20221191 Ver 1_0007-504-WET POND PLAN_20220831

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PROPOSED RCA AREA
*1**** At*
PROPOSED RCA
AREA TO REPLACE
BUFFER IMPACT
#4 BARS - WELDED IN
SYMMETRICAL PATTERN
(WITH HATCH FOR ACCESS)
RISER STRUCTURE
4020' TOA -SCM
MAINTENANCE AND
407ACCESS EASEMENT
N
425.50
�r� r'w 425
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5'-4"
TRASH GUARD
NOT TO SCALE
STORMWATER MANAGEMENT
SUMMARY - OUTLET POINT 1
RETURN
EVENT
(YR)
PRE-DEV.
RELEASE
RATE (CFS)
POST-DEV.
RELEASE
RATE (CFS)
1
6.23
4.50
10
20.91
20.69
100
36.89
25.21
WET DETENTION POND: BASIN SIZING, CALCULATIONS, AND REQUIREMENTS
REQUIRED SURFACE AREA FOR PERMANENT POOL
TOTAL DRAINAGE AREA TO BASIN: 15.3 AC
IMPERVIOUS AREA DRAINING TO BASIN: 11.7 AC
PERCENT OF IMPERVIOUS FOR DRAINAGE AREA: 76.5%
PERMANENT POOL AVERAGE DEPTH: 3.7 FT.
SURFACE AREA/DRAINAGE AREA RATIO (SA/DA): 2.41
REQUIRED SURFACE AREA: SA = (2.41/100)*(15.3 AC)*(43,560 SF/AC)
= 16,062 SF
PROVIDED SURFACE AREA: SA = 22,017 SF
SURFACE AREA PROVIDED > SURFACE AREA REQUIRED
22,017 SF > 16,062 SF
REQUIRED VOLUME TO CONTROL THE 1" STORM
RUNOFF COEFFICIENT (RV): STORM RUNOFF (IN) / STORM RAINFALL (IN)
PERCENT IMPERVIOUS (I): DRAINAGE AREA (AC) / IMPERVIOUS PORTION OF DA (AC.)
RV = 0.05 + .009 * (I)
= 0.05 + .009 * (76.5)
= 0.738 IN/IN
REQ. VOL. FROM 1" OF RUNOFF= (DESIGN RAINFALL) * (RV) * (DRAINAGE AREA)
_ (1" )*(0.738 IN/IN)*(15.3 AC)*(43,560 SF/AC)*(1FT/121N )
= 41,001 CF
* VOLUME FROM 1-INCH PROVIDED BETWEEN ELEVATIONS 409.00 AND 410.30
PROVIDED VOLUME FROM 1" OF RUNOFF = 43,864 CF
VOLUME PROVIDED > VOLUME REQUIRED
43,864 CF > 41,001 CF
TOWN OF APEX SCM REQUIREMENTS
REQUIREMENT: THE POST -DEVELOPMENT PEAK RUNOFF RATE SHALL BE LIMITED TO
THE PRE -DEVELOPMENT PEAK RUNOFF RATE FOR THE 1-YEAR, 24-HOUR AND THE
10-YEAR, 24-HOUR STORMS. SCMS SHALL BE DESIGNED TO REMOVE 85% OF TOTAL
SUSPENDED SOLIDS IN THE PERMANENT POOL AND STORE RUNOFF FROM A ONE-(1)
INCH RAINFALL FROM THE SITE ABOVE THE PERMANENT POOL. THE DISCHARGE RATE
FROM THE SCM SYSTEM FOLLOWING THE ONE- (1) INCH RAINFALL DESIGN STORM
SHALL BE SUCH THAT THE RUNOFF DOES NOT DRAW DOWN TO THE PERMANENT POOL
LEVEL IN LESS THAN TWO (2) DAYS AND THAT THE POND IS DRAWN DOWN TO THE
PERMANENT POOL LEVEL WITHIN AT LEAST FIVE (5) DAYS
GRAPHIC SCALE
15 30 60
1 inch = 30 feet
38'
4'
20'
4'.
VARIES
'415.00»
TOP OF-
BANK
'TOP OF
•BANK
415.00 `
L SOD
VARIES
0
0
mCO
O m
m
4'
415.00 I
20'
414.00
4'
415.00
BASIN EMERGENCY SPILLWAY
N
2'-0"
NO SCALE
4'-0"
/8,
2'-0"
0
8" PVC ORIFICE
FOR 2-5 DAY
DRAWDOWN
6"HX18"W
ORIFICE
0
N
3000 PSI RE-INF..
CONCRETE RISER
• STRUCTURE
PLAN VIEW OF RISE STRUCTURE
NOT TO SCALE
3000 PSI REINF.
CONCRETE FOOTING
15" RCP
PROVIDE STANDARD MANHOLE
STEPS ON INSIDE WALL OF
RISER AS SHOWN
420
IL'
425.99
425.00
-- 410--
402
20' TOA SCM __- ------
MAINTENANCE AND
408 402--_ ACCESS EASEMENT
- 406 Kj
_408 -
- ---- 410 ®s�O� ►� �ic.� 'PAW �'
♦WIC N�N�VZ
4004415
425.98
425.00
409
.411
11
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RIP-RAP
DISSIPATER SEE
THIS SHEET FOR
DETAILS
RIP -RAP SWALE
36" RCP PIPE
W/ HEADWALL
6' AQUATIC SHELF
SEE PLANTING
DETAIL, THIS SHEET
10 YR. STORM ELEV. = 412.58
40TOA PUBLIC
SANITARY SEWER
EASEMENT
5' PARKING
SETBACK
408
1 /
__-
50' NEUSE
RIVER BUFFER
4040410#4444'
#444 4##
A "4444 eir*
Vet- "Mr,
444*
MIX B
MIX C ir#4441%
MIX D
TOP OF BERM ELEV. = 415.00
(3) PE VI
(3) IR VI
(2) JU EF
(3) AS IN
(2) CA TE
397
__376
_ g5
STEEP SLOPE
STABILIZATION SEE -__---- -
SHEET C.4.2 FOR
10' BUILDING
SPECIFICATIONS SETBACK �3g2"
(2) SA LA
\
(3) PO CO
(3) LO CA
(2) LO EL
TYPICAL AQUATIC SHELF PLANTING LAYOUT
SCALE: NTS
(2) SA LA
(3) CA TE
TOP OF RISER = 412.20
•
1 YR. STORM ELEV. = 410.98
(1) 6"Hx18"W ORIFICE INV. ELEV. = 410.30 8" ORIFICE & 90' BEND
INV. ELEV. = 409.00
PERMANENT POOL = 409.00
BOTTOM OF POND - 402.00
VERTICAL REINFORCING
#8 BARS 0 8" 0.C.E.W.
25' - 8" I.D. POND
DRAIN W/ MESH SCREEN
INVERT = 403.00
WATERTIGHT
RUBBER BOOT
-111-111E11-111E11-ICI-III-III-111-1 I
III=III=III=III=III-1 1=111-1 1 1-1 1 1-1 1
III=III=III=
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1�II�11�II�11I-I�1-1�I111-111-I11-1
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11-1 1 1-1 1 I -I 1 1-1 1 I -I 1 1-1 1 I -I 1 1-1 I II 111
11 = 111E111E111-1111 1 1-I 1 I N
11-111111E111-1I1-1H1-�=
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COMPACTED
SUBGRADE
HORIZONTAL REINFORCING
#4 BARS Q 8" 0.C.E.W.
16"
TYP.
VALVE STEM
SUPPORTS
8" PLUG VALVE:
INV.=402.70
GROUT
WET DETENTION POND OUTLET ST
L
3
(2) LO SI
NOTE: 3
BERMUDA SOD IS REQUIRED FOR
VEGETATED SIDE SLOPES AND THE
TOP OF DAM OF THE SCM.
3000 PSI REINF.
CONCRETE RISER
STRUCTURE
PROVIDE STANDARD MANHOLE
STEPS ON INSIDE WALL OF
RISER AS SHOWN
110 LF OF 15" DIA. "0" RING
JOINT RCP OUTLET PIPE @ 10.0%
- 398.00
-1
TOP OF FOOTING ELEVATION: 398.00
3000 PSI REINF.
CONCRETE FOOTING
UCTURE SECTION
NOT TO SCALE
TOP RISER = 412.20
(1) 6"Hx18"W ORIFICE
INV. ELEV. = 410.30
8" DIAMETER ORIFICE ELEV = 409.00
100-YEAR ELEVATION = 413.93
10-YEAR ELEVATION = 412.58
TEMPORARY POOL ELEVATION = 410.30
3
T1
PERMANENT POOL ELEVATION = 409.00 p
SEDIMENT STORAGE - 403.00
BOTTOM OF POND - 402.00
8" I.D. PVC PIPE WITH
90' BEND 3
INVERT = 403.00
25' - 8" I.D. POND
DRAIN W/ MESH SCREEN
WATERTIGHT RUBBER BOOT
8" PLUG VALVE
INVERT = 402.70
BERM ELEVATION 415.00
1[
WET DETENTIO\ PO\D SECTION
NOT TO SCALE
3
10'
6' AQUATIC SHELF
SEE PLANTING
DETAIL, THIS SHEET
PRE -CAST CONC. BASE
SEE OUTLET STRUCTURE DETAIL
VALVE STEM SUPPORTS
INVERT = 398.00'
110 LF OF 15" DIA. "0"
RING JOINT RCP © 10.0%
ANTI -SEEP COLLAR
7' SQ x 12" THICK
CONCRETE
(POURED -IN -PLACE)
a
LOW SIDE OF SHELF
408.5
6' AQUATIC SHELF
HIGH SIDE OF SHELF
409.5
NOTE:
BERMUDA SOD IS REQUIRED FOR
VEGETATED SIDE SLOPES AND THE
TOP OF DAM OF THE SCM.
OUTLET INVERT = 388.0'
7
3.75'
NOTE:
CD
)
20.25
RAP PLA\ VIEW (HW-2
PROVIDE KEYED IN FILTER FABRIC
UNDERNEATH RIP RAP
OUTLET PIPE
AP SECTI
NOT
NOT TO SCALE
SCALE
RIPRAP APRON
CLASS 2 STONE
DMAX = 15"
APRON THICKNESS = 22"
22"
CODE
QTY.
BOT. NAME / COMMON NAME
SIZE
COND
SPACING
MIX A
EMERGENT DEEP (6"-3" BELOW WATER LEVEL)
Arrow Arum
Field Locate
Broad -Leaf Arrowhead
Field Locate
Pickerel Weed
Field Locate
MIX B
EMERGENT SHALLOW (3"-0" BELOW WATER LEVEL)
Blue Flag Iris
Field Locate
Common Rush
Field Locate
Broad -Leaf Arrowhead
Field Locate
MIX C
EDGE (0"-3" ABOVE WATER LEVEL)
Swamp Milkweed
Field Locate
Quill Sedge
Field Locate
LO EL
93
Lobelia Elongata
18"
plug
24" o.c.
Longleaf Lobelia
Field Locate
MIX D
SATURATED (3"-6" ABOVE WATER LEVEL)
CA TE
93
Carex Tenera
18"
plug
24" o.c.
Quill Sedge
Field Locate
LO CA
140
Lobelia cardinalis
18"
plug
24" o.c.
Cardinal Flower
Field Locate
LO SI
93
Lobelia siphilitica
24"
plug
24" o.c.
Great Blue Lobelia
Field Locate
NOTE:
1. SIZE INDICATED AT TIME OF PLANTING.
2. BERMUDA SOD IS REQUIRED FOR VEGETATED SIDE
SLOPES AND THE TOP OF DAM OF THE SCM.
CHICHNO
1411116
GRASS LEGEND
PROPOSED SOD AREAS
PROPOSED SEED at MATTING AREAS
STEEP SLOPE STABILIZATION
The signatures affixed below certify that this sheet has been reviewed and approved solely per
the certifications signed on the cover sheet of these construction plans.
Public Works -Transportation
Building Inspections
Water Resources - Utility Engineering
Electric
Water Resources -Soil & Erosion Control
Water Resources -Stormwater
Planning
Fire
Parks, Recreation & Cultural Resources
PLAN PREPARED BY: F
PLAN PREPARED FO
o
o
o
919.481.6290
CL
BEACON
PARTN ERS
919.336.5127
cip
Charibilr. Moms Grains UM
cm, 744,597,7757
0
cn
0
0
03
Date: 05/18/2022
Scale: AS NOTED
07/05/2022 — Town Submittal Rev
Drawn By:
JLB
Checked By:
JDW
Project Number:
20-0007-504
Drawing Number:
C.5.3