SW6090701_Details_20090713

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WELDED TO CMP
RISER
TOP OF OUTLET BOX
TOP OF RISER
EL 160.50
EL. 160.78 25-YR 24 HOUR STORAGE ELEVATION
EL. 159.99 10-YR 24 HOUR STORAGE ELEVATION
EL. 159.29 — 5-YR 24 HOUR STORAGE ELEVATION
—
EL. 158.27 — — 1-YR 24 HOUR STORAGE ELEVATION
— — — — — — — — — — — — — — — — — — — — — — — — — — — — —
(3) 12" W x 30"L RECTANGULAR
EL. 58.07 — — W.Q. TEMP STORAGE ELEVATION
EL. 157.00 PERMANENT POND EL. 157.00
------------------
INV. = 158.07
OPENING
4" DIA.
OPENING
INV. = 157.00
OPENING
INVERT OUT 36" RCP
ELEV. = 157.00
ANTI -VORTEX PLATE
TRASH RACK
TOP OF RISER EL 160.50
— — — — —
STEPS I
RISER
TOP OF DAM
3:1 SIDE SLOPE
52.0' OF 36" CMP @ 4.4%
POND BOTTOM EL. 153.00 BOTTOM OF RISER PIPE
EXISTING CONCRETE BASE
DESIGNED AND INSTALLED BY
CONTRACTOR
WET DETENTION POND
CMP RISER OUTLET STRUCTURE DETAIL
PROJECT MANAGER
RA
DRAVING SCALE
720 CORPORATE CENTER DRIVE
RELEASED FOR
DATE
DK
SHOWN
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APPROVALS
➢ESIGN/➢RAVN BY PROJECT DATE
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BR JULY 2009
RPPROVED BY PROJECT NUMBER
DICKSON
BIDDING
DK
Office
CONSTRUCTION
FILE NAME
Carolina
Community infrastructure consultants North Cnrolina Georgia
RECORD DWG,
WATER QUALITY
South Carolina Florida
N.T.S.
WATER QUALITY/DETENTION DESIGN
AT GRAY'S CREEK MIDDLE SCHOOL
FOR
CUMBERLAND COUNTY SCHOOLS
WET POND DETAILS II
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15.0'
TOP OF DAM
ELEV. 161.0
1.25'
ELEV. 159.75
FILTER FABRIC
KENTUCKY BLUEGRASS AND MAT LINER
EMERGENCY SPILLWAY
N.T.S.
r— 12" THK. CONC.
COLLAR
36" DIA. PIPE
12" MIN. BEYOND PIPE
ANTI -SEEP COLLAR
DAM AND EMBANKMENT CONSTRUCTION
I. GENERAL - THE POND AND DAM AREA SHALL BE CLEARED, GRUBBED AND STRIPPED OF ALL
VEGETATIVE MATERIAL AND TOP SOIL PRIOR TO DAM CONSTRUCTION. THE DISPOSAL OF TREES,
STUMPS, CONSTRUCTION DEBRIS, VEGETATIVE MATERIAL, ETC. SHALL NOT BE PERMITTED IN THE
DAM OR POOL AREA OF THE POND. WHEN BLASTING IS USED TO REMOVE ROCK FROM THE
POOL AREA, THE BLASTED AREA SHALL BE OVER -EXCAVATED TO A DEPTH OF AT LEAST TWO
FEET (2) BELOW FINISHED GRADE AND BROUGHT BACK TO FINISHED GRADE WITH CLEAN
RELATIVELY IMPERVIOUS SOIL MATERIAL COMPACTED IN PLACE.
2. EARTH FILL DAMS
A) SOIL MATERIALS USED FOR EARTH FILL WHICH ARE HIGHLY PERMEABLE OR WHICH EXHIBIT
SIGNIFICANT SHRINKAGE SWELL, OR DISPERSION SHALL NOT BE USED IN THE EMBANKMENT.
B) A CUTOFF TRENCH (CORE TRENCH) SHALL BE PROVIDED WITH A MINIMUM WIDTH OF FIVE
FEET (5'). THE CENTERLINE OF THE CUTOFF TRENCH SHALL NOT BE LOCATED DOWNSTREAM
OF THE INSIDE TOP OF SLOPE OF THE DAM. THE CUTOFF TRENCH SHALL BE CAREFULLY
BACK -FILLED WITH HIGHLY IMPERMEABLE MATERIAL AND COMPACTED TO AT LEAST
NINETY-FIVE PERCENT (95%) OF STANDARD PROCTOR DENSITY.
C) THE MINIMUM TOP WIDTH OF THE DAM SHALL BE TEN FEET (10-) AND SLOPES SHALL NOT BE
STEEPER THAN 3:1 (THREE HORIZONTAL TO ONE VERTICAL) ON THE DAM OR EMBANKMENTS
AROUND THE POND.
D) ALL DISTURBED GROUND AREAS AND EMBANKMENTS SURROUNDING THE POND SHALL BE
MECHANICALLY STABILIZED OR HAVE PERMANENT SEEDING SCHEDULE
OPERATION AND MAINTENANCE
INSPECTION EVERY MONTH TO INCLUDE THE FOLLOWING:
I. REMOVE DEBRIS FROM THE OUTLET STRUCTURE.
2. CHECK AND CLEAR THE ORIFICE OF ANY OBSTRUCTIONS.
3. CHECK THE POND SIDE SLOPES; REMOVE TRASH, REPAIR ERODED AREA BEFORE THE NEXT
RAINFALL EVENT.
INSPECTION EVERY 3 MONTHS TO INCLUDE THE FOLLOWING:
I. INSPECT THE COLLECTION SYSTEM (I.E. CATCH BASINS, PIPING, GRASSED SWALES) FOR
PROPER FUNCTIONING. CLEAR ACCUMULATED TRASH FROM BASIN GRATES AND BASIN
BOTTOMS, AND CHECK PIPING FOR OBSTRUCTIONS.
2. CHECK POND INLET PIPES FOR UNDERCUTTING, REPLACE RIPRAP, AND REPAIR BROKEN PIPES.
3. RESEED GRASS SWALES TWICE A YEAR AS NECESSARY. REPAIR ERODED AREAS IMMEDIATELY.
INSPECTION EVERY 6 MONTHS TO INCLUDE THE FOLLOWING:
I. REMOVE ACCUMULATED SEDIMENT FROM THE BOTTOM OF THE OUTLET STRUCTURE.
2. CHECK POND DEPTH AT VARIOUS POINTS IN THE POND. IF DEPTH IS REDUCED TO 75% OF
ORIGINAL PERMANENT SEDIMENT STORAGE DESIGN DEPTH, SEDIMENT WILL BE REMOVED TO
AT LEAST ORIGINAL DESIGN DEPTH.
3. OWNER IS RESPONSIBLE FOR PROVIDING A PUMP TO DRAIN THE POND FOREBAY FOR ROUTINE
MAINTENANCE AND CLEAN OUTS, IF NEEDED.
4. OPERATE DRAIN VALVE FROM FULLY OPEN TO FULLY CLOSED POSITION.
MAINTENANCE AS REQUIRED:
I. MOW THE SIDE SLOPES ACCORDING TO THE SEASON. MAXIMUM GRASS HEIGHT WILL BE 6".
2. CATTAILS AND OTHER INDIGENOUS WETLAND PLANTS ARE ENCOURAGED ALONG THE POND
PERIMETER; HOWEVER, THEY MUST BE REMOVED WHEN THEY COVER THE ENTIRE
SURFACE AREA OF THE POND.
3. THE ORIFICE IS DESIGNED TO DRAW DOWN THE POND IN 2-5 DAYS. IF DRAWDOWN IS NOT
ACCOMPLISHED IN THAT TIME, THE SYSTEM MAY BE CLOGGED. THE SOURCE OF THE CLOGGING
MUST BE FOUND AND ELIMINATED.
4. ALL COMPONENTS OF THE DETENTION POND SYSTEM MUST BE KEPT IN GOOD WORKING ORDER
LINE FACE OF DAM
w/ I.0' OF # S7
WASHED STONE
FILTER FABRIC UNDER DAM
(MIRAFI 500 OR APPROVED EQUAL)
KEY DAM INTO EXISTING GRADE
NORMALPOOL
3:1 SIDE SLOPE
0.50' ABOVE NORh
NORMALPOOI
SECTION
N.T.S.
ELEVATION
PnRFRAY RAFFI F
3:1 SIDE SLOPE
6'
FOREBAY ELEV.=154.00�0
FOREBAY BAFFLE
SEE DETAIL
POND CROSS-SECTION
N.T.S.
PRO,ECT MANAGER
DK
DRAWING SCALE
AS SHOWN
W K ` - /�'
®
DDICKSON Office Locations:
community infrastructure consultants North Carolina Georgia
South Carolina Florida
RELEASED FOR
DATE
APPROVALS
DESION/DRAWN BY
BR
PROJECT DATE
JULY 2009
BIDDING
APPROVED BY PROJECT -NUMBER
DK
FlLE NAME
WATER QUALITY
CONSTRUCTION
RECORD DWG.
3:1 SIDE SLOPE
25-YR ELEV. 160.78
1-YR ELEV. 158.27
NORMAL POOL ELEV. 157.00
BOTTOM STORAGE ELEV. = 154
I' OF SEDIMENT STORAGE
BOTTOM ELEV. = 153
30 0 30 60
SCALE: 1" 30'
WET DETENTION POND
SURFACE AREA
SURFACE AREA
FOREBAY
FOREBAY
PERM. POOL
POND DEPTH
I" STORAGE
REQUIRED
I
PROVIDED
VOLUME REQ.
VOLUME PROVIDED
ELEVATION
(FT)
ELEVATION
(SF)
(SF)
(CF)
(CF)
157.00
4.0' T
158.07
1 29.309
38,437
26,906
33,999
10:1 VEGETATIVE SHELF
3:1 SIDE SLOPE
TOP OF DAM
ELEV. 161.00
3:1 SIDE SLOPE
WATER QUALITY/DETENTION DESIGN
AT GRAY'S CREEK MIDDLE SCHOOL
FOR
CUMBERLAND COUNTY SCHOOLS
WET POND DETAILS
R
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