SURFACE AREA CALCULATION:
Q25-CIA 13 cfs
SURFACE AREA (AC) = 325 SF Q25 (CFS)
SILT FENCE STONE MSURFACE AREA REQUIRED 4,375 ft'
SURFACE AREA PROVIDED 4,608 ftf
OUTLET (TYP.)
52 LF OF 4" PVC PIPE 00
ON BASIN VOLUME CALCULATION;
INV. OUT = 654.7'o <
z BASIN VOLUME DESIGN,. = 1,800 ft/acre
LIMITS OF DISTURBANCE r 5:1 SLOPE BASIN VOLUME REQUIRED 7,020 It
BASIN VOLUME PROVIDED 7,596 It-'
AL� 1�'4201
TOP OF EMBANKMENT ELEVATION 659.0 If
is is— is 0\ 2,0. 11 o, EMBANKMENT WIDTH 5 It
EMERGENCY SPILLWAY ELEVATION 658.0 It
EMERGENCY SPILLWAY WIDTH 15 ft
SILT FENCE BOTTOM ELEVATION 656.0 It
E�
%
BASIN DEPTH 2 ft
BOTTOM OF SEDIMENT STORAGE @
ELEV. =
656 655.0 It
SKIMMER PROVIDE 3 BAFFLES
SKIMMER SIZE
2 inch
659 ORIFICE DIAMETER 1,5 inch
659 '1 DEWATERING TIME 3.31 days
TOP OF
COIR FIBER BAFFLES (TYP. OF 3) *USE FAIRCLOTH SKIMMER
W
655 WN
• LUL ,
EMERGENCY SPILLWAY
CLASS "B" RIPRAP AND
NON -WOVEN FILTER FABRIC
0
0 14
0)
3:1 SLOPE
LL
655
656
-0 " 60
662 -AS F-7777
DIVERSION DITCH #313
C_
SEE EROSION CONTROL
PLAN FOR CONTINUATION
DIVERSION DITCH #3A IL OF DIVERSION DITCH
BASIN INLET ENERGY DISSIPATER
CLASS "A" RIPRAP,
MIN. 24'W X 241 X 18"TH UNDERLAIN WITH FILTER FABRIC
TEMPORARY SEDIMENT BASIN #3 ENLARGEMENT
BASIN'' NAME BASIN #4
BASIN TYPE SKIMMER
TOTAL DRAINAGE AREA 1.33 acres
To (TIME OF CONCENTRATION) 5 min
C VALUE 0A5
1(25 YEAR STORM) 7,67 in/hr
SURFACE AREA CALCULATION:
Q25 = CIA 5 cfs
SURFACE AREA (AC) = 325 SF Q25 (CFS)
SURFACE AREA REQUIRED 1,492 It
SURFACE AREA PROVIDED 2,450 ft' 4 I I I I i I CY)
00
BASIN VOLUME CALCULATION- 0
z
BASIN VOLUME DESIGN = 1,800 ft/acre
BASIN VOLUME REQUIRED 2,394 It It tI
(BASIN VOLUME PROVIDED 3,748 It'
SCALE I "=20-
TOP OF EMBANKMENT ELEVATION 675.0 ft
EMBANKMENT WIDTH 5 ft 0 1 20, 40'
EMERGENCY SPILLWAY ELEVATION 674,0 ft
EMERGENCY SPILLWAY WIDTH 5 ft
BOTTOM ELEVATION 672.0 ft
BASIN DEPTH 2 It
66TTom OF SEDIMENT STORAGE @
A
ELEV, = 671.0 It
ve
PROVIDE 3 BAFFLES
10,
SKIMMER SIZE 1,5 inch
ORIFICE DIAMETER 1 inch DIVERSION DITCH #4A
DEWATERING TIME 2.93 days
BASIN INLET ENERGY DISSIPATER
*USE FAIRCLOTH SKIMMER CLASS "A" RIPRAP; MIN. 221 X 15'W X 18"TH
SILT FENCE Al
UNDERLAIN WITH FILTER FABRIC
" MCI
Ole"
Tx
3:1 SLOPE
COIR FIBER BAFFLES (TYP. OF 3)
4t CO
6'
6,
0
—DIVERSION DITCH #4B
LIMITS OF DISTURBANCE SEE EROSION CONTROL
PLAN FOR CONTINUATION
y `y ( \o OF DIVERSION DITCH
N
\1 SKIMMER
51 SLOPE
6'
Ilk EMERGENCY SPILLWAY
CLASS "B" RIPRAP AND
NON -WOVEN FILTER FABRIC
SILT FENCE STONE 51 LF OF 4" PVC PIPE
OUTLET (TYP.) INV. OUT = 670.9'
CLASS 'A' DISSIPATER
PAD; 4'W X 51 X 18"TH
TEMPORARY SEDIMENT BASIN #4 ENLARGEMENT
CD
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FRESHWATER
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DIVERSION DITCH A . .... . 6&1 I FRESHWATER
DIVER
SION DITCH A
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0
DRIVE PHASE 1
DRIVE PHASE 2
SCALE 1"=40'
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0 40' 80'
EROSION
CONTROL LEGEND
"I , ", , LIMITS OF DISTURBANCE
_SF —SF —SF
SILT FENCE
XX XX
NCDOT SPECIAL SILT FENCE
TPF TPF TEMP, TREE PROTECTION FENCE
POROUS BAFFLE
— - ------
TEMPORARY DIVERSION DITCH
SILT FENCE STONE OUTLET
EMERGENCY SPILLWAY / RIP RAP
APRON
CHECK DAM
HORSESHOE INLET PROTECTION
FE—A
TEMP. CONSTRUCTION ENTRANCE
CONCRETE WASHOUT
SKIMMER
IkLL CONSTRUCTION SHALL BE IN ACCORDANCE WITH CASWELL COUNTY
NCDEQ AND NCDOT STANDARDS, SPECIFICATIONS, AND DETAILS
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