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Home My WebLink AboutSW4231202_Plansheet - SCM Detail_20240311 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 #1 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: = 1,452 SF (SHF AREA AROUND FOREBAY EXCLUDED FROM AREA CALCULATIONS) ON-SITE DRAINAGE AREA TO POND #1 5.02 ACRES MINIMUM REQUIRED PLANTINGS: 50 PLANTS EL SF 1, SF = 363 PLANTS (4" container) .entering the BMP facoility. 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 739 1.700 0 0 stabilize the site as soon as possible OFF-SITE DRAINAGE AREA TO POND #1 0.02 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 = 5.04 ACRES 739.50 1,965 916 916 y q p has been / will be contacted for the determination of whether the proposed dam is TOTAL DRAINAGE AREA TO POND 1 5.04 ACRES Iris Virginica (common name: Blue Flag Iris): 61 plants (4" Container) that some source of water is especially g y p p p p P PROPOSED BUA TO POND = 2.84 ACRES (56.35%) provided, es eciall Burin dry periods. This will reduce lent loss and provide the Sagittoria Lancifolia (common name: Bulltounge): 61 plants (4" container) new materials with a chance to establish root growth.MAIN POOL STAGE-STORAGE TABLE Pontederia Cordata (common name: Pickerelweed): 61 plants (4" container) governed by or exempt from the Dam Safety Law.�i PERMANENT SEDIMENT STORAGE: ON-SITE BUA TO POND #1 2.82 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: 740 TO 741.50 => 672 CF OFF-SITE BUA TO POND #1 (100% OFFSITE AREA) 0.02 ACRES Asclepias incarnate (common name: Swamp Milkweed): 61 plants (4" container) STORAGE PROVIDED IN MAIN POOL: 739 TO 739.50 => 916 CF 739.50 1.965 0 0 TOTAL BUA TO POND #1 2.84 ACRES Lobelia Cardinalis (common name: Cardinal Flower): 61 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): 61 plants (4" container) help establishment. TOTAL FOREBAY VOLUME: 3,693 CF 740 2,248 1,053 1,053 PLANTS & MIXTURES PLANTING RATES/ACRE PLANTING DATES MAIN POOL VOLUME @ ELEVATION 745.00: 21,051 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 #1 2.84 ACRES (56.35%) 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 00-150 LBS AUG. 15-OCT. 15 % FOREBAY VOLUME TO PERMANENT POOL VOLUME: 3,693 CF / 21,051 CF = 17.54% 741 2,865 2,557 3,610 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 1 742 3,553 3,209 6,819 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 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) 743 4,314 3,934 10,753 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: 366 plants plants. TALL FESCUE& 100 LBS& FEB. 15-MAY 1 THE SEDIMENT STORAGE ELEVATION AND EXCLUDES FOREBAY VOLUME & AREA: 744 5,128 4,721 15,474 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: 242' 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) 744.50 5,492 2,655 18,129 AS AMENDED THROUGH 1995 spr aying.ra AND THE RULES AND REGULATIONS AS p y g. MAX WATER DEPTH OVER SHELF: SHELF: 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 two TALL FESCUE& 50 Las& NOV. 1-FEB. 1 inches. WET DETENTION POND CONSTRUCTION SEQUENCE: SERICEA LESPEDEZA 60 LBS/ACRE (UNSCARIFIED) VOLUME OF SHELF Vshelf : 0.50 x 0.50' x 242' x 3.0' = 182 CF 745 6. 997 2,922 21,051 SUBCHAPTER 2K - DAM SAFETY. EVEN IN THE CASE WHERE THE DAM ( ) 1. EXCAVATE POND BOTTOM ELEVATION OF POND. MAIN POOL VOLUME (EXCLUDING 12" SEDIMENT STORAGE): 21,051 CF 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 STAGE-STORAGE TABLE THE ABOVE NOTED DAM SAFETY REQUIREMENTS, I, AS THE QUALIFIED 2. GRADE DAM EMBANKMENT, KMENT, 20' EMERGENCY SPILLWAY, AND VEGETATED SHELF. GERMAN MILLET 30 Les AREA AT BOTTOM OF SHELF: 5,492 SF FOR ENTIRE POND STORAGE ABOVE THE PERMANENT POOL ELEVATION 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 = (21,051 CF - 182 CF) / 5,492 SF = 3.80' 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 ELEVATION AREA (SF) VOLUME (CF) CUM. VOLUME (CF) WELFARE, AND DOWNSTREAM PROPERTY. UNDERSTAND THAT THIS STATE- POND. ENSURE THE INSIDE BOTTOM AND SIDE SLOPES OF THE POND ARE 3.8' WATER QUALITY POOL AVE. DEPTH, 57% B.U.A. increase the PH or iron sulfate and sulfer to lower the PH. The lime or iron sulfate must be mixed uniformly PONDS DRAINAGE BASIN WILL BE CONVEYED TO THE WET RYEGRAIN 25 LBS(RYGRAIN MUST BE KEPT 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 1.7536% SURFACE AREA 745 8,780 0 0 OPERATOR OF THE POND AND DAM FROM THE LEGAL DUTIES, OBLIGATIONS, DETENTION POND VIA A NETWORK OF STORM SEWER PIPES 1.7536% 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 8 LBS(HULLED) APRIL 15-JUNE 30 REQUIRED = 100 x 5.04 AC x 43,560 SF/AC = 3.850 SF 745.50 9,867 4,662 4,662 9 g 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 = 3.80')= 745.00 meet the requirements specified and a soil analysis furnished stating that the soil meets all the requirements 746 10,432 5,075 9,737 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 = 6,197 SF (AREA EXCLUDES FOREBAY) PERMANENT WET DETENTION POND NOTES: FROM AN EROSION CONTROL DEVICE TO A WET DETENTION POND. z.TRIPE E AREA TO BE SEEDED TOE C.MINIMUM SURFACE OE 4-6 INCHES. TH ANO UNIFORM. The following criteria apply to vegetation in and around the Wet detention pond: NETWORK WILL ENTER THE POND AT AN ELEVATION EQUAL 747 11,605 11,019 20,755 (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- non-clumping turf grass; trees and woody shrubs shall not be allowed; and SLOPES. MIx WITH THE SOIL(RATES ARE BELOW). 747.50 12,212 5,954 26,709 FINAL PLAT OR CERTIFICATE OF OCCUPANCY. THE STORMWATER CONTROL IS TO BE (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 WITH 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. EQUIPMENT OR CULTIPACK AFTER SEEDING. FOR 57% B.U.A. 748 12,833 6,261 32,971 PRIOR TO ISSUANCE OF THE FINAL CERTIFICATE OF OCCUPANCY. 5.MULCH IMMEDIATELY AFTER SEEDING AND ANCHOR MULLCH. 749 14,119 13,476 46,447 2. THE TOWN OF BERMUDA RUN AND THEIR ASSIGNS HAVE RIGHT TO ACCESS THE -RATES: AGRICULTURAL LIMESTONE- 2 TONS/ACRE Rv= 0.563 750 15,461 14,790 61,237 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 I I SUPERPHOSPHATE- 500 POUNDS/ACRE OF 20%ANALYSIS SUPERPHOSPHATE s MULCH- 1.5 TONS SMALL GRAIN STRAW/ACRE(APPROXIMATELY 80 BALES) 3. THE PROPERTY OWNER (OR HOMEOWNER'S ASSOCIATION) IS RESPONSIBLE FOR / \ WHERE DA = DRIANAGE AREA (ACRES) TOTAL FOREBAY STAGE-STORAGE TABLE MAINTAINING THE STORM WATER CONTROLS ACCORDING TO THE APPROVED MAINTENANCE / ANCHOR- CRIMP STRAW INTO SOIL WITH MACHINE OR TACK WITH LIQUID ASPHALT ( ) � s.° � I AT 400 GALLONS/ACRE OR EMULSIFIED ASPHALT AT 300 GALLONS/ACRE. WATER QUALITY VOLUME REQUIRED = (1.0 x 0.563 X 5.04 x 43,560)/12 = 10.300 CF ELEVATION AREA (SF) VOLUME (CF) CUM. VOLUME (CF) PLAN AND DIRECTION OF THE CITY OF GREENSBORO. °' WATER QUALITY VOLUME PROVIDED: 740 149 0 0 / // OMB BOTTOM ELEVATION = 745.00 i q 741 557 353 353 P ' ROUN'F ° '� \ FILTER DIAPHRAGM TOP ELEVATION = 747.50 - - - ° " I v //� l COLLECTOR PIPES TO BE ASTM C-33 SAND (IF DAM IS BUILT WATER QUALITY VOLUME PROVIDED = 26,709 CF 742 896 727 1,080 s° _ / NpgNp� /1 CAPPED ON BOTH ENDS 30 FROM FINE GRAIN OR CLAYEY SOILS) i /� y� S' �f Q / 10.5 EQUIVILENT RUNOFF CAPTURED-4-INCH SOLID WALLED SCH 40 PVC PIPE DRAINAGE BASIN: 5.04 AC. 743 1,292 1,094 2,174 ' `J� / J / i 4-INCH NO. 20 DISCHARGES TO DAYLIGHT IN DISSIPATOR. OTC _ ° SLOTTED SCH 40 PVC VARMIT SCREEN TO BE PLACED ON ENDS Rv = 0.563 COLLECTOR PIPE 744 1,746 1,519 3,693 oo , l^� //� - ' T�O \ O 2,3' 26,709 CF = (RUNOFF x 5.04 x 0.563 x 43,560) / 12 0.5xDIA) RUNOFF = (26,709 x 12) / (5.04 x 0.563 x 43,560) PERMANENT SEDIMENT STORAGE IN FOREBAY-STAGE-STORAGE TABLE _ < TOTAL RUNOFF CATPURED FOR WATER QUALITY TREATMENT = 2.59 INCHES ---------------- T / 4.5' 1. 4.5' co ELEVATION AREA (SF) VOLUME (CF) CUM. VOLUME (CF) / ; : J / 5'9 � y v / (3xDIA) DIA CAP (3xDIA) Q0 ,� RELEASE RATE OF REQUIRED FIRST FLUSH 1" RUNOFF: 740 149 MAXIMUM HEAD = 746.06-745.00 = 1.06'0 0 / a0�y P V O �O / N 10,300 CF STORAGE PROVIDED FROM 745-746.06 741 557 353 353 / �oQoaO \ �rx� ' > / / (2xDIA) AVERAGE HEAD= 1.06' / 3 = 0.3533' y 9 741.50 717 319 672 HOLE DIAMETER= 1.75" AREA OF HOLE= 0.017 SF FILTER DIAPHRAGM DETAIL AVERAGE FLOW THROUGH ORIFICE = 0.6(0.017 SF)(SQURT(2x32.2xO.3533') (Vj4g NTS 4-INCH No. 20 AVERAGE FLOW THROUGH ORIFICE = 0.049 CFS SLOTTED SCH 40 PVC COLLECTOR PIPE 4-INCH SOLID WALLED SCH 40 PVC PIPE DETENTION TIME = 10,300 CF / 0.049 CFS = 210,204 SEC. DISCHARGES TO DAYLIGHT IN DISSIPATOR. VARMIT SCREEN TO BE PLACED ON ENDS / /DETENTION TIME = 210,204 SEC. 3600 SEC. HR = 58.39 HRS 1" RUNOFF WATER QUALITY DETENTION TIME: 2.43 DAYS ELEVATION OF WEEP HOLE INVERT = 745.00 ° \ CAPPED ON BOTH ENDS 54' DIA C.A.P. � � \ / � >Q �A4 SQ `` \� PERMANENTPOOL COLLECTOR PIPES TO BE O 2 / =6 197SF RELEASE RATE OF ENTIRE WATER QUALITY STORAGE PROVIDED: TRASH RACK �� 1N O 43 - \ / PLAN VIEW / 26,709 CF STORAGE PROVIDED FROM 745-747.50 �40 \ / MA/NPOOL VolUME= MAXIMUM HEAD - 747.50-745.00 = 2.50' 6" X 6" SPACING 4 x - Ids `3 '1/ 21,051 CF AVERAGE HEAD= 2.50' / 3 = 0.83' 54" DIA. ON BARS BOTTOM OF POND 39S0 / DOWNSTREAM SLOPE HOLE DIAMETER= 1.75" -I I / X' - - =739.00 ; / / / AREA OF HOLE= 0.017 SF -36"R/SERW/ i / 3 AVERAGE FLOW THROUGH ORIFICE = 0.6(0.017 SF)(SQURT(2x32.2x0.83') TOP GRATE _ / �S D 54"TRASHRACK / i O 3,0 CONSIST OF 1/2"B MI /AVERAGE FLOW THROUGH ORIFICE = 0.075 CFS / �$' S - - i I / �► 1 � MIN DETENTION TIME = 26,709 CF 0.075 CFS = 356,120 SEC. SOLID ALUMINUM BAR / / ' -R / l I / DETENTION TIME = 356,120 SEC. / 3600 SEC./HR = 98.92 HRS 6" O.C. EACH WAY / i j A / / 1" RUNOFF WATER QUALITY DETENTION TIME: 4.12 DAYS FILTER DIAPHRAGM ELEVATION OF WEEP HOLE INVERT = 745.00 / i / ASTM C-33 SAND (IF DAM IS BUILT EARTHEN / / / FROM FINE GRAIN OR CLAYEY SOILS) ANTI-VORTEX FORESAY 1 Q p �j -aAFFLE- - / x / � PRINCIPLE SPILLWAY SUPPORT PLATES 3,693 CF s - FLow�" _ / RISER= 36" CAP RISER BARREL=18" CAP BARREL TOP VIEW ISOMETRIC SHOWING (SEE DETA1L) \ , �� - - - NOTE: A 18" BARRELL HAS BEEN CHOSEN IN ORDER TO REDUCE THE POST-DEVELOPMENT s s ) sz� 24-HOUR STORM EVENTS, UP TO AND INCLUDING THE 10-YEAR STORM EVENT, ANTI-VORTEX SUPPORTS 170 p 4-INCH SOLID WALLED SCH 40 PVC PIPE OUTFLOW TO AT OR BELOW THE RESPECTIVE PRE-DEVELOPMENT RATES. 54' DIA C.A.P. - ''/ O DISCHARGES TO DAYLIGHT IN DISSIPATOR. sr sr EMERGENCY SPILLWAY: TRASH RACK 54 DIA. O - - �, ,sO AP - - 'r/ j / / VARMIT SCREEN TO BE PLACED ON ENDS / F/L TER I- J � _ _ DESIGN STORM= 100 YR _ < 0 D/APH AGM EMERGENCY SPILLWAY TYPE: 20' WIDE GRASS LINED WEIR TA VJ / SLOTTED O. 2O 40 PVC ELEVATION OF WEIR = 748.50 COLLECTOR PIPE INVERT IN NFILTERA829.90 ANTI-VORTEX CONTROL SECTION: GRASS LINED WEIR SUPPORT PLATES 12" m ah/ems 4:1 SIDE SLOPES o A 24" / , �TrA 5 V Pam/ - BOTTOM WIDTH= 20' RISER 12 J O �`O O i-'' /I FLOW DEPTH = 0.39' O i ° ° DISCHARGE = 15.99 CFS LOCKING HARDWARE - � �� / �,/Q TO STABILIZE TRASH - - - �� O - - - - -� / o FILTER DIAPHRAGM DETAIL VELOCITY OVER WEIR LIP = 1.90 FT/SEC 36" C.A.P. GUARD (4 REQUIRED) RISER -` - /J� Nrs ° ``` ` --" : � FREEBOARD AND SETTLEMENT= 1.11' ALUMINUM ANGLE 0 00 TOP OF DAM ELEVATION= 750.00 BOLT WELDING TO �� 5 ° - RIP-RAPAPRON F ANTI-VORTEX PLATE / / W EXIT SECTION: GRASS LINED TRAPEZOIDAL CHANNEL 36" DIA. - - �� >�, ' n / / (SEEDETA/L) DETAIL (err DISCHARGE -15.99 CFS FOR SECURING TRASH RACK - P / / 4:1 SIDE SLOPES SIDE VIEW TO RISER BARREL � � -�� T� , - / � 33.33% SLOPE BOTTOM WIDTH = 20' ° \ i 20'W/DE GRASS L//VED / �i n= 0.030 EMERGENCY SPILL WAY DEPTH= 0.12' SEE DETAIL TRASH RACK DETAIL `- GJO - / VELOCITY= 6.51 FT/SEC N TS / / /%/ ANTI-FLOTATION CALCULATION RISER VOLUME= 4' X 7.07 SF = 29 CF BARREL VOLUME= 10' X 1.77 SF = 18 CF NOTE: VOLUME DISPLACED => 47 CF MDC 11: VEGETATION THE FOLLOWING CRITERIA APPLY TO VEGETATION IN AND AROUND BOUYANCY FORCE= ( 47 CF)(62.4 PCF)= 2,933 LBS THE WET POND: VOLUME OF CONCRETE REQUIRED= 2,933 LBS/ (150-62.4)= 33.48 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 = 2.93 ..... 98 CF / 33.48 CF = 2.93 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 uTC SCALE TOP OF TRASH -------TOP OF BASIN ELEV = 750.00-----------------------------------------------------------------TOP OF BASIN ELEV 750.00= -- RACK - 748.50 -- -------- ----- ---------_ 20 0 10 20 40 so O 100 YR - 24 HR ELEV. = 748.89 Ln ----------2 YR= 24 HR ELEV.= 747 57 ----------- 12"EMERGENCY SPILLWAY ELEVATION: 748.50 - - - - - - - - CNJ 10 YR - 24 HR ELEV. = 748.02 FILTER DIAPHRAGM _ ?• ---------------------------------------------------------------------------------------------------------------------------o --------------------------------------------------------------------------- 24" ' SEE DETAIL �. - ------ _ m s ( ) IN FEET TOP OF RISER ELEV - 747.50 BOTTOM OF TRASH 9 12" Q� z goo xSlpp FOREBAY TO BE CLEANED OUT 1 YR - 24 HR ELEV. -747.39- RACK = 746.50 5�° m 1 inch = 20 ft. c� WHEN ITS DEPTH AT PERMANENT r ( 1.75" DEWATERING ORIFICE W 36" CAP z POOL LEVEL) IS REDUCED TO 3.5 TRASH GUARD EXTENDING S' RISER m TOP=t747.00 2 0' PROJECT TITLE: FEET OR LESS BELOW AND ABOVE ORIFICE om MIN THE TOWNES AT BERMUDA RUN 1.75" DEWATERING ORIFICE INVERT ELEV = 745.00 _ TOP OF SHELF_745.50 0 --- -------------_----------------------- -- ------------ 4" PVC UNDERDRAIN PHASE I 6:1 SLOPE BOTTOM OF SHELF: 744.50 INVERT IN FILTER=743.10 o I DAVIE COUNTY FARMINGTON TOWNSHIP PERMANENT POOL TO BE CLEANED FILL RISER WITH TOP OF BAFFLE ELEV.-744.00 5.0' WIDE CONCRETE TO f BERMUDA RUN,NORTH CAROLINA N -------------- -- Q� OUT WHEN IT'S DEPTH (AT ELEVATION 743.50 49.64 LF OF 1 g' 18" INVERT OUT:t743.00 OWNER/DEVELOPER: FOREBAY = 3,693 CF O PERMANENT POOL LEVEL) IS CAP BARREL @ 1.01% HENSON REALTY, LLC HYDRAFLOW HYDROGRAPH ROUTING RESULTS: REDUCED To 5.5 FEET OR LESS S�Qo FOREBAY ENTRANCE TO/'� TOP OF CONCRETE 1 -yr Pre-Development Flowrate: 2.847 cfs �. � �j• � � ANCHOR = 741.00 `, a FLANGE CONNECTION WITH 249 DEARDOM WAY 1 -yr Inflow: 1 1 .86 cfs -- o BE 1.0 DEEPER THAN--- cD PERMANENT POOL WITH NEOPRENE GASKET (TYP) �/ �/ �/ CHAPEL HILL, NC 27516 y THE FOREBAY EXIT 4 \\\\\ \\ \\ RIP-RAP PAD (SEE DETAIL) /\\\/\\\/\� 336-707-9799 1 -yr Outflow: 0.123 cfs TOP OF PERMANENT SEDIMENT COMPACTED S� 21,051 CF o a NV. = 743.50 STORAGE IN FOREBAY: g:1 SCOPE EARTH BAFFLE_ oq oe� N oT 18" INVERT IN FILTER 1 -yr Max. Water Surface Elevation: 747.39 F 4 jOM OF CAP ° CONNECTION TO BE WELDED \\ \\ \\ \\ \ \\ \\ \\ ♦� RISER = 740.°00 12' = 743.20 // // // // S // // // // // � ♦ CA 41 BOTTOM OF ___ __ TOP OF PERMANENT SEDIMENT STORAGE -__ . ♦♦��i•��R�� 2-yr Pre-Development Flowrate: 5.129 cfs FOREBAY: 740.00 -' IN PERMANENT POOL:739.50 6" +� �a1�5 FESS/ i 7' SQUARE BOTTOM OF CONCRETE \4�PVC UNDERDRAIN + 2-yr Inflow: 15.53 cfs BOTTOM OF BASIN ELEV = 739.00 I ANCHOR = 739.00 BOTTOM=t740.20 INVERT = t743.00 + >hl�><>hlc�c��'><>h1�9 Inc • �, 2-yr Outflow: 0.675 cfs 30 Since 1974 � S A � 2-yr Max. Water Surface Elevation: 747.57 r r ]Engineers Surveyors Planners 0350 4 ♦(i� 3-i 1-24- ♦U� 4" SOLID WALLED SCH 40 PVC 4609DunndasDrive Greenab-,NC27407 ♦e% ♦�� PIPE @ 0.50% SLOPE Ph-e33 -854-8ll05NS5#F-336-854.8876 �� ♦�1/GIN��i��1 10-yr Pre-Development Flowrate: 12.46 cfs (4) 24" X 6" STEEL PLATES WELDED 10-yr Inflow: 25.44 cfs SECURELY IN PLACE �((TT((`' o �� NOTE: PROJECT: 763-30 DESIGN BY: DF DRAWN BY: DF '4' 4 ' i'�*♦♦♦ 10-yr Outflow: 1 1 .28 cfs 6 �� SOIL COMPACTION OF HAUNCHES y � CUT-OFF TRENCH, EXCAVATED BELOW 18" CAP BARREL TO BE H:\0WI 30 2019 Pr.1..1.\Paul MiI. \Bermuda Run\0r ing,\Phase 1\R.rm Run C. f,,�. Pl...3.0-W,f,,,h..4.0- 10-yr Max. Water Surface Elevation: 748.02 9 SHEET DESCRIPTION: � o THEN BACKFILLED AND COMPACTED INSPECTED, VERIFIED, AND CERTIFIED WET DETENTION 100-yr Pre-Development Flowrate: 26.13 cfs 24 TO 95% STANDARD PROCTOR WITH BY A GEOTECHNICAL ENGINEER. POND #1 DETAIL 100-yr Inflow: 40.99 cfs 100-yr Outflow: 29.80 cfs 4.0' LOW PERMIABILITY SOIL 12' � SCALE: 1"= 20' DATE: NOVEMBER 17, 2023 REVISIONS SHEET NO.: 100-yr Max. Water Surface Elevation: 748.89 : 3-11-24 Top of Dam Elevation: 50.00 WET DETENTION POND 1 SECTION THRU BERM AND SPILLWAYS C5.2 Freeboard Provided: 1 .11 NTS