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Home My WebLink AboutWPO201300075 Calculations 2015-02-16 WPO201300075 STORM WATER MANAGEMENT ENERGY BALANCE CALCULATIONS FOR COLES IMPORT SPECIALISTS DATED: February 16, 2015 LOCATION: Tax Map 45, Parcel 1008 Albemarle County, Virginia OWNER: KSR Investments Charlottesville, VA 22901 PREPARED BY: Meridian Planning Group, LLC 1413 Sachem Place, Ste 1 Charlottesville, VA 22901 434.882.0121 v,padth op Gr % O TIMeHY RAY MILLER Lic.No.30542 4 PRE-DEVELOPMENT 1-YEAR RUN-OFF DA-1 & DA-2 Pre-Development: 1-Year 24-Hour Runoff Hydroqraph TR-55 Tabular Hydrograph Method Input Data: Rainfall Distribution Type Type II Rainfall Depth 3.50 in Base Flow 0.00 cfs la/P Interpolation Off Subarea Downstream Area CN Tc Tt Name Subareas (acre) (hr) (hr) DA-1& DA-2 None 0.38 79 0.10 0.10 Computed Results: Peak Discharge (Qpre) 0.94 cfs Time to Peak 12.10 hrs Runoff Volume 0.03 acre-ft BASIN AND OUTLET PARAMETERS MULTIPLE OUTLET DESIGN Outflow Total Discharge 5.64 cfs Water Surface Elevation 517.50 ft Tailwater Elevation 516.00 ft Detention Base Elevation 0.00 ft Outlet#1: Orifice Shape Rectangular Rise 4.00 in Width 6.00 in Invert Elevation 516.00 ft Coefficient ... 0.60 Number of Openings 1 Maximum Discharge 0.93 cfs Velocity 5.56 ft/s Outlet#2: Weir Shape Rectangular w/o Contracted End Crest Length 4.00 ft Invert Elevation 517.00 ft Coefficient 3.33 Number of Openings 1 Maximum Discharge 4.71 cfs Velocity 2.35 ft/s STAGE-STORAGE REPORT Elev Storage Area (ft) (cf) (sf) 515.500 0.00 625.00 516.000 344.00 751.00 516.500 738.00 825.00 517.000 1181.00 947.00 517.500 1675.00 1029.00 POST-DEVELOPMENT 1-YEAR RUN-OFF DA-1: 1-Year 24-Hour Runoff Hydrojiraph TR-55 Tabular Hydrograph Method Input Data: Rainfall Distribution Type: Type II Rainfall Depth: 3.50 in Base Flow: 0.00 cfs la/P Interpolation: Off Subarea Downstream Area CN Tc Tt Name Subarea (acre) (hr) (hr) DA-1 DA-2 0.29 87 0.10 0.10 Computed Results: Peak Discharge (Qp) 1.00 cfs Time to Peak 12.10 hrs Runoff Volume 0.03 acre-ft DA-1: 1-Year 24-Hour Routed Hydrograph Storage Indication Method Input Files: Inflow Hydrograph Curve DA-1 1YR HYD.hyd Stage-Storage Curve Stage-Storage.cap Stage-Discharge Curve Stage-storage.stg Results: Inflow Peak Flow 1.00 cfs Inflow Peak Time 12.10 hr Routed Peak Flow 0.49 cfs Routed Peak Time 12.20 hr Maximum Pond Storage 0.0177 acre-feet Maximum Pond Elevation ..... 516.54 ft DA-2: 1-Year 24-Hour Runoff Hydrograph TR-55 Tabular Hydrograph Method Input Data: Rainfall Distribution Type Type II Rainfall Depth 3.50 in Base Flow 0.00 cfs la/P Interpolation Off Subarea Downstream Area CN Tc Tt Name Subarea (acre) (hr) (hr) DA-2 None 0.09 79 0.10 0.10 Computed Results: Peak Discharge (Qp) ... 0.22 cfs Time to Peak ... 12.10 hrs Runoff Volume 0.01 acre-ft DA-1 Routed and DA-2: Combined 1-Year 24-Hour Runoff Hvdrograph Peak Discharge (Qpost) 0.63 cfs Time to Peak 12.20 hrs ENERGY BALANCE EQUATION Qpost* Rv post < RF*Qpre*Rv pre RF 0.9 (Less than 1 Acre) Qpre 0.94 cfs Rv pre 1.57 Qpost 0.63 Rv post 2.05 0.9*0.94*1.57 = 1.30 0.63*2.05 = 1.29 1.29 < 1.30 POST-DEVELOPMENT 10-YEAR RUN-OFF DA-1: 10-Year 24-Hour Runoff Hydrograph TR-55 Tabular Hydrograph Method Input Data: Rainfall Distribution Type Type II Rainfall Depth 5.60 in Base Flow 0.00 cfs la/P Interpolation Off Subarea Downstream Area CN Tc Tt Name Subarea (acre) (hr) (hr) DA-1 DA-2 0.29 87 0.10 0.10 Computed Results: Peak Discharge (Qpost) ...... 1.89 cfs Time to Peak . 12.10 hrs Runoff Volume 0.06 acre-ft DA-1: 10-Year 24-Hour Routed Hydrograph Storage Indication Method Input Files: Inflow Hydrograph Curve DA-1 1YR HYD.hyd Stage-Storage Curve Stage-Storage.cap Stage-Discharge Curve Stage-storage.stg Results: Inflow Peak Flow 1.89 cfs Inflow Peak Time 12.10 hr Routed Peak Flow 1.21 cfs Routed Peak Time 12.20 hr Maximum Pond Storage 0.0294 acre-feet Maximum Pond Elevation 517.10 ft DA-2: 10-Year 24-Hour Runoff Hydrograph TR-55 Tabular Hydrograph Method Input Data: Rainfall Distribution Type Type II Rainfall Depth 5.60 in Base Flow ... 0.00 cfs la/P Interpolation Off Subarea Downstream Area CN Tc Tt Name Subarea (acre) (hr) (hr) DA-2 none 0.09 79 0.10 0.10 Computed Results: Peak Discharge (Qpost) .. . 0.47 cfs Time to Peak 12.10 hrs Runoff Volume 0.02 acre-ft DA-1 Routed and DA-2: Combined 10-Year 24-Hour Runoff Hydrograph Peak Discharge (Qpost) 1.51 cfs Time to Peak 12.20 hrs POST-DEVELOPMENT 100-YEAR RUN-OFF DA-1: 100-Year 24-Hour Runoff Hydrograph TR-55 Tabular Hydrograph Method Input Data: Rainfall Distribution Type Type II Rainfall Depth ... 7.15 in Base Flow 0.00 cfs la/P Interpolation Off Subarea Downstream Area CN Tc Tt Name Subarea (acre) (hr) (hr) DA-1 DA-2 0.29 87 0.10 0.10 Computed Results: Peak Discharge (Qpost) 2.57 cfs Time to Peak 12.10 hrs Runoff Volume 0.08 acre-ft DA-1: 100-Year 24-Hour Routed Hydrograph Storage Indication Method Input Files: Inflow Hydrograph Curve DA-1 100YR HYD.hyd Stage-Storage Curve Stage-Storage.cap Stage-Discharge Curve Stage-storage.stg Results: Inflow Peak Flow 2.57 cfs Inflow Peak Time 12.10 hr Routed Peak Flow 2.24 cfs Routed Peak Time 12.20 hr Maximum Pond Storage 0.0322 acre-feet Maximum Pond Elevation 517.22 ft Virginia Runoff Reduction Method ReDevelopment Worksheet v2.8 Revised April 2011 To be used with 2011 BMP Standards and Specifications Site Data Project Name: Coles Import Specialists Date:January 7,2015 I • data input cells -'.':,:,... ;.,, calculation cells constant values Post-ReDevelopment Project&Land Cover Information Total Disturbed Acreage "' 0.50 Constants Annual Rainfall(inches) 43" r' Target Rainfall Event(inches) 1.00 Phosphorus EMC(mg/L) 0.26 Nitrogen EMC(m0/L) 1.86 Target Phosphorus Target Load(Ib/acre/yr) 0.41 Pj 0.90 Pre-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 ,',11.00w')430„ 04*'. '0.41 a• . Managed Turf(acres)--disturbed,graded for .•", ° •, yards or other turf to be mowed/managed 0.00 0.00 :/1- " ,O0 ��+ 0.06 0:06 Impervious Cover(acres) , '0.00 -;„00I1 ,0,.00 9.03- 2.: 0.03 Total `-0:60 - Post-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 040 ` 0,00 0,00 0,02 0,02 Managed Turf(acres)--disturbed,graded for yards or other turf to be mowed/managed o',430, 0.00 0:00 0,25 i),25 Impervious Cover(acres) .0.00. . ', 0,00 ,• -,,: ; b 0.001. -0,23 ;!: : ., • ,0.23' . - • Total ,,,:•',:•0,50,• Area Check Okay Okay Okay Okay Rv Coefficients • A soils B Soils C Soils D Soils ForesVOpen 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 _Adjusted1 Land Cover Summary Land Cover Summary Pre-ReDevelopment Post-ReDevelopment Post-ReDevelopment New Impervious Forest/Open Space ~ Forest/Open Space Cover(acres) -- 0.41 ,', ''' 11 0.2Cover(acres) Composite Composite Rv(forest) :=• '.0:054 ,,: , :: .:-'.'S: 0.06 Rv(forest) :,•:,::,-v°'"'' 0.05, %Forest ' 92% . 70% %Forest • ,7% ' Managed Turf Managed Turf Cover(acres) 0.06 0.06 Cover(acres) 0.25 Composite Rv(turf) 0.25 0.25 _ Composite Rv turh ,, - 0.25 _ _ %Managed Turf 12% •20% %Managed Turf 83% ReDev.Impervious Impervious Cover(acres) 0.03 008 Cover(acres) ,- 0.03 New Impervious Cover(acres) - 0.20 Rv(impervious) 0.95 0:95 Rv(impervious) .>i; 0.95 Rv(impervious) 0.95 %Impervious 5% ':', ' ' 10% %Impervious , `'-r10% %Impervious 100% Total ReDev.Site Total Site Area(acres) 0,50 '' 0.30 Area(acres) ' 0,30 Total New Dev.Site Area(acres) ' 0.20 Site Rv 0,13 0.16 ReDev.Site Rv . . 0.31 New Dev.Site Rv 0.95 Post- ReDevelopment Treatment Volume Post-Development Treatment Pre-Development Treatment Volume(acre-ft) , 0,0053 ' ,0.0045 (acre-ft) ' '0.0077 Volume(acre-ft) 0.0158 Post- ReDevelopment _?' Treatment Volume Post-Development Treatment Pm-Development Treatment Volume(cubic feet) ' ' 232 196 (cubic feet) '.334 Volume(cubic feet) 690 Post- ReDevelopment Pre-Development Load(TP)(lb/yr) 6.15 0.12 Load(TP)(Ib/yr) '• 0.21 Post-Development Load(TP)(Ib/yr) 0,43 Adjusted Land Cover Summary reflects the pre redevelopment land Maximum%Reduction Required Below cover minus the pervious land cover(forest/open space or managed Pre-ReDevelopment Load . - - 10% turf)acreage proposed for new impervious cover. The adjusted total I acreage is consistent with the Post Redevelopment acreage(minus TP Load Reduction Required for TP Load Reduction Required for the acreage of new impervious cover). The load reduction Area Redeveloped (1b/yr),„ requriement for the new impervious cover to meet the new ( Y) 0,10 New Impervious Area(Ib/yr) 0.35 development load limit is computed in Column I. 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II 1111111111 SE' 17' •11111111 1111111111 :.,,,.-.•i; III 11111 IIIIIIIIIIII 111 Ell] I I III Hill I . , , , , ,.,. 1 1 III to ! „: , 1 . . . 2 - P Illi ill t t 3 [ E 1 Site Results D.A.A D.A.B D.A.C D.A.D D.A.E AREA CHECK IMPERVIOUS COVER 0,23 Et.OD 0.00"" OAO " 0.00 OK. IMPERVIOUS COVER TREATED 0.23 0.00 0.00 :. 0.00 0.00 OK. TURF AREA 0.25 Q 00 flA0" 0.00 0.00 OK. TURF AREA TREATED 0.0$ 0.00 0.00, 0.00 0.00 OK. AREA CHECK OK. OK. OK. OK. OK. Phosphorous TOTAL PHOSPHOROUS LOAD REDUCTION REQUIRED(LB/YEAR)f, 0,40I RUNOFF REDUCTION(cf) 071 PHOSPHOROUS LOAD REDUCTION ACHIEVED(LB/YR) ; , , , 0.47_ ADJUSTED POST-DEVELOPMENT PHOSPHOROUS LOAD(TP)(Ib/yr)[ REMAINING PHOSPHOROUS LOAD REDUCTION(LB/YR)NEEDEDICONGRATULATIONSII YOU EXCEEDED THE TARGET REDUCTION BY 0 LB/YEAR!! Nitrogen(for information purposes) RUNOFF REDUCTION(cf) 87t NITROGEN LOAD REDUCTION ACHIEVED(LB/YR)? 3.41 ADJUSTED POST-DEVELOPMENT NITROGEN LOAD(TP)(Ib/yr)L 1.i4f I 1-year storm 2-year storm 10-year storm Target Rainfall Event(in) 3.50 ' " ,'3,70 ' 5.6b Drainage Area A Drainage Area(acres) 0:50 Runoff Reduction Volume(cf) 671 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 Drainage Area D Drainage Area(acres) 0,00 Runoff Reduction Volume(cf) 0 Drainage Area E Drainage Area(acres) D,DO Runoff Reduction Volume(cf) 0 Based on the use of Runoff Reduction practices in the selected drainage areas,the spreadsheet calculates an adjusted RVoe„eloped 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 D.00 0.00 0.02 • 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 0.25 mowed/managed CN 39 61 74 80 Area(acres) 0.00 ., z. .. 0,00' 0.00- . 0.23 - Impervious Cover CN 98 98 98 98 Weighted CN S 88 1.36 1 1-year storm 2-year storm 10-year storm RVDevotoped(in)with no Runoff Reduction 2,27 2,45 4,24 _ RVDeveloped(in)with Runoff Reduction A, 1,90 2.08 3.87 Adjusted CN 83 84 84 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 O,Dti,- 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) D.00 0.00 0.00 0.00 CN 98 98 98 98 Weighted CN S 0 1000.00, 1-year storm 2-year storm 10-year storm RVDev,moped(in)with no Runoff Reduction . 0.00 ','; " ' 0.00 `';:, , : _ 0,00.- RVDevebped(in)with Runoff Reduction ;. .-0.00• 0,00. 0.00 W Adjusted CN #N/A #NIA #N/A 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 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 RVDeVemped(in)with no Runoff Reduction ',0;00 •0,00 0,00 RVDe„eioped(in)with Runoff Reduction 0.00` 0.00 0,001 Adjusted CN #N/A #N/A #N/A 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 D.00 0.00 mowed/managed CN 39 61 7480 Area(acres) 0.00 0,00 0.00 f 0.00 Impervious Cover CN 98 98 98 98 Weighted CN S 0 - 1000.00 1-year storm 2-year storm 10-year storm RVDe„eloped(in)with no Runoff Reduction " `0.00 , 0.00 0.00 RVDeveloped(in)with Runoff Reduction • 0.00 • 0.00 0.00 Adjusted CN #N/A #N/A #N/A 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 I 30 55 70 77 Virginia Runoff Reduction Method Worksheet Virginia Runoff Reduction Method ReDevelopment Worksheet v2.8 Revised April 2011 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 0.02 0.02 4.00 Turf(acres) 0.00 0.00 0.00 0.25 0.25 50.00 Impervious(acres) 0.00 0.00 0.00 0.23 0.23 46.00 0.50 100.00 Site Rv 0.56 Post Development Treatment Volume(ft3) 1024 Post Development TP Load(Ib/yr) 0.64 Post Development TN Load(Ib/yr) 4.60 Total TP Load Reduction Required(Ib/yr) 0.45 Total Runoff Volume Reduction(ft3) 671 Total TP Load Reduction Achieved(Ib/yr) 0 Total TN Load Reduction Achieved(Ib/yr) 3.46 Adjusted Post Development TP Load(lb/yr) 0.17 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) 0.02 0.00 0.00 0.00 0.00 0.02 Turf(acres) 0.25 0.00 0.00 0.00 0.00 0.25 Impervious(acres) 0.23 0.00 0.00 0.00 0.00 0.23 0.50 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) 0.47 0.00 0.00_ 0.00 0.00 0.47 TN Load Red.(Ib/yr) 3.46 0.00 0.00 0.00 0.00 3.46 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 0.02 0.02 4.00 Turf(acres) 0.00 0.00 0.00 0.25 0.25 50.00 Impervious(acres) 0.00 0.00 0.00 0.23 0.23 46.00 0.50 BMP Selections Practice Credit Area(acres) Downstream Practice 6.b.Bioretention#2(Spec#9) Impervious: 0.23 Turf(Pervious): 0.05 Total Impervious Cover Treated(acres) 0.23 Total Turf Area Treated(acres) 0.05 Total TP Load Reduction Achieved in D.A.A(1b/yr) 0.47 Total TN Load Reduction Achieved in D.A.A(Ib/yr) 3.46 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 88 83 84 84 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 UN/A D.A.E CN 0 #N/A #N/A UN/A Summary Print