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HomeMy WebLinkAboutWPO202100022 Calculations 2021-04-27Southwood Redevelopment — Blocks 11&12 ALBEMARLE COUNTY, VIRGINIA WPO PLAN DESIGN CALCULATIONS & NARRATIVE APRIL 12, 2021 TIMMONS GROUP YOUR VISION ACHIEVED THROUGH OURS. Prepared by: Bryan Cichocki, PE Timmons Group 608 Preston Avenue, Suite 200 Charlottesville, VA 22903 434.327.5380 Table of Contents Section Title 1. Project Narrative 2. LD-204 Inlet Calculations 3. LD-229 Pipe Calculations 4. LD-347 Hydraulic Grade Line Analysis 5. Virginia Runoff Reduction Method Worksheet Summary Project Narrative: This project includes the construction of one private road, three apartment buildings, and associated parking, utilities, and landscaping. The limits of disturbance is 4.16 acres. Water Ouality: The current site is undeveloped. 4.16 total acres were analyzed for water quality, which was further broken down into Blocks 11 and 12. Block 11: In the existing condition, block 11 is made up of 1.34 acres of managed turf. In the proposed condition, the landcovers will be 0.47 acres of managed turf and 0.87 acres of impervious cover. The total TP load reduction required is 1.55 lbs/year. 0.61 Ibs/year will be treated by a level 2 bioretention facility. The remaining 0.94 lbs/yr of required nutrient credits area shall be purchased from a DEQ-Approved Nutrient Credit Bank in Accordance with VA code 62.1-44.15:35. Block 12: In the existing condition, block 12 is made up of 2.82 acres of managed turf. In the proposed condition, the landcovers will be 0.85 acres of managed turf and 1.97 acres of impervious cover. The total TP load reduction required is 3.50 lbs/year. 2.74 lbs/year will be treated by a combination of a level 2 bioretention facility, a manufactured filtering device, and a manufactured hydrodynamic device. The remaining 0.76 lbs/yr of required nutrient credits area shall be purchased from a DEQ-Approved Nutrient Credit Bank in Accordance with VA code 62.1-44.15:35. Water Quantity Water quantity requirements for this site will be met through a stormwater pond constructed per WPO201900062. No additional stormwater quantity measures are proposed with this plan. FORM LO 201 STORMWATER INLET COMPUTATIONS SHEET 1 OF ROUTE PROJECT Sarm o B 11 DESIGNER: KAM DATE N12DOZI CHECKED: UNITSAGUSH INLETSOFT BY ENSOFTEC DATE: v1mul FORM L0201 STORMWATER INLET COMPUTATIONS SHEET 1 OF ROUTE PROJECT $pillwOM Bbt*12 DESIGNER: KAM DATE N12DOZI CHECKED: UNITSAGUSH ��m�mmm0000mmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmomommmmmmmmmmmmmmmmmmmmm��m mmm�mmmmmmmmmmmmmmmmmmmm®mmmmmmm�mtm� ®mm�mmm0000mmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mm�mmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmomom�mmmmmmm®mmmmmmmmmmm��m mmm�mmmmmmmm�mmmmmmmmmmm®mmmmmm®mtmtm� �mm�mmm0000mmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmomom�mmmmm�m®mmmmmmmmmmm��m mmm�mmmmmmmm�mmmmmmmmmmmommmmmmmmt�m� mmm�mmm0000mmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mmm®omom�mmmmm�m®mmmmmmmmmmm��m mmm�mmmmmmmm�mmmmmmmmmmmammmmmm®mt�m� mmm�mmm0000mmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmomom�mmmmmmm®mmmmmmmmmmm��m mmm�mmmmmmmm�mmmmmmmmmmmommmmmm®mmtm� m�m�mmm0000mmmmmmmmmmmmmmmmmmmmm��m mmm�m®mmmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmomommmmmmmmmmmmmmmmmmmmm��m mmm�mmmmmmmmmmmmmmmmmmmmommmmmmm�®mom ®mm�mmmmmmmmmmmmmmmmmmmmmmmmmmmm��m� mmm�mmmmomom��mmmm�m®mmmm®mmmmmm��m� ®mm�mmm0000mmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mm�mmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmomom�mmm�®gym®mmmmmmmmmmm��m mmm�mmmmmmm®�mmmmmmmmmmmommmmmm®mt�m� ��m�mmm0000mmmmmmmmmmmmmmmmmmmmm��m mmm�m®�mmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmo�ommmmmmmmmmmmmmmmmmmmm��m mmm�mmmmmmm®mmmmmmmmmmmmomm�mmmm�mtm� ��m�mmm0000mmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmomommmmmmmmmmmmmmmmmmmmm��m INLET$OFT BY EN$OFTEC DATE:VlMU21 FORM L0201 STORMWATER INLET COMPUTATIONS $HEEf2OF2 ROUTE PROJECT 12 DESIGNER: KAM DATE wi=I21 CHECKED: UNITSAGUSH INLET q F Sa Inpb Onl I E66 00]I 20'.p 165f 29'R T>BOfl INLEI$OFT RY EN$OFTEC DATE: v1mul PHA Block 77 Storm STORM SEWER DESIGN COMPUTATIONS STORM FREQUENCY 70 PROJECT: LOCATION: COUNTY: Designed by: Checked by: UNITS ENGLISH PIPE NO FROM POMT TO POINT DRAM. AREA "A" Acre (3) RUNOFF COEFF, "C" (A) CA TOTAL INLET TIME Minutes (9) RAM FALL inH (8) RUNOFF Q CPS (9) INVERTELEVATIONS LENGTH of Pipe Ft (12) SLOPE Ft/Ft. (13) SIZE (Dia. Or SpaNRise) In. (N) SHAPE Capacity CPS (15) Friction Slope FUFI. VEL V. PUS. (16) FLAW UME Min. (19) REMARKS (18) MCRE-ACCUM- MENT (5) ULATED (6) ADDTL CA UPPER END (10) LOWER END (11) REFERENCE (1) STA. REFERENCE (2) STA. 203 2M 202 0000 0000 000E 0.333 0333 600E 6.160 2051 474363 470.M2 $0018 0050 12000 Circular 862] 0003 9024 0148 Area&a. RD1 205 206 202 0"0 0900 0308 0.308 0000 600E 6.160 1SW 469935 a69920 42974 0005 12000 Circular 2728 0002 3962 0.190 201 202 200 0310 0-610 0199 0-830 0000 6.195 6136 5-093 6902d0 469-619 12a61 0-050 12000 Circular 8&629 0019 11465 0018 PHA BLOCK 12 STORM STORM SEWER DESIGN COMPUTATIONS STORM FREQUENCY 70 PROJECT: LOCATION: COUNTY: Designed by: Checked by: UNITS ENGLISH PIPE NO FROM POINT TO POINT DRAM. AREA "A" Acre (3) RUNOFF COEFF, "C" (4) CA TOTAL INLET TIME Minutes (]) RAM FALL InO (8) RUNOFF Q CPS (9) INVERTELEVATIONS LENGTH of Pipe Ft (12) SLOPE Ft/Ft. (13) SIZE (Dia. Or SpaNRise) In. (14) SHAPE Capacity CPS (15) PHNion Slope FUFI. VEL V. FI/S. (16) FLAW TIME Min (19) REMARKS (18) INCRE-ACCUM- MENT (5) ULATED (6) ADDTL CA UPPER END (10) LOWER END (11) REFERENCE (I) STA. REFERENCE (2) STA. 119 120 118 0. 140 0350 0049 0049 ONO 60M 6.IW 03M 488058 487250 $0774 0010 12W0 Circular 3.858 0000 2.929 0460 117C 118 lim 0000 00W DOW 0.355 0.306 6474 6064 2.153 486724 486.480 48719 0005 12 NO Circular 2728 0003 3.859 0210 Area Qom RD1 117A Ilm 116 0430 0820 0353 0708 0000 6695 6016 44257 486383 486.310 16.563 0005 15 W0 Circular 4.947 0004 4.545 0053 127 128 116 0.560 0740 0414 0414 0000 60W 6.IW 2553 486.66] 486.310 25.158 0005 15 W0 Circular 5.159 0001 4203. 0.100 115 1 116 1 114 OOW 0000 1 0000 1.122 0000 1 6750 59W 6723 486211 485700 102237 1 0005 1 18 NO Circular 8041 1 0003 1 5.10] 0.334 113 114 112 0000 DOW ODW 1392 0110 7093 5920 8241 485603 485430 36.6]] 0-005 21 WO Circular 12136 0002 5436 0106 AmafromRD2 111 112 110 0000 OOW OOW 1.392 0.000 72M 5920 8241 485330 484.960 76039 0005 21 NO Circular 12.136 0002 5436 0229 IW 110 108 0_180 0770 0139 1531 0000 7437 5920 9.061 684$55 484.690 33080 0.005 21 NO Circular 12136 0003 5545 0099 125 126 108 0.150 0.350 0-053 0-053 0000 60W 61W 0323 4874% 486958 36190 D_020 12W0 Circular 5457 0000 3816 0.161 IN 108 106 0000 DOW OOW 1.583 OA00 ]540 5920 9392 684588 4M 500 17519 0005 21 NO Circular 12.136 0003 5.582 0052 123 124 IN 0.160 07W 0.126 0.126 0.000 60W 6.IW 0i 485812 485.383 42933 0010 12 NO Circular 3.858 0000 3.SM 0.186 105 106 1IN 0000 OOW OOW 1210 0.000 ]5% 5920 10. 120 48,1404 484.150 50253 0005 21 NO Circular 12.136 0003 5660 0. 149 IN 1M 103 0210 0690 0145 1854 0000 ]9d9 5920 10-978 4M 051 483060 198 IM 0005 21 NO Circular 12136 0004 5728 05n IN 103 102 0000 OOW OOW 1.854 0.000 8342 5920 10.978 482963 482.570 ]8.506 0005 21 NO Circular 12.136 0004 5728 0228 121 122 102 0010 09W OOW 0009 0.000 OOW 5920 0053 486900 486.230 33.505 0020 12W0 Circular 545] 0000 2219 0252 101 102 IN 0030 0M 0023 1.SV O.OW 8S]B 5920 11.168 482.4]0 482.310 36.1d5 OWS 21000 Circular IU63 0004 5.580 0.102 PHA Black 11 Stofm PROJECT: DESIGNED BY: HYDRAULIC GRADE LINE ANALYSIS Checked: INCIDENCE PROBABILITY 10 Year INLET OR JUNCTION INLET STATION OUTLET WATER SURFACE EtE DIA PIPE Do (In) DESIGN DISCH. Go (CFS) LENGTH PIPE Lo (ED FRICTION SLOPE, SW (FT/M FRICTION LOSS Hf (ED JUNCTION LOSS I FINAL H (Ft) I Inlet Waled SuU EI¢vatlm RM Ek Coom V. Ho (ED OI N OM M-2r4 HI Ante HA HI 1S HI S5 HI 202 470.42 12 5.09 12.46 1.74% 0.22 11.46 0.51 2.05 9.02 18.51 1.26 0.44 9.15 0.16 1.12 1.45 TRUE 0.94 471.36 475.22 OK -3.86 204 471.36 12 2.05 $0.02 0.28% 0.23 9.02 0.32 0 0 0 0 0 0 0 0.32 0 TRUE 0.38 471.74 478.54 OK -6.8 206 471.36 12 1.9 42.97 0.24% 0.1 3.76 0.05 1 0 0 0 0 0 0 0 0.05 0.07 FALSE 0.18 471.54 475.85 OK 4.31 PHA BLOCK 12 STORM PROJECT: DESIGNED BY: HYDRAULIC GRADE LINE ANALYSIS Checked: INCIDENCE PROBABILITY 10 Year INLET OR JUNCTION INLET STATION OUTLET WATER SURFACE EIEV. DIA PIPE Do (In) DESIGN DISCH. Go (CFS) LENGTH PIPE LO (ED FRICTION SLOPE, St (FT/M FRICTION LOSS Hf (ED JUNCTION LOSS FINAL H (Ft) Ioet Waled SuU E1.11. RM Ek COnm¢nl Vo Ho (Ft) pl N DM N'32g HI Ante HA HI IS HI SE HI 102 483.71 21 11.17 34.14 0.42% 0.14 5.58 0.12 10.98 5.73 62.88 0.51 0.18 14.83 0.1 0.4 0 TRUE 0.34 484.05 493.27 OK -9.22 103 484.05 21 10.98 78.5 0.41% 0.32 5.73 0.13 10.98 5.73 62.88 0.51 0.18 13.42 0.1 0.4 0 TRUE 0.52 484.57 493.04 OK -8.46 104 484.57 21 10.98 198.16 0.41% 0.81 5.73 0.13 10.12 5.66 57.28 0.5 0.17 3.36 0 0.3 0 TRUE 0.96 485.54 491.37 OK -5.84 106 485.55 21 10.12 50.75 0.35% 0.18 5.66 0.12 9.37 5.58 52.31 0.48 0.17 90.99 0.34 0.63 0 TRUE 0.49 486.04 491.31 OK -5.27 108 486.04 21 9.37 17.52 0.30% 0.05 5.58 0.12 9.06 5.54 50.24 0.48 0.17 90.36 0.33 0.62 0 TRUE 0.36 486.41 492.04 OK -5.63 110 486.41 21 9.06 33.08 0.28% 0.09 5.54 0.12 8.24 5.44 44.79 0.45 0.16 91.33 0.32 0.6 0 TRUE 0.39 486.8 491.91 OK -5.11 112 486.8 21 8.24 74.04 0.23% 0.17 5.44 0.11 8.24 5.44 44.79 0.46 0.16 91.41 0.32 0.6 0 TRUE 0.47 487.27 492.76 OK -5.49 114 487.7 21 8.24 34.68 0.23% 0.08 5.44 0.11 6.72 5.11 34.33 0.4 0.14 39.76 0.17 0.43 0 TRUE 0.3 487.56 492.91 OK -5.34 116 487.56 18 6.T2 102.24 0.35% 0.36 5.11 0.1 4.26 4.55 19.35 0.32 0.11 96.91 0.19 0.41 0 TRUE 0.56 488.12 491.66 OK -3.54 117B 488.12 15 4.26 14.56 0.3T% 0.05 4.55 0.08 2.15 3.86 8.31 0.23 0.08 4.02 0 0.16 0.21 TRUE 0.16 488.28 490.62 OK -2.34 118 488.28 12 2.15 48.72 0.31% 0.15 3.86 0.06 0.3 2.93 0.88 0.13 0.05 63.38 0.07 0.18 0 TRUE 0.24 488.52 491.83 OK -3.31 120 488.52 12 0.3 $0.77 0.01% 0 2.93 0.03 0 0 0 0 0 0 0 0.03 0.04 TRUE 0.03 488.55 492.21 OK -3.66 122 487.03 12 0.05 33.51 0.00% 0 2.22 0.02 0 0 0 0 0 0 0 0.02 0.02 TRUE 0.01 487.04 493.09 OK -6.04 124 486.18 12 0.78 42.93 0.D4% 0.02 3.85 0.06 0 0 0 0 0 0 0 0.06 0.07 TRUE 0.05 486.24 490.69 OK 4.45 126 487.56 12 0.32 36.79 0.01% 0 3.82 0.D6 0 0 0 0 0 0 0 0.06 0.07 TRUE 0.D4 487.6 492.05 OK - 5 128 488.12 15 2.55 25.16 0.13% 0.03 4.2 0.07 0 0 0 0 0 0 0 0.07 0.09 TRUE 0.12 488.24 489.83 OK -1.59 �QO_�0�� 0■�0� 000��o�©v�oo. ■-■�,-■1 Drainage Area A Drainage Area Aland Cover (acres) Total D.. Stormwater Best Management Practices (RR = Runoff Reduction) Total Phoommus Available for Renpval In D.A. A(Ib/yr) Baf Port Development Trcxment Volume In D.A. A(N) 1�3 —select from ampaown Ham — P!a[t [! Runoff Reduttlon CredN (%) ManyeG CredN Area(anes) Arco ImpeMws Cover CreeN Arco (acres) Volume term Runoff UP[Veam ReduNon(Na)RuroXValume prattle (f�) Remouns, (fta) Totl BMP Trea4rem Valume(Na) PMspM1mus Rennusl nndenry)%) XwspM1ws Wd Untreated floor Uprtream PW PpMm5 Wd prettlar (Ih) WPn[tlre (lb) Plnaphoms Rennued By Practice (Ih) Remaining pM1OSp(lb) Wad (lb) pow,nVeadered eWhe Employed z. Vegeuree nmlmlkea asl I,re- e. Venom. Was. per AD I, - - xa.vmgeokamnx,bn,eaesdh IkeapU x e vmge d ("Par mim to c/owe Ikeaq apemlon+a laavu a Wexeyx, (keaw) aearn aa1sma ael mu4 .lam nn lsoea In, cal, -n—sence aysm, am a All—tes H111uJ19lkea AD mn(5amem�Mpewenl ,. mmea a.amamm(waadn mea a a.anamaB(Seaapn ,. ,aai m.aladwenpadd) ,aai nnaltJowelYeam) D, Tampmtnmmdadwli o�Ican Raam) :.ndysnalemlYeamB) cn ",a) �! ab dark-deral.1-l6de,namla, net as n n nnnpeaul eaaassl =711Donfl= ."an Removal miclenry I%) XNmgen Wad from UPSbeam Practices(Ihs) U.d F!"an Wad to Prattlm(lbs) ."on Reversed By Practice(lbs) Remaining admgen Wad ran) cospi— .con, alls dllt s ,ea,aRSHHDO m lsce,.zle. - sn ,d. In se.. ,a )sP Q DO I'do ,eve nsdl R.,NnP,nSo a, �t e.e Mvosel. so a D D o D nm aDO Dm -do FM) TOTAL IMPERVIOUS COVER MATED )a[) D.}B AREACNECN: OK. TOTAL MMIAGED TURF AREA TREATED )a[) D.16 ARFACNEER: OR. TOTAL RUNOFF REDUCTION IN DA AIR') 8SS TOTAL PHOSPHORUS AVAILABLE FOR REMOVAL IN D.A. A)IH/y�) 0F3 TOTAL PHOSPHORUS REMOVED WRN RUNOFF REDUCTION PMRNES IN D.A. A)IR/y,) D.M TOTAL PHOSPHORUS REMAINING AMR APPLYING RUNOFF REDUCTION PRACRICES IN D.A. A HWr) OD) SEE WATER QUALITY COMPLMNCE TAB FOR SIT£ COMPLIANCE CALCULATIONS TOTALIMPERHOUSCOVERTREATED)ae) D.}B AREACNECK: OK. TOTAL MANAGED TURF AREA TREATED LIC) 0.16 AREACHECK: OK. TOTAL PHOSPHORUS REMOVAL REQUIRED ON SITE)IE/yn) LSS TOTAL PHOSPHORUS AVAILABLE FOR REMOVAL IN D.A. A)IL/yn) 06R TOTAL PHOSPHORUS REMOVED WITHOUT RUNOFF REDUCTION PMCTICES IN D.A. A)I!/y,) GOO TOTAL PHOSPHORUS REMOVED WITH RUNOFF REOUCl10N PRACTICES N D.A.A)I!/to O61 TOTAL PHOSPHORUS LOADREDUCFION ACHIEVED IN DA A (I!/y,) O61 TOTAL PHOSPHORUS REMAINING AFTER APPLYING RMP MAD REDUCTIONS IN D.A. A) IL/r) D.N s. meemo. to FIUe,/Oven Sta[e HP) TOTAL RU NOFF REDUCTION IN D.A A(W) 865 MR-11.REMOVE. WRN RUNOFF REDUCTION PMEIICES INDA.AjIb/r)j 647 SEE WATER QUALIFY COMPLMNCE Ml FOR 511E GECUTATIONS H foimolion Only) IS II. Wtt Ponds no RR) 14. N—Iseluretl RMP RR) )no SEE WATER QUALI" COMPLIANCE TAB FOR SITE COMPLIANCE CALCULATIONS NITROGEN REMWED WRN RUN.lF REDUC]IOX PMCMES IX D.P. PLIL/yII AO] NITROGEN REMWED WLINDUT RUN., REDUC]IOX PMClICE51N D.P. RLIR/yA AT TOTRL NITROGEN REMOVED IN D.R. R(IN/W) AO] Site ulta(Water Quality Compliance) Area LM1x am lay wen lay n uyyMe or aMa TwaMwitt VMumelR°I '�[ RunoR MJuaim Volume and TP By P'aWRe Area m lx'I wm ONnI ne l�xMl u%u l�xMl TotalP Ihlns mao0Yn1 am ONnI reenOYnl- em l�xMt Total MWogan lau lrl rm4un Puryme[I m lVvrl tno l�xMl mm ObM Virginia Ruiner Recursion Method Workshest DEC, Virginia Runoff Reduction Method Re -Development Compliance Spreadsheet - Version 3.0 BMP Design Specifications List: 2013 Droll Stds & Specs Site Summary Project Title: Southwood - Block 11 Date: 44298 Total Rainfall (in): 43 Total Disturbed Acreage: 1.34 Site Land Cover Summary Pre-ReDevelopment Land Cover (acres) Asoils BSolls CSolls DSolis Totals %of Total Forest/Open (acres) 0.00 0.00 0.00 0.00 coo 0 Managed Turf(acres) 0.00 1 1.34 0.00 0.00 1.34 100 Impervious Cover (acres) 0.00 0.00 0.00 0.00 coo 0 1.34 100 Post-ReDevelopment Land Cover (acres) Asoils BSolls Solis DSoils Totals %of Total Forest/Open (acres) 0.00 0.00 0.00 0.00 0.00 0 Manags) ed Turf(acres)1 0.00 0.47 0.00 0.00 0.47 35 Impervious cover (acres) 0.00 0.87 0.00 0.00 0.87 65 1.34 100 Site Tv and Land Cover Nutrient Loads Final Port -Development Post- poll - Adjusted Pre- (Post-ReDevelopment ReDevelopm¢m Developmentrvlous ReDevelopment &New Impervious) ) (New lmpervlous) Site Rv 0.69 0.20 0.95 0.20 Treatment Volume(ft) 3,341 341 3,000 341 TP Load(lb/yr) 2.10 0.21 1.89 0.21 Baseline TP Load(lb/yr): 0.1927- 'Reduction below new development road limitation not required Total TP Load Reduction Required (lb/yr) 1.55 0.02 1.53 Final Post-Developmem Load (Post-ReDevelopment & New Impervious) Pre- ReDevelopment TN Load (Ib/yr) 15.02 4.37 Pre- ReDevelopment Final Post -Development Post-ReDevelopment TP TP Load per acre TP Load per acre Load per acre (lb/acre/yr) (lb/acre/yr) (lb/acre/yr) 0.46 1.57 0.46 Summary Print Virginia Runoff Reduction Method Woftheet Site Compliance Summary Maximum% Reduction Required Below m% 'Note:% Reduction will reduce post- development TP load to less than or equal to baseline load of0.19lb/yr(0.41 lb/ac/yr) Pre-ReDevelopment Loatl (Required reducdonfom Post-RCDay.=Post-ReDev TP load -baseline load of0.1927 lb/yr), baseline load=site area x 0.41 Ib/ac/yr Total Runoff Volume Reduction (k') 865 Total TP Load Reduction Achieved (lb/yr) 0.61 Total TN Load Reduction Achieved (lb/yr) 4.47 Remaining Post Development TP Load 1.49 (lb/yr) Remaining TP Load Reduction (Ib/yr) 0.94 Required 'Reduama below new development load limitation not required Summary Print Virginia Runoff Retlucfion Method Woftheet Drainage Area Summary DA. A D.A. B D.A. C D.A. D D.A. E Total Forest/Open (acres) 0.00 0.00 0.00 0.00 0.00 0.00 Managed Turf(acros) 0.16 0.00 0.00 0.00 0.00 0.16 Impervious Corer(acres) 0.28 0.00 0.00 0.00 0.00 0.28 Total Area (acres) 0.44 0.00 0.00 0.00 0.00 0.44 Drainage Area Compliance Summary DA. A D.A. B DA. C D.A. D D.A. E Total TP Load Reduced (lb/yr) 0.61 0.00 1 0.00 1 0.00 0.00 0.61 TN Load Reduced (lb/yr) 4.47 0.00 1 0.00 1 0.00 0.00 4.47 Summary Print Drainage Area A DralnaReAreaAWnd Cover (acres) lareampar ampare—laMn'.c., CAR Total 2.26 Stormwater Best Management Practices (RR = Runoff Reduction) Total PROVIerus,Wailable for Removal In D.A. A Batty) 39D Port Development Treatment Volume In DA A(W) 6E16 —select from ampaoem 1156— Plan [! Runoff Reduttlon CredN(%) Man,.d TurfCredN Arco (acres) ImpeMws CoverCredN Arco (acres) Volume from IlpsVeam Runoff ReduNon (Na) prounce w') RemalnRp RuroXValum, (Na) Totl BMP Trea4rem Valum,(ft) PMlh— n Renval Mcienryl%) MwspRws WG UnNeateO homllprtream lahmmorus Wd heatim ID) WPractice (lb) PMWh.rvs Renamed By Practice BID) Remaining PRospNoms Wad (Ib) downsfor—Pram,r,Aa Ne Employed z. Vegeureenm."Stea AD e. Vageu..A,)dace as) I, - - xa.vmgeokamnx,bn,eaesaN I"Doctm Ww x cvmgedie/oe (Zaa kaaq w Madnr+a laam aCSSe.dl(Star, ad) lm u4 a111, ml amp dc an (spar, Mel nykanl an1(kanl a All—te H111uJ19 Vraar c) mn(5aaea3�Mowm,nl ,. amea a.amamm(vam ,mea a P1111osaz(soa97) ,. ,aaa a..alaewenoaMsl ,ace. nndcrowe(zp,r,m) D, Tanproteeadadwla lase See., ,..C,Sealaarrspaacdyl s.mdysesis.rp,r,mn Be 0 So mar e.(:�.) _Ma,aa„e.11 mce-loan—un _ Is 111_ zBre a ,..1affilb,acen4.(wa,ae) llfl ulds,ag Spar, an Dmilosso ."an Removal EHcirms,(%) Vaal W. from UpS am Practices(Ibs) Il.d N"an Wad to Prattice(Ibs) ."on Rennved By Practice(lbs) Remaining Narogen Wad pas) -- Mlbkll151 5 rea,PlhStlh w �� Iscee ail ce Sn ra, T/o 1.0 lSpmaxlw vaFwaree Fire, p-n.n M,t, ., so a D D o D nm am Dm nm G, R, AMI TOTAL IMPERVIOUS COVER TREAT EOIa[) D.40 AREACNECN: OK. TOTAL MANAGED TURF AREAIREATEOIa[) D.16 ARFACNEER: OR. TOTAL RUNOFF REDUCTION IN DA A)Ra) E�]I6 TOTAL PHOSPHORUSAVAPULE FOR REMOVAIN D.A.A)M/yc) 390 TOTAL PHOSPHORUS REMOVED WRN RUNOFF REDUCTION PMCIICES IN D.A. A)IR/y,) t<] TOTAL PHOSPHORUS REMAINING AMR APPLYING RUNOFF REDUCTION PMCTCES IN D.A. A)IL/y,) 2G8 SEE WATER QUALITVCOMPLMNCE TAB FOBSITE COMVLIANCECALCUTATI0N5 TOTAL IMPERVIOUS CWER TREATED)ac) 1.69 AREA CHECK: OK. TOTAL MANAGED TURF AREA TREATED)ac) F O.SR AREACHECK: OK. TOTAL PHOSPHORUS REMOVAL REQUIRED ON SITE)IE/yc) 3.SO TOTAL PHOSPHORUS AVAIIRRLE FOR REMOVAL IN D.A. A)IL/yc) 39O TOTAL PHOSPHORUS REMWED WITHOUT RUNOFF REDUCTION PRACTICES IN D.A. A)I!/y,) L,- TOTAL PHOSPHORUS REMWEDWITH RUNOFF REOUCl10N PMCTICES ND.A.A)I!/y,) 1<E TOTAL PHOSPHORUS LOADREDUCFION ACHIEVED IN DA A R!/y,) ].]0 TOM PHOSPHORUS REMAINING AFTER APPLYING RMP MAD REDUCTIONS IN D.A. A) IL/yc) 1.16 9. SFeeHlowto FiHe,/Open Space (RR) TOTALRUNOFFREDUCFgNIND.AAIN°) 2ll6 NDRWEN RENEWEDWRN RUNOFF REDUCTION PMCTCES IN D.A. A) I!/y,) I II.M SEE WATER QUALIFYCOM.ULACE TAN IOU SITE CAECUTA TIONS H focmofion 0.1,) 25 77-- SEE WATER QUALI" COMPLIANCE TAB FOR SITE COMPLIANCE CALCULATIONS N TRWEN REMWED WRN RUN.lF REDUCiIOX PMCMES IX D.P. PLIL/yII 11M NTRWEN REMWED WLINDUT RUN., REDUCiIOX PMClICE51N D.P. A)IR/yA AT T LNITRO ENRENIWEDIND.A.A(IN/M) 11M Site ulta(Water Quality Compliance) Area LM1xks am lay w nlay nMe or uyyMe or aMa TwaMwitt VMumelR°I 7' [� MmP RunoR Juaim Volume and TP By immge Area nmlx'I I ul Iy e wm ONnI ne l�xMl u%u l�xMl TotalP Ihlns mao0Yn1 re am ONnI OY l- em l�xMt 0,76 Total MWogan lau lrl rm4un Puryme[I maolVvrl MO I�xMI mm ObM Virginia Ruiner Reduction Method Workshest DEC, Virginia Runoff Reduction Method Re -Development Compliance Spreadsheet - Version 3.0 BMP Design Specifications List: 2013 Droll Stds & Specs Site Summary Project Title: Southwood - Block 12 Date: 44298 Total Rainfall (in): 43 Total Disturbed Acreage: 2.82 Site Land Cover Summary Pre-ReDevelopment Land Cover (acres) Asoils BSolls [Soils DSolis Totals %of Total Forest/Open (acres) 0.00 0.00 0.00 0.00 0.00 0 Managed Turf(acres) 0.00 1 2.82 0.00 0.00 2.82 100 Impervious Cover (acres) 0.00 0.00 0.00 0.00 0.00 0 2.82 100 Post-ReDevelopment Land Cover (acres) Asoils BSoils CSGIls DSoils Totals %of Total Forest/Open (acres) 0.00 0.00 0.00 0.00 0.00 0 Managed Turf(acres) 1 0.00 0.85 0.00 0.00 0.85 30 Impervious Cover (acres) 1 0.00 1.97 0.00 0.00 1.97 70 2.82 100 Site Tv and Land Cover Nutrient Loads Final Port -Development Post- poll Adjusted Pre- (Post-ReDevelopment ReDevelopmem Developmentrvlous ReDevelopment &New Impervious) ) (New Impervious) Site Rv 0.72 0.20 0.95 0.20 Treatment Volume(ft) 7,411 617 6,794 617 TP Load(lb/yr) 4.66 0.39 4.27 0.39 Baseline TP Load(lb/yr): 0.3485- 'Reductionbelow new dewiopment road limitation not required Total TP Load Reduction Required (lb/yr) 3.50 0.04 3.46 Final Post-Developmem Load (Post-ReDevelopment & New Impervious) Pre- ReDevelopment TN Load (Ib/yr) 33.31 9.20 Pre- ReDevelopment Final Post -Development Post-ReDevelopment TP TP Load per acre TP Load per acre Load per acre (lb/acre/yr) (lb/acre/yr) (lb/acre/yr) 0.46 1.65 0.46 Summary Print Virginia Runoff Reduction Method Woftheet Site Compliance Summary Maximum% Reduction Required Below 20% 'Note:% Reduction will reduce post- development TP load to less than or equal to baseline load of0351b/yr(0.41 lb/ac/yr) Pre-ReDevelopment Loatl (Required reducdonfom Post-RCDay.=Post-ReDev TP load -baseline load of0.34R51b/yr), baseline load=site area x 0.41 lb/ac/yr Total Runoff Volume Reduction (kt) 2,216 Total TP Load Reduction Achieved (lb/yr) 2.74 Total TN Load Reduction Achieved (lb/yr) 11.44 Remaining Post Development TP Load 1.92 (lb/yr) Remaining TP Load Reduction (Ib/yr) 0.76 Required 'Reduama below new development load limitation not required Summary Print Virginia Runoff RecJalion Method Woftheet Drainage Area Summary D.A. A D.A. B D.A. C D.A. D D.A. E Total Forest/Open (acres) 0.00 0.00 0.00 0.00 0.00 0.00 Managed Turf(acros) 0.58 0.00 0.00 0.00 0.00 0.58 Impervious Corer(acres) 1.68 0.00 0.00 0.00 0.00 1.68 Total Area (acres) 2.26 0.00 0.00 0.00 0.00 2.26 Drainage Area Compliance Summary DA. A D.A. B DA. C D.A. D D.A. E Total TP Load Reduced (lb/yr) 2.74 0.00 1 0.00 1 0.00 0.00 2.74 TN Load Reduced (lb/yr) 11.44 0.00 1 0.00 1 0.00 0.00 11.44 Summary Print