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HomeMy WebLinkAboutWPO201500064 Calculations 2016-02-23 • Ned Virginia Runoff Reduction Method New Development Worksheet--v2.8_2011Specs Site Data Revised April 2014 Project Name: Davis Residence Driveway Date: 10/6/15(REVISED 2/23/16) data input cells calculation cells constant values 1. Post-Development Project& Land Cover Information Constants Annual Rainfall(inches) 43 _ Target Rainfall Event(inches) 1.00 Phosphorus EMC(mg/L) 0.26 I Nitrogen EMC(mg/L) 1.86 Target Phosphorus Target Load(Ib/acre/yr) 0.41 Pj 0.90 Land Cover (acres) A soils B Soils 'C Soils D Soils Totals Forest/Open Space(acres)--undisturbed, protected forest/open space or reforested land 0.004110 0.00 0.00 1.33 Managed Turf(acres)--disturbed,graded for yards or other turf to be mowed/managed 0.00 1.35 0.00 0.00 1.35 Impervious Cover(acres) 0.00 0.42 0.00 0.00 0.42 Total 3.10 Rv Coefficients A soils B Soils C Soils 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 Forest/Open Space Cover(acres) 1.33 Weighted Rv(forest) 0.03 %Forest 43% Managed Turf Cover(acres) 1.35 Weighted Rv(turf) 0.20 _ %Managed Turf 44% Impervious Cover(acres) 0.42 Rv(impervious) 0.95 Impervious 14% _ Total Site Area(acres) 3.10 Site Rv 0.23 Post-Development Treatment Volume(acre-ft) 0.06 Post-Development 1 reatment Volume(cubic feet) 2,582 Post_Development Load(TP)(lb/yr) 1.62 Post_Development Load(TN)(Ib/yril 11.611 Total Load(TP)Reduction Required(Ib/yr) 0.35 / ) TO - m6 T- k />,/1e5P/Ive2t,v� wiL Y✓� PP-aV I PhJZ( C-01Ji&e.YgTl o,J A EA _ 1/6 qign 77- c 116e-TPl-o 70 TV& Co 624;77a-v 102 (z (2 D2 i tk,r4 i) /5 77frAL Co/.S2vq11o2,) •r4u To 133 A • /35 5 462 S /JAS c fQOV' W-C P1-390 (sb c,i 9 Ft41.0 ti Near ..wm.. ro.f 4441 , AppYRpnoRFeEuca on PavcllceamH.Emce Tnebnerrt VwumeBPwt DerelQpmSntLwtlin Orelnepe AneN-�-- - --- - - -- --_-- __--- � --� _- - ': -� ----- ,m.d.o..r. ry�I wtar rndw ur Q.w IoM _ r • mr as .......e n<W 1.P,ann ,ae pm pao R..wmunwl4«e1 ..w �, ... .. i ___ ____ e.. i Y'g L,<,..,:.Ate-.. 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IMPERVIOUS COVER TREATE" 0141 0:00 C D01 O 001 0 001 --- ___ D.09 'OmQI O.00 TURF AR Ai 35 0O 000 006 000 TURF AREA TREATEI :37 0.00 AREA CHEC• GKG� I UF: i Phosphorus --- --- ----- --..�_ ._— ------- TOTAL TREATMENT VOLUME(cf);.... 2,882, TOTAL PHOSPHORUS LOAD REDUCTION REQUIRED(LB/YEAR)"- 0.35 RUNOFF REDUCTION IcD SS{ PHOSPHORUS LOAD REDUCTION ACHIEVED(LB/YE 0.35 • � ---- ADJUSTED POST-DEVELOPMENT PHOSPHORUS LOAD(TP)(1131r) 727', ., - - -_ --- 1 REMA NING PHOSPHORUS LOAD t Nitrogen(for information pU rPp4$'REDUCTION(LB/YR)NEEDED CQNGRATUJ+.IONS11 YOU EXCEEDED THE TARGET REDUCTION BY 0 LB/YEARI ! TOTALTREATMENTVOLUME(d) e — NITROGEN LOAD REDUCTION ACHIEVED(LBIYRI _._ --1RUNOFF REDUCTION cf) `654 ADJUSTED POST-DEVELOPMENT NITROGEN LOAD(TN)(Ib/yr)) "" 1 1-year storm '2-year storm 10-year storm Target Rainfall Event(in) �- q} r/«f,, g�' g Drainage Area A - - - - _- -- --- Drainage Area(acres) 2.57' Runoff Reduction Volume(cf) 564 Drainage Area B Drainage Area(acres) 0.00 Runoff Reduction Volume(cf) 0 Drainage Area C --_-- Drainage Area(acres) 0.00 Runoff Reduction Volume(cf)__I 0 Drainage Area D Drainage Area(acres) 000' Runoff Reduction Volume(cf) 0 Drainage Area E Drainage Area(acres) 0.00 Runoff Reduction Volume(cf) 0 Based on the use of Runoff Reduction practices in the selected drainage areas.the spreadsheet calculates an adjusted RVr,,,,i,pea and adjusted Curve Number. I Drainage Area A _ A soils B Soils C Soils D Soils Forest/Open Space-undisturbed,protected forest/open Area(acres) 0.00 0 80 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 . 1.35 . 0.00 .0.00 mowed/managed CN 39 61 74 80 Area(acres) 0.00 0.42 0.00 0:00 Impervious Cover CN 98 98 98 98 Weighted CN 'S 65 1, tat 1-year storm 2-year storm 10-year storm RVo.,.,i,,,d(in)with no Runoff Reduction 0.00 0.00 0.00 I RVo„„y,.e(in)with Runoff Reduction -0.06 ,-0.06 -0.06 Adjusted CN #N/A #N/A #N/A Drainage Area B A soils iB Soils C Soils ID 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 _ Impervious Cover Area(acres) 0 00 0 00 0 00 0.00 CN 98 98 98 98 - --- Weighted CN S J 0 1 1000.00 1-year storm 2-year storm 10-year storm RVD..Ie,.d(in)with no Runoff Reduction 0.00 0.00 000 o.,..i,,.e in witRunoffa uction 0.00 0 00 0.00 I Adjusted CN 100 100 100 I Drainage Area C _ A soils B Soils C Soils 10 Soils I Forest/Open Space-undisturbed,protected forest/open Area(acres) 0.00 0.00 0.00 0.00 space or reforested land GN 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 GN 39 61 74 80 Area(acres) 0 00 0.00 0.00 0 00 Impervious Cover CN 98 98 98 98 Weighted CN S _._._._. 1 0 1 100000 1-year storm 2-year storm 10-year storm RVe.,.i,,,.(In)with no Runoff Reduction 0.00 0.00 0.00 RVo.,.y„d(In)with Runoff Reduction 0.00 0.00 0.00 Adjusted CN 100 100 100 _.. _. - i Drainage Area D A soils IB Soils C Soils D Soils Forest/Open Space-undisturbed,protected forest/open Area(acres) ' ;0:00 000 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 4, 1000.00 1-year storm 2-year storm 10-year storm RVe.,..i,,,.d(in)with no Runoff Reduction 000 0.00 0 00 RVD.,,.i,p.d(In)with Runoff Reduction 0 00 0 00 0 00 Adjusted CN 100 100 100 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 yard._other turf to be Area(acrW rz 0.00 - 000 < 0 mowed/managed CN 39 61 74 e Area(acrw 0 0.00 :m . o Impervious Covr CN s 95 98 98 Weighted CN S . . . . . . . . . . / < 0 1 1000A 1-year storm 2-year storm 10-year storm -__(in)with no Runoff RedQ 0. . . .0< . 0.00 ___Mwith Runoff Reduction 0 0 00 0.00 ! Adjusted CN 100 100 100 \ � \ ) } ) . ) ) � ) \ ) ) ) ) ) ] \ ) ) ) ) ) ) . ) ) ] � ! . ) ) ) � Virginia Runoff Reduction Method Worksheet Virginia Runoff Reduction Method New Development Worksheet-v2.8_2011Specs Site Data Summary Total Rainfall= 43 inches 17 Site Land Cover Summary A Soils Foil? C Soils D Soils Total %of Total Forest(acres) 0.00 1 0.00 0.00 1.33 42.87 Turf(acres) 0.00 --/. 0.00 0.00 1.35 43.51 Impervious(acres) 0.00 0.42 0.00 0.00 0.42 13.62 3.10 100.00 Site Rv 0.23 Post Development Treatment Volume(ft3) 2582 Post Development TP Load(Ib/yr) 1.62 Post Development TN Load(Ib/yr) 11.61 Total TP Load Reduction Required(Ib/yr) 0.35 Total Runoff Volume Reduction(ft') 564 Total TP Load Reduction Achieved(Ib/yr) 0 Total TN Load Reduction Achieved(Ib/yr) 3.37 Adjusted Post Development TP Load(lb/yr) 1.27 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) 0.80 0.00 0.00 0.00 0.00 0.80 Turf(acres) 1.35 0.00 0.00 0.00 0.00 1.35 Impervious(acres) 0.42 0.00 0.00 0.00 0.00 0.42 2.57 Drainage Area Compliance Summary D.A.A D.A.I3 D.A.C D.A.D D.A.E Total TP Load Red.(lb/yr) 0.35 0.00_ 0.00 0.00 0.00 0.35 TN Load Red.(lb/yr) 3.37 0.00 0.00 0.00 0.00 3.37 Summary Print fi Virginia Runoff Reduction Method Worksheet 'Now Drainage Area A Summary Land Cover Summary A Soils B Soils C Soils D Soils Total %of Total Forest(acres) 0.00 0.80 0.00 0.00 0.80 31.13 Turf(acres) 0.00 1.35 0.00 0.00 1.35 52.53 Impervious(acres) 0.00 0.42 0.00 0.00 0.42 16.34 2.57 BMP Selections Practice Credit Area(acres) Downstream Practice 9.a.Sheetflow to Conservation Area with A/B Soils(Spec#2) Impervious: 0.21 Turf(Pervious): 0.6 Total Impervious Cover Treated(acres) 0.14 Total Turf Area Treated(acres) 0.37 Total TP Load Reduction Achieved in D.A.A(Ib/yr) 0.35 Total TN Load Reduction Achieved in D.A.A(Ib/yr) 3.37 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) 0.00 0.00 0.00 D.A.A CN 65 #N/A #N/A #N/A D.A.B CN 0 100 100 100 D.A.C CN 0 100 100 100 D.A.D CN 0 100 100 100 D.A.E CN 0 100 100 100 Summary Print avnawavtiWOr I .1:7.44G N-:' 1r Y `13.1V V waan "gag a g/' '''N� r .. r ,�, GCE 1;7�bd tr4 dbW XVI ais e vGTIBeauaYorwe '+ I bN� IdW r j44' � JNlEN9NgdN ""^- """"._^ MS 371,13G1531 5i/4G.. _ 1 ; 1 1 1 1 \ , , , 1 \ 1 1 1 i ; , 1 I w`, 1 1 I 1 1 1 , 1\, , 1 1 Itk,:\ I 1 1, ! ; f 11 ; tl t \ 11 `; '\\ f 1 •\ ``\l tl 1 1 1 Ir - ` 1 F� ! 1, 1 1 ;i, I 1 I 1 ! / r t ' /' 1 `t `, t r , i 1 1 1 „ ,-. . 1 1 -~ 0: - - — — I 1, i ' 1/ / !+ f it i1 i ( 1+ '\, / ; \ 1 ;'' 1 1 r , 1 1 !' 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Post-Develop_ment Pject& Land Cover Information Constants Annual Rainfall(inches) Target Rainfall Rainfall Event(inches) 1.00 Phosphorus EMC(mgL) 0.26 Nitrogen EMC(mg/L) 1.86 Target Phosphorus Target Load(Ib/acre/yr) 0.41 Pj 0.90 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 0.75 Managed Turf(acres)-disturbed,graded for yards or other turf to be mowed/managed L 0.00 1.35 0 00 0.00 1.35 Impervious Cover(acres) 0.00 O42 0 00 0,00 0.42 Total 2.52 Rv Coefficients A soils B Soils C Soils 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 Forest/Open Space Cover(acres) 0.75 Weighted Rv(forest) 0.03 %Forest 30% Managed Turf Cover(acres) 1.35 Weighted Rv(turf) 0.20 %Managed Turf 54% Impervious Cover(acres) 0.42 Rv(impervious) 0.95 °A,Impervious 17% Total Site Area(acres) 2.52 Site Rv 0.28 Post-Development Treatment Volume(acre-ft) 0.06 Post-Development Treatment Volume(cubic feet) 2,519 Post Development Load(TP)(Ib/yr) 1.58 Post_Development Load(TN)(lb/yr) 11.321 Total Load(TP)Reduction Required(Ib/yr) 0.55 • c- --17) -6c) cA- D iz AM C 0 R ..:.�.• Pr c ,o Fled u IIeRmen,v n Pmt 0ev 11111111.11111111111.1.1111111111.1111111111.111111z� - N -- .111111.11111111.11111111.1111.1 azgam -- _ • rw � w www� . .. www wwww wi i, ww■�!� 4144w-.4 - • w 4-wt ww ■w� MI ■ i iiiiiiiiiiiini .MIPRINGIPIPIPPIPIP=IMI ._ - , w _,_ .,. 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Phosphorus TOTAL TREATMENT VOLUME(Cf) 2519 TOTAL PHOSPHORUS LOAD REDUCTION REQUIRED(LB/YEAR) 0.55 RUNOFF REDUCTION(cf) 870 PHOSPHORUS LOAD REDUCTION ACHIEVED(LB/YR) 0.55 - - ADJUSTED POST-DEVELOPMENT PHOSPHORUS LOAD(TP)(Ib/yr) 1.04! REMAINING PHOSPHORUS LOAD REDUCTION(LBIYRI NEEDED 0.00 Nitrogen(for information purposes) TOTAL TREATMENT VOLUME(cf) 2,519 RUNOFF REDUCTION(cf) 870 , NITROGEN LOAD REDUCTION ACHIEVED(LB/VR) 5.21 ADJUSTED POST-DEVELOPMENT NITROGEN LOAD(TN)lb/yr)) 8.121 1-year storm 2 ar storm 10-year storm Target Rainfall Event(in) I • • • Drainage Area A Drainage Area(acres) 2.52 Runoff Reduction Volume(cf) 870 Drainage Area B Drainage Area(acres) 0.00 Runoff Reduction Volume(cf) 0 Drainage Area C, --_ -- Drainage Area(acres) 0.00 Runoff Reduction Volume(cf) 0•I Drainage Area D • Drainage Area(acres) 0.00 Runoff Reduction Volume(cf) [ • • 0 • Drainage Area E Drainage Area(acres) 0.00 Runoff Reduction Volume(cf) 0 Based on the use of Runoff Reduction practices in the selected drainage areas,the spreadsheet calculates an adjusted RVo. id and adjusted Curve Number. Drainage Area A A soils B Soils C Soils D Soils - Forest/Open Space-undisturbed,protected forest/open Area(acres) 0-00 0.75 0.00 0.00 grace or reforested land CN 30 55 70 77 _ Managed Turf-disturbed,graded for yards or other turf to be Area acres) 0.00 1.35 0.00 0.00 mowed/managed CN 39 61 74 80 . Area(acres) 0.00 0.42 0.00 0.00 Impervious Cover CN 98 98 98 98 Weighted CN S 65 1 5.38 1-year storm 2-year storm 10-year storm _ RVee„ei (in)with no Runoff Reduction 0.00 0.00 0.00 RVne,ewan(in)with Runoff Reduction -0.10 -0-10 .0.10 • Adjusted CN #N/A #N/A #N/A r 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 _pace 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 ------ Impervious Cover Area(acres) 0 00 0.00 0.00 000 CN 98 98 98 99 Weighted CN S 0 1 1000.00 - ----- ------ 1 1-year storm 2-year storm 10-year storm RVeever,oen(in)with no Runoff Reduction 0.00 0.00 0.00 - - RVDe.,ei,gea(in)with Runoff Reduction 0.00 0.00 0.00 I Adjusted CN 100 100 100 Drainage Area C i 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 1 1000.00 1-year storm 2-year storm 10-year storm RVD„,,, (in)with no Runoff Reduction 0.00 0.00 0.00 RVe.,..,e(in)with Runoff Reduction 0.00 0.00 0.00 L___- Adjusted CN 100 100 100 ._ -. Drainage Area D 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 I __ Weighted CN S --- 0 I_ 10000 1-year storm 2-year storm •10-year storm _...- RVD.,. a(in)with no Runoff Reduction 0.00 0.00 0.00 RVo.,.,,,.a(in)with Runoff Reduction 0.00 0.00 0.00 Adjusted CN 100 100 100 Drainage Area E A soils B Soils C Soils D Soils Forest/Open Space-undisturbed,protected forest/open Area(acres) 0.00 0.00 0.00 000 --- 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 - 1 Weighted CN S --_ I 0 1000.00 1-year storm 2-year storm 10-year storm RVoeve'ucea(in)with no Runoff Reduction 0.00 0.00 0.00 RVo.v.j.p,d(in)with Runoff Reduction 0.00 0.00 0.00 — Adjusted CN 100 100 100 Virginia Runoff Reduction Method Worksheet 'vase Nowt Virginia Runoff Reduction Method New Development Worksheet--v2.8_2011Specs 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 0.75 0.00 0.00 0.75 29.73 Turf(acres) 0.00 1.35 0.00 0.00 1.35 53.52 Impervious(acres) 0.00 0.42 0.00 0.00 0.42 16.75 2.52 100.00 Site Rv 0.28 Post Development Treatment Volume(ft3) 2519 Post Development TP Load(lb/yr) 1.58 Post Development TN Load(lb/yr) 11.32 Total TP Load Reduction Required(Ib/yr) 0.55 Total Runoff Volume Reduction(f?) 870 Total TP Load Reduction Achieved(Ib/yr) 1 Total TN Load Reduction Achieved(Ib/yr) 5.21 Adjusted Post Development TP Load(Ib/yr) 1.04 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) 0.75 0.00 0.00 0.00 0.00 0.75 Turf(acres) 1.35 0.00 0.00 0.00 0.00 1.35 Impervious(acres) 0.42 0.00 0.00 0.00 0.00 0.42 2.52 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) 0.55 0.00 0.00 0.00 0.00 0.55 TN Load Red.(Ib/yr) 5.21 0.00 0.00 0.00 0.00 5.21 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 0.75 0.00 0.00 0.75 29.76 Turf(acres) 0.00 1.35 0.00 0.00 1.35 53.57 Impervious(acres) 0.00 0.42 0.00 0.00 0.42 16.67 2.52 BMP Selections Practice Credit Area(acres) Downstream Practice 9.a.Sheetflow to Conservation Area with A/B Soils(Spec#2) Impervious: 0.21 Turf(Pervious): 0.6 Total Impervious Cover Treated(acres) 0.21 Total Turf Area Treated(acres) 0.60 Total TP Load Reduction Achieved in D.A.A(Ib/yr) 0.55 Total TN Load Reduction Achieved in D.A.A(Ib/yr) 5.21 Summary Print r Virginia Runoff Reduction Method Worksheet NOVChannel and Flood Protection Weighted CN 1-year 2-year storm 10-year storm Adjusted CN storm Adjusted Adjusted CN CN Target Rainfall Event(in) 0.00 0.00 0.00 D.A.A CN 65 #N/A #N/A #N/A D.A.0 CN 0 100 100 100 D.A.C CN 0 100 100 100 D.A.D CN 0 100 100 100 D.A.E CN 0 100 100 100 Summary Print