SW1220701_Plansheet - SCM Detail_20220805 (2)

BIORETENTION CELL MAINTENANCE:
• WATERING: PLANTS SHOULD BE SELECTED TO BE TOLERANT OF THE BIORETENTION FACILITY'S PARTICULAR
CONDITIONS. WATERING MAY BE REQUIRED TO INITIALLY ESTABLISH THE VEGETATION. WATERING SHOULD NOT BE
REQUIRED AFTER ESTABLISHMENT (ABOUT 2 TO 3 YEARS). HOWEVER, WATERING MAY BE REQUIRED DURING
PROLONGED DRY PERIODS AFTER PLANTS ARE ESTABLISHED.
• EROSION CONTROL: INSPECT FLOW ENTRANCES, PONDING AREA, AND SURFACE OVERFLOW AREAS PERIODICALLY.
REPLACE SOIL, PLANT MATERIAL, AND/OR MULCH IN AREAS WHERE EROSION HAS OCCURRED. EROSION PROBLEMS
SHOULD NOT OCCUR WITH PROPER DESIGN EXCEPT DURING EXTREME WEATHER EVENTS. IF EROSION PROBLEMS DO
OCCUR, THE FOLLWING ISSUES SHOULD BE REASSESSED:
FLOW VOLUMES FROM THE CONTRIBUTING DRAINAGE AREA AND BIORETENTION SIZE;
FLOW VELOCITIES AND GRADIENTS WITHIN THE BIORETENTION FACILITY
FLOW DISSIPATION AND EROSION PROTECTION METHODS IN THE PRETREATMENT AND IN -FLOW AREAS
IF SEDIMENT IS DEPOSITED IN THE BIORETENTION FACILITY, IMMEDIATELY DETERMINE THE SOURCE, REMOVE EXCESS
DEPOSITS, AND CORRECT THE PROBLEM.
• PLANT MATERIAL: DEPENDING ON PLANTS SELECTED AND AESTHETIC REQUIREMENTS, OCCASIONAL PRUNING AND
REMOVAL OF DEAD PLANT MATERIAL MAY BE NECESSARY. BE CAREFUL TO PRUNE TREES AND SHRUBS TO
MAINTAIN LINES OF SIGHT IN PARKING LOTS AND ALONG ROADWAYS. NCDOT STATES: "SHRUBS MUST BE KEPT
LOW, AND TREES AND LARGE SHRUBS UNDER -TRIMMED SUFFICIENTLY TO PERMIT CLEAR SIGHT IN THE AREA
BETWEEN 2 FEET AND 6 FEET ABOVE ROADWAY ELEVATIONS. REPLACE ALL DEAD PLANTS. HOWEVER, IF SPECIFIC
PLANTS CONSISTENTLY HAVE A HIGH MORTALITY RATE, ASSESS THE CAUSE AND REPLACE WITH APPROPRIATE
SPECIES. PERIODIC WEEDING IS NECESSARY UNTIL GROUNDCOVER PLANTS ARE ESTABLISHED. WEEDING SHOULD
BECOME LESS FREQUENT IF AN APPROPRIATE PLANT DENSITY HAS BEEN ESTABLISHED.
• NUTRIENTS AND PESTICIDES: THE SOIL MEDIA AND PLANT MATERIAL SHOULD HAVE BEEN SELECTED FOR OPTIMUM
FERTILITY, PLANT ESTABLISHMENT AND GROWTH WITHIN THE PARTICULAR CONDITIONS OF EACH BIORETENTION
FACILITY. NUTRIENT AND PESTICIDE INPUTS SHOULD NOT BE REQUIRED AND WILL DEGRADE THE POLLUTANT
PROCESSING CAPABILITY OF THE BIORETENTION FACILITY, AS WELL AS CONTRIBUTE TO ADDITIONAL POLLUTANT
LOADING TO RECEIVING WATERS. BY DESIGN, BIORETENTION FACILITIES ARE TYPICALLY SPECIFIED IN WATERSHEDS
WHERE PHOSPHOROUS AND NITROGEN LEVELS ARE OFTEN ELEVATED. THEREFORE, THESE SHOULD NOT BE LIMITING
NUTRIENTS WITH REGARD TO PLANT HEALTH. IF IN QUESTION, HAVE THE SOIL ANALYZED FOR FERTILITY. ADDITION
OF COMMERCIAL FERTILIZER OR COMPOST TO BIORETENTION WILL LIKELY RESULT IN NUTRIENT EXPORT FROM THE
BED.
• MULCH: REPLACE MULCH ANNUALLY IN BIORETENTION FACILITIES WHERE HEAVY METAL DEPOSITION IS LIKELY (E.G.
DRAINAGE AREAS THAT INCLUDE COMMERCIAL/INDUSTRIAL USES, PARKING LOTS, OR ROADS). METAL 'HOT SPOTS'
OCCUR WHERE WATER ENTERS THE BED. IN RESIDENTIAL OR OTHER SETTINGS WHERE METAL DEPOSITION IS NOT A
CONCERN, REPLACE OR ADD MULCH AS NEEDED TO MAINTAIN A 2 TO 4-INCH DEPTH.
• FILTERING CAPACITY: WHEN THE FILTERING CAPACITY DIMINISHES SUBSTANTIALLY (E.G., WHEN WATER PONDS ON TE
SURFACE FOR MORE THAN 12 HOURS), THE TOP FEW INCHES OF MATERIAL SHOULD BE REMOVED AND REPLACED
WITH FRESH MATERIAL. THE REMOVED SEDIMENTS SHOULD BE DISPOSED OF IN AN ACCEPTABLE MANNER (E.G.,
LANDFILL) OR LAND APPLICATION. IF THAT DOES NOT SOLVE THE PROBLEM, MORE EXTENSIVE REBUILDING IS
REQUIRED. IF THE BED HAS FILTER FABRIC INSTALLED UNDER THE MEDIA AND ABOVE THE WASHED ROCK, THE
FILTER FABRIC MAY BE CLOGGED WITH SEDIMENT. IF CLOGGED FILTER FABRIC IS PRESENT, THE BED WILL NEED TO
BE REBUILT.
100 ato]Lk•]go] 60601t•Ie
2'-6"
TRENCH WIDTH
4 (MIN.)
BIORETENTION CELLS NOTES:
AN UNDERDRAIN WITH INTERNAL WATER STORAGE (IWS) SHALL BE INSTALLED UNLESS IT IS DEMONSTRATED THAT THE IN -SITU
SOIL INFILTRATION RATE IS TWO INCHES PER HOUR OR GREATER IMMEDIATELY PRIOR TO THE INITIAL PLACEMENT OF THE
MEDIA. THE TOP OF THE INTERNAL WATER STORAGE ZONE SHALL BE SET AT A MINIMUM OF 18 INCHES BELOW THE PLANTING
SURFACE.
FOR BIORETENTION CELLS WITH VEGETATION OTHER THAN SOD, THE PLANTING PLAN SHALL BE DESIGNED TO ACHIEVE A
MINIMUM OF 75 PERCENT PLANT COVERAGE AT FIVE YEARS AFTER PLANTING. THE MAXIMUM COVERAGE WITH TREE OR SHRUB
CANOPY SHALL BE 50 PERCENT AT FIVE YEARS AFTER PLANTING. IF SOD IS USED, THEN IT SHALL BE A NON-CLUMPIN,
DEEP-ROOTED SPECIES.
FOR BIORETENTION CELLS WITH VEGETATION OTHER THAN SOD, TRIPLE SHREDDED HARDWOOD MULCH SHALL BE USED FOR THE
PORTION OF THE CELL THAT WILL BE INUNDATED. MULCH SHALL BE UNIFORMLY PLACED TWO TO FOUR INCHES DEEP.
A MINIMUM OF ONE CLEAN -OUT PIPE SHALL BE PROVIDED ON EACH UNDERDRAIN LINE. CLEAN OUT PIPES SHALL BE CAPPED.
FLOW SHOULD ENTER THE BIORETENTION CELL VIA DISPERSE FLOW OR AN ENERGY DISSIPATER.
PRETREATMENT SHOULD BE PROVIDED
�4" OF TOPSOIL
ROVIDE GEOTEXTILE
4BRIC AROUND STONE
NOTE: PERFORATED PIPE SHALL CONFORM TO NCDOT SPECIFICATIONS
UNDER DRAIN DETAIL
9/16"0
NOT TO SCALE
MADE IN THE U.S.A.
AVAILABLE MATERIALS:
MILD STEEL (NO FINISH) -WGT: 269.9 lbs.
MILD STEEL (GALVANIZED) -WGT: 269.9 lbs.
STAINLESS STEEL - WGT: 269.9 Ibs.
ALUMINUM - WGT: 91.1 lbs.
CUSTOM SIZES AVAILABLE
AVAILABLE UPON REQUEST WITH:
ACCESS PORT
ANTI -VORTEX PLATE
'TRASH RACKS Ecom
LDR-48
101 IRONWOOD ROAD 48" ROUND TOP -MOUNT TRASH RACK
MIDDLESBORO, KY 40965
PH:[phone] DWG. NO. O
FAX [phone] /� REV.
JRHOE.COM A 118493 SHEET 1 / 1
OUTLET PROTECTION
TYPICAL (SCOURSTOP)
PIPE W/ FLARED -END
SECTION
6" GRAVEL JACKET -
NON -PERFORATED PVC
UNDERDRAIN SYSTEM
CLEAN -OUTS - TYP.
SEE PLANS FOR LOCATION
OVERFLOW STORM INLET
(MAX POND DEPTH =
® SEE PLANS)
—OUTLET PROTECTION
TYPICAL (SCOURSTOP)
O
PLANTING MIX
00
TOP OF FABRIC
ELEVATION = 1000.0
PERMEABLE FILTER FABRIC
(WRAPPED AROUND 6" WASHED STONE)
4 INCH PERFORATED DRAIN
(SEE PLANS FOR LAYOUT)
MEDIA NOTES:
MEDIA MIX
THE MEDIA SHOULD BE COMPOSED OF A HOMOGENOUS MIX OF THE FOLLOWING:
• 75-85% MEDIUM TO COARSE WASHED SAND
• 8-15% FINES (SILT AND CLAY)
• 5-15% ORGANIC MATTER (SUCH AS PINE BARK FINES)
MINIMUM MEDIA DEPTH
ALL CELLS WITH TREES AND SHRUBS: 36 INCHES
CELLS WITHOUT TREES AND SHRUBS:
WITH NO IWS: 24 INCHES
WITH IWS: 30 INCHES
MEDIA P-INDEX
LESS THAN 30 INCHES NSW WATERS
LESS THAN 50 ELSEWHERE
MEDIA MAINTENANCE
MAINTAIN MEDIA SUCH THAT INFILTRATION RATE IS AT LEAST 1 IN/HR
ELEV: 1007.00
PROPOSED STORM WATER
MANAGEMENT SIZE REQUIREMENTS
ELEVATION
AREA (S.F.)
AREA (AC)
1003.00
3.612
0.08
1004.00
3,890
0.09
POND VOL
3,751 CF
0.09 AC -FT
TRASH RACK
RIM: 1004.00
INV: 999.00
POND SLOPES - TYP.
JUNCTION BOX
FLARED -END
RIM: 1006.25
SECTION WITH
OUTLET
PROTECTION
TOP OF DIKE ELEV: 1007.0
To-
2
INV: 1004.00
11 — —
1 18"
MAX POND
2 —II _ l '
INLET
ELEVATION:
1 I
PIPES
o 1004.00
=III_
- - -------
TOP OF MEDIA ELEV: 1003.00
MEDIA MIX TOP OF IWS ZONE ELEV: 1001.50
PROVIDE 1
BOTTOM OF MEDIA ELEV: 1000.00
CLEANOUT PER
UNDERDRAIN _I
4"v
12" SDR 35 PVC
_I
—I
_11
I —III I
1.00% SLOPE
I —I -
PERFORATED 4" SDR 35 PVC
INV: 999.0
NO MECHANICAL COMPACTION
DO NOT MECHANICALLY
4" PERFORATED PIPE- TYP.
COMPACT THE MEDIA, WATER
(SEE PLANS FOR LAYOUT)
OR WALK ON IT AS IT IS
PLACED
BIO RETENTION POND (FINAL CONDITION)
BIO RETENTION POND OUTLET STRUCTURE DETAIL
why use the
SCOURSTOP SYSTEM?
ScourStop transition mats protect against erosion and scour at culvert
outlets with a vegetated solution in areas traditionally protected with
rock or other hard armor.
ScourStop is part of a system that includes semi -rigid transition mats
installed over sod or turf reinforcement mats. Each Tx Tx '/:" mat is
made of high -density polyethylene and secured tightly to the ground
with anchors.
Circular Culvert Outlet Protection
PIPE
DIAMETER
VELOCITY <_ 10 FT/SEC
10 < VELOCITY < 16 FT/SEC
TRANSITION
MATWxL
QUANTITY
OF MATS
TRANSITION
MAT WxL
QUANTITY
OF MATS
12"
4' x 4'
1
4' x 8'
2
24"
8' x 8'
4
8' x 12'
6
36"
8' x 12'
6
1 12' x 20'
15
48"
12' x 16'
12
12' x 24'
18
60"
12' x 20'
15
16' x 32'
32
72"
16' x 24'
24
20' x 36'
45
These are minimum recommendations. More ScourStop protection may be needed depending
upon site and soil conditions, per project engineer.
If velocity is greater than 16 fps, contact manufacturer for design assistance.
ScourStop mats have been shown to at least double the effectiveness of turf
reinforcement mats.
ScourStop fully vegetated channel (2:1 slope): velocity = 31 fps,
shear stress = 16 psf.
NOT TO SCALE
1. ScourStop mats must be installed over a soil cover: sod, seeded turf reinforcement mat (TIl geotextile, or a combination thereof.
2. For steep slopes (> 10%) or higher velocities (> 10 fit/sec), sod is the recommended soil cover.
3. Follow manufacturer's ScourStop Installation Guidelines to ensure proper installation.
4. Install ScourStop mats at maximum 1-2' below Flowline of culvert or culvert apron. (No waterfall impacts onto ScourStop mats.)
5. Performance of protected area assumes stable downstream conditions.
LENGTH OF PROTECTION
TRANl MAT APRON LENGTH WIDTH OF PROTECTION*
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CULVERT OUTLET PROTECTION - PLAN VIEW
MAX. 1 "-2" DROP
FROM CULVERT FIL I
CULVERT FLOWLINE ONTO SCOURSTOP MATS
PROFILE VIEW
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ANCHOR PATTERN
Abut transition mats to end of culvert or culvert apron.
Adjacent mats abut together laterally and longitudinally
Minimum 8 anchors per mat.
Extm anchors as needed for loose or wet soils.
Extra anchors as needed for uneven soil surface.
-�
Transition mat apron protects
culvert outlet.
`Width of protection:
Bottom width of channel and up
both side slopes to a depth at
least half the culvert diameter.
r Protect bare/disturbed downstream
soils from erosion with appropriate
soil cover.
Use normal -depth calculator to
compute for downstream protection.
C REESSED
�LOCK - WASHER
T SITION MAT
sr ANCHoa srRAa
131-ANCHOR
ANCHOR ILLUSTRATION
Install anchors per SCourStop Installation Guidelines.
Minimum depth 24" in compacted, cohesive soil.
Minimum depth 30" in loose, sandy, or wet soil.
Extra anchors as needed to secure mat tightly over soil cover.
HANESGEOCOMPONENTS" ALEADERintheGEOSYNTHETICand EROSION COtITROLindustries
A `.. 1,w..W coMVANr Learn more about our products at: HanesGeo.com 1888.239.4539
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OUTLET PROTECTION
INV = 998.00
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IN 6-INCH MIN. WASHED STONE
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121 MANLY STREET
GREENVILLE, SC 29601
864-242-2514
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Date
APRIL 2022
Revisions
A ISSUE FOR PERMIT REVIEW 05.25.22
B REVISED PLANS 07.20.22
Project Number
2273.001
OUTLET STRUCTURE TRASH RACK
NOT TO SCALE
SCOURSTOP
NOT TO SCALE
Sheet
C600