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HomeMy WebLinkAbout20090312 Ver 1_Stormwater Info_200903250 9- 0 3 1 2 DESIGN CALCULATIONS CMLISCTE WORK WAKE COUNTY CONnNUUM OF CARE RALEIGH, NORTH CAROLINA MARCH,2009 `• s ? .w d Q, th,AF Ffl0WL MAR 2 J 2009 DENR - WATER CA Lai. ITY WETLANDS AND STORMWATER BRANCH CLH design, p.a. Regency Park, 400 Regency Forest Drive, Suite 120 Cary, North Carolina 27918 Phone: (919) 319-6716 lax.- (919) 319-7916 " ? A 'ice I r v . 1 v t ?,, 'y [[[}}} t F,•At f ? ?8s"d ?lrb •??;@ ^ ? l"il•. `^?-.r? {? `"/ ? # . .{ b yy r i ???" = { + € SITE mG )o 4? ! i 11 s d r w e r " u ay t ? c r {1' ?p ! " d ` V hw F - " - * , Ir ".tm , ' .? .mil - t??''Jr ^.-. J . i n F b? 1 =r. ,. fff j ## , 4 , , r 1 { = yy , 1' , i f ti z F )_ 3 q USGS QUAD MAP o (1 ?AP WYA& MEM EW,,M WAKE COUNTY CONTINUUM OF CARE Scale S A NMOOK RD, LVBM, MC Date 3/16/09 Drawn by, JPK -az a ° z ?1 a b ? ? f x Y till l;? .. ?<}? j 4 ¢ f f"• ± t t„,q, m I ? 3t t? a .. a a Ft» d S - F t .? . }r % R , Kv ? p4C 4 & .b 4 7 WAKE COUNTY SOILS WAKE COUNTY SURVEY CONTINUUM OF CARE scak ?ism MAP LSSUE DAM '19D0 S=R, Dates 3/16/09 - - Drawn bv: lPK STORMWATER AND EROSION AND SEDIMENT CONTROL PLAN WAKE COUNTY CONTINUUM OF CARE SUNNYBROOK RD. RALEIGH, NC MARCH 2009 PROJECT DESCRIPTION: A new mental health facility is proposed at the intersection Sunnybrook Road and Falstaff Road in Raleigh, North Carolina. The site is 17.86-ac and is mostly wooded with the exception of a small gravel parking area that is used for overflow parking for the Wake Med campus. STORMWATER MANAGEMENT: The project is located within the Neuse River watershed and a Neuse River Stream buffer is located on the site as shown on the plans. This project is exempt from City of Raleigh Stormwater Regulations per Section 10-9003(b)(8) of Raleigh City Code. However, North Carolina Buffer Rules require that stormwater is conveyed via diffuse flow to a Neuse River Buffer. Given the existing topography of the site, it is not possible to construct a Best Management Practice (BMP) that will provide diffuse flow to the buffer. In order to comply with the Neuse River Buffer Rules a stormwater BMP capable of providing 30% nutrient reduction, prior to discharging to a buffered stream, must be provided. In order to comply with this requirement, a stormwater wetland is proposed to convey treated runoff to the adjacent stream. The project includes removal of the existing gravel parking area, and disturbance of approximately 12.00 acres. There will be substantial clearing and grading for the construction of this proposed work and the clearing limits are shown on sheets C-401 and C-402. EROSION AND SEDIMENT CONTROL PRACTICES: 1. Silt Fence: Silt fence will be utilized to filter sediment laden runoff in locations where the drainage area is less than 1/ acre per 100-ft of fence. 2. Tree Protection Fencing: Tree protection fencing will be installed to protect existing trees that are intended to remain. In some locations, silt fence will serve as tree protection fence. 3. Inlet Protection: Block and gravel inlet protection devices will be installed at new inlets as they are constructed to filter sediment-laden runoff prior to the runoff entering the storm drainage system. 4. Construction Entrance: Temporary gravel construction entrances will be utilized to minimize soil being tracked off the site by construction traffic. 5. Outlet Protection: Riprap outlet protection aprons will be installed at outlets as they are constructed to slow storm-water velocities and dissipate energy to protect downstream channels from erosion. 6. Sediment Skimmer Basins: Sediment traps and basins will be installed to filter concentrated sediment laden runoff prior to discharge from the site. 7. Channel Matting: Straw or excelsior matting will be installed in permanent channels and swales to stabilize the seedbed and promote vegetative growth. Check Dams: Rock check dams will be installed in permanent channels to reduce flow velocities and erosion in the channel. 9. Temporary Slope Drains: Slope Drains will be installed to prevent erosion over long newly graded slopes. etc _03 , 2 STORMWATER MANAGEMENT DESIGN N (1'D Q I O? 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Hydrograph Inflow Peak Outflow (cfs) Hydrograph No. type Hyd(s) description (origin) 1-Yr 2-Yr 3-Yr 5-Yr 10-Yr 25-Yr 50-Yr 100-Yr 1 SCS Runoff ------ 3.14 6.00 --- --- 16,94 ------ ------ 36.32 PRE-AREA-1 (TO POA A) 2 SCS Runoff ----- 24.67 34.76 ----- --- 6712 ---- ---- 117.40 PRE-AREA-2 (TO POA-B) 5 SCS Runoff ----- 0.84 1.91 -- 620 -- ---- 14.12 POST-AREA-1 (TOTAL TO POA-A) 6 SCS Runoff ------ 19.99 26.64 ------- ------ 47.11 ------ ------- 77.71 POST-AREA-2 (TO POA-B) 7 SCS Runoff ------- 15.65 22.06 ------ ------ 42.58 ------- ------ 74.48 POST-AREA-3 (TO POA-B) 8 SCS Runoff ------- 0.62 0.76 ------- ------- 1.17 ------ ------ 1.76 POST-AREA-4 (TO POA-B) 9 Combine 6,8 20.61 27.39 ------ ----- 48.28 ------ ---- 79.47 COMBINE POST-2 & 4 11 Reservoir 9 1.78 7.93 34.43 ----- ----- 67.18 Area to Wetland 13 Combine 7, 11, 15.73 22.87 --- ---- 71.98 -- -- 136.52 TOTAL Q TO POA-B Proj. file: 08-106 PRE VS POST.gpw Run date: 03-18-2009 Hydraflow Hydrographs by Intelisolve DATE t _ t 13-Mar-09 PR JECT NO PROJECT NAME O Wake Count Contiuum of Care 08-106 u LOCATION BY Raleiah. NC JPK WETLAND Drainage Area, (DA) = 8.74 ac (includes 1 acre of additional impervious for future development) Impervious Area c= 0.95 4.46 ac Pervious Area c= 0.30 4.28 ac Cc = 0.63 Wetland Surface Area % Impervious = 51 % Design Storm Rainfall 1.00 in (Typically 1-in) Runoff Coeff. (Rv = 0.05 + 0.009 (% Imperv.)) = 0.51 in/in Required Volume (design rainfall)(Rv)(DA) = 16,157 cf (3,630 cf minimum req.) Depth of Temporary Pool (Dplants) = 12 in (12-in max) Required Surface Area = 16,157 sf Surface Area Provided= 17,972 sf Surface Area at 1" Storage Volume= 22,217 sf 1" Storage Volume Provided= 16,157 cf Temp. Storage Depth above Dewatering Hole = 1.0 ft Diameter of Dewatering Hole = 2.00 in Detention (Draw-Down) Time = 3.2 days T days=(Req. Temp. Storage Vol / (0.6 * A * (2*g*(h))^1/2) * 86400 (where h = one third temp. storage depth measured to centroid of orifice) Wetland Zones Required Elevation Range % of SA Forebay surface area required = 1797 sf 36" deep 10.00% Deep pool at outlet required = 1797 sf 18-36" deep 10.00% Shallow water (low marsh) required = 7189 sf 0-6" deep 40.00% Shallow land (high marsh) required = 5392 sf 12" above perm. pool 30-40% Wetland Zones Provided Elevation Range % of SA Forebay surface area = 1,924 sf 207.00-204.00 10.71% Deep pool at outlet = 1,653 sf 206.50-204.00 9.20% Shallow water (low marsh) = 7,230 sf 207.00-206.50 40.23% Shallow land (high marsh) = 6,061 sf 208.00-207.00 33.72% s:11319W0011caIcs108-106 PondSize-Wetland.XLS pruned: 3/18/2009 4:14 PM Page 1 of 1 STORM SEWER SYSTEM 1 ILL L LLL ' I I I ? 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J B V ' N M n O st O 0 LO LO LO Lr) LO LO 0 C) f U W 0 U N N N N r N N N N . } Q C U - Z 7 O Z Z > I a . . U U 0 L W J J w It N 0 M 0 M O Lo' N O O W M O O ? Y O :D v N N N N LO LO C? 0 - O 0 U 0 ?° 0 3 N N N N M OO N N N N Q C) < w W ? - n c 11 v L ? 0 V LO V co Vl I OD U ? U _ ? I _ W ? C' W co Is co a 2 O V) J x U Li W Z F- rn 0 0 LL ;9-03 1 2 OUTLET PROTECTION DESIGN DATE 1/30/2009 IECT NAME PROJECT N Count Continuum of Care Facility 08-106 ?TION BY h, NC RBT CHECKEDE JPK Storm Outlet Structure FES No.= A8 Pipe Dia= 36 in Q10 = 27.25 cfs Qfull = 193.55 cfs Vfull = 27.35 fps From Fig. 8.06.b.1: From Fig. 8.06.b.2: Storm Outlet Structure FES No.= B7 Pipe Dia= 15 in Q10 = 4.62 cfs Qfull = 4.36 cfs Vfull = 3.54 fps From Fig. 8.06.b.1: From Fig. 8.06.b.2: Q10/Qfull = VNfull = V= Zone D50 DMAX Riprap Class Apron Thickness Apron Length Apron Width = 3xDia Q10/Qfull = VNfull = V= Zone D50 DMAX Riprap Class Apron Thickness Apron Length Apron Width = 3xDia DESIGN PHASE PRELIM CONSTR REVISION RECORD OTHER (SPECIFY) 0.14 0.68 18.7 fps 3 10 in 15 in 1 22.5 in 24 ft 9ft 1.06 1.13 4.0 fps 2 8 in 12 in B 18 in 7.5 ft 4 ft PROJECT NAME Wake Count Continuum of Care Facility LOCATION Raleioh. NC Storm Outlet Structure FES No.= C7 Pipe Dia= 15 in Quo = 5.18 cfs Qfull = 5.00 cfs Vfull = 4.07 fps From Fig. 8.06.b.1: From Fig. 8.06.b.2: Storm Outlet Structure FES No.= D2 Pipe Dia= 15 in Q1o = 2.28 cfs Qfull = 5.33 cfs Vfull = 4.34 fps From Fig. 8.06.b.1: From Fig. 8.06.b.2: Zone D5o DMAx Riprap Class Apron Thickness Apron Length Apron Width = 3xDia Zone D5o DMAx Riprap Class Apron Thickness Apron Length Apron Width = 3xDia DATE 1/30/2009 PROJECT NO 08-106 BY RBT CHECKED BY Q1o/Qfull = V/Vfull = V= Q1o/Qfull = VNfull = V= DESIGN PHASE PRELIM CONSTR REVISION RECORD OTHER (SPECIFY) ?L ?L L? L? 1.04 1.14 4.6 fps 2 8 in 12 in B 18 in 7.5 ft 4ft 0.43 0.96 4.2 fps 2 8 in 12 in B 18 in 7.5 ft 4ft DATE 39843 PROJECT NAME PROJECT NO Wake County Continuum of Care Facility 08-106 LOCATION BY Raleigh, NC RBT CHECKED BY JPK Storm Outlet Structure DESIGN PHASE PRELIM CONSTR REVISION RECORD OTHER (SPECIFY) FES No.= E3 Q10/Qfull = 0.57 Pipe Dia= 15 in V/Vfull = 1.02 Q10 = 3.56 cfs V = 5.2 fps Qfull = 6.29 cfs Vfull = 5.12 fps From Fig. 8.06.b.1: Zone From Fig. 8.06.b.2: F-IM . s 3 Length 2 D50 = 8 in DMAx = 12 in Riprap Class = B Apron Thickness = 18 in Apron Length = 7.5 ft Apron Width = 3xDia = 4 ft TEMPORARY SEDIMENT SKIMMER BASIN DESIGN Storm Outlet Structure FES No.= A8 Pipe Dia= 36 in Qio = 27.25 cfs Qfull = 193.55 cfs Vfull = 27.35 fps From Fig. 8.06.b.1: From Fig. 8.06.b.2: Storm Outlet Structure FES No.= B7 Pipe Dia= 15 in Qio = 4.62 cfs Qfull = 4.36 cfs Vfull = 3.54 fps From Fig. 8.06.b.1: From Fig. 8.06.b.2: DATE 1/30/2009 PROJECT N 08-106 BY RBT CHECKEDE JPK DESIGN PHASE PRELIM CONSTR REVISION RECORD OTHER (SPECIFY) Qio/Qfull = 0.14 V/Vfull = 0.68 V = 18.7 fps Zone = 3 D5o = 10 in DmAx = 15 in Riprap Class = 1 Apron Thickness = 22.5 in Apron Length = 24 ft Apron Width = 3xDia = 9 ft Q10/Qfull = 1.06 V/Vfull = 1.13 V = 4.0 fps Zone = 2 D5o = 8 in DmAx = 12 in Riprap Class = B Apron Thickness = 18 in Apron Length = 7.5 ft Apron Width = 3xDia = 4 ft DATE 1/30/2009 PROJECT NAME PROJECT NO Wake Count Continuum of Care Facility 08-106 LOCATION BY Ralei h, NC RBT CHECKED BY JPK Storm Outlet Structure FES No.= C7 Pipe Dia= 15 in Q10 = 5.18 cfs Qfull = 5.00 cfs Vfull = 4.07 fps From Fig. 8.06.b.1: From Fig. 8.06.b.2: Storm Outlet Structure FES No.= D2 Pipe Dia= 15 in Q10 = 2.28 cfs Qfull = 5.33 cfs Vfull = 4.34 fps From Fig. 8.06.b.1: From Fig. 8.06.b.2: Q10/Qfull = V/Vfull = V= Zone D50 DMAx Riprap Class Apron Thickness Apron Length Apron Width = 3xDia Q10/Qfull = V/Vfull = V= Zone D50 DMAx Riprap Class Apron Thickness Apron Length Apron Width = 3xDia DESIGN PHASE PRELIM CONSTR REVISION RECORD OTHER (SPECIFY) 1.04 1.14 4.6 fps 2 8 in 12 in B 18 in 7.5 ft 4ft 0.43 0.96 4.2 fps 2 8 in 12 in B 18 in 7.5 ft 4ft DATE 3-25-09 PROJECT NAME PROJECT NO Wake Count Continuum of Care Facility 08-106 LOCATION BY Raleigh, NC RBT CHECKED BY JPK Storm Outlet Structure FES No.= E3 Pipe Dia= 15 in Q10 = 3.56 cfs Qfull = 6.29 cfs Vfull = 5.12 fps From Fig. 8.06.b.1: From Fig. 8.06.b.2: Zone D50 DMAx Riprap Class Apron Thickness Apron Length Apron Width = 3xDia Q10/Qfull = VNfull = V= Storm Outlet Structure (Wetland Outfall) FES No.= A18 Q10/Qfull = Pipe Dia= 24 in VNfull = Q10 = 34.43 cfs V = Qfull = 75.03 cfs Vfull = 23.85 fps From Fig. 8.06.b.1: From Fig. 8.06.b.2: Zone D50 DMAx Riprap Class Apron Thickness Apron Length Apron Width = 3xDia DESIGN PHASE PRELIM CONSTR REVISION RECORD OTHER (SPECIFY) 0.57 1.02 5.2 fps 2 8 in 12 in B 18 in 7.5 ft 4ft 0.46 0.97 23.2 fps 6 14 in 21 in 2 31.5 in 20 ft 6ft CHANNEL DESIGN DATE DESIGN PHASE 3/03/09 SD PROJECT NAME PROJECT NO DD Wake Count Continuum of Care 08-106 CD /X LOCATION BY REV Raleigh, NC RBT OTHER CHECKED BY (SPECIFY) JPK PERMANENT LINING - Permissible Velocity and Capacity Channel No: CHANNEL-1 Drainage Area: 0.21 ac Sta from: Design Fequency: 10 yrs Sta to: Time of Conc: 5 min Section Length: 155 ft Intensity: 7.24 in/hr Section Slope: 10.30 % Runoff Coeff: 0.47 Ret Class: C Discharge: 0.71 cfs Permissible Velocity: 4.50 fps Allowable Depth: 1.00 ft Swale sizing method done by manipulation of Manning's Equation to find the depth of flow that matches the known flow conditions. Performed by trial and error. INPUT DATA Qp = 0.71 cfs flow by Rational Method n= 0.191 Grass Manning's Coefficient (dimensionless) S= 0.103 ft/ft longitudinal slope (ft of fall per ft of run) Zreq = 0.29 quantity to equate to Zav M= 3 :1 side slope of channel ft of run : 1 ft of rise NORMAL DEPTH AND VELOCITY B D A P R Zav Remark 0.35 0.37 2.21 0.17 0.11 shallow 0.40 0.48 2.53 0.19 0.16 shallow 0.45 0.61 2.85 0.21 0.22 shallow 0.50 0.75 3.16 0.24 0.29 OK B = bottom width of trapezoidal channel D = normal depth of flow Zav -req A = cross-sectional area of flow V3 Qn _ A R P = wetted perimeter of the channel - 1.49 R = hydraulic radius of the channel Normal Depth, D = 0.50 ft Depth O.K. Velocity= 0.95 fps Vel. O.K. SHEAR STRESS T = yds = shear stress in Ib/sq-ft Y = unit weight of water, 62.4 lb/cu-ft D = normal depth of flow in ft S = longitudinal slope in ft/ft shear stress, T = 3.21 Ib/s -ft FINAL CHANNEL LINING DIMENSIONS B= ft side slopes, M = 3 :1 D= 1.0 ft top width, W = 6.0 ft Permanent Channel Lining: Grass (REF: Malcom. 1991) Page 1 DATE 3/03/09 PROJECT NAME PROJECT NO Wake Count Continuum of Care 08-106 DESIGN PHASE SD DD CD REV OTHER (SPECIFY) LOCATION BY Raleigh, NC RBT L CHECKED BY IJPK Channel No: Sta from: Sta to: Section Length: Section Slope: Lining Type: Permissible Shear: Channel Depth: CHANNEL-1 155 ft 10.30 % Curled Wood Mat 2.00 Ib/sf 1.00 ft Drainage Area: Design Fequency: Time of Conc: Intensity: Runoff Coeff: Discharge: Swale sizing method done by manipulation of Manning's Equation to find the depth of flow that matches the known flow conditions. Performed by trial and error. 0.21 ac 2 yrs 5 min 5.80 in/hr 0.47 0.57 cfs Qp = 0.57 cfs flow by Rational Method n = 0.036 Manning's Coefficient (dimensionless) S = 0.103 ft/ft longitudinal slope (ft of fall per ft of run) Zreq = 0.043 quantity to equate to Zav M= 3 :1 side slope of channel (ft of run • 1 ft of rise) NORMAL DEPTH AND VELOCITY B D A P R Zav Remark 0.20 0.12 1.26 0.09 0.025 shallow 0.22 0.15 1.39 0.10 0.032 shallow 0.23 0.16 1.45 0.11 0.036 shallow 0.25 0.19 1.58 0.12 0.045 OK B = bottom width of trapezoidal channel D = normal depth of flow _ A = cross-sectional area of flow Zav - Zreq P = wetted perimeter of the channel R20 Qn R = hydraulic radius of the channel 1,49 Vs Normal Depth, D = 0.25 ft Velocity= 3.05 fos T = yds = shear stress in Ib/sq-ft Y = unit weight of water, 62.4 lb/cu-ft D = normal depth of flow in ft S = longitudinal slope in ft/ft shear stress, T = 1.61 Ib/s -ft Temp Liner O.K. FINAL CHANNEL LINING DIMENSIONS B = ft side slopes, M = 3 :1 D= 1 ft top width, W= 6.0 ft Line Channel with: Curled Wood Mat (REF: Malcom, 1991) Page 2