SW4231202_Plansheet - SCM Detail_20240311 (4)

PERMANENT SEDIMENT STORAGE IN MAIN POOL-STAGE-STORAGE TABLE 6' VEGETATED SHELF PLANTING SPECIFICATIONS: Planting and After-Care Requirements:
ALLOCATION CHART FOR WET DETENTION POND #2 MINIMUM REQUIRED PLANTINGS: 50 PLANTS/200 SF SHELF AREA (per NCDENR STORMWATER BMP MANUAL)EL Soil amendments should be incorporated at the end of the site development process to prevent sediment from "In accordance with the requirements in articles GS 143-215.25A and 143-215.26 of the
ELEVATION AREA (SF) VOLUME (CF) CUM. VOLUME (CF) 6' VEGETATED SHELF AREA: = 1,440 SF (SHF AREA AROUND FOREBAY EXCLUDED FROM AREA CALCULATIONS)
ON-SITE DRAINAGE AREA TO POND #2 6.27 ACRES MINIMUM REQUIRED PLANTINGS: 50 PLANTS EL SF 1, SF = 360 PLANTS (4" container) entering the BMP focaility. The BMP should be planted and mulched immediately after amending the soil to NC Dam Safety Law and NC Administrative Code 15A NCAC 2K .0200, the Regional
722 1.687 0 0 stabilize the site as soon as possible.
OFF-SITE DRAINAGE AREA TO POND #2 0.06 ACRES Engineer in the Winston-Salem Regional Office of the NC State,s Land Quality Section
SHALLOW WATER PLANTS Newly installed plant material requires water in order to recover from the shock of beingtransplanted. Be sure TOTAL DRAINAGE AREA = 6.33 ACRES
722.50 2,015 926 926 y q p has been / will be contacted for the determination of whether the proposed dam is TOTAL DRAINAGE AREA TO POND 2 6.33 ACRES Iris Virginico (common name: Blue Flag Iris): 60 plants (4" Container) that some source of water is especially g y p p p p P PROPOSED BUA TO POND = 3.25 ACRES (51.34%)
provided, es eciall Burin dry periods. This will reduce plant loss and provide the
Sagittoria Lancifolia (common name: Bulltounge): 60 plants (4" container) new materials with a chance to establish root growth.MAIN POOL STAGE-STORAGE TABLE Pontederia Cordata (common name: Pickerelweed): 60 plants (4" container) governed by or exempt from the Dam Safety Law.�i PERMANENT SEDIMENT STORAGE:
ON-SITE BUA TO POND #2 3.19 ACRES In general, fall and winter are optimal for planting in North Carolina. There are some exceptions. Shallow water PERMANENT STORAGE REQUIRED: MIN. 6" IN PERMANENT POOL AND FOREBAY
ELEVATION AREA (SF) VOLUME (CF) CUM. VOLUME (CF) SHALLOW LAND PLANTS plants should be installed between April 1 and July 15. STORAGE PROVIDED IN FOREBAY: 722 TO 723.50 => 460 CF
OFF-SITE BUA TO POND #2 (100% OFFSITE AREA) 0.06 ACRES Asclepias incarnate (common name: Swamp Milkweed): 60 plants (4" container) STORAGE PROVIDED IN MAIN POOL: 722 TO 722.50 => 926 CF
722.50 2,015 0 0 TOTAL BUA TO POND #2 3.25 ACRES Lobelia Cardinalis (common name: Cardinal Flower): 60 plants (4" container) Minimize or eliminate the use of pesticides and fertilizers. A one-time application of fertilizer is allowable to
Hibiscus coccineus (common name: Scarlet Rose Mallow): 60 plants (4" container) help establishment. TOTAL FOREBAY VOLUME: 2,640 CF
723 2,358 1,093 1,093 PLANTS & MIXTURES PLANTING RATES/ACRE PLANTING DATES MAIN POOL VOLUME @ ELEVATION 727: 16,803 CF
Note: Any shallow water and shallow land herbaceous plant from the NCDEQ Starmwater BMP Manual A minimum two year warranty is required. At the end of the first year, and again at the end of the second
MAXIMUM BUA TO WET DETENTION POND #2 3.25 ACRES (51.34%) may be substituted for the above mentioned plant species on the vegetated shelf. A minimum of year, all plants that do not survive must be replaced. TALL FESCUE 100-150 LBS AUG. 15-OCT. 15 % FOREBAY VOLUME TO PERMANENT POOL VOLUME: 2,640 CF / 16,803 CF = 15.71%
724 3,092 2,725 3,818 y P P 9 NOTE:
three (3) different species of plants is to be used. The herbaceous plant species specified above (LOW MAINTENANCE) FEB. 15-MAY 1
725 3,890 3,491 7,309 are common locally and readily available for purchase. All plant species used (if they differ from If best professional practices show that mowing is needed to maintain optimal plant health, mow according to THE PERMANENT WET DETENTION POND SHOWN ON THIS PLAN PERMANENT WATER QUALITY POOL:
best professional practices. MUST BE STABILIZED WITHIN 14 DAYS OF THE COMPLETION OF TALL FESCUE 200-250 Las AUG. 15-OCT. 15
726 4,750 4,320 11,629 ENGINEER STATEMENT OF POND AND DAM SAFETY
those shown above) are to be reported to Engineer for approval prior to planting. (HIGH MAINTENANCE) FEB. 15-MAY 1 AVERAGE DEPTH CALCULATION (EQUATION 3 PER NCBMP MANUAL)
If plants are dead, diseased, or dying, determine the source of the problem, remedy it, and replace affected CONSTRUCTION. AREAS AND VOLUME TAKEN FROM BOTTOM OF SHELF TO TOP OF
Total Number of Plants Specified: 360 plants plants. TALL FESCUE& 100 LBS& FEB. 15-MAY 1 THE SEDIMENT STORAGE ELEVATION AND EXCLUDES FOREBAY VOLUME & AREA:
726.50 5,083 2,458 14,087 THE STORMWATER POND AND DAM SHOWN ON THIS PLAN SATISFIES KOBE OR KOREAN LESPEDEZA 20-25 LBS(SCARIFIED SEED FOR SPRING AUG. 15-OCT. 15 PERIMETER OF PERMANENT POOL: 240'
REQUIREMENTS OF THE NORTH CAROLINA STATE DAM SAFETY LAW OF 1967 Soil Specifications: If weeds are present, remove weeds, preferably by hand. If a pesticide is used, wipe it on the plant rather than &UNSCARIFIED FOR LATE FALL&WINTER)
727 5.781 2,716 16,803 AS AMENDED THROUGH 1995 AND THE RULES AND REGULATIONS ASspraying. MAX WATER DEPTH OVER SHELF: 0.50'
WIDTH OF SUBMERGED PORTION OF SHELF: 3.0'
PRESENTED IN THE NORTH CAROLINA ADMINISTRATIVE CODE TITLE 1 5A, The soil mix must be uniform and free of stones, stumps, roots, or other similar material greater than twoTALL FESCUE& 50 Las& NOV. 1-FEB. 1
STAGE-STORAGE TABLE inches. WET DETENTION POND CONSTRUCTION SEQUENCE: SERICEA LESPEDEZA 60 LBS/ACRE (UNSCARIFIED) VOLUME OF SHELF(Vshelf): 0.50 x 0.50' x 240' x 3.0' = 180 CF
SUBCHAPTER 2K - DAM SAFETY. EVEN IN THE CASE WHERE THE DAM 1. EXCAVATE POND TO BOTTOM ELEVATION OF POND.
FOR ENTIRE POND STORAGE ABOVE THE PERMANENT POOL ELEVATION SHOWN ON THIS PLAN IS DETERMINED BY THE STATE TO BE EXEMPT FROM Soil texture of the mix should be loamy sand with no more than 10% clay (USDA soil texture classification) TALL FESCUE& 60 LBS& JULY&AUGUST MAIN POOL VOLUME (EXCLUDING 12" SEDIMENT STORAGE): 16,803 CF
THE ABOVE NOTED DAM SAFETY REQUIREMENTS, I, AS THE QUALIFIED 2. GRADE DAM EMBANKMENT, 20' EMERGENCY SPILLWAY, AND VEGETATED SHELF. GERMAN MILLET 30 Les AREA AT BOTTOM OF SHELF: 5,083 SF
ELEVATION AREA (SF) VOLUME (CF) CUM. VOLUME (CF) DESIGN ENGINEER, STATE THAT THE POND AND DAM ARE DESIGNED TO BE A minimum organic content of 10% by dry weight for areas planted with woody species and 5% for turf areas. NOTE: 3. INSTALL RISER, BARREL, TRASH RACK, AND RIP-RAP PAD AS SHOWN ON PLANS. OR SUDANGRASS (MILLET&SUDANGRASS MUST BE KEPT AT 10-12") AVERAGE DEPTH = (16,803 CF - 180 CF) / 5,083 SF = 3.27'
SAFE AND ADEQUATE FOR THE PROTECTION OF PUBLIC HEALTH, SAFETY, The PH should be between 5.5 and 7.0. If the PH falls outside of this range, it my be modified with lime to STORMWATER RUNOFF FROM THE ENTIRE WET DETENTION 4. REMOVE ALL ACCUMULATED SEDIMENT FROM THE POND AND FINAL GRADE THE TALL FESCUE& 70 Las& NOV. 1-JAN. 30
727 7,839 0 0 WELFARE, AND DOWNSTREAM PROPERTY. I UNDERSTAND THAT THIS STATE- POND. ENSURE THE INSIDE BOTTOM AND SIDE SLOPES OF THE POND ARE 3.27' WATER QUALITY POOL AVE. DEPTH, 52% B.U.A.
increase the PH or iron sulfate and sulfer to lower the PH. The lime or iron sulfate must be mixed uniformly POND'S DRAINAGE BASIN WILL BE CONVEYED TO THE WET RYEGRAIN 25 LBS(RYGRAIN MUST BE KEPI AT 10-12")
MENT AS THE DESIGN ENGINEER SHALL NOT RELIEVE THE OWNER OR into the soil prior to use. COMPACTED APPROPRIATELY OR LINED SO THAT THE INFILTRATION RATE OF WATER REQUIRES 1.77224% SURFACE AREA
727.50 8,841 4,170 4,170 OPERATOR OF THE POND AND DAM FROM THE LEGAL DUTIES, OBLIGATIONS, DETENTION POND VIA A NETWORK OF STORM SEWER PIPES
1.77224%
8 Las HULLED APRIL 15-JUNE 30 REQUIRED = x 6.33 AC x 43 560 SF AC = 4.887 SF
AND LIABILITIES ARISING FROM SUCH OWNERSHIP OR OPERATION. Planting soil can be amended on-site soil material or soil brought in from off-site. In either case, it must OUT OF THE POND IS LESS THAN 0.01 IN/HR. COMMON BERMUDAGRASS ( ) Q 100 /
728 9,363 4,551 8,721 9 9 THAT WILL BE DESIGNED AND INSTALLED PER NCDOT 5. ALL ACCUMULATED SEDIMENT MUST BE REMOVED FROM POND AND THE POND IS TO 5-20 LBS(UNHULLED) FEB. 1-MARCH 30 TOP ELEVATION (AVE. DEPTH = 3.27')= 727.00
meet the requirements specified and a soil analysis furnished stating that the soil meets all the requirements
before any planting can begin. STANDARDS AND SPECIFICATIONS. THE STORM PIPE BE RESTORED TO ORIGINAL DESIGN VOLUME PRIOR TO CONVERTING THE POND SEEDBED PREPARATION PROVIDED = 5,781 SF (AREA EXCLUDES FOREBAY)
729 10,450 9,907 18,628 PERMANENT WET DETENTION POND NOTES: FROM AN EROSION CONTROL DEVICE TO A WET DETENTION POND. 1. STRIP THE AREA TO BE SEEDED TO A MINIMUM DEPTH of 4-6 INCHES.
The following criteria apply to vegetation in and around the Wet detention pond: NETWORK WILL ENTER THE POND AT AN ELEVATION EQUAL 2.REMOVE ALL LOOSE ROCK, ROOTS, ETC. LEAVING SURFACE SMOOTH AND UNIFORM.
730 11,594 11,022 29,650 (a) The dam structure, including front and back embankment slopes, of the pond shall be vegetated with 6. SEED AND STABILIZE POND ABOVE THE PERMANENT POOL AND DAM EMBANKMENT
1. THE ENGINEER'S CERTIFICATION OF COMPLETION WILL BE REQUIRED PRIOR TO THE TO THE PERMANENT POOL ELEVATION. 3.APPLY SEED, AGRICULTURAL LIME, ELOW'ZER,AND SUPERPHOSPHATE UNIFORMLY AND TEMPORARY WATER QUALITY STORAGE VOLUME:
731 12,794 12,194 41,844 FINAL PLAT OR CERTIFICATE OF OCCUPANCY. THE STORMWATER CONTROL IS TO BE non-clumping turf grass; trees and woody shrubs shall not be allowed; and SLOPES. Mlx WITH THE SOIL(RATES ARE BELOW).
(b) The vegetated shelf shall be planted with a minimum of three diverse species of herbaceous, native 7. INSTALL 6' VEGETATED SHELF PLANTINGS AS SPECIFIED ON THE PLAN. 4.SEED ON A FRESHLY PREPARED SEEDBED AND COVER THE SEED LIGHTLY NTH SEEDING WATER QUALITY VOLUME REQUIRED: 1" RUNOFF FROM POND'S ENTIRE DRAINAGE BASIN
INSPECTED TO ENSURE IT IS FUNCTIONING AS DESIGNED AND HAS FULL DESIGN VOLUME vegetation at a minimum density of 50 plants per 200 square feet of shelf area. FOf1ERAY EQUIPMENT OR CULTIPACK AFTER SEEDING. FOR 52% B.U.A.
732 14,051 13,423 55,266 PRIOR TO ISSUANCE OF THE FINAL CERTIFICATE OF OCCUPANCY. 5.MULCH IMMEDIATELY AFTER SEEDING AND ANCHOR MULLCH.
2,640 CF Rv= 0.05+ (0.009)(52)
733 15,365 14,708 69,974 2. THE TOWN OF BERMUDA RUN AND THEIR ASSIGNS HAVE RIGHT TO ACCESS THE (SEEDETAIL) -RATES: AGRICULTURAL LIMESTONE- 2 TONS/ACRE Rv= 0.518
STORMWATER CONTROL(S) FOR INSPECTION OR MAINTENANCE, AS NECESSARY. FERTILIZER- 10-10-10 AT 800-1000 POUNDS/ACRE VOLUME REQ'D.= 1.0 * Rv * DA
FOREBAY STAGE-STORAGE TABLE SUPERPHOSPHATE- 500 POUNDS/ACRE of 20%ANALYSIS SUPERPHOSPHATE
3. THE PROPERTY OWNER (OR HOMEOWNER'S ASSOCIATION) IS RESPONSIBLE FOR
MULCH- 1.5 TONS SMALL GRAIN STRAW/ACRE(APPROXIMATELY 60 BALES) WHERE DA = DRIANAGE AREA (ACRES)
\ \ \ � � / \ELEVATION AREA (SF) VOLUME (CF) CUM. VOLUME (CF) MAINTAINING THE STORM WATER CONTROLS ACCORDING TO THE APPROVED MAINTENANCE - -
( ) \ \\ \ \ ANCHOR- CRIMP STRAW INTO SOIL WITH MACHINE OR TACK NTH LIQUID ASPHALT AT 400 GALLONS/ACRE OR EMULSIFIED ASPHALT AT 300 GALLONS/ACRE. WATER QUALITY VOLUME REQUIRED = (i.o x 0.518 x 6.33 x 43,560)/12 = 11,903 CF
722 131 0 0 PLAN AND DIRECTION OF THE CITY OF GREENSBORO. \ / �` ,? \
\723 365 248 248 WATER QUALITY VOLUME PROVIDED:
\
R/P-RAPAPRON
\ \ \ - - BOTTOM ELEVATION = 727.00
724 617 491 739 (SEEDETA A V /L) A \ FILTER DIAPHRAGM
- _ \ COLLECTOR PIPES TO BE ASTM C-33 SAND (IF DAM IS BUILT
725 934 776 1,515 \ \ \ \ \ I 10.5' � WA CAPPED ON BOTH ENDS FROM FINE GRAIN OR CLAYEY SOILS) WA ELEVATION = 730.00
V TER QUALITY VOLUME PROVIDED = 29,650 CF
\�
726 1,317 1,126 2,640 \ 4 4-INCH SOLID WALLED SCH 40 PVC PIPE EQUIVILENT RUNOFF CAPTURED:
/,r\ -INCH NO. 20 DISCHARGES TO DAYLIGHT IN DISSIPATOR.
/ i, \ (�\ SLOTTED SCH 40 PVC VARMIT SCREEN i0 BE PLACED ON ENDS DRAINAGE BASIN: 6.33 AC.
\ LJ J COLLECTOR PIPE Rv = 0.518
PERMANENT SEDIMENT STORAGE IN FOREBAY-STAGE-STORAGE TABLE \ \ �� (2xDIA) 29,650 CF = (RUNOFF x 6.33 x 0.518 x 43,560) / 12
ELEVATION AREA (SF) VOLUME (CF) CUM. VOLUME (CF) - \ h / AO \ \ ` RUNOFF = (29,650 x 12) / (6.33 x 0.518 x 43,560)
Q ` \ _ 4.5' r(2x
4.5' Un TOTAL RUNOFF CATPURED FOR WATER QUALITY TREATMENT = 2.49 INCHES
722 131 0 0 ����� \ \ \ (3xDIA) DI (3xDIA)
\ O P ti RELEASE RATE OF REQUIRED FIRST FLUSH 1" RUNOFF:
723 365 248 248 \
Qua W �3 \ FLOW Mi,903 AXIIMUMFHEADR= 8.331D728 DOOM 1 33'728.33
723.50 483 212 460
AVERAGE HEAD= 1.33' / 3 = 0.4433'
HOLE DIAMETER= 1.75"
c� O �3/ AREA OF HOLE= 0.017 SF
4 / FILTER DIAPHRAGM DETAIL AVERAGE FLOW THROUGH ORIFICE = 0.6(0.017 SF)(SQURT(2x32.2xO.4433')
" �,� \ 28 �2 - NTS 4-INCH No, 20 AVERAGE FLOW THROUGH ORIFICE = 0.054 CFS
9 SLOTTED SCH 40 PVC
('� COLLECTOR PIPE DETENTION TIME = 11,903 CF 0.054 CFS = 220,426 SEC.
` ,2� 2� \ 4-INCH SOLID WALLED SCH 40 PVC PIPE /
\ 0PDISCHARGES i0 DAYLIGHT IN DISSIPATOR. DETENTION TIME = 220,426 SEC. 3600 SEC. HR = 61.23 HRS
2 VARMIT SCREEN TO BE PLACED ON ENDS / /
--722:' �\ 6 �26 - 1" RUNOFF WATER QUALITY DETENTION TIME: 2.55 DAYS
P- APAP O ELEVATION OF WEEP HOLE INVERT = 727.00
54" DIA C.A.P. �` S \
TRASH RACK (�� � � � � COLLECTOR PIPES TO BE
, � EEOE A/ �� 723 ��� 2Q ,2s \ CAPPED ON BOTH ENDS
RELEASE RATE OF ENTIRE WATER QUALITY STORAGE PROVIDED:
6' XON BARS
\ (���,� � 725 26 2 �23 0�3 PLAN VIEW 29,650 CF STORAGE PROVIDED FROM 727.00-730.00
54' DIA. \ \ I �✓ \ MAXIMUM HEAD = 730-727 = 3.00'
AVERAGE HEAD= 3.00' / 3 = 10'
726 �2c� �m DOWNSTREAM SLOPE HOLE DIAMETER= 1.75"
TOP GRATE ��� AREA OF HOLE= 0.017 SF
CONSIST OF 1/BAR \ I 724 N�Zo F 3 AVERAGE FLOW THROUGH ORIFICE = 0.6(0.017 SF)(SQURT(2x32.2x1.O')
SOLID ALUM \ 723\ y0� W 3.0 20, AVERAGE FLOW THROUGH ORIFICE = 0.082 CFS
6" O.C. EACH WAY 722 36"R/SEW/ MIN DETENTION TIME = 29,650 CF / 0.082 CFS = 361,585 SEC.
54"TRASH RAC/( _ DETENTION TIME = 361,585 SEC. / 3600 SEC./HR = 100.44 HRS
1" RUNOFF WATER QUALITY DETENTION TIME: 4.19 DAYS
o FILTER DIAPHRAGM ELEVATION OF WEEP HOLE INVERT = 727.00
ANTI-VORTEX \ 2Q 90TTO�OEPOND
SUPPORT PLATES \ z c ��3 =72200- \ ASTM C-33 SAND (IF DAM IS BUILT
FROM FINE GRAIN OR CLAYEY SOILS)
\ 0 01 26 - /(�� PRINCIPLE SPILLWAY:
TOP VIEW ISOMETRIC SHOWING �m/ v ��> > S v v RISER= 36" CAP RISER
FLOW
� 1 � 26 - \ BARREL=18" CAP BARREL
ANTI-VORTEX SUPPORTS F50 10 \\ & >2)s SO \ NOTE: A 18" BARRELL HAS BEEN CHOSEN IN ORDER TO REDUCE THE POST-DEVELOPMENT
54" DIA C.A.P. �1 \ O O - 24-HOUR STORM EVENTS, UP TO AND INCLUDING THE 10-YEAR STORM EVENT,
54' DIA. ,�9 \ 0 4-INCH SOLID WALLED SCH 40 PVC PIPE
TRASH RACK I� WI VARMIT SCREEN DAYLIGHT IN
PLACED SON ENS OUTFLOW TO AT OR BELOW THE RESPECTIVE PRE-DEVELOPMENT RATES.
� 1 FF5���" � �� 2� \)3 O I EMERGENCY SPILLWAY:
PE) Nf7NT'P0 1L.-FF5 O / _ DESIGN STORM= 100 YR
ANTI-VORTEX � \ - FILTER I 4-INCH No. 20 EMERGENCY SPILLWAY TYPE: 20' WIDE GRASS LINED WEIR
SUPPORT PLATES tl 2 =5,78>SF -9 - SLOTTED SCH 40 PVC 4" PVC UNDERDRAIN24 M L VOLUME= �� \ DIAPHRAGM 50
COLLECTOR PIPE NVERT IN FILTER=829.90ELEVATION C WEIR = SS LICONTROL SECTION: GRASS LINED WEIR
2 RISER �68U�f F `?'O 4:1 SIDE SLOPES
LOCKING HARDWARE �V v BOTTOM WIDTH= 20'
TO STABILIZE TRASH 36" C.A.P. T \ - - - FLOW I DISCHARGE = 1 DEPTH 0.4 CFS
ILDIAPHRAGM AIL
GUARD (4 REQUIRED) RISER T
ALUMINUM ANGLE \ - - _
BOLT WELDING TO � � � � I�, Nrs VELOCITY OVER WEIR LIP = 1.99 FT/SEC
ANTI-VORTEX PLATE \ \ �= o \ FREEBOARD AND SETTLEMENT= 1.07'
f� 36" DIA. �{ DETAIL TOP OF DAM ELEVATION= 733.00
FOR SECURING TRASH RACK \ 013 \ \ 0 Z EXIT SECTION: GRASS LINED TRAPEZOIDAL CHANNEL
SIDE VIEW TO RISER BARREL - _ �Ia DISCHARGE =18.62 CFS
X o�m BIZ 4:1 SIDE SLOPES
x/ 33.33% SLOPE
o1FF �� FF5 S \ BOTTOM WIDTH = 20'
TRASH RACK DETAIL ��
N Z S \ FF n= 0.030
FF / I FF; DEPTH= 0.13'
NTS ` VELOCITY= 6.98 FT/SEC
20'W/DEGRASS LINED
EMERGENCY SPILL WAY S FF
�SEEDETA/LJ F FF ANTI-FLOTATION CALCULATION
5 RISER VOLUME= 5' X 7.07 SF = 36 CF
-FF R/P-RAPAPRON BARREL VOLUME= 10' X 1.77 SF = 18 CF
\ / / NOTE:
(SEE DETA/L) MDC 11: VEGETATION VOLUME DISPLACED => 54 CF
THE FOLLOWING CRITERIA APPLY TO VEGETATION IN AND AROUND BOUYANCY FORCE= ( 54 CF)(62.4 PCF)= 3,370 LBS
THE WET POND: VOLUME OF CONCRETE REQUIRED= 3,370 LBS/ (150-62.4)= 38.50 CF
(A) THE DAM STRUCTURE OF THE POND, INCLUDING FRONT AND SIZE= 7' X 7' X 2' = 98 CF
BACK EMBANKMENT SLOPES, SHALL BE VEGETATED WITH FACTOR OF SAFETY = 2.55 ..... 98 CF / 38.50 CF = 1.99
54" TRASH RACK- ALUMINUM ANGLE & ROD NON-CLUMPING TURF GRASS; TREES AND WOODY SHRUBS
SHALL NOT BE ALLOWED.
COVER (6" O.C.) TRASH RACK WITH ANTIVORTEX DEVICE
10' MIN. COMPACTED EARTH R r HTC SCALE
_----------- TOP OF BASIN ELEV= 733.00---------------------------------------------------------------- -------------- TOP OF BASIN ELEV= 733.00- ---------_ 20 0 10 20 40 so
100 YR - 24 HR ELEV. = 731.93 --�'07 EMERGENCY SPILLWAY ELEVATION: 731.50
CD -------------------------------------------------------
10 YR - 24 HR_ELEV._= 730.64 TOP OF TRASH FILTER DIAPHRAGM
---2 YR= 24-HR ELEV.- 73Q--
RACK = 731.00 12" 7 �.
---------------------------------------------------- 24" M SEE DETAIL
TOP OF RISER ELEV = 730.00 BOTTOM OF TRASH 9 12" PF IM z Shoo IN FEET
/Slpp FOREBAY TO BE CLEANED OUT 1 YR - 24 HR ELEV. = 729.96 RACK = 729.00 5�° m I inch = 20 ft.
c� WHEN IT'S DEPTH AT PERMANENT
POOL LEVEL) IS REDUCED TO 3.5 O 1.75" DEWATERING ORIFICE W 36" CAP m TOP=t728.92 PROJECT TITLE:
FEET OR LESS r7 TRASH GUARD EXTENDING 3" RISER o 2.0'
BELOW AND ABOVE ORIFICE m MIN THE TOWNES AT BERMUDA RUN
1.75" DEWATERING ORIFICE INVERT ELEV = 727.00 _ TOP OF SHELF_727.50 0
--- -------------_----------------------- -- ------------ 4" PVC UNDERDRAIN PHASE 1
6:1 SLOPE BOTTOM OF SHELF: 726.50 INVERT IN FILTER=724.12
o I DAVIE COUNTY FARMINGTON TOWNSHIP
PERMANENT POOL TO BE CLEANED FILL RISER WITH
TOP OF BAFFLE ELEV.-726.00 5.0' WIDE CONCRETE TO f BERMUDA RUN,NORTH CAROLINA
cW -------------- -- Q� OUT WHEN IT'S DEPTH (AT ELEVATION 725.00 58.00 LF OF 1 g' 18" INVERT OUT:t724.00 OWNER/DEVELOPER:
FOREBAY = 2,640 CF O PERMANENT POOL LEVEL) IS CAP BARREL @ 1.72% HENSON REALTY, LLC
HYDRAFLOW HYDROGRAPH ROUTING RESULTS: REDUCED To 4.5 FEET OR LESS
1 -yr Pre-Development Flowrate: 3.576 cfs FOREBAY ENTRANCE T0�'� TOP OF CONCRETE
y p � ----_ � ^j• � Ln ANCHOR = 723.00 a FLANGE CONNECTION WITH 249 DEARDOM WAY
1 - r Inflow: 13.56 cfs / - o--- BE 1.0 DEEPER THAN--- L6
y S( THE FOREBAY EXIT / PERMANENT POOL WITH NEOPRENE GASKET (TYP) \ /�\/�\/�� CHAPEL HILL, NC 27516
Op COMPACTED 0 16,803 CF 4. \ \ \ \ RIP-RAP PAD (SEE DETAIL) \\ \\ \\ 336-707-9799
1 -yr Outflow: 0.1 37 cfs EARTH BAFFLE_ l�q QF, o NV. = 725.00 18" INVERT IN FILTER \\//\�/ /�\
1 -yr Max. Water Surface Elevation: 729.96 TOP OF PERMANENT SEDIMENT S�OpE F O N QOTIG OF CAP CONNECTION TO BE WELDED \\ \\ \\ \\ \ \\ \\ \\ ��
1 . RISER = 722..°010 12' = 724.42 \ S G
STORAGE IN FOR EB A Y:723.50 5 1 \/�\, � � �\/\\ � � � � � � � � � � � � �\ 17�N A
___ __ ____ TOP OF PERMANENT SEDIMENT STORAGE _____�-_ � �� � � i•��•
2-yr Pre-Development Flowrate: 6.442 cfs IN PERMANENT POOL:722.50 6" +� moans FESS/
7' SQUARE BOTTOM OF CONCRETE 4" PVC UNDERDRAIN + o o j
2-yr Inflow: 18.09 cfs BOTTOM OF BOTTOM OF BASIN ELEV = 722.00 ANCHOR = 721.00 BOTTOM=t721.42
2-yr Outflow: 0.902 cfs Since19�4 � S 0 �
FOREBAY: 722.00 INVERT = ±724.00 + ><>hleerin 9 Incnc
2-yr Max. Water Surface Elevation: 730.08 ♦ r
34' I ]E>mgn>m��res Snnrev�y®�� Pll�>m>m�res � 035014 �
♦(i� 3-i 1-24- ♦U�
4" SOLID WALLED SCH 40 PVC 4609DunndasDrive Greennab-,NC27407 ♦�� ♦��
PIPE @ 0.50% SLOPE Ph-e33 -54-8875NS5#F-336-854.8876 ��� ♦�NGI N�i���j1
10-yr Pre-Development Flowrate: 15.65 cfs (4) 24" X 6" STEEL PLATES WELDED �((TT((`'
10-yr Inflow: 30.48 cfs SECURELY IN PLACE o ���� NOTE: PROJECT: 763-30 DESIGN BY: DF DRAWN BY: DF ''�'�' ���o-
10-yr Outflow: 1 4.2 6 C f s 6 o �v SOIL COMPACTION O F HAUNCHES H:\0WI 30 2019 Pr.1..1.\Paul MiI. \Bermuda Run\Drawings\Phase 1\R.rm Run C. f,,�. Pl...3.0-W,f,,,h..4.0-
10-yr Max. Water Surface Elevation: 730.64 <9�A BELOW 18" CAP BARREL TO BE SHEET DESCRIPTION:
F` CUT-OFF TRENCH, EXCAVATED
_�C THEN BACKFILLED AND COMPACTED INSPECTED, VERIFIED, AND CERTIFIED WET DETENTION
100-yr Pre-Development Flowrate: 32.82 cfs 24 TO 95% STANDARD PROCTOR WITH BY A GEOTECHNICAL ENGINEER. POND #2 DETAIL
100-yr Inflow: 50.08 cfs
12'
100-yr Outflow: 33.61 cfs 4.0' LOW PERMIABILITY SOIL
� SCALE: 1"= 20' DATE: NOVEMBER 17, 2023
REVISIONS SHEET NO.:
100-yr Max. Water Surface Elevation: 731 .93 :
3-11-24
Top of Dam Elevation: 733.00 WET DETENTION POND #2 SECTION TH R U BERM AND S P L WA YS C6.2
Freeboard Provided: 1 .07' Nrs