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Home My WebLink AboutWPO201500004 Calculations WPO VSMP 2015-05-14 CHARLOTTESVILLE CATHOLIC SCHOOL STORMWATER MANAGEMENT CALCULATIONS PACKET • Date of Calculations FEBRUARY 25, 2015 Revised on MAY 14, 2015 PREPARED BY: COLLINS EN / NE N 200 GARRETT STREET, SUITE K CHARLOTTESVILLE,VA 22902 434.293.3719 PH 434.293.2813 FX www.collins-engineering.com SCS TR-55 Calculations Soils Mapping (Source: NRCS Web Soil Survey Online Database) . F. , it, i .,-„p. 44,, .% ".4 t,., . :' :. t.r. aY+j Y j { X •kph" �r "±'L�• " • �4 et /•.• ; y,. '`. ry''' •'•€`�U i' >a /4' � " 0 F ^ M Y om' `vq'? ^ • . ;r it f ma c' ... ,. it Soils Table (Source: NRCS Web Soil Survey Online Database) Albemarle County,Virginia`(VA003) . Map Unit.#. Map Unit Name Percent Symbol.J of AOl[ 21B Culpeper fine sandy loam,2.z 21.6% to 7,percent.slopes. r 21C ,Culpeper fine sandy loam,7 ° '28.5%.i to 15 percent slopes, 39D :Hazel loam,15 to 25 49.9%1 percent slopes° f• `Totals for Area of Interest 100.0% Note: Soils' properties witin proposed disturbances are predominantly composed of hydrologic type B soils. i U.S.Department of Agriculture FL-ENG-21A Natural Resources Conservation Service 06/04 TR 55 Worksheet 2:Runoff Curve Number and Runoff Project: Charlottesville Catholic School Designed By:FGM,PE Date: 5/14/2015 Location: 1205 Pen Park Road Checked By:FGM,PE Date: 5/14/2015 Check One: Present X Developed X 1.Runoff curve Number(CN) Drainage Area Soil name and I Cover description Area Product of CN(weighted)= Calculated hydrologic group (Cover type,treatment,and hydrologic condition;percent CN total product/ Description (Appendix A) impervious;unconnected/connected impervious area ratio) (Acres) CN x Area total area S'Value DA A Impervious Areas 98 0.65 63.7 (Pre-ReDev) B Woods in Good Condition 55 0.00 0.0 69.3 4.42 Lawns in Good Condition(75%+Groundcover) 61 2.23 136.0 DA A Quality Impervious Areas 98 0.79 77.3 (Post-ReDev) B Woods in Good Condition 55 0.00 0.0 73.2 3.67 Lawns in Good Condition(75%+Groundcover) 61 1.61 98.3 DA A Quantity Impervious Areas 98 0.79 77.3 (Post-ReDev) B Woods in Good Condition 55 0.00 0.0 71.1 4.06 Lawns in Good Condition(75%+Groundcover) 61 2.09 127.6 2.Runoff 1-Year Storm 2-Year Storm 10-Year Storm Drainage Area Description Frequency-years 1 2 10 n/a Rainfall,P(24 hour)-inches 3.5 3.7 5.6 n/a Runoff,Q-inches 0.97 1.10 2.43 DA A(Pre-ReDev) Runoff,Q-inches 1.19 1.33 2.77 DAAQuality(Post-ReDev) Runoff,Q-inches 1.07 1.20 2.59 DA A Quam ty(Post-ReDev) • U.S.Department of Agriculture FL-ENG-21A Natural Resources Conservation Service 06/04 TR 55 Worksheet 3:Time of Concentration(T,)or Travel Time(TO Project: Charlottesville Catholic School Designed By:FGM,PE Date: 5/14/2015 Location: 1205 Pen Park Road Checked By:FGM,PE Date: 5/14/2015 Check One: Present X Developed X Check One: T, X T, Through subarea n/a DAA DAAQuality DAAQuantity Segment ID: (Pre-ReDev) (Post-ReDev) (Post-ReDev) Sheet Flow:(Applicable to T,only) (Same Tc as the upland DA 1 Surface description(Table 3-1) Dense Grass Dense Grass 'A'Quality analysis) 2 Manning's roughness coeff.,n(Table 3-1 0.24 0.24 3 Flow length,L(total L<100)(ft) 100 100 4 Two-year 24-hour rainfall,P2(in.) 3.7 3.7 5 Land slope,s(ft/ft) 0.06 0.06 6 Compute T,=[0.007(n"L)°'s]/P2 s s°'4 0.14 0.14 Shallow Concentrated Flow: 7 Surface description(paved or unpaved) Unpaved Unpaved 8 Flow Length,L(ft) 540 395 9 Watercourse slope,s(ft/ft) 0.04 0.04 10 Average velocity,V(Figure 3-1)(ft/s) 3.2 3.2 11 Tt=L/3600"V 0.05 0.03 Channel Flow: 12 Cross sectional flow area,a(ft) 13 Wetted perimeter,P,.(ft) 14 Hydraulic radius,r=a/P,.,(ft) 15 Channel Slope,s(ft/ft) 16 Manning's Roughness Coeff,n 17 V=[1.49r'/3s°'s]/n 18 Flow length,L(ft) 19 T,=L/3600"V 20 Watershed or subarea T,orT, (Add Tt in steps 6,11 and 19) 0.19 0.17 0.17 NOTE:Most conservative sCs TR-55 Method Tc=0.10 hrs. U.S.Department of Agriculture FL-ENG-21C Natural Resources Conservation Service 06/04 TR 55 Worksheet 4:Graphical Peak Discharge Method Project: Charlottesville Catholic School Designed By: FGM,PE Date: 5/14/2015 Location: 1205 Pen Park Road Checked By: FGM,PE Date: 5/14/2015 Check One: Present X Developed X Drainage Area Drainage Area Drainage Area Drainage Drainage Drainage Drainage Drainage Area 1.Data Description Description Description Area Area Area Area Description DAA DAA Quality DAA Quantity (Pre-ReDev) (Post-ReDev) (Post-ReDev) , Drainage Area(Am)in miles '= 0.0045 0.0038 0.0045 Runoff curve number CN= 69.3 73.2 71.1 Time of concentration(Tc)= 0.19 0.17 0.17 Rainfall distribution type= II II II - Pond and swamp areas spread 0 0 0 throughout the watershed= 2.Frequency-years 1 2 10 1 2 10 1 2 10 3.Rainfall,P(24 hour)-inches 3.5 3.7 5.6 3.5 3.7 5.6 3.5 3.7 5.6 4.Initial Abstraction,la-inches 0.884 0.884 0.884 0.734 0.734 0.734 0.812 0.812 0.812 5.Compute la/P 0.25 0.24 0.16 _ 0.21 0.20 0.13 0.23 0.22 0.14 6.Unit peak discharge,Qu-csm/in 750 775 800 800 800 825 800 800 825 - 7.Runoff,Q from Worksheet 2-inches 0.97 1.10 2.43 1.19 1.33 2.77 1.07 1.20 2.59 8.Pond and Swamp adjustment factor,Fp 1 1 1 1 1 1 1 1 1 9.Peak Discharge,Qp-cfs Flows to Downstream Routed Through where Qp=Qu Am Q Fp 3.28 3.82 8.76 Detention Area Detention Area Post-Development Routed Flows CCS- Detention Area Quantity Control Routing BasinFlow printout INPUT: Basin: CCS- Downslope Detention Area 7 Contour Areas Elevation(ft) Area(sf) Computed vol . (cy) 409.00 185.00 0.0 410.00 493.00 12.1 412.00 1208.00 73.2 413.00 2233.00 135.9 414.00 3269.00 237.2 415.00 4624.00 382.6 416.00 6722.00 591.5 Start_Elevation(ft) 412.00 Vol . (cy) 73.15 1 Outlet Structures outlet structure 0 Weir name: emergency spillway length (ft) 20.000 side angle 75.000 coefficient 3.330 invert (ft) 414.500 multiple 1 discharge through dam 4 Inflow Hydrographs Hydrograph 0 SCS name: 1-yr 24-hr Peak SCS Method Area (acres) 2.400 CN 73.200 Type 2 rainfall , P (in) 3. 500 time of conc. (hrs) 0.1700 time increment (hrs) 0.0200 time limit (hrs) 30.000 fudge factor 1.00 routed true peak flow (cfs) 3.236 peak time (hrs) 11.961 volume (cy) 384.116 Hydrograph 1 SCS name: 2-yr 24-hr Peak SCS Method Area (acres) 2.400 CN 73.200 Type 2 rainfall , P (in) 3.700 time of conc. (hrs) 0.1700 time increment (hrs) 0.0200 time limit (hrs) 30.000 fudge factor 1.00 routed true peak flow (cfs) 3.609 peak time (hrs) 11.961 volume (cy) 428.306 Page 1 CCS- Detention Area Quantity Control Routing Hydrograph 2 SCS name: 10-yr 24-hr Peak SCS Method Area (acres) 2.400 CN 73.200 Type 2 rainfall , P (in) 5.600 time of conc. (hrs) 0.1700 time increment (hrs) 0.0200 time limit (hrs) 30.000 fudge factor 1.00 routed true peak flow (cfs) 7.546 peak time (hrs) 11.961 volume (cy) 895.610 Hydrograph 3 SCS name: 100-yr 24-hr Peak SCS Method Area (acres) 2.400 CN 73.200 Type 2 rainfall , P (in) 9.100 time of conc. (hrs) 0.1700 time increment (hrs) 0.0200 time limit (hrs) 30.000 fudge factor 1.00 true peak flowrouted(cfs) 15.810 peak time (hrs) 11.961 volume (cy) 1876.500 OUTPUT: Routing Method: storage-indication Hydrograph 0 Routing summary of Peaks: 1-yr 24-hr Peak SCS Method inflow (cfs) 3.236 at 11.96 (hrs) discharge (cfs) 0.653 at 12.14 (hrs) water level (ft) 414.546 at 12.14 (hrs) storage (cy) 310.310 Hydrograph 1 Routing Summary of Peaks: 2-yr 24-hr Peak SCS Method inflow (cfs) 3.608 at 11.96 (hrs) discharge (cfs) 1.877 at 12.08 (hrs) water level (ft) 414.592 at 12.08 (hrs) storage (cy) 317.167 Hydrograph 2 Routing Summary of Peaks: 10-yr 24-hr Peak SCS Method inflow (cfs) 7.545 at 11.96 (hrs) discharge (cfs) 7.206 at 11.98 (hrs) water level (ft) 414.722 at 11.98 (hrs) storage (cy) 337.128 Hydrograph 3 Routing Summary of Peaks: 100-yr 24-hr Peak SCS Method inflow (cfs) 15.809 at 11.96 (hrs) discharge (cfs) 15.548 at 11.98 (hrs) water level (ft) 414.866 at 11.98 (hrs) storage (cy) 360.163 Tue May 12 10:52:09 EDT 2015 Page 2 . :.> ... . .S.,* _ 0 0 5) 6 ..., . tl, -1 #4 ,t in 0 9, 0 09 4).. - l'7•' W D-} IA IN ('``• r"'\ /4 r z 9 J-1 ,:.....-, • .,-1 4E. x --/ e g ti - ......... ,........„ n, m g ...., (.^ :-:::- IX) -3 ..S" 7 • ;'''- • 6 -V 0 4......- l't .. L., iA. --dal .4 '` g.. 2 m 0 F t ° ?it Pi ft X < Z 74' rl s- V . CP 0 › I',. ,r, • -:--2( , . 1 1 I e 7.11. fiN,„ li F r 2 > ,.A fri • ),± 4. .> z 0 .T. › - Pi .s -cv\ P ' f,1:,.'x$4 P. .5 . .7r .111-: r-s•: .LA --q ,,Ts • ,k .-4 . . . . 03. c (7.-N •P n . 7,, -. . ., l'' • , . F 2 %ft fA —4 -;I V tri -i- • 'f It ' . :t trt: > : ,—, 1 c')%u • R ..-P E r-, IA . r tai -TI V ill . . 23 tt .... _r , DEQ Virginia Runoff Reduction Method Water Quality Calculations Virginia Runoff Reduction Method ReDevelopment Worksheet-v2.8-June 2014 To be used w/2011 BMP Standards and Specifications Site Data Project Name:Charlottesville Catholic School Date:5/14115 .__.._._._..., ..,_.___ I ?data input cells -„°„" - icalculation cells constant values Post-ReDevelopment Project&Land Cover Information Total Disturbed Acreage 280 Constants • Annual Rainfall(inches) - 43 Target Rainfall Event(inches) 1.00 Phosphorus EMC(mglL) 0.26 - Nitrogen EMC(mglL) 1.88 Target Phosphorus Target Load(Ib/acre/yr) 0.41 . Pj 0.90 Pre-ReDevelopment Land Cover(acres) A soils B Solis C Soils D Soils Totals Forest/Open Space(acres)-undisturbed, protected forest/open space or reforested land 0.00 ,0.00 '0.00 0.00 0.00 ' Managed Turf(acres)-disturbed,graded for , yards or other turf to be mowed/managed 0.00 ' 2.31 0.00 0.00 2.31 Impervious Cover(acres) 0.00 _ " 1.23 _ 0.00 0.00 1.29 . Total 3.60 Pont-ReDevelopment Land Cover(acres) A soils B Soils C Soils D Soils Totals Forest/Open Space(acres)-undisturbed, protected forest/open space or reforested land . . 0,00 0.00 '0.00 0.00 0.00 Managed Turf(acres)-disturbed,graded for . • yards or other turf to be mowed/managed 0.00 ' 2.16 0.00. 0.00 2.1e Impervious Cover(acres) 0.00 -1.44 0.00 0.00 1.44 'Total 3.60 ' Area Check Okay Okay Okay Okay Rv Coefficients A soils B Soils C Solis D Soils Forest/Open Space - 0.02 0.03 0.04- 0.05 Managed Turf 0.15 0,20 0.22 ' 0.25 Impervious Cover 0.95 0.95' • 0.95' ' ' . 0.95 Land Cover Summary Listed Adjusted' Land Cover Summary Land Cover Summary Pre-ReDevelopment Post-ReDevelopment Post-ReDevelopment New Impervious 'Forest/Open Space " Forest/Open Space Cover(acres) 0.00 0,00 Cover(acres) . 0.00 Composite Composite Rv(forest) 0.00-• 0.00 Rv(forest) ' 0.00 %Forest 0% 0% %Forest • 0% Managed Turf Managed Turf Cover(acres) 2.31 216' Cover(acres) .2.15 Composite Rv(turf) 0.20 0.20 Com site Rv(tud) 020 %Managed Turf 64% 63tL '% anagetl Turf 63% ReDev.Impervious ' Impervious Cover(acres) 1.29 1.29 Cover(acres) . 12a New Impervious Cover(acres) 0.15 Rv(impervious) ' .-.0.95 0.95 Rv(impervious) 0.05 Rv(impervious) .0.96 %Impervious "'38% 37% %Impervious 37% %Impervious 100% • Total ReDev.Site Total Site Area(acres) ' ''3.00 3.45 Area(acres) 3.45 Total New Dee.Site Area(acres) -- 0.15 Site Rv 0.47 0.48 ReDev.Site Rv 0.48 New Dee.Site Rv 4. 0.95 Post- ' ReDevelopment Treatment Volume Post-Development Treatment , • Pre-Development Treatment Volume(acre-ft) 0.1406 0-1381 (acre-ft) . • 0.1381 Volume(acre-ft) . 0.0119 ' Post- - ReDevelopment i. " Pre-Development Treatment Volume(cubic .. Treatment Volume ' ' Post-Development Treatment - feet) 5.125 6.017 (cubic feet) . 6,017 Volume(cubic feet) 517 Post- • ' ReDevelopment . •Pre-Development Load(TP)(lb/yr) `.3.86 '• 3.78 Load(TP)(Ib/yr) 3.78 Post-Development Load(TP)(Ib/yr) . 0.33 'Adjusted Land Cover Summary reflects the pre redevelopment Maximum%Reduction Required Below land cover minus the pervious land cover(foresVopen space or Pre-ReDevelopment Load ' , ''20% managed turf)acreage proposed for new Impervious cover.The adjusted total acreage is consistent with the Post Redevelopment TP Load Reduction Required for TP Load Reduction Required for acreage(minus the acreage of new impervious cover).The load Redeveloped Area(Iblyr) '. 0.75 New Impervious Area(Iblyr) 0.26 reduction requriement for the new impervious cover to meet the new development load limit is computed in Column I. 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D 'EDD as as .wm...'c..,me Si • ad a•. ;SY. a. �3 aY "ab' a. a a . a 'a3 ,,, WO ao w�......amo .m.,.me..nua. 114.u.luww.1 Ina at a a➢, etc a , ., as; as. a6. - e. ,ae,,, , as Sc .w..m.o.. A as a w - a.' a¢ _ 'e. s 616. .4,44.646444 441.4e,44.6.16 64441 a.row.al a. a a.¢ To.% ' a , • 44 as a 666444,666664440 664 e6 4 6 .4 ..ae 146 n IW.,w 00w0 P. I1.I...2 w,rq.. taw.w 1661 tw 66 1661 141 161 41 .4' .46 4446 una ...an.. .n . Inn now 4646/ 46666.6.a..+,.m ..a+. .ra, 0.0 sm.. •mom n..m1a�..n b.�e..wlm ..o.t...•m m1a...4 4464 .w ^� v..e1w ~ aa'IaA H¢en6 eanpea aN at.ny a..,.....acaa..m eaaaama'tidy { } { r Site Results D.A.A D.A.B D.A.C D.A.D • D.A.E AREA CHECK IMPERVIOUS COVER a 0.70 '- . •0,00 Atatoomm I.OTIS „0,,0 ,--1,O.O0 -`,..3 i7-^rO-00 OK. IMPERVIOUS COVER TREATED,.ce:3 'r 4T 0.74- - 'c 0.130. - V b.,.'.O.O0 T•; ° 70,00'•• ^-::T•�.;,O,OO OK. TURF AREA".•., s-s•.ra•+I,01 $.�,." OK. TURF AREA TREATED," ;,-... 1.01 1-1.00r .. * ,.+RO0 ,,,.A.OA " ,4 0AD OK. AREA CHECK OK. OK. „ OK. V OK. • OK. Phosphorous r I TOTAL PHOSPHOROUS LOAD REDUCTION REQUIRED(LBIYEAR)I ' 1.0sj • RUNOFF REDUCTION(cf( . .<„s 1t PHOSPHOROUS LOAD REDUCTION ACHIEVED(LB/YR(«:„ -':a 1,344 ADJUSTED POST-DEVELOPMENT PHOSPHOROUS LOAD(TP)013fyrl1 2.70I REMAINING PHOSPHOROUS LOAD REDUCTION(LB/YR)NEEDEDICONGRATULATIONSII YOU EXCEEDED THE TARGET REDUCTION BY 0.3 LBIYEARI• Nitrogen(for Information purposes) RUNOFF REDUCTION(cf) <,:'. 1 NITROGEN LOAD REDUCTION ACHIEVED(LBIYRI •;•e, 1& ADJUSTED POST.DEVELOPMENT NITROGEN LOAD(TP)(lhlyr !Mid , Virginia Runoff Reduction Method Worksheet Virginia Runoff Reduction Method ReDevelopment Worksheet-v2.8-June 2014 Site Data Summary Total Rainfall=43 inches Site Land Cover Summary A Soils B Soils C Soils D Soils Total %of Total Forest(acres) 0.00 0.00 0.00 0.00 0.00 0.00 Turf(acres) 0.00 2.16 0.00 0.00 2.16 60.00 Impervious(acres) 0.00 1.44 0.00 0.00 1.44 40.00 3.60 100.00 Site Rv 0.50 Post Development Treatment Volume(ft') 6534 Post Development TP Load(Ib/yr) 4.11 Post Development TN Load(lb/yr) 29.37 Total TP Load Reduction Required(Ib/yr) 1.02 Total Runoff Volume Reduction(ft') 1557 Total TP Load Reduction Achieved(Ib/yr) 1 Total TN Load Reduction Achieved(Ib/yr) 11.19 Adjusted Post Development TP Load(Ib/yr) 2.76 Remaining Phosphorous Load Reduction(Lb/yr)Required • 0.00 Drainage Area Summary _ .D.A.A D.A.B D.A.C D.A.D D.A.E Total Forest(acres) 0.00 0.0110.00 0.00 0.00 0.00 Turf(acres) 1.61 0.00 0.00 0.00 0.00 1.61 Impervious(acres) 0.79 0.00 0.00 0.00 0.00 0.79 2.40 Drainage Area Compliance Summary D.A.A D.A.B D.A.C D.A.D D.A.E Total TP Load Red.(Ib/yr) 1.34 0.00 0.00 0.00 0.00 1.34 TN Load Red.(Ib/yr) 11.19 0.00 0.00 0.00 0.00 11.19- Summary Print Virginia Runoff Reduction Method Worksheet Drainage Area A Summary Land Cover Summary A Soils B Soils C Soils D Soils Total %of Total Forest(acres) 0.00 0.00 0.00 0.00 0.00 0.00 Turf(acres) 0.00 1.61 0.00 0.00 1.61 67.08 Impervious(acres) 0.00 0.79 0.00 0.00 0.79 32.92 2.40 BMP Selections Practice Credit Area(acres) Downstream Practice 6.a.Bioretention#1 or Urban Bioretention(Spec#9) Impervious: 0.79 Turf(Pervious): 1.61 Total Impervious Cover Treated(acres) 0.79 Total Turf Area Treated(acres) 1.61 Total TP Load Reduction Achieved in D.A.A(Ib/yr) 1.34 Total TN Load Reduction Achieved in D.A.A(Ib/yr) 11.19 Summary Print