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Home My WebLink AboutSW8040430_APPROVED PLANS_20050518STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SW .�J� DOC TYPE ❑ CURRENT PERMIT APPROVED PLANS ❑ HISTORICAL FILE ❑ COMPLIANCE EVALUATION INSPECTION DOC DATE�5�� YYYYMMDD r� / . r N❑TF M0VL32---�/ 32------❑k.I-FL-E1'� VFGETATED -` Trl; FILLER WHEN .� NEW DIGH iS ADDED IN DRAI'N%F- LASMLNT, Fli-TER ❑uTLET ELE- 30.00 PE❑ JEC E❑U.`;DARY S1-I4LE OUTLET IIvJV LLF -- 32.t,-'• G= 1.91 CF T (p,4,TIJNAL METHHD;�- PROJECT B❑UNDA ' 1 / HDa IPE--� c„ y 1 1 1 1 lNSTALL 10 OF C,U�FlNG ANC CURB MILL I A L-]W FOIN� ❑F P(dRKING/I II I I-IM EL-E-34GL INVERT �!E i it 1 Elk/ NOW OR FOPML RI Y PARTNERS RECYCLING, JNC_ D.B31893, 'r,'G.224 N G5o49'02"E � � I 1 1 I I I I I I I I I I I I I I I I I I I I I I I I l — _ p J C X 50'JOi�!E�DLI�I_��-E`1��Cr F2f`N~ _-- AND PRIVA'1T',�-�CE SS EAS!-M.FNT JUL.0 I BEUNI'ARY ,—��C`Pv�i 33 � ;,�, � E I R 5 0 5 o�a ' �0 i `��,) `� ��1 �;) �� C�1' _ . \ _ -- — --- ------------ _ _--=_ __— --- -----34---— ------=4-- - �---------= 3 ----- 34-- --- —__— =---^ —��33 _--_--------35---------------35--------- ----5--=—=_—�.=w r_-36---------------36 ----------35-- — — — — ------35 ------ ----� . EIR ECM 5 r ----------3fi~� ,�F'RIJJi=1_; ❑,JLI T 3❑ 1NllnkY iH LEGEND SYm, PROPERTY BOUNDARY LINE SHEET FLOW INDICATION SHEET FLOW ; BEARINGS AND DISTANCES S 36'46'37" W 979.46' EXISTING TOPOGRAPHICAL LINE —�— GRASSED/ RIP RAP CHANNEL PROPOSED TOPOGRAPHICAL LINE WETLAND BOUNDARY EDGE OF PAVEMENT SPOT ELEVATION PL oN CHECKLIST OWNER/SITE INFORMATION SEE TITLE BLOCK ENGINEER AND FIRM SEE TITLE BLOCK LEGEND NORTH ARROW AS SHOWN ON PLAN SCALE SEE TITLE BLACK REVISION Nil. AND DATE SEE TITLE BLOCK MEAN HIGH WATERLINE NA DIMENSIONED PROPERTY/PROJECT BOUNDARY VICINITY MAP, SHOWN ON PLAN PROPOSED AND EXISTING CONTOURS ROAD AND SCALE DETAILS (SHEEET 2) WETLAND BOUNDARIES CALCULATIONS (SHEET 3 AND 4) DRAINAGE AREA VEGETATED BUFFERS EC` 11 EXI T I'�vC �CI\CRE E �,1GL l_Ii�,1C a Eli -X, S l iN� RONI ROD 120 I I I SCALE N THI_D �1'IF--i I_r'— S%N E A D S a,--E ERRY, HWY 172 irivi-j 100 4— VICINITY NTS APPROVED --0�� "' NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION DIVISION OF WATER QUALITY 100-M41(- ZovS 10 INLET CHANNEL OUTLET STRUCTURE DETAIL NOT TO SCALE NOTE: A. 24' CMP (ALUMINIUM) RISER WITH SCREEN AND SCUM BAFFLE TYP. V CONTROL PIPE AT 32.00. RISER RIM INVERT 32.50. SCREEN TO HAVE MINIMUM 4' X 4' OPENINGS, B. 12' CMP ❑UTFALL INVERT 30.50, OUTLET INV, 30.25. C. RIP RAP TO EXTEND DOWN SLOPE. SEE OUTLET PROTECTION DETAIL, D. OUTLET WIER-5' WIDE AT INV 32.80 W/ TRASH GAURD 4' X4' ❑PENINGS TYP. E. 4' EMERGENCY DRAIN AT INV 30,50 W/ GATE VALVE, F, ANTI SEEP COLLARS G. 6' ABC STONE UNDER PAD, H. 12' CONCRETE PAD 3' X 3',CAST WITH CMP BOTTOM OF CMP 6' BELOW TOP OF PAD. I. 6' RIP RAP 9' THICK, 3' ABC STONE WITH FILTER FABRIC UNDERLAYMENT, 95' 5' -------JFMPSIRh3Y_e041~IrLE_3 RR_- ----------------------- - --------PFftMAt�ENILI4L_ELE2.DD_ __________________ _ 8: } 15,00 6:1 .1 e? 28.00 28.00 INV. 11' WIDE 30 .50 VEGETATED SHELF. 6:1 FOREBAY AND POND SECTION NTS NOTE: 1, POND TO BE SEEDED WITH BERMUDA GRASS 2. VEGETATED SHELF TO BE PLANTED WITH WETLAND SPECIES SEE POND DETAIL !ICK WALLS CEMENT PLI 7 oLt. i 1u1� n—n MIN, 5'-4' PVMT, PB CURB & GUTTER �B PLAN OUTLET STRUCTURE SEE DETAIL SHEET 3 INV. 30.25 SECTION 'B-B' NOTE: 1, 4' DEEP X 8' WIDE CONCRETE COPING ALL AROUND BASIN CASTING. 2, ALL CONCRETE TO BE CLASS 'A' 3, FOR CASTING DETAIL SEE SD 14-03 CATCH BASIN SD 2-01 NOT TO SCALE JW' VEGETATED BUFFER ":\7xE DETAIL A ENERGY DISSAPATOR DETAIL NET TO SCALE 0 B PLAN VIEW NOTES: ALL SIDE SLOPES TO BE 2:1 MINIMUM, 6' RIP RAP, 18' THICK WITH 3' OF ABC STONE UNDERLAYMENT. DETAIL APLIES FOR WING WAL INLETS AND OUTLETS AND ENERGY DISSIPAT❑R AT WET POND OUTLET, APRON WIDTH AND LENGTH DESIGNED USING FIG 806,8,1-3 IN MANUAL (PAGE 8,06,5-7, WHERE DISSIPAT❑R IS IN OR PART OF A CHANNEL THE WIDTH IS TO EXTEND TO THE TOP OF THE CHANNEL. SECTION A -A ®z©mmm WET 1 OUTLETOMMOMM ©®©®®® MOMIME MEMNON MENNEN MENNEN MENNEN MEMNON VEGETATED FILTER DETAIL N TS 10' 30' W W W W W W W W .Y W 'r. • W W W w W W W A W W W o m RECIEVING A W W W W L W W W W W W W OUTLET PlP W W W W W W W w INV 30.25 RIP RAP W W w w ENERGY DISSIPATOR LEVE SPREADER PLAN .V y W SECTION A -A F- — — — — — — — — — — — — — — — — - I I _ - F I � i L i l L _ I v _ � — �i 1 I 2' PIPE 8" +n LEVEL SPREADER SECTION N TS NOTE; POUR CONCRETE LEVEL SPREADER CHANNEL USING 2' PIPE AS WIER. PIPE MUST BE LEVEL. FOR FULL LENGTH OF DEVICE. POUR ENDS OF CHANNEL SOLID W/ CONCRETE. NOTE: 10SAFETY SHELF TO HAVE A SLOPE NO GREATER THAN 6:1. PLANT SHELF WITH SUITABLE WETLAND SPECIES BLUE FLAG IRIS, ARROWHEAD AND PICKEREL WEED. POND SIDE SLOPES NOT TO EXCEED 3: 1 AND TO BE PLANTED WITH BERMUDA GRASS. 'f i III all III Pre -Development Inflow Hydrograph, I0-yr storm Inflow Hydrograph, 50-yr storm Runoff Coefficient, C 0.9 t < 1.25 Tc 0 0) = Op/2*(1-cos(pi*t/Tp)) t < 1.25 Tc Q (t) = Qp/2*(1-cos(pi't1Tp)) Hydraulic Length, L 220 ft It } 1.25 Tc Q = 4.34*0p*exp( 1.3'(t/Tp)) t a 1.25 Te Q = 4.34'Qp*exp(-1.3*(tfrp)) Elevation Change, H 1 ft Watershed Area, A 2.51 acres Permanent Level 32.00 ft Permanent Level 32.00 R Time of Concentration, Tc 3.97 min Tc = (L3M)° �$51128 10-yr Intensity, 1 7.42 in/hr I = 252/(30+Tc) Riser Length 4:C,. ft Ctrl. Pipe Diameter 1.00 in Peak Outflow 0.01 cfs Riser Length 4.00 ft Ctrl. Pipe Diameter 1.00 in Peak Outflow 5.03 cfs 50-yr Intensity, 1 9,14 in/hr I = 338/(33+Tc) Elevation 32.E 0 It Elevation 32.00 It Peak Stage 32.39 ft Elevation 32.50 ft Elevation 32.00 ft Peak Stage 32.51 ft Weir Coef. 3,00 Orif. Coef. 0.52 Weir Coef. 3.00 Orif. Coef. 0.52 10 yr Flow, Qa 16.90 cfs Q = CIA Orif. Coef. 0.60 Q Pre -Development 16.90 Orlf. Coef. 0.60 Q Pre -Development 20.83 50-yr Flow, Qa 20.83 cfs Q = CIA Peak Inflow 17.63 Pond Bank 33.00 Pond Bank 33: 0 Post -Development Riser 2 Length 0.00 ft Barrel Orif. Coef 0.65 Sec Riser Length 0.00 ft Barrel Orif. Coef 0.65 Impervious Area 1,96 acres Top El. 0.00 ft Diameter 2.00 in Top EI. 0.00 fl Diameter 12.00 in Runoff Coefficient, C 0.94 Bot: El. 000 ft Elevation 30.50 R Bol. El. 0.00 ft Elevation 30.50 ft Hydraulic Length, L 220 ft Weir Coef. 3.00 Number 1.00 Weir Coef. 3.00 Number 1.00 Elevation Change, H 1 ft Orif. Coef. 0.60 Orif. Coef. 0.60 Area, A 2.51 acres Time of Concentration, Tc 3,97 min Tc = (L'/ I)°.3a5/128 int: 0110 10-yr Intensily,1 7.42 in/hr I = 252/(30+Tc) Tp = 26.87 Riser 2 Riser 2 Riser Riser Riser Structure Total Tp = 29.81 Riser 2 Riser 2 Riser 2 Riser Riser Riser Structure Total 50-yr Intensity,1 9.14 in/hr I = 338/(33+Tc) Time t Gin Storage Stage Ctri Pipe Weir Oriface Outflow Weir Oriface Outflow Total Barrel Outflow Time t Gin Storage Stage Ctri pipe Weir Oriface Outflow Weir Oriface Outflow Total Barrel Outflow rain cfs cu ft ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs min cfs cu ft ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs 10-yr Flow, Qp 17.63 cfs Q = CIA 0 0.00 0.00 32.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4.09 0.00 0.00 0.00 0.00 32.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4.09 0.00 50-yr Flow, Qp 21.73 cfs Q = CIA 3 0.43 0.00 32.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4.09 0.00 2.98 0.53 0.00 32.00 0,00 0.00 0.00 0.30 0.00 0.00 0.00 0.00 4.09 0.00 5 1.68 69.57 32.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4.09 0.00 5.67 1.88 85.74 32.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4.09 0.00 dQ, 10 yr storm 0.73 cfs 8 3.63 341.04 32.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4.10 0.00 8.35 3.95 389.12 32.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4.10 0.00 dQ, 50 yr storm 0.90 cfs 11 6.09 926.96 32.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4.11 0.00 11.04 6.56 1025.53 32.01 0.00 0.00 0.00 0,00 0.00 0.00 0.00 0.00 4,11 0.00 13 8.82 1909.11 32.02 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4.13 0.00 13.73 9.52 2083.81 32.02 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4.14 0.00 10 yr Required Storage 1.64E+03 cu fl S = dQ*Tc*1.39'60 16 11.54 3330.46 32.04 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4.16 0.00 16.42 12.59 3619.19 32.04 0.00 0.00 0.00 0.00 0.00 0,00 0.00 0.00 4.17 0,00 50 yr Required Storage 2.25E+03 cu R S = dQ*Tc'1.39'60 19 14.00 5190.92 32.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4.20 0.00 19.10 16.52 5648,83 32.06 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4.21 0.00 21 15.95 7447.44 32.08 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4.25 0.00 21.79 18.08 0150.49 32.08 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4.26 0.00 Time to Peak 24 17.20 10018.15 32.10 0,01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.30 0.01 24.48 20.06 11064.29 32.11 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.32 0.01 10-yr Storm Depth (P) 4.80 in 6 hr runoff 27 17.63 12790.52 32.13 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.35 0.01 27.16 21.31 14297.67 32.15 0,01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.38 0.01 50-yr storm depth (P) 6.40 in 6 hr runoff 30 17.20 15632.27 32.16 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.40 0.01 29.85 21.73 17732.54 32.18 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.44 0.01 Soil Curve Number (CN) 69 32 15.95 18404.28 32.19 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.46 0.01 32.54 21.28 21234.72 32.22 0.01 0,00 0.00 0.00 0.00 0.00 0.00 0.01 4.51 0.01 SCS Curve Number (CN) 96 35 14.12 20974.25 32.21 0,01 0.00 0,00 0.00 0.00 0.00 OAO 0.01 4.50 0.01 35.23 20,01 24664.66 32.25 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.57 0.01 Soil Storage Capacity (S) 0.41 S = 1000/CN - 10 38 12.40 23249.32 32.24 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.55 0.01 37.91 18.05 27888.56 32.28 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.63 0.01 10-yr Runoff Depth (Q*) 4.34 in Q* = [(P-0.2*S)]^2/(P + 0.8*S) 40 10.89 25246.77 32.26 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.58 0.01 40.60 16.05 30796.74 32.31 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.68 0.01 10-yr Runoff Volume (V) 39615 cu it V = Q*A 43 9,56 27000.45 32.27 0,01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.61 0.01 43.29 14.28 33383.00 32.34 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.73 0.01 50-yr Runoff Depth (Q') 5.93 in O' = [(P-0.2-S)]" 2/(P + OA'S) 46 8.40 28540.07 32.29 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.64 0.01 45.97 12.70 35682.96 32.36 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.77 0.01 50-yr Runoff Volume M 54021 cu ft V = Q'A 48 7.37 29891.73 32.30 0.01 0.00 0,00 0.00 0.00 0.00 0.00 0.01 4.67 0.01 48.66 11.29 37728.29 32.38 0.01 0.00 0.00 0.00 0.00 0,00 0.00 0.01 4.80 0,01 51 6.47 31078,35 32.31 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.69 0.01 51.35 10.05 39547.13 32.40 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.83 0.01 10-yr Time to Peak (Tp) 26.87 min Tp = V/1.39Qp 54 5.68 32120.04 32.32 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.70 0.01 54.03 8.93 41164.54 32.41 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.86 0.01 50-yr Time to Peak (Tp) 29.81 min Tp = V/1.390p 56 4.99 33034.48 32.33 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.72 0.01 56.72 7.95 42602.80 32.43 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.88 0.01 59 4.38 33837,18 32,34 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.73 0.01 59.41 7.07 43881.72 32.44 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.91 0.01 Stage Storage Function 62 3.85 34541.76 32.35 0.01 0.00 0.00 0.00 0,00 0.00 0.00 0.01 4.75 0.01 62.10 6.29 45018.92 32A5 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.92 0.01 Permanent Pond Level 32.00 ft 64 3.38 35160.18 32.35 0,01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.76 0.01 64.78 5.69 46030.07 32A6 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.94 0.01 S Z 67 2.97 35702.94 32.36 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.77 0.01 67.47 4.97 46929.12 32.47 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.96 0.01 CONTOUR INCR ACCUM 70 2.61 36179.27 32.36 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.78 0.01 70.16 4.42 47728.45 32.46 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.97 0.01 CONTOUR AREA VOL VOL STAGE In S In Z Zest 73 2.29 36597.27 32.37 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.78 0.01 72.84 3.93 48439.11 32.48 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.02 4,98 0.02 [sq ft cu fl cu ft[ft] 75 2.01 36964.05 32.37 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.79 0.01 75.53 3.50 49070.89 32.49 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.02 4.99 0.02 78 1.76 37285.85 32.37 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.79 0.01 78.22 3.11 49632.61 32.49 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.02 5.00 0.02 32.00 6150 0 0 0.00 0.0000 0.0000 0.0000 81 1.55 37568.15 32.38 0.01 0,00 0.00 0,00 0.00 0.00 0.00 0.01 4.80 0.01 80.90 2.77 50131.74 32,50 0.02 0.00 0.00 0.00 0.00 0.00 0.00 OA2 5.01 0.02 33.00 7,600 6,875 6,875 1.00 8.8356 0.0000 0.0713 83 1.36 37815.77 32.38 0.01 0.00 0.00 0.00 0,00 0.00 0.00 0.01 4.80 0.01 83.59 2.46 50575.48 32.50 0.02 0.00 0.00 0.00 0.00 1.23 0.00 0.02 5.02 0.02 34.00 8,400. 8,000 14,875 1.00 9.6074 0,0000 0.1518 86 1.19 38032.94 32.38 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.81 0.01 86.28 2.19 50969.36 32,51 0.02 0.00 0.00 0.00 0.01 1.71 0.01 0.02 5.02 0.02 35.00 10,000 9,200 24,075 3.00 10.0889 1.0986 0.2435 89 1,05 38223,37 32.38 0,01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.81 0.01 88,97 1.95 51318.48 32.51 0.02 0.00 0.00 0.00 0.01 2.05 0.01 0.03 5.03 0.03 36.00 12,000 11,000 35,075 4.00 10.4652 1.3863 0.3521 91 0.92 38390.32 32.38 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.81 0.01 91.65 1.73 51627.59 32.51 0.02 0.00 0.00 0.00 0.02 2.31 0.02 0.04 5.03 0.04 94 0.81 38536.66 32.39 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.82 0.01 b 1.02 D = Un 152'zii)i/Un (42141)J 97 0.71 38664.88 32.39 0.01 0.00 0.00 O.OD 0.00 0.00 0.00 0.01 4.82 0.01 Ks 1.02E*05 KS = S2/Z1n 99 0.62 38777.21 32.39 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.82 0.01 102 0.55 38875.58 32.39 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.82 0.01 Peak Discharge WIs) 105 0.48 38961.70 32.39 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.82 0.01 107 0.42 39037.04 32.39 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.82 0.01 Pre -Development Post -Development 110 0.37 39102.94 32.39 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.83 0.01 City Consultant City Consultant 113 0.33 39160.54 32,39 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0,01 4.83 0.01 f0 yr 16.90 17.63 116 0.29 39210.85 32.39 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.83 0.01 50 yr 20.83 21.73 118 0.25 39254.76 32.39 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.83 0.01 121 0.22 39293.06 32.39 0.01 0.00 0,00 0.00 0.00 0.00 0.00 0.01 4.83 0.01 124 0.19 39326.41 32.39 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.83 0.01 126 0.17 39355.44 32.39 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.83 0.01 129 0.15 39380.66 32.39 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.83 0.01 WET POND CALCULATIONS DRAINAGE AREA 2.51 ACRES FORE BAY VOLUME PERCENT IMPERVIOUS 78.1 % PP VOLUME 13519 CU FT 4 FOOT DEEP POND 85% TSS FOREBAY VOL SAIDA 5.1 % REQUORED=.2(92813) 2703.8 CU FT MINIMUM REQUIRED SURFACE FORE BAY VOL AREA AT PERM POOL PROVIDED (4' DEEP) 3481 CU FT =.052 X 2.51 X 43560 5576 SF SURFACE AREA PROVIDED AT ORIFICE SIZING PERMANENT POOL 6150 SF 02=6860/172800 0.040 CFS MINIMUM REQUIRED VOLUME 05=68601432000 0.016 CFS SIMPLE METHOD Rv = .05 +.009(78A) 0.7529 CHOOSE A 1" CIRCULAR 1 " ORIFICE TEMP VOLUME REQUIRED AVERAGE HEAT] = (1"/12')X,753X2.51X43560 6860 CU FT = (1'-(.5)(2"/12))12 0.729167 FT SURFACE AREA PROVIDED AREA 0.005461 SF AT PP 6150 SF Q=CdA(SQ RT(2gh) 0.026232 CFS .016<.026<.040 STORGE ELE ABOVE PP = 678816100 (USE 1') 33 FT SURFACE AREA AT 33 FT 7600 SF TEMP VOLUME PROVIDED =(7600+6150)12 X (33-32) 6875 CU FT PERMANENT POOL VOLUME (SUM OF THE VOLUMES OF THE FOREBAY AND POND BELOW THE PP LEVEL) ADDITION OF THE VOLUMES FOR THE FRUSTRUM OF TWO PYRAMIDS V=1/3H(B +SQRT(B'B'O +IT) H= 4 FT FOR THE POND B= 1089 SO FT B'= 4281 SO FT V= 10039 CU FT H= 4 FT FOR THE FOREBAY B= 236 SO FT B.= 1734 SQ FT V= 3481 CU FT PERMANENT POOL VOLUME= 13519 MICHAEL C GALLANT, PE, PA PG BOX 4039 SURF CITY, NC 28446 VET DETENTION CALCULATIONS ATLANTIC PLAZA n 1 � y r J. � i +7 7 _F T �„ �I _ j: + �� 'i i f + k{' I 1 1 _ 5 +� 1 5 i ,, ti- °� e , �` 1�• 1 ' i �+ 1�. � _ 4 rl ik i,' a ,, i Je Ji 1 1 � � �. � , J + ,.J. J 1 4 ,J. 1 1, 11 1 {_1 ilJS. .' 4 1i1 +'•, i 'P� L TT \1 T R/W NCGS F MONUMENT "BORN" R/W ------ ------ PF LH I' T F\'-- L 4 � R/W R/W (� R/W rWr RECEIVED PROJ # MAY 0 3 2005 DWQ - r �IW ..1,5 1, Yw •'LI . ' 11 I. IJ M �11-Irp'loo�- i�iel!*f V I.I 4;-9 l.a l.f i Ili vl., I'' I!r_IlLf. l•}I AiTV ilf tM�'�II.