HomeMy WebLinkAboutSW1210902_Plansheet - SCM Detail_20211124J
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DA 3
SAND FILTER
DA= 6.27 AC
AUNUIN I E UI�IVL�
60' R/W AND VARIABLE WIDTH R/W
DRAINAGE AREA MAP
SCALE: 1 "=80'
DA 7
DITCH CALCULATIONS
DITCH
DIMENSIONS
Q10 (CFS)
V (FT/S)
DEPTH (FT)
STABILIZATION
SHAPE: TRAPEZOIDAL
DITCH-1A
BOTTOM WIDTH=2'
2.67
1.51
0.37
SOD
MIN. VERT. DEPTH=1.0'
SHAPE: TRAPEZOIDAL
DITCH-1 B
BOTTOM WIDTH=2'
6.33
2.30
0.68
SOD
MIN. VERT. DEPTH=2.0'
SHAPE: TRAPEZOIDAL
DITCH-1 C
BOTTOM WIDTH=2'
5.90
2.34
0.68
SOD
MIN. VERT. DEPTH=3'
SHAPE: TRAPEZOIDAL
DITCH-2
BOTTOM WIDTH=2'
24.76
5.92
1.03
SOD
MIN. VERT. DEPTH=3
SHAPE: TRIANGULAR
EXISTING DIVERSION DITCH
MIN. VERT. DEPTH=1.2'
24.76
7.21
1.07
N/A
AVE. SIDE SLOPE=3:1
DRAINAGE AREA TABLE
DA
RECIEVING STORM
SYSTEM
ON -SITE
AREA (AC)
OFF -SITE
AREA (AC)
TOTAL
AREA (AC)
CN
ToC (MIN)
Q10 (CFS)
Q25 (CFS)
DA-1
TRENCH DRAIN
0.13
0.00
0.13
98.00
5.00
0.90
1.07
DA-2
CI-2.4
0.99
0.00
0.99
96.00
5.00
7.35
8.70
DA-3
CI-2.3
0.51
0.00
0.51
92.00
5.00
3.61
4.32
DA-4
DITCH-1 C
1.77
0.00
1.77
80.00
19.10
5.90
7.49
DA-5
DITCH-1 B
1.59
0.00
1.59
82.00
14.70
6.33
7.99
DA-6
D ITCH-1 A
0.47
0.00
0.47
87.00
7.10
2.67
3.27
DA-7
EXIST. 18" CMP
0.00
25.20
25.20
62.00
33.90
26.41
38.85
DA-8
EXISTING DRAINAGE DITCH
0.67
25.20
25.87
62.00
33.90
24.76
36.90
DA-9
EXISTING STREAM
0.20
26.50
26.70
61.00
37.90
24.52
36.57
Know what's below.
Call before you dig.
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SW 36" INV=20
Fw
RIM =2059.53 �
SW 18" INV=2049.26I
S 10" INV=2057.00
E 24" INV=2049.22
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PROPOSED IMPACTS -
STREAM 1
(88.4 LF/0.006 AC)�
78 LF OF 36" HDPE_
N-12 WT ST ® 2.15%
HW-1-
NE 36" INV=2051.28
FES-1
W 24" INV=2049.00
�Fw
Fw
44 LF OF 24" HDPE
N-12 WT ST ® 0.50%
` 6 LF OF 10" HDPE
N-12 WT ST ® 2.00\/% /
0' �TIR(ELHIDRAIN
IISEE
NCDOT DETAIL 840.30
I ON SHEET C2.4.
II ,�
2060
58 LF OF 18" HDPE
N-12 WT ST ® 0.50%
205 I I I I I ! I I' I I
BENCHED FILL SLOPE.
2:1 MAX. SEED AND
STABILIZE AS SPECIFIED.
EXISTING BYPASS
SWALE, TO REMAIN.
ENLARGED VIEW: TRUCK ENTRANCE
SCALE: 1 "=20'
STUB 4" SCH. 40 PVC UNDERDRAIN
INTO OUTLET CONTROL STRUCTURE.
4" STUB SERVES AS CONTROL
ORIFICE. INV. ELEV = 2056.50
COMPACTED SUBGRADE
Fw �
FES-2
SW 24" INV=2052.00i
12' WIDTH RIP -RAP EMERGENCY
SPILLWAY. D50=8". INSTALL TO 16"
DEPTH OVER MIRAFI 140N EC FABRIC.
64 LF OF 24" HDPE
-12WTST® 2.00%
_� OLpZ LO
5 co
N co
2070.00 0 0
FG OCS-2.1
RIM=2062.50
2070 SE 4" INV=2056.50
NE 24" INV 20 3.28
SANDFILTER. SEE DETAIL
BELOW 1,823 SF. MIN.
090Z
/ 10' MIN. WIDTH ACCESS
/ / MAINTENANCE BERM. \
ggpZ
2065.00
FG
2065.00 �n65
• � (I1 �rff �rf1 �I�����j�+� I��%'�I
A
206�.4� I \ / I 2064.0
272 LF OF 18" HDPE J 2064.07
N-12 WT ST @ 0.50% - 2:1 SIDE SLOPES. STABILIZE _ CI-2.3
W/ SOD, CONTINUOUS AROUND
- SIDES & TOP OF BERM. RIM=2064.07
= NW 18" INV=2059.57
�ssoz- SW 15" INV=2059.59 /
AF
NE 24" INV=2059.55
_
ENLARGED VIEW: SAND FILTER
SCALE: 1 "=20'
SAND FILTER DETAIL
SCALE: NOT TO SCALE
- LINE BOTTOM AND SIDES OF SAND
FILTER CHAMBER AND RIP -RAP
FOREBAY W/ NON -WOVEN
SOIL SEPARATING FABRIC.
6" DEPTH J" WASHED STONE W/ 4"
SLOTTED PVC UNDER -DRAIN CENTERED
W/N STONE BED. SEE PLAN. PROVIDE TEE
SECTION AND CLEANOUT STANDPIPES AT
THE END OF EACH RUN.
UALITY CONTROL CALCS.
RV = 0.05 + 0.9 X IA
WHERE RV = RUNOFF COEFFICIENT
(STORM RUNOFF (IN) /
STORM RAINFALL (IN)), UNITLESS
IA = IMPERVIOUS FRACTION
(IMPERVIOUS PORTION OF DRAINAGE
AREA (AC) / DRAINAGE AREA (AC))
DRAINAGE AREA AT BUILD -OUT:
RV=0.05+0.9 (5.13/6.27)
RV = 0.786
AND WQV = 3630 X RD X RV X A
WHERE WQV = FILTRATION VOLUME (CUBIC FEET)
RD = DESIGN STORM RAINFALL DEPTH (IN) 1.0
FOR
MILLS RIVER
A = WATERSHED AREA (AC)
DRAINAGE AREA: WQV = 3630 X 1.00 X 0.786 X 6.27
WQV = 17.889 CF
ADJUSTMENT FOR SAND FILTER = WQV X 0.75 = 13.417
CF
SURFACE AREA REQUIREMENT AT 4' AVG. DEPTH = 3,354
SF.
PROPOSED = 3,646 SF. (1,823 FOREBAY & 1,823 SAND
FILTER)
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