20151256 Ver 1_C_10_0 WET POND PLAN_20170119

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0 PD ___ - GRAPHIC SCALE o V
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--_y •..• ___--- ----`- so 0 15 30 60 120 1. PLACEMENT OF ANY FILL MATERIAL MUST BE CONDUCTED UNDER U
THE OBSERVATION OF A QUALIFIED LICENSED GEOTECHNICAL ENGINEER M J
AND UPON COMPLETION OF THE EARTHWORK ACTIVITIES THE TOWN o
MUST BE PROVIDED WITH A FINAL GRADING REPORT THAT INCLUDES
SCALE: NTS
CODE
QTY.
20'
SIZE
COND
SPACING
1
4) SA LA
(3) PO CO
MIX A
EMERGENT DEEP (6"-3" BELOW WATER LEVEL)
PE VI
(3) PE
Peltandra virginica
LOW SIDE OF SHELF
MIX
A
98.05
(3) SA LA
249.00
MIX
B
(4) IR
SA LA
176
MIX
C
(3) JU EF
(3) CA TE
6' AQUATIC SHELF
MIX
D
(3) AS I
JJJ
J
Field Locate
PO CO
132
Pontederia cordata
9"
HIGH SIDE OF SHELF
24" o.c.
(3) CA TE
Pickerel Weed
250.00
_
Field Locate
(3) LO SI
(4) LO CA
36" RCP-
MIX B
EMERGENT SHALLOW (3"-0" BELOW WATER LEVEL)
(4) LQ EL
176
Iris virginica
18"
plug
TYPICAL AQUATIC SHELF PLANTING LAYOUT
o
SCALE: NTS
CODE
QTY.
BOT. NAME / COMMON NAME
SIZE
COND
SPACING
1
14.67
10.69
MIX A
EMERGENT DEEP (6"-3" BELOW WATER LEVEL)
PE VI
132
Peltandra virginica
18"
plug
24" o.c.
98.05
67.43
Arrow Arum
254.09
100
Field Locate
SA LA
176
Sagittaria latifolia
9"
plug
24" o.c.
H
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ry
Broad -Leaf Arrowhead
CO
Q
JJJ
J
Field Locate
PO CO
132
Pontederia cordata
9"
plug
24" o.c.
LL.
Z
Pickerel Weed
_
Field Locate
0.
36" RCP-
MIX B
EMERGENT SHALLOW (3"-0" BELOW WATER LEVEL)
IR VI
176
Iris virginica
18"
plug
24" o.c.
o
6" ID ORIFICE
Blue Flag Iris
v-
Field Locate
JU EF
132
Juncus effusus
9"
plug
24" o.c.
U
11=1 11=1 I I=1
Common Rush
Field Locate
SA LA
132
Sagittaria latifolia
9"
plug
24" o.c.
ai
Broad -Leaf Arrowhead
III =' TOP OF FOOTING ELEVATION: 242.50
Field Locate
e a
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a ° .. A ."a d
MIX C
EDGE (0"-3" ABOVE WATER LEVEL)
AS IN
132
Asclepias incarnata
24"
plug
24" o.c.
Swamp Milkweed
CONCRETE RISER
Field Locate
CA TE
132
Carex Tenera
18"
plug
24" o.c.
x
x
Quill Sedge
Field Locate
LO EL
176
Lobelia Elongato
18"
plug
24" o.c.
N
Longleaf Lobelia
Field Locate
N
V)
MIX D
SATURATED (3"-6" ABOVE WATER LEVEL)
CA TE
132
Carex Tenera
18"
plug
24" o.c.
Quill Sedge
o
Field Locate
LO CA
176
Lobelia cardinalis
18"
plug
24" o.c.
Cardinal Flower
Field Locate
LO SI
132
Lobelia siphilitica
24"
plug
24" o.c.
Great Blue Lobelia
Field Locate
NOTE: SIZE INDICATED AT TIME OF PLANTING.
WET DETENTION POND: BASIN SIZING, CALCULATIONS, AND REQUIREMENTS
FACE AREA FOR PERMANENT
TOTAL DRAINAGE AREA TO BASIN: 18.84 AC
IMPERVIOUS AREA DRAINING TO BASIN: 14.49 AC
PERCENT OF IMPERVIOUS FOR DRAINAGE AREA: 76.9%
PERMANENT POOL AVERAGE DEPTH: 4 FT.
SURFACE AREA/DRAINAGE AREA RATIO (SA/DA): 3.65
REQUIRED SURFACE AREA: SA =(3.65/100)*(18.84 AC)*(43,560 SF/AC)
= 29,954 SF
PROVIDED SURFACE AREA: SA = 31,946 SF
SURFACE AREA PROVIDED > SURFACE AREA REQUIRED
31,946 SF > 29,954 SF
REQUIRED VOLUME TO CONTROL THE 1" STORM
RUNOFF COEFFICIENT (RV): STORM RUNOFF (IN) / STORM RAINFALL (IN)
PERCENT IMPERVIOUS (1): DRAINAGE AREA (AC) / IMPERVIOUS PORTION OF DA (AC.)
RV = 0.05 + .009 * (1)
= 0.05 + .009 * (76.9)
= 0.742 IN/IN
REQ. VOL. FROM 1" OF RUNOFF= (DESIGN RAINFALL) * (RV) * (DRAINAGE AREA)
(1" )*(0.742 IN/IN)*(18.84 AC)*(43,560 SF/AC)*(lFT/121N )
= 50,767 CF
* VOLUME FROM 1 -INCH PROVIDED BETWEEN ELEVATIONS 249.50 AND 252.40
PROVIDED VOLUME FROM 1" OF RUNOFF = 114,301 CF
VOLUME PROVIDED > VOLUME REQUIRED
114,301 CF > 50,767 CF
TOWN QF KNIGHTDALE VOLUME REQUIREMENT CALCULATIONS
REQUIREMENT: CONTROL AND TREAT THE DIFFERENCE IN STORMWATER RUNOFF VOLUME LEAVING
THE PROJECT SITE BETWEEN THE PRE- AND POST -DEVELOPMENT CONDITIONS FOR, AT A
MINIMUM, THE 1 -YEAR, 24-HOUR STORM. RUNOFF VOLUME DRAWDOWN TIME SHALL BE BETWEEN
24 AND 120 HOURS.
1 -YEAR, 24-HOUR PRE -DEVELOPMENT VOLUME: 74,757 CF
1 -YEAR, 24-HOUR POST -DEVELOPMENT VOLUME W/O DETENTION: 184,293 CF
REQUIRED VOLUME TO BE CONTROLLED AND TREATED: (184,293 CF - 74,757 CF) = 109,536 CF
VOLUME PROVIDED: 114,301 CF
VOLUME DRAWDOWN TIME: 108 HOURS
BASIN REQUIREMENTS
BASIN BOTTOM ELEVATION: 245.00 (244.00 PROV. FOR 1' OF SEDIMENT STORAGE)
FOREBAY BOTTOM ELEVATIONS: 245.00 (244.00 PROV. FOR 1' OF SEDIMENT STORAGE)
PERMANENT POOL ELEVATION: 249.50
TEMPORARY POOL ELEVATION: 252.40
PERMANENT POOL SURFACE AREA: 31,946 SF
IMPERVIOUS AREA DRAINING TO POND- 76 9%
WET POND( IN FEET )
1 inch = 30 ft.
PLAN VIEW TOP RISER = 254.20'
6"x12" WEIR
INV. ELEV. = 252.40
6.0" DIAMETER ORIFICE ELEV = 249.50'
1.1' FREE BOARD
100 -YEAR ELEVATION = 255.20
42" RCP pipE 10 -YEAR ELEVATION = 254.09'
W/ HEADWALL TEMPORARY POOL ELEVATION = 252.40'
- -- BERM ELEVATION 249.50' PERMANANT POOL ELEVATION = 249.50'
2 = 2 1 F 7='
6.0" I.D. PVC PIPE WITH 90' BEND 1
BOTTOM OF FOREBAY - 244.00' COMPACTED EARTH
BAFFLE
RETAINING WALL
CATCH
BASIN
"'1-6' AQUATIC SHELF
SEE PLANTING
DETAIL, THIS SHEE
INVERT = 243 50'
CONC RISER I
BOTTOM OF POND - 244.00'
PRE -CAST CONC. BASE
SEE OUTLET STRUCTURE DETAIL
30.65 LF OF 36" DIA. "0"
WET DETENTION POND SECTION RING JOINT RCP @ 1.16%
NOT TO SCALE 89.23 LF OF 36" DIA. "0"
RING JOINT RCP @ 1.16%
STORMWATER MANAGEMENT SUMMARY - ANALYSIS POINT #1
RETURN
EVENT
(YR)
PRE -DEV.
RELEASE
RATE (CFS)
POST -DEV.
RELEASE
RATE (CFS)
STORAGE
PROVIDED IN
POND (CF)
MAX. WATER
SURFACE IN POND
ELEV. (FT)
1
14.67
10.69
91,566
251.88
2
29.58
20.47
119,346
252.51
10
98.05
67.43
194,017
254.09
100
204.37
187.71
250,746
255.20
TOP OF RISER = 254.20
TOP OF BERM ELEV. = 256.30
100 YR. STORM ELEV. = 255.20
HAND WHEEL -�
10 YR. STORM ELEV. = 254.09
PERMANENT POOL VOLUME: 108,120 CF 1 - 6"x12" WEIR INV. ELEV. = 252.40---��
TEMPORARY POOL VOLUME: 114,301 CF 1 YR. STORM ELEV. = 251.88
FOREBAY VOLUME: 22,461 CF (=20.8%) 6.0" I.D. PVC PIPE WITH 90' BEND
AVERAGE BASIN LENGTH AT PERMANENT POOL: 572 FT INV. ELEV. = 249.50
AVERAGE BASIN WIDTH AT PERMANENT POOL: 97 FT PERMANENT POOL = 249.50
BASIN LENGTH TO WIDTH RATIO > 5:1 VERTICAL REINFORCING
INTERIOR BASIN SIDE SLOPES BELOW PERMANENT POOL: 2:1 #8 BARS @ 8" O.C.E.W.
INTERIOR BASIN SIDE SLOPES ABOVE PERMANENT POOL: 3:1
INTERIOR FOREBAY SLOPES: 2:1 6" DIP 6" PLUG VALVE
EXTERIOR BASIN SIDE SLOPES: 3:1 INV. ELEV. = 244.00
BERM ELEVATION: 256.30 (DEWATER)
FOREBAY BERM ELEVATION: 249.50 BOTTOM OF POND ELEV. = 244.00
YANCY CA
RISER: (2(4'x0.67') + 2(5.33x0.67')) x 11.7' = 146 CF
F0011NG: 1' X 9.33' X 9.33' = 87 CF
GROUT: 1'X4'X4'=16 CF
CONCRETE VOLUME X CONCRETE DENSITY =
= (14G CF + 87 CF + 16 CF) X 150 LBS./CF
= 37,350 LBS.
WEIGHT OF WATER DISPLACED (UPWARD FORCE)
RISER: 5.33' X 5.33' X 11.7' = 332 CF
FOOTING: 1' X 9.33' X 9.33' = 87 CF
WATER VOLUME X WATER DENSITY
= (332 CF + 87 CF) X 62.4 LBS./CF
= 26,146 LBS. < 37,350 LBS.
STRUCTURE WILL NOT FLOAT
SUPPORT BRACKET
TYP.
A
COMPACTED ' l -1 I I -I -I I
SUBGRADE HORIZONTAL REINFORCING
#4 BARS ® 8" O.C.E.W.
1
3
3
-11
66.82 LF OF 36 DIA. 0
RING JOINT RCP @ 1.16%
NOTE:
PROVIDE KEYED IN FILTER FABRIC
UNDERNEATH RIP RAP
16111114:460921
RIPRAP APRON
CLASS 2 STONE
2'-0" /8$$L,4'-0" 8" 2'-O"
D50 = 12"
US
DM AX = 18"
--''---PROVIDE STANDARD MANHOLE
APRON THICKNESS =
27"
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27'
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STEPS ON INSIDE WALL OF -
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RIP RAP SECTION VIEW
NOT TO SCALE
3
3000 PS! REINF.
"___�CONCRETE RISER
2'-0" /8$$L,4'-0" 8" 2'-O"
STRUCTURE
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LL.
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0.
36" RCP-
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III =' TOP OF FOOTING ELEVATION: 242.50
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CONCRETE FOOTING o
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CONCRETE RISER
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STRUCTURE
WET DETENTION POND OUTLET STRUCTURE SECTION
NOT TO SCALE
PLAN VIEW OF RISER STRUCTURE
NOT TO SCALE
THE CORRESPONDING COMPACTION TEST RESULTS AND CERTIFIES THE
TYPE OF FILL MATERIAL AND ITS PROPER PLACEMENT.
2. EMBANKMENT SHALL BE CONSTRUCTED OF CLEAN STRUCTURAL SOIL,
FREE OF ROOTS, VEGETATION, ROCKS AND OTHER OBJECTIONABLE
MATERIAL. SCARIFY SURFACES BEFORE PLACING FILL. PLACE FILL IN
6-8 INCH LOOSE LIFTS. COMPACT TO AT LEAST 95% OF THE STANDARD
PROCTOR DENSITY.
3. 6-12 INCHES OF CLAY SOIL (MINIMUM 15% PASSING THE #200 SIEVE
AND A MAXIMUM PERMEABILITY OF (1 X 10^-5 CM/SEC) SHALL BE
PLACED ALONG THE DAM EMBANKMENT AT AND BELOW THE NORMAL
POOL OF 248.50 TO SUSTAIN A PERMANENT POOL. APPROXIMATE
ELEVATION OF THE SEASONABLE HIGH WATER TABLE IS 238.00.
4. SLOPES ABOVE PERMANENT POOL SHALL BE SEEDED AND
STABILIZED WITH GRASS.
#4 BARS - WELDED IN
SYMMETRICAL PATTERN
(WITH HATCH FOR ACCESS)
' N
I
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l l 5'-8" I I
RISER STRUCTURE 1 I I
„
�- HEADWALL 5-4
INV: 239.00' l
I l
SEE TOWN OF KNIGHTDALE
HEADWALL STD. DETAIL
5.06 ON SHEET C.13.2
TRASH GUARD
NOT TO SCALE
3000 PSI REINF.
CONCRETE FOOTING
PROVIDE STANDARD MANHOLE
STEPS ON INSIDE WALL OF
RISER AS SHOWN
RIP RAP PLAN VIEW
NOT TO SCALE
ZCP-1 5-15
Town Certification. This design has been reviewed by the Development
Services Engineer for the Town of Knightdale, and to the best of my
knowledge and belief, it conforms to the requirements established in
the Sto and S ecifications of the Town of Knightdale.
By. - Date:
Development Servic4s Engineer
Thes lans are approved by the Town of Knightdale and serve as
con ru tion pha for "his project.
BY - - --- ate:
A minlstra or
CARO
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Scale: 1" = 30'
Drawn By: Checked By:
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Project Number:
15-0002-713
Drawing Number:
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Date: 11 /15/2016
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Project Number:
15-0002-713
Drawing Number:
CA 0so