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HomeMy WebLinkAboutWPO202300018 Calculations 2023-03-17TMP#71-37K COMPLIANCE PLAN VSMP STORMWATER MANAGEMENT CALCULATIONS PACKET Date of Calculations March 16, 2023 COLLINS ENGINEERING 200 GARRETT STREET, SUITE K CHARLOTTESVILLE, VA 22902 434.293.3719 PH 434.293.2813 FX www.collins-engineering.com SCS TR-55 Calculations 1 Soils Mapping (Source: NRCS Web Soil Survey Online Database) Soils Table (Source: NRCS Web Soil Survey Online Database) E JJbi mrlf{wnly, Vlrglnl• tVA063) Albernarie County, Y9rpioia (VAd43) 4 Mw iJwIL flap URtt K1 9Www R�rS�nL of AOI 5 E ashe laamr 25 to 17-7% 95 percent slope$ MB H rriltp loam. 39-0% 2 #o 7 perceok slapes 3703 HayeswiftCIay 42-5% loam. 15 t* 25 percent slopes, severely eroded TotaIS Ipr At*a C4 too-ob t me rest Note: The soils' properties witin this development are predominantly composed of hydrologic group type B soils. Precipitation Data (Source: NOAA's National Weather Service, Hydrometerorological Design Studies Center, Atlas 14 Point Precipitation Frequency Estimates) POINT PRECIPITATION FREQUENCY (PF) ESTIMATES WITH 90% CONFIDENCE INTERVALS AND SUPPLEMENTARY INFORMATION NOAA Atlas 14, Volume 2, Version 3 II PDS-based precipitation freauencv estimates with 90% confidence intervals (in inches)' II I 24h 706 I 3.70 II 4.71 II 556 II 680 II 7.86 II 901 II 10.3 I iii I 139 I (2.7&3.42) (3.3" 11) (42M.27) (4.%6.21) (6A TW) (6.938]5) [/.88-19.9) (8.91-11.5) (10*13.6) TR 55 Worksheet 2: Runoff Curve Number and Runoff Project: TMP#71-97K Compliance VSMP Plan Designed By: LMW, PE Date: 3/16/2023 Location: 163 Patterson Mill Lane Checked By: SRC, PE Date: 3/16/2023 Check One: Present X Developed 1. Runoff curve Number (CN) Drainage Area Soil name and hydrologic Cover description Product of CN x CN (weighted) _Area Calculated'S' (Cover type, treatment, and hydrologic condition; percent CN total product/ Description group (Appendix A) impervious; unconnected/ connected impervious area ratio) (Acres) Area total area Value Impervious Areas(Existing Building) 98 0.13 12.7 DAA B Lawns in Good Condition (25%+/-) 61 0.10 6.1 84 1.87 (Pre-ReDev.) Gravel (Parking Area) 85 0.69 58.7 Impervious Areas(Existing Building) 98 0.13 12.7 DAA B Lawns in Good Condition (25%+/-) 61 0.19 11.6 82 2.21 (Post-ReDev) Gravel (Parking Area) 1 85 1 0.60 1 51.0 2. Runoff 1-Year Storm 2-Year Storm 30-Year Storm 100-Year Storm I Drainage Area Description Frequency -years 1 2 10 100 n/a Rainfall, P(24 hour) -inches 3.06 3.7 5.56 9.03 n/a Runoff, Q-inches 1.58 2.13 1 3.81 1 7.12 DAA(Pre-ReDev) Runoff, Q-inches 1.42 1.94 1 3.57 1 6.83 1 DA A(Post-ReDev) U.S. Department of Agriculture Natural Resources Conservation Service TR 55 Worksheet 3: Time of Concentration (TJ or Travel Time (Tt) Project: TMP#71-97K Compliance VSMP Plan Designed By: Location: 163 Patterson Mill Lane Checked By: Check One: Present % Developed % Check One: Tc % Tt DAA DAA (Pre-ReDev.) (Post-ReDev) Segment ID: Sheet Flow: (Applicable to Tc only) 1 Surface description (Table 3-1) 2 Manning's roughness coeff., in (Table 3-1) 3 Flow length, L (total L < 100) (ft) 4 Two-year 24-hour rainfall, P,(in.) 5 Land slope, s (ft/ft) 6 Compute Tt= [0.007(n*L)"I / Pis s" Smooth Smooth Surface Surface 0.011 0.011 100 100 3.70 3.70 0.04 0.04 0.01 0.01 Shallow Concentrated Flow: 7 Surface description (paved or unpaved) Paved Paved 8 Flow Length, L (ft) 90 32 9 Watercourse slope, s (ft/ft) 0.04 0.03 10 Average velocity, V (Figure 3-1) (ft/s) 4.0 3.5 11 Tt= L/ 3600*V 0.01 0.00 Shallow Concentrated Flow: 7 Surface description (paved or unpaved) Unpaved Unpaved 8 Flow Length, L (ft) 72 130 9 Watercourse slope, s (ft/ft) 0.11 0.08 10 Average velocity, V (Figure 3-1) (ft/s) 7.0 4.6 SS Tt=L/3600*V 0.00 0.01 Channel Flow: 12 Cross sectional flow area, a (ft) 13 Wetted perimeter, P. (ft) 14 Hydraulic radius, r = a/Pw (ft) 15 Channel Slope, s (ft/ft) 16 Manning's Roughness Coeff, n 17 V= [ 1.49r�'S" ] / n 18 Flow length, L (ft) 19 Tt= L / 3600*V 20 Watershed or subarea Tc or Tt (Add Tt in steps 6, 11 and 19) 796 0.10 0.10 n/a FL-ENG-21A 06/04 Date: 3/16/2023 Date: 3/16/2023 Location: 163 Patterson Mill Lane Checked By: SRC, PE Date: 3/16/2023 Check One: Presen% Dew% 1. Data Drainage Area Description Drainage Area Description DA A (Pre-ReDev.) DA A (Post-ReDev) Drainage Area (Am) in miles' 0.0014 0.0014 Runoff curve number CN= 84 82 Time of concentration (Tc)= 0.10 0.10 Rainfall distribution type= Type II Type II Pond and swamp areas spread throughout the watershed= 0 0 2. Frequency -years 1 2 10 100 1 2 10 100 3. Rainfall, P (24 hour)- inches 3.06 3.7 5.56 9.03 3.06 3.7 5.56 9.03 4. Initial Abstraction, la- inches 0.37 0.37 0.37 0.37 0.44 0.44 0.44 0.44 5. Compute la/P 0.12 0.10 0.07 0.04 0.14 0.12 0.08 0.05 6. Unit peak discharge, Qu-um/in See Hydrograph for Flows Routed through Detention Basin 7. Runoff, Q from Worksheet 2-inches 1.58 2.13 3.81 7.12 1.42 1.94 3.57 6.83 8. Pond and Swamp adjustment factor, Fp 1 1 1 1 1 1 1 1 9. Peak Discharge, Qp- cfs where Qp=Qu Am Q Fp 2.23 2.99 5.30 9.62 2.02 2.77 5.05 1 9.38 WATERSHED SUMMARY FOR CHANNEL AND FLOOD PROTECTION Area, 1-year Flow, 2-year Flow, 10-year Flow, 100-year Flow, CN ac. cfs cfs cfs cfs DAA(Pre-ReDev) 84 0.92 2.23 2.99 5.30 9.62 DAA(Post-ReDev) 82 0.92 2.02 2.77 5.05 9.38 Pre-ReDevelopment Site Flow Hydrographs The following inflow hydrographs reflect the pre -redevelopment onsite concentrated flow from Subarea A. Worksheet 5b (Modified for Clarity): Basic watershed Data 1-yr. 24-hr. SCS TR-55 Method Unit Hydrograph for the la/P & Tc Listed Below Subarea Tc (hrs.) Tt (hr.) la / P Am'Q (miz-in) DA A 0.10 0.10 0.12 0.0023 (Pre-ReDev.) Hydrograph Time (hrs.) 1-yr Discharges (cfs) 0.0 0.00 11.0 0.05 11.3 0.07 11.6 0.11 11.9 0.72 12.0 1.45 12.1 2.28 12.2 1.39 12.3 0.49 12.4 0.34 12.5 0.29 12.6 0.24 12.7 0.20 12.8 0.18 13.0 0.15 13.2 0.13 13.4 0.12 13.6 0.11 13.8 0.10 14.0 0.09 14.3 0.08 14.6 0.08 15.0 0.07 15.5 0.06 16.0 0.05 16.5 0.05 17.0 0.05 17.5 0.05 18.0 0.04 19.0 0.04 20.0 0.03 22.0 0.03 26.0 0.00 SCS TR-55 Pre-ReDevelopment Unit Hydrograph (ON DA A) Worksheet 5b (Modified for Clarity): Basic watershed Data 2-yr. 24-hr. SCS TR-55 Method Unit Hydrograph for the la/P & Tc Listed Below Subarea Tc (hrs.) Tt (hr.) la / P Am'Q (miz-in) DA A 0.10 0.10 0.10 0.0031 Hydrograph Time (hrs.) 2-yr Discharges 0.0 0.00 11.0 0.07 11.3 0.10 11.6 0.16 11.9 1.02 12.0 1.98 12.1 3.09 12.2 1.91 12.3 0.66 12.4 0.45 12.5 0.38 12.6 0.32 12.7 0.26 12.8 0.23 13.0 0.20 13.2 0.17 13.4 0.16 13.6 0.14 13.8 0.13 14.0 0.12 14.3 0.10 14.6 0.10 15.0 0.09 15.5 0.08 16.0 0.07 16.5 0.06 17.0 0.06 17.5 0.06 18.0 0.06 19.0 0.05 20.0 0.04 22.0 0.04 26.0 0.00 6 SCS TR-55 Pre-ReDevelopment Unit Hydrograph (ON DA A) Worksheet 5b (Modified for Clarity): Basic watershed Data 10-yr. 24-hr. SCS TR-55 Method Unit Hydrograph for the la/P & Tc Listed Below Subarea Tc (hrs.) Tt (hr.) la / P Am'Q (miz-in) DA A 0.10 0.10 0.07 0.0055 (Pre-ReDev.) Hydrograph Time (hrs.) 10-yr Discharges (cfs) 0.0 0.00 11.0 0.13 11.3 0.19 11.6 0.29 11.9 1.83 12.0 3.54 12.1 5.53 12.2 3.41 12.3 1.19 12.4 0.81 12.5 0.67 12.6 0.57 12.7 0.47 12.8 0.42 13.0 0.36 13.2 0.31 13.4 0.28 13.6 0.25 13.8 0.23 14.0 0.21 14.3 0.19 14.6 0.18 15.0 0.16 15.5 0.14 16.0 0.13 16.5 0.12 17.0 0.11 17.5 0.10 18.0 0.10 19.0 0.08 20.0 0.07 22.0 0.07 26.0 0.00 6 s a 3 2 1 0 SCS TR-55 Pre-ReDevelopment Unit Hydrograph (ON DA A) Worksheet 5b (Modified for Clarity): Basic watershed Data 100-yr. 24-hr. SCS TR-55 Method Unit Hydrograph for the la/P & Tc Listed Below Subarea Tc (hrs.) Tt (hr.) la / P Am'Q (miz-in) DA A 0.10 0.10 0.04 0.0102 (Pre-ReDev.) Hydrograph Time (hrs.) 100-yr Discharges (cfs) 0.0 0.00 11.0 0.25 11.3 0.35 11.6 0.54 11.9 3.42 12.0 6.62 12.1 10.33 12.2 6.37 12.3 2.22 12.4 1.50 12.5 1.26 12.6 1.06 12.7 0.88 12.8 0.78 13.0 0.68 13.2 0.58 13.4 0.52 13.6 0.47 13.8 0.43 14.0 0.39 14.3 0.35 14.6 0.33 15.0 0.30 15.5 0.27 16.0 0.24 16.5 0.21 17.0 0.20 17.5 0.19 18.0 0.18 19.0 0.15 20.0 0.13 22.0 0.12 26.0 0.00 6 5 4 3 2 1 0 SCS TR-55 Pre-ReDevelopment Unit Hydrograph (ON DA A) Channel and Flood Protection Calculations The following calculations shows how Subarea A meets Channel and Flood Protection requirements. 9 VAC 25-870-66 Section B: Channel Protection Utilizing a 6-inch Orifice "Concentrated stormwater flow shall be released into a stormwater conveyance system and shall meet the criteria in subdivision 1, 2 or 3 of this subsection..." Section B.1: Manmade stormwater conveyance systems "When stormwater from a development is discharged to a manmade stormwater conveyance system, following the land -disturbing activity, either..." a. or b. shall be met: Section B.l.b. "The peak discharge requirements for concentrated stormwater flow to natural stormwater conveyance systems in subdivision 3 of this subsection shall be met." Section 8.3 "... the maximum peak flow rate from the one-year 24-hour storm following the land -disturbing activity shall be calculated either.." a. or b." Section 6.3.a. In accordance with the following methodology: Q Allowed < I.F. * (Q Pre -Developed * [RV Pre -Developed] ) I (RV Developed ) Q Allowed Where: QPre-Developed= CN Pre -Developed= S Pre -Developed = RV Pre -Developed — CN Post -Developed= S Post -Developed = RV Port -Developed= I.F. _ Q Developed < 2.24 cfs 2.23 cfs (From TR-55) 84 (From Curve Number Summary) 1.87 (From SCS TR-55 eq. 2-4) 1.58 in. (From SCS TR-55 eq. 2-3) 82 (From Curve Number Summary) 2.21 (From SCS TR-55 eq. 2-4) 1.42 in. (From SCS TR-55 eq. 2-3) 0.90 (Factor of Safety) = 2.02 cfs Section B.4 Limits of Analysis The analysis terminates at Post-ReDevelopment Subarea A since subsection B.3.a is met. 9 VAC 25-870-66 Section C: Flood Protection "Concentrated stormwater flow shall be released into a stormwater conveyance system and shall meet one of the following criteria as demonstrated by use of acceptable hydrologic and hydraulic methodologies:" Section C.2.b.: The point of discharge (the low point of the drainage area within the soil stabilization area), "releases a postdevelopment peak flow rate for the 10-year 24-hour storm event that is less than the predevelopment peak flow rate from the 10-year 24-hour storm event. Downstream stormwater conveyance systems do not require any additional analysis to show compliance with flood protection criteria if this option is utilized." 10-Year, 24-Hour Pre-ReDevelopment Subarea A Peak Flow Rate = 5.30 cfs 10-Year, 24-Hour Post-ReDevelopment Subarea A Peak Flow Rate = 5.05 cfs Section C.3 Limits of Analysis The flood protection analysis terminates at Subarea A since subsection C.2.b is met. Post -Re Development Hydrographs The following hydrographs reflect the post -redevelopment attenuation in Subarea A from the decreased impervious area and soil stabilization. Worksheet 5b (Modified for Clarity): Basic watershed Data 1-yr. 24-hr. SCS TR-55 Method Unit Hydrograph for the la/P & Tc Listed Below Subarea Tc (hrs.) Tt (hr.) la / P Am'Q (miz-in) DA A 0.10 0.10 0.14 0.0020 (Post-ReDev) Hydrograph Time (hrs.) 1-yr Discharges (cfs) 0.0 0.00 11.0 0.04 11.3 0.06 11.6 0.09 11.9 0.61 12.0 1.29 12.1 2.03 12.2 1.23 12.3 0.44 12.4 0.31 12.5 0.26 12.6 0.22 12.7 0.18 12.8 0.16 13.0 0.14 13.2 0.12 13.4 0.11 13.6 0.10 13.8 0.09 14.0 0.08 14.3 0.08 14.6 0.07 15.0 0.06 15.5 0.06 16.0 0.05 16.5 0.05 17.0 0.04 17.5 0.04 18.0 0.04 19.0 0.03 20.0 0.03 22.0 0.03 26.0 0.00 SCS TR-55 Post-ReDevelopment Unit Hydrograph (ON DA A) Worksheet 5b (Modified for Clarity): Basic watershed Data 2-yr. 24-hr. SCS TR-55 Method Unit Hydrograph for the la/P & Tc Listed Below Subarea Tc (hrs.) Tt (hr.) la / P Am'Q (miz-in) DA A 0.10 0.10 0.12 0.0028 (Post-ReDev) Hydrograph Time (hrs.) 2-yr Discharges (cfs) 0.0 0.00 11.0 0.06 11.3 0.09 11.6 0.13 11.9 0.88 12.0 1.78 12.1 2.80 12.2 1.71 12.3 0.61 12.4 0.42 12.5 0.35 12.6 0.30 12.7 0.25 12.8 0.22 13.0 0.19 13.2 0.16 13.4 0.15 13.6 0.13 13.8 0.12 14.0 0.11 14.3 0.10 14.6 0.09 15.0 0.08 15.5 0.08 16.0 0.07 16.5 0.06 17.0 0.06 17.5 0.06 18.0 0.05 19.0 0.04 20.0 0.04 22.0 0.04 26.0 0.00 0 SCS TR-55 Post-ReDevelopment Unit Hydrograph (ON DA A) Worksheet 5b (Modified for Clarity): Basic watershed Data 10-yr. 24-hr. SCS TR-55 Method Unit Hydrograph for the la/P & Tc Listed Below Subarea Tc (hrs.) Tt (hr.) la / P Am'Q (miz-in) DA A 0.10 0.10 0.08 0.0051 (Post-ReDev) Hydrograph Time (hrs.) 10-yr Discharges (cfs) 0.0 0.00 11.0 0.12 11.3 0.17 11.6 0.27 11.9 1.72 12.0 3.32 12.1 5.19 12.2 3.20 12.3 1.11 12.4 0.75 12.5 0.63 12.6 0.53 12.7 0.44 12.8 0.39 13.0 0.34 13.2 0.29 13.4 0.26 13.6 0.24 13.8 0.22 14.0 0.20 14.3 0.17 14.6 0.16 15.0 0.15 15.5 0.13 16.0 0.12 16.5 0.11 17.0 0.10 17.5 0.10 18.0 0.09 19.0 0.08 20.0 0.07 22.0 0.06 26.0 0.00 6 5 4 3 2 z 0 SCS TR-55 Post-ReDevelopment Unit Hydrograph (ON DA A) Worksheet 5b (Modified for Clarity): Basic watershed Data 100-yr. 24-hr. SCS TR-55 Method Unit Hydrograph for the la/P & Tc Listed Below Subarea Tc (hrs.) Tt (hr.) DA A 0.10 0.10 (Post-ReDev) Hydrograph Time(hrs.) 100-yr Discharges (cfs) 0.0 0.00 11.0 0.24 11.3 0.33 11.6 0.52 11.9 3.28 12.0 6.35 12.1 9.91 12.2 6.11 12.3 2.13 12.4 1.44 12.5 1.21 12.6 1.02 12.7 0.84 12.8 0.75 13.0 0.65 13.2 0.56 13.4 0.50 13.6 0.45 13.8 0.41 14.0 0.37 14.3 0.33 14.6 0.31 15.0 0.28 15.5 0.26 16.0 0.23 16.5 0.21 17.0 0.20 17.5 0.19 18.0 0.18 19.0 0.15 20.0 0.13 22.0 0.12 26.0 0.00 la / P Am;Q (mi2-in) 0.05 0.0098 SCS TR-55 Post-ReDevelopment Unit Hydrograph (ON DA A) Virginia Runoff Reduction Method Water Quality Calculations (COMPLIANCE IS MET THROUGH THE DECREASE OF IMPERVIOUS AREA. THE VRRM BOUNDARY IS DEFINED BY THE LIMITS OF DISTURBANCE SHOWN IN THE EROSION AND SEDIMENT CONTROL PLAN) OEQ WMinia Runaf RMUu ion MCMod Re- wtopment Eumpliancespreadshma-Verslon3a 020110MIRsemdards and Sp-Musiwrc D'3....... P standards and sladfica [ pmlM Name: TMP031ATKCam Me Late: 3 /lfi/3033 dT "i No Xrear Develop ntPro MT P^m 1 bdaYen Ih Site Information ........... .. ........... Post -Development Project (Treatment Volume and Loads) .. ... ... .... Enter Total Disturbed Area (acres) e.II Chatie_ -- a.P Oesom soncificaeons list: 2013 Pak Stds L lar-Irroel? N. - .. .. 0 land rover ener? ✓ .. .. .... ... mwi damtedaaentered?✓ M IQRP RZINNOTON NOT REQualsor'. Pre-Raterelagnent W Cover (ap6( Sell[ - - ranVIXeeaNsa,. eal-a`xsmmm weWera e.eeryravpe nN lmeenam—la e) PorttOecelopment Santl Dower (aves) Sella 85eav Selh o5eh Imakman reatyyenyselaeexl-.naismmee, - ',. ',. 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Rn 0-al wagmamnsme vrapmtln.0ml1 weNn�ane0uq o.m xmeaae.ad kan.ar.n aammeTad Tax lnKeroaa[me.lwaexl 0.13 015 rvda Ceseeovaal ott.losaa��Al'a p om IN l"plecerw'eCaa _.._.._ Raa.1 rem.:l anameuwal Farmaavnna ose elan el xlmcerv���: lea 51. xemenem xsx .=s.na xex ---T°Svlaelrn'SNeee arealaaml nx3 Mlskeaealaeeal O.S3 6zs due 0.4a Wesaep nW Trwlmenl Volume and Nldrlent Load Treatment Volume and Nutrleat L osd numekpmen� FINNxa-a,mennve P.-a a aaeme mlx0 a0110 reamer um 0mxm eatla.resllum T m o e nmX T—..went easm - e�al ume lam Iw�M 1 em xoneuvnenuvmentvesme akpmem r zv sx1 naaien u 33o me aain,emvom vo rrelrybi.laatl ma Twaacewm Bleak - ImtiaNry Immkuep Nal FinalemR Prr0.eMelepon" Tebatl s vu SwLarsganna, p,33 0.33 Cne Leae O31 Rmryd Um/rd lmelralm _ 0m/vtl• n 1 ae- I0p0 nawm are map-r. 1m uz Final wn-0aw wm DA ae>n/nl :v Ia0a.aoemm TP na aasm/y`em gp lmPRe/vrl Lam llb/rrl Lw anwowrm InuleslawMmrvlmwpcw.wnmemare rmi o03 re '.. laa+mne- me em por�srvreaimprvou:.«rl '.. meanm —I 'nryuatllmtl[mrvsummuy - - m ixcerc4mnaa 4mtl ntw lmm /pmygenyuza RL... R dma on 0.eea ra far A09 mLetl Meunan 0.eau retllar New 0 mw.nReamMa mmwmaratlb pMma 0.ed... mad nrm meemeasareal a/rd ngaaamwanevyeumvuan�musm�mm�aamzlnrsia wcya -.- am.Mmmmem.�,y '.. ,em.am raRweemty mw:nPwma ame, rm,atl �... d.aweme..wmenna.,lm✓ mmy Post-�eloprnent Requirement for Site Area m Load Redomoo Required (m/r) I . Site Results (Water Quality Compliance) Area Checks O.A.A O.A.B O.A.0 A. D.A.E ARMEM FOREST/OVEN SPACE (a[) am O.M 0.00 i0.00 O.W OK. IMPERVIOUS MVER I IMPERVnMCOVERTRENTFDIa[ 0.00 0.00 0.00�M. OWOK. MANAGEDMRFARENIa[) 0.00 O.00 0.00 00.W OK. MANAGED TURF AREA TREATED (a[) am O.00 0.00 0.00 OK. ABU CHECK OK OK. OK. OK. Site Treatment VOIUMe (ffa) 330 Runoff Reduction Volume and TP By Drainage Area O.A. A O.A. C D.A. D O.A. E TOTALRUNOFF REDUCNON VOLUME ACHIEVED pF) 0 0 0 00 AL Qb/yrl LOADAVAKABLE FNhh 0.00 MAI 0.00 0.00O0.00 TPIDADREDUCTIED pb/yrl 0.00 0.0000000TP LOADING (Ib/yr) 0.00 0.00 0.00 O.W am NMWGEN MD REDUCTIED pb/yr) am O.W 0.00 0.00 O.W 0.00 Totphorus FINAL POST-DEVELOPMAD Qb/yr) 0.21 IPLOADBEDUCTIRED pb/yrl -0.m TP WAD REDUCTIED pb/V) 0.00 W LOAD REMAINING Qb/N): 0.21 REMAINING TP LOAD REDUCTION REQUIRED pb/yrl: am "TARGET TP REDUUION EXCEEDED BY 0AB LB/YEAR" Total Nitrogen (For Information Purposes) POST-DEVEMPMEM WAD (Ib/yr)jj IAa NU MEN LOAD REDUCTION ACHIEVED (Ib/vr)Ij 0.00 REMAINING POST -DEVELOPMENT NRRWEN LOAD )Ib/yrl IA