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Home My WebLink About20220906_ESC_CalcsDocuSign Envelope ID: 1774F976-B2F9-4A65-8234-233B27BAEC48 %0 WithersRavenel lipOur People. Your Success. Erosion & Sedimentation Control Calculations Hanson Rocky Mount II Quarry RECEIVED SEP 0 6 ton LAND QUALITY MINING PROGRAM September 1, 2022 Prepared by: David Glenn, El Checked by: Daryl Riggins, PE NEAR 027404 apy�• T..�`GG DocuSign Envelope ID: 1774F976-82F9-4A65-8234-233B27BAEC48 Skimmer Sediment Basin Design Calculations Per NC Erosion & Sediment Control Planning & Design Manual Project: Hanson RM Concrete Plant Project #: 09211082 By: Daryl Riggins, PE Date: 9/1/2022 Revisions: 10 WithersRavenel Our Peopte. Your Success. TEMPORARY BASIN DESIGN SUMMARY 115 MacKenan Drive I Cary, NC 27511 t: 919.469.3340 1 f: 919.467.6008 www.withersravenel.com I License No. F-1479 DRAINAGE DISTURBED C PEAK WEIR VOLUME VOLUME SURFACE SURFACE BASIN TYPE DEPTH LENGTH WIDTH AREA AREA AREA AREA VALUE FLOW LENGTH REQUIRED PROVIDED REQUIRED PROVIDED (AC) (AC) (CFS) (FT) ( (FT) (CF) (CF) ((SF) (SF) TST 1 SED. TRAP 2.20 2.20 0.60 9.48 1 4.0 SEE EC PLANS 10 7,920 8,356 4,123 4,185 NOTES: V OF FREEBOARD PROVIDED SURFACE AREA REQUIREMENT FOR SKIMMER SEDIMENT BASIN: 435 sf/cfs SURFACE AREA REQUIREMENT FOR A SEDIMENT TRAP: 435 sf/cfs VOLUME REQUIREMENT FOR TEMPORARY SEDIMENT TRAP: 3600 cf/ac RAINFALL INTENSITY: 7.18 in/hr DocuSign Envelope ID: 1774F976-B2F9-4A65-8234-233B27BAEC48 Skimmer Sediment Basin Design Calculations Per NC Erosion & Sediment Control Planning & Design Manual 1%WithersRavenet Our People, Your Success Project: Hanson RM Concrete Plant Project #: 09211082 115 MacKenan Drive I Gary, NC 27511 By: Daryl Riggins, PE C 919.469,33401 f: 919.467.6008 Date: 9/1/2022 www.wRhersravenel corn I License No. F-1479 Revisions: Asheville I Cary I Charlotte I Greensboro I Pittsboro I Raleigh I Southern Pines I Wilmington Ralnfall Runoff Intensity 10- ear 7.18 (in/hr) Drainage Area = 2.2 AC Disturbed Area = 2.2 AC Total = I 2.20 I 1.32 Use Composite C= 0.60 Q= CIA Q30 - 9A8 CFS Surface Area Required = 4,122.76 SF 435 sf/cfs Volume Required = 7,920.00 CF 3600 cf/ac BASIN ELEVATION -AREA CALCULATION (elev & areas taken from CAD file) Contour Elevation Contour Area Average Volume Cumulative Volume (SF) (CF) (CF) 69.5 2,500.00 0.00 0.00 72 4,185.00 8,356.25 8,356.25 72 0.00 0.00 8,356.25 72 0.00 0.00 8,356.25 72 0.00 0.00 8,356.25 Surface Area Provided = 4,185.00 SF Volume Provided = 8,356.25 CF Baffle Zone Area - 1,046.25 SF DEPTH OF BASIN = 4.00 FT BASIN MINIMUM ELEVATIONS BOTTOM = 69.50 TOP SED STORAGE = 71.87 SPILLWAY = 72.37 TOPEMBANKMENT= 73.87 SPILLWAY DIMENSIONS WEIR LENGTH = 10.00 DEPTH OF FLOW = 0.50 SPILLWAY CAPACITY = 10.92( DocuSign Envelope ID: 1774F976-B2F9-4A65.8234-233B27BAEC48 Velocity Dissiaator Design Calculations Per NC Erosion & Sediment Control Planning & Design Manual Project: Hanson RM Concrete Plant ' 1% WithersRavenel Our People. Your Success. Project #: 09211082 115 MacKenan Drive I Cary, NC 27511 By: Daryl Riggins, PE t: 919.469.3340 1f: 919A67.6008 Date: 9/1/2022 www.withersravenel.com I License No. F-1479 Revisions: Asheville I Cary I Charlotte I Greensboro I Pittsboro I Raleigh I Southern Pines I Wilmington VELOCITY DISSIPATOR DESIGN SUMMARY PIPE a LENGTH WIDTH WIDTH STONE MIN. OUTLET Q25 SLOPE VELOCITY ZONE TYPE Do La 1 2 CLASS DEPTH (IN) (CFS) I (%) I (FPS) (Figure 8.06c) (Figure 806d) (FT) (FT) (F0 (IN) DW PIPE 1 18 10.6 1 0.50 1 12.96 3 OVERLAND 6 4.5 7.5 1 1 24 NOTES 1. All dissipators shall have filter fabric underliners; NCDOT Standard Specification Section 1056, or approved equivalent 2.Outlet and downstream widths shall be installed as shown in chart unless discharging into a channel, where the riprap shall be placed from top of bank to top of bank. 3. Design based on Section 8.06, Design of Riprap Outlet Protection, from the NC Erosion & Sediment Control Planning & Design Manual. 4. Q25 calculated by the Rational Method with a runoff coefficient (C) of 0.60 and a drainage area of lapproximately 2.2 acres. DocuSign Envelope ID: 1774F976•B2F94A65-8234-233B27BAEC48 Velocity Dissinator Desien Calculations Per NC Erosion & Sediment Control Planning & Design Manual Project: Hanson RM Concrete Plant Project #: 09211082 By: Daryl Riggins, PE Date: 9/1/2022 Revisions:, USE VELOCITY AND PIPE DIAMETER TO SELECT ZONE Figure 8.06e 1% WithersRavenel Our People. Your Success. 115 MacKenan Drive I Cary, NC 27511 t: 919.469.33401 f: 919.467.6008 Www.withersravenel.com I License No. F-1479 Asheville I Cary I Charlotte I Greensboro I Pittsbwo 1 Raleieh I Southern Pines I Wilmington ID15 20 25' DIAMETER (Ft.) RIPRAP SPECIFICATIONS ZONE APRON MATERIAL STONE DIAMETER (in) APRON LENGTH (x Do)' MIN. DEPTH i1n) CLASS CHANNEL I OVERLAND CHANNEL OVERLAND 1 Stone Filling (Fine) 3' 4 3 9 12 A 2 Stone Filling (Light) 6- 6 3 12 18 B 3 Stone Filling (Medium) 13' 8 4 18 24 1 4 Stone Filling (Heavy) 23' 8 4 30 36 1 5 Stone Filling (Heavy) 23' 10 5 30 36 2 6 Stone Filling (Heavy) 23' 10 6 30 36 2 7 Special Study Required (Energy Dissipatom, Stilling Basins, or Larger Size Stone STUDY STUDY STUDY STUDY STUDY 'MULTIPLY BY ORIFICE DIAMETER z N APRON MATERIAL LENGTH OF APRON TO PROTECT CULVERT Lt TO PREVENT SCOUR HOLE USE L2 ALWAYS � I STONE FILLING (FINE) CL A 3 X D, 4 x D 2 STONE FILLING (LIGHT) CL. B 3 X D, 6 x D. 3 STONE FILLING (MEDIUM) CL 1 4 X Do 8 x D 4 STONE FILLING (HEAVY) CL. 1 4 X Do 0 x D 5 STONE FILLING (HEAVY) CL.2 5XD, IOx D, 6 STONE FILLING (HEAVY) CL. 2 6 X D. 10 x D. 7 SPECIAL STUDY REQUIRED (ENERGY DISSIPATORS. STILLING BASIN OR LARGER SIZE STONE). Figure 8.06d AIM. i 1m," Pllw di+ lmin t "gum twoo W1 3 a W� Outlet "IG Do • La pipe 1 diameter (Do) LA — i w r < 0.5% LI - Overland WI= 311 o T Outlet W Do + 0.41.a pipe i diameter (I La 5Do L2 - Channel DocuSign Envelope ID: 1774F976-B2F94A65-8234-233B27BAEC48 precipitation Frequency Data Server NOAA Atlas 14, Volume 2, Version 3 Location name: Rocky Mount, North Carolina, ,�11 USA` rwen III A Latitude: 35.9782°, Longitude:-77.7395° Elevation: 74.64 fC° a 'source: ESRI Maps. "source: USGS POINT PRECIPITATION FREQUENCY ESTIMATES G.M. Bonin, D. Martin, B. Lin, T Parzybak M.Yelds. and D. May NOAA, National Weather Service, SINer Spring, Maryland PF tabulaI PF graphical I Maps & aerials PF tabular PDS-based point precipitation frequency estimates with 90% confidence Intervals (in Inches/hour), Average recurrence Interval (years) Duration 1 ��[ 2 5 10 25 50 1 50 100 200 500 1000 Strtin 4.86 4AD5.39 SW 5.06-6.13 6.23 5.658.85 7.18 6.50-7.90 8.05 27-0.88 8.87 97-9.76 9.5B 8.56-10.5 10.3 9.11.11.3 11.0 9.71-12.1 11.8 10.3-13.1 10-min 3.51A830 4.0,54.90 4.525.48 5.20-8.32 5.80-7.06 6.3& .76 6.805.38 22-8.94) .67-8.61 (8.11-310.3 15inin 2.933.58 3.40+1.10 9.82�062 4.39-5.33 4.90-5.98 5.364.56 6,73-7.04 6.07�52 6.4,".08 (6. 85.60 30-min 2.01--2.46) 2.34.2.84 2.7132E 3:8-3.88 3,63-4.42 4.D4-4.94 4.395.40 4.725.88 5.2-6AI 5A9596 1.36 1.62 1.91 2.28 2.88 3.04 3.36 3.73 4.17 4.60 60•min 125-1.53 1.47-1.78 1.742.17 2.07-2.51 2.41-2.94 2.733.34 3.023.72 3.314.11 3.684.80 4.015.08 2-hr (0.726-0898 0.857-1.04 1.02-t1.25 1.4-31852 1.47-1..81) 1.702.10 1.912637 (2.142.67) 1(2.433.07 2.713.46 1F-066 3•hr 0.5070-0.83 0.604-0944 0.725-0.895 0.883-1'OB 1.08-18.31 723-19.63 7.40.r7�.75 1.58-10.89 1.81-2.31 2.042.85 0.340 OA00 0.481 0.07 0.711 0.836 0.960 1.10 128 1A7 6-hr 0.305-0.381 0.382-0.444 0.434-0.633 0.529-0.650 0.637-0.785 0.7"-0.921 0.848-1.08 0.958-120 1.11-1.41 1.25-1.62 12-hr 0.179-0.220 0.2�2-0.257 0255-0.10 0.013-0.381 0.379-0.482 0.44&0.546 0.510-0.631 0.579-0.725 0.673-0854 0.6&0.990 4alr 0.109-01 0.132-02164 0.170-0.199 0.203-0238 0252-02B8 0.293-0.351 0.3394AI2 0.389-0.481 0464-0597 0. 27-0.688 0.082 0.105 0.125 0.155 0.181 0.211 0.244 0294 0.338 2-d7ay0.068 2 day 0.063-0.074 0.076-0.089 0.097-0.114 0.115-0.136 0.142-0.169 0.164-0.198 0.189-0.231 0.215-0.268 02-9".326 0.287-0.378 004 0.058 0.074 0.088 0.108 0.126 0.145 0.167 0200 0.28 3�ay .8 0.045-0.052 0.054-0.063 0.069-0.080 0.081-0.095 0.098-0.11 0.114-0.137 0.130-0.158 0.148-0.183 0.174-0.221 0.1954.254 OW0.059 0.069 0.085 0.098 0.112 0.129 0.152 0.173 F4.7day0.038 4�ay 0.036-0.042) 0.043-0.050) (0.054-0.063)1(0.064-0.075) (0.078-0.091)1(0.089-0.106) 0.101-0.122 0.114-0.140 0.133-0.188 0.149-0.192 026 0031 0039 0.0 0055 0063 00 0.081 0.106009 7deya . . . . . 0.024-0.028) 0.0290033)!(0.0-0 0.042-0.049 0.051-0.059 (0.058-0.068) 0.065-0.078 0.073-0.088 (0.084-0.104) 1(0.003-0.117 .. 10-dey 0.01M.022 0.023-0026)! 0.029-0033 0.D33-0.038 0099-0.046 0.044-0.052 0.050-0.058 0055-0 O88 0063-0.0 0.070-0.087 0.017 0.020 0.023 0.027 0.031 0.034 0.038 0.044 0.048 20j0.014 0.013-0.015 0.016.0.018 0.019-0.022 (0.022-0.025) 0.025-0.02B 0.028-0.033 0.032-0.09 0.035-0.041) (0.039-0.04 0.043-0.052 0.071 O 014 0.018 0.019 0.022 0.024 0.026 0.029 0.032 0.035 30 0.011-0.012 0.013-0.014 0.015-0.01 0.017.0.020 0.020-0.023 (0.022-0.025) 0.024-0.028 0.027-0.031 0.030-0.035 (0.032-0.038 0010 015 017 018-0.020 45dey 0.D09-0O10 0.0011-0.012 00113-0014 0.0014-0018 0.0016-0018 O. 0020-0.023 0021-U.025) (0024-0028) 1(0.025-0.030 0.009 0.010 0.012 0.013 0.015 0.017 0.018 0.019 0.021 0.023 60day 0.008-0.009 0.010-0.011 0.011-0.013 0.013-0.014 0.014-0.Of6) 0.016-0.017 0.017-0.019 0.01&0.021 0.020-0.023 0.021_0024 Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PD.S). mbers In parenthesis are PF estimates al lower and upper bounds of the 90% confidence Interval. The probability that precipitation frequency estimates (far aan [NI duration end average recurrence interval) will be greater than the upper bound (or less then the lower bound) la 5%. Estimates at upper bounds are notecked against probable m Amum precipitation (PMP) estimates and may be higher than currently valid PMP values. ease refer to NDAA Atlas 14 document for more Information. Back to Top PF graphical httpsJlhdsc.nws.noaa.govfhdsdpfdalpfds_printpage.html7lat=35.976281on=77.7395&data=Intensity&units=english&series=pds 114 DocuSig4Envelope ID: 1774F976-B2F94A65-8234-233B276AEO48 precipitation Frequency Date Server PDS-based intensity -duration -frequency (IDF) curves Latitude: 35.97620, Longitude:-77.7395° 300.000 10.000...:.._.:.... :.. :. .:... ... ..:... .. L C ....... ........... a y c y 0.100 .......i.....i _ i....i..i.....i_._....:.: . a� S a \� 0.030....: ...:.....:.....:.....:...:.... .. .. 0.001 C C G C G r- T TT Lh T T T T TT E E rLS V y v v v p v vp v vp .Av N VE ppE rn ppE 10 ~ N N !%f n N G N O rD .4 Duration 1+1 100.r`^^ 19 NOAA Atlas 14, Volume 2. Version 3 Average recurrence interval (years) Created (GMT): Fri Jun 10 15:42:16 2022 Back to Top Maps & aerials Small scale terrain Average recur interval (years) — 1 2 —5 — +o — 25 60 100 — 200 Soo — 1000 Duration — - 5-min — 2-day — 10-n n — 3-day 15-min — 4-day — 30 In — 7-day — 60-rnin — 10-dey — 2-hr — 204ay — 3-hr — 30-day — 6-ht — 45-day — 12-hr — 60-0ay — 24-hr https:ghdsc.nws.noaa.govlhdsctp(dslpfds_tdntpage.html7lat--35.9762&Ion=-77.7395&data=intensity&units=english&seriw=pds 214 DocuSign Envelope ID: 1774F976-B2F9-4A65-8234-233B27BAEC48 e!' �L . Roanoke Precipitation Frequency Data Server e 3km 2 _ 2mi Large scale terrain 4 @9 C 0 ~ • Durham lodry Mourt'. ibor0 Raleigh",:, O L I N A •Greenville _. + Or J PJIr 1OW" �� Jacksonville Large scale map Norfolk virginit c Beach cunt reenville 100km somi fiJacksmville , Large scale aerial httpsJlhdsc.nws.noaa.govl dselpfdslpfds,_pdntpage.html71at=35.97628Ion=77.7395&data=intercity&units=engiish&sedes=pds 3l4 DocuSign Envelope ID: 1774F976-82F9-4A65-8234-233B27BAEC48 precipita0on Frequency Data Server Back to Top US Department of Commerce National Oceanic and Atmosohedc Administration National Weather Service National Water Center 1325 Fast West Highway Silver Spring, MD 20910 Questions]: HaaQ.Qugktonl@noa-y-.gov Disclaimer httpsJlhdsc.nws.noaa.govlhdsetpfdslpfdsydntpage.html71at=35.976281on=77.73958data=lntenslty&units=english&series=pds 414