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HomeMy WebLinkAboutWPO201600019 Calculations 2015-06-29 Virginia Runoff Reduction Method ReDevelopment Worksheet-v2.8-June 2014 To be used w/2011 BMP Standards and Specifications Site Data F i Project Name:Farmington East 9 Date: Rev.June 29,2015 calculation cells- 7 __ ---__--i- --- - - 1 _- -- - • constant values - - --- --- -- - Post-ReDevelopment Project&Land Cover Information Total Disturbed Acreage 33.77 1 Constants - -- -- ------ --------------- - - -- nches) Annual Rai lI ---- ��-_---- ----_-- _ _ -- i Target Rainfall Evenfnches 1.00 PhosQoms EMC(mg/Lf 0.26 Nrgflen EMC1m9/LI 18 i Target Phosphorus Target Load(Ib/acre/Yr) 0.41 -_-_ -- - -- - - - --- - - --- P) - - - - 0.90 - - - - - - I - - -- - - - - Pre-ReDevelopment Land Cover(acres) - -�- A soils B Soils !C Soils D Soils Totals Forest/Open Space(acres)--undisturbed, - __ - - _ - f protected forest/open space or reforested land - --.0.41,--- g a ( 4 - :- a ( - - :, 0,00 Managed Turf(acres)--disturbedgraded for -. - f - -to - - -- -- - - - - - - - yardsorotherturftobemowed/managed ;jrk _•" ,:4'4;1"'L---.' - ,,g > ,� 3147- - -_---_ - Impervious Cover(acres)___ I- -- - - -- ----- - , Total 3317 Post-ReDevelopment Land Cover(acres) A soils B Soils C Soils D Solis Totals Forest/Open Space(acres)-undisturbed, �'�g(�-_ .^�:""'''' ,rµ. -r ;�` _ - - - protected forest/open space or reforested land 4 -.s w+ -�4- - " - -:--,----444;:,,,.-:-„,- "$.%i - _--- _ ---- - yManagedTurf(acres)be)iowrd/m,nagedfor --i '-'4T .'.-- '_ _,} -,_4�, - t- ards or Impervious Cover acres ----�'-` ---------- - - Total 33.77 Area Check other turf to mowed/managed Okay a Okay T Okay s Okay - - _ _ _ - -I Rv Coefficients 7 _ A soils B Soils C Soils D Soils -- - 4-- --____ - -- - __-___-__--T---- -_ ForesVOpen Space 0.02 0.03 0.04 0.05 t Managed Turf 0.15 0.20 0.22 0.25 Impervious Cover 0.95 0.95 095 0.95 _ 1 - IlLand Cover Summar rr_ _ Listed Adjusted Land Cover Summary Land Cover Summary R.Development Post-ReDevelo�nt 1 Post ReDevelopment New Impervious 11.111.! Fore (acre Space st/Open Space Cover(acres) Cover(acres) 3.1 r_ Composite posite Rv(forest) ` Rv(forest) - QQ3rest ". %Fores[- Managed Turf aged Turf Cover(acres 1. Cover(acres) 20posite Rv(turf) Composite Rv(turf) .0 + __ _anaged Turf %Managed Turf - d4 - ReDev.Imperviousrvious Cover(aces) _ Cover(acres) 2.-+ _ New Impervious Cover(acres) 0.00 rvious 0. Rv(impervious) A-- Rv(impervious) 0.06 ervious - %Im erviousp p 7Yt %Impervious 1ppyRTotal ReDev.Site l Site Area(acres) 93. - Area(acres) 33.09 Total New Dev.Site Area(acres) 0.00 Rv 0 ReDev.Site Rv 0.24 New Dev.Site Rv 0.05 Post- ReDevelopment Treatment VolumePost-Development Treatment evelo ment Treatment Volume acre-ft 0. 0. (acre-ft) Q,001 Volume(acre-ft) 0.0003 Post- ReDevelopment evelopment Treatment Volume(cubic Treatment Volume Post-Development Treatment 1 cubic feet) 28,808 Volume(cubic feet) 276 ost- ReDevelopment evelopment Load(TP)(Ib/yr) 10. 1A. Load(TP)(lb/yr) 10.1. Post-Development Load(TP)(Ib/yr) 0.17 Ad usted Land Cover Summaryreflects the re redevelopment --+-- � / P P Maximum%Reduction Required Below land cover minus the pervious land cover(forest/open space or I Pre-ReDevelopment Load r' f------ managed turf)acreage proposed for new Impervious cover.The i - adjusted total acreage is consistent with the Post Redevelopment f ------ acreage(minus the acreage of new impervious cover).The load TP Load Reduction Required for TP Load Reduction res(lbtyred for reduction requdement for the new impervious cover to meet the new i Redeveloped Area(Ib/yr) 2.00 --- New Impervious Area(Ib/yr) 0.14 ' development load limit is computed in Column I. - ------ .---- - . 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OK OK OK Phosphorous TOTAL PHOSPHOROUS LOAD REDUCTION REQUIRED(LB/YEAR) RUNOFF REDUCTION(cf) M60 PHOSPHOROUS ACHIEVED(LBNR) 2.03 t 16A6 AD N ADJUSTED POST-DEVELOPMENT PHOSPHOROUS LOAD(TP)(Ib/yr) ___ REMAINING PHO PHOROUSOLOAD R DUCTTION(LB/YR))NEEDED CONGRATULATIONS"YOU EXCEEDED T HE TARGET REDUCTION EY 0 LB/YEAR" Nitrogen(for information purposes) --- _ - -- _ - - -_- 1- 1 1 RUNOFF REDUCTION(cf)/Y4400 NITROGEN LOAD REDUCTION ACHIEVED(LB/YR) 20.20 I - - _ ---_ ---__ -- ADJUSTED POST.DEVELOPMENT NITROGEN LOAD(TP)(Ib/yr)1 110.461 1-year storm 2-year storm 10-year storm Target Rainfall Event(in) 3.00' $70 680 Drainage Area A - --------- ---- ------- - { --- -- ----- -- - - -- Drainage Area(acres) 33.77 Runoff Reduction Volume( 4,480 Drainage Area B Drainage Area (acres) 0.a Runoff ( Reduction off R uction Volume 1 Drainage Area C Drainage Area(acres) 0.00 Runoff Reduction Volume(cf) p Drainage Area D Drainage Area(acres) 0.01 Runoff Reduction Volume(cf) Drainage Area E Drainage Area(acres) 0.00 Runoff Reduction Volume(cf) p Based on the use of Runoff Reduction practices in the selected drainage areas,the spreadsheet calculates an adjusted RVc,,,,io„,d and adjusted Curve Number. Drainage Area A A soils B Soils C Soils 1D Soils Forest/Open Space--undisturbed,protected forest/open Area(acres) 0,00 3.10 0.00 0.00 _ space or reforested land CN 30 55 70 77 Managed Turf--disturbed,graded for yards or other turf to be Area(acres) 0.00 ' 28.29 0.00 0.00 mowed/managed CN 39 61 74 80 ' Area(acres) 0.00 2.38 0.00 0.00 Impervious Cover _ _ _ CN 98 98 98 98 RVB,..„.„,,,,,, with no Runoff Reduction Weighted CN S (in) 1-ear storm 088 83 I 5.87 _- - - _ �2-ear storm 10- ear storm 0.78 1.90 RVe,,,pd(in)with Runoff Reduction 0.62 0.72 1.87 - -_- lAdjustoted CN 62 et 83 Drainage Area B A soils B Soils C Soils D Soils Forest/Open Space--undisturbed,protected forest/open Area(acres) 0.00 0.00 0.00 0.00 space or reforested land CN30 55 70 77 , Managed Turf--disturbed,graded foror yards or other turf to be Area(acres) 0.00 040 0.00 0.00 mowed/managed CN 39 61 74 80 Impervious Cover Area(acres) 0.00 0,00 0.00 0.00 CN 98 98 98 98 1-year storm Weighted CN S o. ( _ 0 1000.00 2-year storm 10-year storm RV m)with no Runoff Reduction 0.00 0.00 0.00 RVe,,,ip,d(in)with Runoff Reduction O,Ob 0 l0 - 0.00 ,- Adjusted CN /NIA IMNA MIA Drainage Area C A soils B Soils C Soils D Soils Forest/Open Space--undisturbed,protected forest/open Area(acres) 0.00 0.00 0.00 0.00 space or reforested land al 30 55 70 77 Managed Turf--disturbed,graded for yards or other turf to be Area(acres) 0.00 0.00 0.00 0.00 mowed/manned CN 39 61 74 80 Area(acres) 0.00 0.00 0.00 0.00 Impervious Cover CN 98 98 98 98 Weighted S --- 0 1000.00 1-y 2• ear storm year storm 1�ear storm RVp„ d(.m) 0.00 with no Runoff Reduction0.Q0 0.00 -- RV0,,.,k p,d(in)with Runoff Reductio n 0.00 0.00 0.00 Adjusted CN /NA BNA MIA Drainage Area D J A soils B Soils C Soils D Soils Forest/Open Space--undisturbed,protected forest/open Area(acres) 0.00 0.00 0.00 0.00 space or reforested land CN 30 55 70 77 Managed Turf-disturbed,graded for yards or other turf to be Area(acres) 0.00 0.00 0.00 0.00 mowed/managed CN 39 61 74 80 Area(acres) 0.00 0.00 0.00 0.00 Impervious CoverCN 98 98 98 98 W 9 ei Med CN S 0 1000. 00 0.00 1-year storm 2-year storm 0.00'10-year storm RV,,,, (in)with no Runoff Reduction0.00 RVp„,,,p,d(in)with Runoff Reductio n 0.00 0.00 0.00 (Adjusted CN BNA BNA #INA i Drainage Area E A soils B Soils C Soils D Soils Forest/Open Space--undisturbed,protected forest/open Area(acres) 0.00 0.00 0.00 0.00 space or reforested land CN 30 55 70 77 Managed Turf--disturbed,graded for yards or other turf to be Area(acres) 0.00 0.00 0.00 0.00 mowed/managed CN 39 61 74 80 Area(acres) 0.00 0.00 0.00 0.00 Impervious Cover CN 98 98 98 98 Weighted CN S 0 1000.00 1-year storm 2-year storm 10-year storm RVe,,,,bp.a(in)with no Runoff Reduction 0.00 0.00 0.00 RVD., (in)with Runoff Reduction 0.00 0.00 0.00 'Adjusted CN iWA /WA INA 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 3.10 0.00 0.00 3.10 9.18 Turf(acres) 0.00 28.29 0.00 0.00 28.29 83.77 Impervious(acres) 0.00 2.38 0.00 0.00 2.38 7.05 33.77 100.00 Site Rv 0.24 Post Development Treatment Volume(ft) 29084 Post Development TP Load(lb/yr) 18.27 Post Development TN Load(lb/yr) 130.72 Total TP Load Reduction Required(Ib/yr) 2.80 Total Runoff Volume Reduction(ft3) 4480 Total TP Load Reduction Achieved(Ib/yr) 3 Total TN Load Reduction Achieved(Ib/yr) 20.26 Adjusted Post Development TP Load(Ib/yr) 15.45 • 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) _ 3.10 0.00 0.00 0.00 0.00 3.10 Turf(acres) 28.29 0.00 0.00 0.00 0.00 28.29 Impervious(acres) 2.38 0.00 0.00 0.00 0.00 2.38 33.77 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) 2.83 0.00 0.00 0.00 0.00 2.83 TN Load Red.(Ib/yr) 20.26 0.00 0.00 0.00 0.00 20.26 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 3.10 0.00 0.00 3.10 9.18 Turf(acres) 0.00 28.29 0.00 0.00 28.29 83.77 Impervious(acres) 0.00 2.38 0.00 0.00 2.38 7.05 33.77 BMP Selections Practice Credit Area(acres) Downstream Practice 9.a.Sheetflow to Conservation Area with A/B Soils(Spec a#2) Impervious: 0.32 Turf(Pervious): 6.32 Total Impervious Cover Treated(acres) 0.42 Total Turf Area Treated(acres) 6.42 Total TP Load Reduction Achieved in D.A.A(Ib/yr) 2.83 Total TN Load Reduction Achieved in D.A.A(Ib/yr) 20.26 Summary Print Virginia Runoff Reduction Method Worksheet Channel and Flood Protection Weighted CN 1-year 2-year storm 10-year storm Adjusted CN storm Adjusted Adjusted CN CN Target Rainfall Event(in) 3.50 3.70 5.60 D.A.A CN 63 62 62 63 D.A.B CN 0 #N/A #N/A #N/A D.A.C CN 0 #N/A #N/A #N/A D.A.D CN 0 #N/A #N/A #N/A D.A.E CN 0 #N/A #N/A #N/A Summary Print Version 2.8 -June 2014-2011 BMP Stnds &Specs 1 Fixed summary sheet-totals/percentage column fixed 2 Corrected nitrogen efficiency percentages 3 Corrected the Rv value in column J for managed turf 4 Checked and revised runoff reduction credit values assigned