SW1190201_PLTS-STORMWATER-C4-REV_7/12/2019

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EX MH#2
RIM=2569.73
W 8" INV=2564.48
OLD 79 & 23 N.C.S. R. 7523
.a
AX-EA--B-JPOND-1
Area = 0.78 ac�-_,
5 = 0.46 ac
@.35�
+ Area -A (4.7 ac)
Total Pond DA = 5.48 ac
yl
WET POND WATERSHED
BOUNDARY, TYPICAL.
AREA -A TO POND-1
Area = 4.7 ac
@.95 = 2.62 ac
@.35 = 2.08 ac
+ Area-B (0.78)
Total Pond DA = 5.48
2
ACCESS AND MAINTENANCE EASEMENT
I TO BE SHOWN ON AS -BUILT PLAT FOR -
R RECORDATION. /w _
IF
WET POND WATERSHED
BOUNDARY, TYPICAL.
DRAINAGE AREA MAP
SCALE: 1 " = 50'
/w
R -
25 0 50
SCALE IN FEET
e iw
6' VEGETATIVE SHELF. 6:1 MAX SLOPE
CONTINUOUS AROUND MAIN POOL. 1,500
SQFT. TOTAL. SEE PLANTING SCH. BELOW.
VEGETATIVE SHELF PLANTING
QUANTITY NAME SPECIFICATION
125 LOBELIA CARDINALIS QUART CONTAINERS, DENSE
CARDINAL FLOWER & FULL, PLANTED 24" O.C.
125 RHYNCHOSPORA COLORATA QUART CONTAINERS, DENSE
STARRUSH WHITETOP & FULL, PLANTED 24" O.C.
125 SACCHARUM BALDWINII ART CONTAINERS, DENSE
NARROW PLUMEGRASS & ULL, PLANTED 24" O.C. b
0
MULCH SHELF AT TIME OF PLANTING WITH DBL. GROUND HARDWOOD BARK m
\ AND PROVIDE ONE-TIME FERTILIZATION OF PLA TS USING 18-46-0
MAIN POOL RIP -RAP WEIR PROTECTION
P.P.E. = 2561.00 SEE DETAIL BELOW
SURFACE AREA=5,208 SQFT.
BTM ELEV.=2556.50
CO-1, CONTROL
OUTLET STRUCTURE.
SEE DETAIL BELOW.
2557
C 2558
2559
2560
2563
2564
o M EMERGENCY SPILLWAY SEE
o m DETAIL ON SHEET C3.3.
A3
STABILIZE ALL BASIN SIDE SLOPES, ABOVE THE
P.P.E. (2561.00) WITH SEED, AS SPECIFIED AND
MAT, SC1508N, STAPLE PATTERN B, BY NORTH
AMERICAN GREEN OR APPROVED EQUIVALENT.
� Ssss
2ss�s
2563
256Ar
2565
6' VEGETATIVE SHELF. 6:1 MAX SLOPE
CONTINUOUS AROUND MAIN POOL. 1,500
SQFT. TOTAL. SEE PLANTING SCH. ABOVE.
ACCESS AND MAINTENANCE EASEMENT
TO BE SHOWN ON AS -BUILT PLAT FOR
RECORDATION.
ENLARGED WET POND
SCALE: 1 " = 10'
40.00'
FOREBAY /
SEDIMENT CHAMBER
P.P.E = 2561.00
N
N
5 0 10
SCALE IN FEET
CO-1, OUTLET CONTROL STRUCTURE
12"
DEPTH
RIP -RAP
to :!5=
6' VEGETATIVE
W/ FRAME AND GRATE. SEE
STILLING WEIR. d50=6"
a
SHELF. MAX
STRUCTURE SCH. ON C2.5
2565
0
°
2565
SLOPE 6:1
0
FE
IM 4.00
to
PROPOSED SURFACE.
QUALITY CONTROL CALCULATIONS
3'MIN.
LO
_ _
_ _ _ _ _ _ _ _
_ EL. 2562.50 _ _ _
_ _ _ T_EM_P._P_00_L _EL. 2_56_2._50_ _ _ _ _
_ _ _ _ _ _ _ _
_ _
_ _ _ _ _
_ _ _ _
_ _ _ _
_ _ _
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
_ _ _ _ _ _ _ _ _ _ _ _
_ _
INLET PIPE W/
RV = 0.05 + 0.9 X IA
LO N
a ��
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EXISTING SURFACE
L. 2561.00
EE PLAN
PERM. POOL EL. 2561.00
EL. 2565 00
WHERE RV = RUNOFF COEFFICIENT (STORM RUNOFF (IN) / STORM
N /
RAINFALL (IN)), UNITLESS
N
-FOREBAY
IA = IMPERVIOUS FRACTION (IMPERVIOUS PORTION OF DRAINAGE AREA
2560
� Z
2560
PRIMARY 24" HDPE
2
2
(AC) / DRAINAGE AREA (AC))
OUTLET PIPE
2
1
1
ro
2
PROPERTY AT BUILD-OUT:RV = 0.05 + 0.9 (3.08 / 5.48)
1 SEDIMENT STORAGE EL. 2557.00
SEDIMENT STORAGE EL. 2558.50
1
RV = 0.56
BTM. EL. 2556.50
EL. 2557.50
AND WQV = 3630 X RD X RV X A
EL 2558.00
WHERE WQV = FILTRATION VOLUME (CUBIC FEET)
RD = DESIGN STORM RAINFALL DEPTH (IN) 1.0 FOR CLYDE
F OF "
III
A = WATERSHED AREA (AC)
H54
DPE�
1-3/4" SCH.
40 TEE SECTION. OPEN
1.01
BOTTOM, PLUG
TOP W/ NIPPLE INTO
WATERSHED: WQV = 3630 X 1.00 X 0.56 X 5.48
2555
2555
STRUCTURE AT
EL. 2561.00
WQV = 11,140 CF
SECURE TO BOX AS NECESSARY.
WET
POND D E TA I L
EXISTING SUBGRADE
- - - - - - - - -
SCALE: NOT TO SCALE
STORMWATER MANAGEMENT CONSTRUCTION
CONSTRUCTION SEQUENCE
1. CONVERSION OF THE SKIMMER BASIN TO THE WET POND SHOULD ONLY OCCUR DURING A PERIOD OF EXTEND DRY WEATHER WHEN THERE IS NO STANDING WATER IN THE SKIMMER BASIN.
2. STABILIZE ALL DISTURBED AREAS UPSTREAM OF THE WET POND. *WET POND SHOULD NOT BE CONSTRUCTED UNTIL FINAL PAVING AND LANDSCAPING IS COMPLETE. GENERALLY, IT SHOULD
BE THE FINAL SITE CONSTRUCTION ACTIVITY THAT TAKES PLACE. ALL CONTRIBUTING AREAS WITHIN THE WATERSHED SHOULD BE STABLE AND APPROVED BY LANDSCAPE ARCHITECT.*
3. DIVERT PIPE AND CHANNEL RUNOFF FROM BASIN WORK AREA USING TEMPORARY PIPES AND DIVERSIONS, AS NECESSARY
4. THE WET POND IS A CONVERTED SEDIMENT BASIN. ALL OUTLET STRUCTURES AND PIPES SHOULD ALREADY BE IN -PLACE.
5. PROTECT BASIN SLOPES, EXCEPT AT SINGLE ACCESS POINT FOR EQUIPMENT.
6. PROTECT ACCESS ROUTE INTO BASIN WITH HEAVY-DUTY GEO-TECHNICAL FABRIC AND PLANKS IF NECESSARY.
7. INSTALL VEGETATION ON VEGETATIVE SHELF.
8. COMPLETE SLOPE STABILIZATION AND REPAIRS.
9. INSPECT BASIN AFTER SEVERAL RAIN EVENTS TO VERIFY IF IT IS FUNCTIONING EFFECTIVELY; IF IT IS NOT, MAKE REPAIRS. CRITERIA THAT THE BASIN IS WORKING PROPERLY SHALL INCLUDE
BUT NOT BE LIMITED TO, NO WEEPING FROM EARTHEN DIKES, PROPER DEWATERING TIME AS PRESCRIBED BY DEQ ON THIS SHEET, AND NO EXCESSIVE SEDIMENTATION DEPOSITION.
DRAINAGE / ACCESS / INSPECTION EASEMENTS ARE REQUIRED FOR ALL STORMWATER MANAGEMENT FACILITIES. IN ADDITION TO AS -BUILT SURVEYS. EASEMENTS CONNECTING TO PUBLIC RIGHTS
OF WAY SHALL BE SHOWN FOR THE WET POND.
AS -BUILT SURVEYS SHALL BE SUBMITTED TO THE LANDSCAPE ARCHITECT AT CLOSE-OUT FOR REVIEW AND CERTIFICATION.
WET POND SIZING CALCULATIONS
AVERAGE DEPTH
D avg = VOLUME OF MAIN POOL / SURFACE AREA
16,741 CF / 5,208 SF
SA = DRAINAGE AREA (SF) X SA/DA RATIO / 100
238,709 SF X 2.09 (60% IMPERVIOUS FOR 3' D avg) _
498,901 / 100 = 4.989 SF
AS DESIGNED, THE MAIN POOL HAS A SURFACE AREA OF 5,208 AT
ELEVATION 2561.00 AND A MAIN POOL CAPACITY OF 16,741 CF AT 4'
DEPTH.
FOREBAY
15%-20% OF MAIN POOL VOLUME = 2,511 CF - 3,348 CF
4,243 CF PROVIDED BETWEEN EL. 2558.5 & 2561.0
2550
-0+ 1®+00
1610 to] Weill II a
0+60
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ISSUED FOR: DATE: BY: J
REVIEW 02/25/19 RDH w
APPROVAL 05/21/19 RDH
APPROVAL 07/08/19 RDH =
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