Loading...
HomeMy WebLinkAboutWPO202100043 Stormwater Management Maintenance Agree. 2021-08-02SHIMP ENGINEERING, P.C. Design Focused Engineering July 30, 2021 Engineering Review Albemarle County Department of Community Development 401 McIntire Road Charlottesville, VA 22902 Regarding: WPO 2021xxxxx Crozet Animal Wellness Center VSMP — SWM Calculation Packet Dear Reviewer, Enclosed is the stormwater calculation packet for Crozet Animal Wellness Center. The development property has an area of 3.40 acres and a disturbed area of 0.98 acres. The project is a private development of a site. The proposed stormwater design meets water quality requirements set forth in 9VAC25-870-65 and water quantity requirements set forth in 9VAC25-870-66-B(3) and 9VAC25-870-66-C. SWM Quality SWM Quality is satisfied by providing required nutrient treatment for the development. 9VAC25-870-65 requires that the total phosphorous (TP) nutrient load created by the site development be treated in accordance with the VRRM Redevelopment Spreadsheet reduction requirements. To achieve nutrient treatment, two Stonntech underground storage systems will be provided which treat 0.72 lbs/yr of phosphorous. To meet the total treatment requirement of 1.29 lbs/yr of phosphorous removal, phosphorous credits will be purchased. This amount totals 0.57 lbs/yr phosphorous credits and satisfies the nutrient treatment requirement. Treatment Required Total Phosphorous) Treatment Provided Total Phos horous 1.29lb/yr 1.29lb/yr SWM Quantity SWM Quantity is satisfied by analyzing concentrated runoff from the development at 2 Points Of Analysis (POAs) within a channel downstream of the development property. 9VAC25-870-66-B(3) requires that concentrated runoff from development at each POA meet the energy balance equation. To achieve this, most concentrated runoff from the site will be routed two Stormtech underground storage systems which then discharge to POA 1. The remaining runoff is minimal and flows to POA 2 as sheet flow. The runoff to both POAs meets the energy balance equation. 9VAC25-870-66-C requires that the post-dev 10-year runoff at the POAs not exceed the pre-dev 10-yr runoff. This condition has also been satisfied. See table below for summary. 912 E. High Sr. Charlottesville, VA 22902 1434.227.5140 1 shimp-engineering.com POA1&2 Pre-dev Peak Runoff Max. Allowed Peak Runoff Post-dev Peak Runoff 1-Yr 1.75 cfs 0.78 cfs 0.72 cfs 10-Yr 6.46 cfs 6.46 cfs 5.84 cfs If you have any questions about this calculation packet please do not hesitate to contact me at: chris ashimp- engineering com or by phone at 434-299-9843. Regards, Chris Marshall, EIT Shimp Engineering, PC Contents: Water Quality Calculations: Pre-Dev VRRM Land Cover Map Post-Dev VRRM Land Cover Map VRRM Redevelopment Spreadsheet Water Quantity Calculations: Pre-Dev POA Drainage Map Post-Dev POA Drainage Map Energy Balance Equation TOC Calculations Predev HydroCAD Report Postdev HydroCAD Report Outlet Drainage Protection Spreadsheet Independent Reports: NOAA Precipitation Report Excerpt from NRCS Soils Report CROZET ANIMAL WELLNESS CENTER PREDEV VRRM MAP �'.`,�".•.`. �/'.�`'t.•.`. °a°a°a°a°a°aria' \ �''� � >'�' ;.'-' MANAGED TURF �•` E�l Or' �s5 *Opp CUUC UUCtC`S / l t.'.'�.•. / �• �������� aaa IMPERVIOUS �. �. .�(. ,�/ / / /// / ' % aaaaaaaa as � ./• � / aaaaaaaa aaaaaaaaaa / � \ \ \\\\ TMP 56-11 COUNTY OF ALBEMARLE DB 3830 PG 168 DB 1671 PG 603 PLAT DB 367 PG 155 PLAT ZONE: R2 RESIDENTIAL USE: FOREST 551 AC 40 Scale: ho FA TMP 56A2-01--6 R&H PARTNERS, LLC DB 4024 PG 567 DB 4079 PG 391 PLAT DB 367 PG 155 PLAT DB 255 PG 175 DESC. ZONE: R2 RESIDENTIAL USE: SINGLE FAMILY RESIDENTIAL 8.08 AC N DISTURBED AREA: 0.98 AC HSG B AREA: 0.98 AC TURF: 0.70 AC IMPERVIOUS: 0.28 AC I I 0 40 80 120 CROZET ANIMAL WELLNESS CENTER POSTDEV VRRM MAP ` I E-ROUTE ENGINEERED \ \ HANNEL PER DETAIL \\ ` 5 . N� MA AGED TURF 8� .. ..�li-iffffft ^`.sss. +!f •lam ■lY+,riafr.f rf aaprs s-fafr�o,fssf .f�'' T A r�i i i oni 1 ri �\arts s+ri i /iYs "� ti ati rtiiYrtr UP y� i i r��rtsr rswtrtEr�iirt�tii : t ♦ ` � / . f f■\� f a f f■ .it r if•. • ar z. Af Tf: r f f f s s s f 4a. s f f f f .�' �i i i i i r t \� � is • t�rto rts'i� rat r�y., � � . t " � tststsrr#s��rstsi i i i i I `ri'� / /.. LfTr.� • ■ ar�.iif f f ■'f a f y ■ ■f.ar� . � f f f f v\t sss �. 'i� J •3rstta t:�}sfsst io Y� ..n.; �s.ars xis - �.�.�.�r rw�rss r♦♦ �� �.ttttt,y.,###ts.�o• ��J',ttttr+:Y:�,#�#rt Y.�'Y tT�t(a '��„##+#tt / ■ffia■ri Diiiiii'Yi fd�fffsftYz.iiis/iff tffafa �.iif ii. rtttttnr �rsx wy'i Tr w.ti sftiss #r ssxrXtttrrr w,,rsssswtq t. ♦ttt \�'######�{fr ♦tr trst#######t n! #x#]�a t♦?tf#nb##. .t / ■flat■ f.`isfsss-.s .ffnfr a"T*Y ?t rc xii s"c+r. .sfsS�s ..I ttrt� ssss. i, rtt. t.>+x sriss s�i ,�r .�4 rtris rs rsss.n II ♦tt.at4 t,,;3tt##tt+t #t..itr ":'i(t t.,ttt�`tl rail:j:tt r`U"####. -+ . afffff.ti�iof: of ns ss»ffff.;;sf xffrasL.,fj, �'ffs.'sss"Paa sssf f' 1 . �,, •i t i rt fr#stst•.i,3`s�str s s s strti ti �aran� t � t rCTi is d � .'tsts#s#�a'i #y#it t*tsi n ■ffs s;�'�'"='�'f ssfffifffaa. 'fits#affffff �lysssf r�n� \�� • .. w y` amA L• ris r .. r .. i� r , -• w r..... w r e\aj's s,.. Gi� . a � �I Jrr�ri r. -.- tNtr�+r rirt ?r Yrt rx/ \\' ri�tttL'lirttttti. " ttr �tt rtt�Ytt�'r##'.. ■ffif•iffffffnffffffr. - a�-'1 fffffgf• �uiin> \.., arsr rrt.tttttttttanttr-i•tr. ss ssf�tr. ,rsssr t t , � � � t'a ttt . � � � � tt.�; � � � � � � � ttatitf v ■ ■ ati s a r �xZ#:#itrti Ott x�f ■ �©,tea. rttntttttttssrst.tsss rrsssasrs.tt.....:� .� �_-_,ttrtrttttttttttttttt. ♦tttttt ag,' tttttt. ®/ d ._`� ' • f f a f f f f■ f,,^i n f f i f f f f r�s f■ ■.� _.. f x Rag,' f f f f f f f f■ ,: .. '•�� ttl rtttxr rrttl t. r. �>Lktt�-`r,�ttt...tttt� f♦ Vet ♦. t t t t l♦ ♦t t/ t♦ ttit „♦ ♦ \♦ t t t t t t •� I. r i r t t t t t 1 t t N. Y.♦ w Y r rq LIs" PARTNERS, �• atttnt tr ♦tnftIDS 4024 PC LLC IDS 255 PC 175 DEED, ZONE: R2 RESIDENTIAL USE: SINGLE FAMILY RESIDENTIAL 8,08 AD I i DISTURBED • •: AC COUNTY OF ALBEMARLE • • 0.61 AC .: 3830 . ' .: .PLATUSE : FOREST V I / ©� Scale: I" ■ ■ ■ ■ ■ ■ L[DPB9BYOBa flBemrObn MetBol DeveAWwnr Lamp&n Spreatlshaet-Veryon3.0 2011 BMP Standard[ and SPeLBILatlons a W13 Draft BMP 3faMSEs add sil"Hkatlom Pmlem Nam 1te Qmmd Animal Wellness Cenr Datle Its te: 1 ]/33/=l mstammlues ldd nD [yn spe[ihman-On: 2013 Draft Sttls& Spen eal[ulaion alB Site Information Post -Development Project (Treatment Volume and Loads) r Ixmal Aral[ Baal[ Leal[ OSoils �..VOlaa cealaaal-a mrVece Ow un lanlMmweq/mn ].I6 e LI6 m mmavmr la -ay O20 oTo ] B6 Constants mllllnmesl A3 mllnmerl LCO TnalP ph ureliPlTI EM[lmy4 016 gen l 11l1MClmyll LB6 an=r PlMl oat pun aaetl o3o I I Pa¢t/lxai6Pam Laeerbaer) I Drr I % am O Mmegetl TURLoeerlaverl LI6 Wak"and MlNrq 6l0 %MaagMTul bt% ImpMuu Loralauesl 0.70 laf ama�al Ass xlmperviaia ffi% 6Be Areatwa) >u lira O NMri.M[1. saD F.,aaranpan Span, Tsm —Value o.maB lam-rtl Vryinh Runoff Relutbn MMOE... DEq VIMInla Runoff Reduction MMIIod Nei, Development Compliance Spreadsheet - Version 3.0 BMPDe,,rs r'if.mrmo ist M Dmft Stab BSpecs Site Summary project Tme: Ceram Animal wellness Center Done: "359 Site land Causer Summary A is nth Csn ni-I. L ds %aTual Sored/apen laves) 0.00 0.00 O.tll D.CD D.CD D Managed Turf(aves) O.OD 1 US 1 0.00 D.CO 1 US 62 Impervious Cover (acres) O.OD I 0.ro I moo 0.00 I 0.ro 3B 06 100 Site TV and land Corer Nutrient toads Re in OAg Tambour, Volume 3262 m Wad llbMl 2.05 Tx toad Ib 14.E6 Total Tload Reduction RequirN llb/yr) 1.29 Site Compliance Summary Total Runoff Volume Reduction(W) 0 Total TP load Reduction AtlOeaea(Ni 0.72 Total TN Into Reduction Renewed (mM) 0.00 Remaining ft.DeMopmewt TP bad 1.33 b/yr) Remaining To Wad Reduction QbMI 0.57 Required Omi ee Area Sum DA.A DAB DAC DAD DAE TWI Porest/open lave&j 0.00 now 0.00 DOD DOD non Manages Turf(aves) 0.e6 0.14 0.33 on DOD 116 Impervious Cnver(aves) 0.2S 0.45 0.00 ban DOD Dro Total Area (acres) a.n AN 033 An AM 2X Drainage Area Compliance Summary a.A.A D.A.R DAC DAD DAE Total TP bad Reduced(Ib/yr) 0.30 001 0.00 DOD DOD 0.72 TR bad Reduced pb/p) am 6,M 0.00 ban ban 0.00 Drainage Area A Summary bna Cover Summare Abns BSuls CSmis DScils Total %&T.1 bred/Chmn lades) am o.Do 0.00 o.Do oa o Managed Turf (acres) am o.C6 Doo Doo 0.46 65 Impervious Cover(avesl 0.01) 0.25 0.00 o.Co 0.25 35 RMV Selection& Managed Turf impervinus TPtova won Dawn&team BMPTreaerimm unt¢aka TP toad TV Remavea TP Remainme practice treait Area over CrNi[ VolumelR') DPstream lnhactice llbx) Ilb/YQ )Ib/yr) Treatment to be Area a prac0¢s Ibs employed M.b.Manufaciurea Treatment Device- 0.059 0.232 X202.26 0.00 0.23 0.30 o.GS filtenn Total Impervious Cover Trome!(acres) CIS Tonal Turf A¢aTeatealacres) 0.06 Total TP bad Reduction Achieved in D.A. b/ r am Total Tel Lwtl Reduction Achieved in D.A. b/ r noes Drainage Area B Summer, bnn Career summary AbOs Bsuls Csmis OSoils Total %&T.1 Poretl/apen(acres) 0.00 o.Co D.00 D.aO D.aO D Mam6eanrf(iives) 1 0.00 1 o.14 1 Don I D.DD 1 D.14 24 Impervious Cpver(aces) I am I o.AS I Doo I Don I D.AS 76 I a.s9 I BMPSelerbom Sunrrery RM Vryinh Runoff Reluct n Marred WorksRH ManaRa Turt ImperviousedctAn—Cr TPL¢aFmm Downstream RaaOae tr(aires) fnso(do i[ uMPTrealmen[ Opstream OntreaRa TP L¢a TP Remained TP Remaining TreaMentto be Nea dares Volume)fl') praati¢s Ibs bRacOce )Ibs) Ilb/yQ (Ib/yrl Fm I a 10.b.Manu(aRurea Treatmem0evice- O.1CC O.009 tdff g. 0.00 IAM OA1 0.62 Blterin Totallmpervious Cover Tmatetllacresl OAS Total Turt Area Treated(acres) 0.16 u ion mve .n )Ib/Yrl a ......... 0.01 airs w action ieve �n )Ib/Yr� 0.00 Drainage Area C Summary land Comer Summary ASAN BWN C3ops OUR, Total %pfTpbl Forest/open (a—) 0.00 0.00 0.W I am 0.W 0 Managed Turt(aues) 0.00 0.33 I 0.W I m 1 0.33 DID Impervious Corer (amc) 0.00 ROD I 0.W I m I 0.00 0 BMP Selections 03 Managa Turt I Impervious TP Wad lmm Downstream BMPTrealmen[ Drnt —red TP Lwa TP Remained TP Remaining Praatiee treait Brea fn¢r[rNi[ Opstream TreaMent W be Area xres Volume)fl') RacO¢s Ibs °Ractice )Ibsl Ilb/yQ )Ib/yrl em to d TOUI Impen ions Cover Tmated (acrea) 0.00 ioUl Turt Nea Trtatetl banes) 0.00 )Ib/YQ a e u ion mve m O00 )Ib/Yrl 11 w u mn ieve m R Drainage Area D Summary land Cover Summary R Soils BSoils CSoils DSoils Taral %afTOCI farest/Open)anes) 0OD O.CO 0.03 O.CO O.CO 0 Mawgea Turf acres) ROD R23 ROD D.CO R23 100 Impervious Cover)anes) I O.OD I O.CO I O.M I O.CO I RM D BMP Selections 0.23 Managetl Turt Impervious OMIT—ment TP Lwa from Ontreaha TP Lwa -Removes -Remaining Downstream RacOce Uetlit Area Cnver CrNit Opstream Treabnenttobe Rrea a Volume(fl') ..-e Ibs to RacOce)Ibs) Ilb/yQ )Ib/,) e.pl,d Totallmpervious CoverTreatetl(acres) 000 Total Turt Area Treated(acres) 000 Total - Load Reduction Achieves in D.A. am b r Total Tel lwtl Reduction Achie cea in D.A. b/ r am 1- ear storm1 2- rs.— 10. arstorm target Rainfall esem)in) 1 3.07 1 3.71 5.50 Drainage Areas RVSCee Drainage AreaA Drainage Areall Drainage ArwC Oniwge MwO Drainage Areal m ]0 is 61 61 0 Rp p 0 0 0 0 0 1-rear serum period aM baainl Rs9 1% 039 039 O. FUR M++O Mm 196 039 039 0. w adwraa Ja p3 61 61 a 2-rear Mum period Mbw+e) ERR 1.39 2.5 O6] O. Om IwFI LM LM O6] 0,67 O. Ol admwd JO N 61 6] 0 lo-rear Murn periaa RRIaHn) z.M a33 1A t]3 0. RV—rbsl z.M a33 1A 'n 0. Ol edmwd JO N 61 61 0 Sunrmry. RM 60--IDA #2 = 0.77 AC 1000 ki ILI CROZET ANIMAL WELLNESS CENTER PREDEV POA MAP POTfl�2 j \ NOTTAW TMP 56-11 COUNTY OF ALBEMARLE DB 3830 PG 168 DB 1671 PG 603 PLAT ED 367 PG 155 PLAT ZONE: R2 RESIDENTIAL USE FOREST 5.51 AC IIB t1// ?III ho IDA #1 = 1.09 AC Em PREDEV DRAINAGE AREA 1: 1.09 AC HSG B AREA: 1.09 AC TURF: 0.79 AC IMPERVIOUS: 0.30 AC TOC TO POA 1: 11.8 MIN. PREDEV DRAINAGE AREA 2:0.77 AC HSG B AREA: 0.77 AC TURF: 0.67 AC IMPERVIOUS: 0.10 AC TOC TO POA 2: 10.9 MIN. 011 1 40 80 TIMP 56A2-01--6 R&H PARTNERS, LLC DB 4024 PC 567 DB 4079 PG 391 PLAT DB 367 PG 155 PLAT DB 255 PG 175 DESC. ZONE: R2 RESIDENTIAL USE: SINGLE FAMILY RESIDENTIAL 8.08 AC 120 Scale: 1 1 CROZET ANIMAL WELLNESS CENTER POSTDEV POA MAP s DA #4 = 0.330 AC1 0 -IDA #3 = 0.593 ACI ■ GE 0 k POA 1 TMP 56-11 COUNTY OF ALBEMARLE DB 3830 PG 168 DB 1671 PG 603 PLAT DB 367 PG 155 PLAT ZONE: R2 RESIDENTIAL USE: FOREST 5.51 AC POSTDEV DRAINAGE AREA 1: 0.459 AC HSG B AREA: 0.459 AC TURF: 0.459 AC IMPERVIOUS: 0.00 AC TOC TO POA 2: 12.2 MIN. POSTDEV DRAINAGE AREA 2: 0.252 AC HSG B AREA: 0.252 AC TURF: 0.00 AC IMPERVIOUS: 0.252 AC TOC TO POA 2: 12.2 MIN. POSTDEV DRAINAGE AREA 3: 0.593 AC HSG B AREA: 0.593 AC TURF: 0.144 AC IMPERVIOUS: 0.449 AC TOC TO POA 2: 12.8 MIN. POSTDEV DRAINAGE AREA 4: 0.330 AC HSG B AREA: 0.330 AC �s TURF: 0.330 AC IMPERVIOUS: 0.00 AC TOC TO POA 2: 12.8 MIN. DA #5 = 0.230 AC 40 1 0 POSTDEV DRAINAGE AREA 2: 0.230 AC HSG B AREA: 0.230 AC TURF: 0.230 AC IMPERVIOUS: 0.00 AC TOC TO POA 1: 11.1 MIN. TMP 56A2-01--6 R&H PARTNERS, LLC DB 4024 PG 567 DB 4079 PG 391 PLAT DB 367 PG 155 PLAT DB 255 PG 175 DESC. ZONE: R2 RESIDENTIAL USE: SINGLE FAMILY RESIDENTIAL 8.08 AC N 40 80 120 1 Energy Balance Equation Summary Crozet Animal Wellness (POA) Qdeveloped5 I.F. *()pre-developed*RVPre-Developed)/Rudeveloped Qdeveloped5 (Qforestedx RVforested) Redeveloped Predev Postdev SITE AREA: 1.86 ac 1.86 ac Qpre-develope = 1.75 RVPre-Develo = 0.107 Max Qdevel = 0.78 cfs RVDeveloped = 0.191 Achieved Post-Dev Max Runoff Q1yr = 0,72 cfs. Site complies with 9VAC25-870-66-(3)A Maximum Q10yr = 6.46 cfs (predev) Achieved Q10yr = 5.84 cfs Crozet Animal Wellness Center Time of Concentration Calculations - Predev 1 100 ft overland flow 10.0% slope 0.35 C-value 9.2 min 5eelye Chart 201 ft s. c. flow 6.5% slope 1.3 fps velocity 2.6 min. NEH Figure 15-4 00ft swale height min. Kirpich Chart 11.8 min. 100 ft overland flow 10.0% slope 0.35 C-value 9.2 min 5eelye Chart s. c. flow -field slope velocity min. NEH Figure 15-4 140 ft swale 2 ft height 1.7 min. Kirpich Chart 10.9 min. Crozet Animal Wellness Center Time of Concentration Calculations - Postdev 1 100 ft overland flow 10.0% slope 0.35 C-value 9.2 min Seelye Chart 256 ft s. c. flow -field 7.5% slope 1.4 fps velocity 3.0 min. NEH Figure 15-4 swale height min. Kirpich Chart 12.2 min. 2 100 ft overland flow 10.0% slope 0.35 C-value 9.2 min Seelye Chart 256 ft s. c. flow -field 7.5% slope 1.4 fps velocity 3.0 min. NEH Figure 15-4 swale height min. Kirpich Chart 12.2 min. 100 ft overland flow 10.0% slope 0.35 C-value 9.2 min Seelye Chart 0 ft s. c. flow -field slope velocity min. NEH Figure 15-4 248 ft swale 2 ft height 3.6 min. Kirpich Chart 12.8 min. 4 100 ft overland flow 10.0% slope 0.35 C-value 9.2 min Seelye Chart 0 ft s. c. flow -field slope velocity min. NEH Figure 15-4 248 ft swale 2 ft height 3.6 min. Kirpich Chart 12.8 min. 100 ft overland flow 11.0% slope 0.35 C-value 9.5 min Seelye Chart 143 ft s. c. flow -field 9.1% slope 1.5 fps velocity 1.6 min. NEH Figure 15-4 swale height min. Kirpich Chart 11.1 min. 1S 2S DA 1 D 1 2 1L 2L POA 1 POA 2 Subcat Reach on Link Drainage Diagram for PREDEV HYDROCAD Prepared by {enter your company name here}, Printed 7/21/2021 HydroCADO 9.10 s/n 07054 0 2010 HytlroCAD Software Solutions LLC PreDev PREDEV HYDROCAD Type 11 24-hr 1-YR Rainfall=3.07" Prepared by {enter your company name here} Printed 7/21/2021 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 2 Time span=0.00-48.00 hrs, dt=0.02 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Link 1 L: POA 1 Inflow=1.18 cfs 0.073 of Primary=1.18 cfs 0.073 of Subcatchment 1 S: DA 1 Runoff Area=1.090 ac 27.52% Impervious Runoff Depth=0.80" Tc=11.8 min CN=71 Runoff=1.18 cfs 0.073 of Link 2L: POA 2 Inflow=0.57 cfs 0.037 of Primary=0.57 cfs 0.037 of Subcatchment2S: DA 2 Runoff Area=0.770 ac 12.99% Impervious Runoff Depth=0.58" Tc=10.9 min CN=66 Runoff=0.57 cfs 0.037 of Total Runoff Area = 1.860 ac Runoff Volume = 0.110 of Average Runoff Depth = 0.71" 78.49% Pervious = 1.460 ac 21.51% Impervious = 0.400 ac PreDev PREDEV HYDROCAD Type 11 24-hr 1-YR Rainfall=3.07" Prepared by {enter your company name here} Printed 7/21/2021 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 3 Summary for Link 1 L: POA 1 Inflow Area = 1.090 ac, 27.52% Impervious, Inflow Depth = 0.80" for 1-YR event Inflow = 1.18 cfs @ 12.05 hrs, Volume= 0.073 of Primary = 1.18 cfs @ 12.05 hrs, Volume= 0.073 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Summary for Subcatchment 1S: DA 1 Runoff = 1.18 cfs @ 12.05 hrs, Volume= 0.073 af, Depth= 0.80" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 1-YR Rainfall=3.07" Area (ac) CN Description 0.790 61 >75% Grass cover, Good, HSG B 0.000 55 Woods, Good, HSG B 0.300 98 1.090 71 Weighted Average 0.790 72.48% Pervious Area 0.300 27.52% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 11.8 Direct Entry, Summary for Link 2L: POA 2 Inflow Area = 0.770 ac, 12.99% Impervious, Inflow Depth = 0.58" for 1-YR event Inflow = 0.57 cfs @ 12.05 hrs, Volume= 0.037 of Primary = 0.57 cfs @ 12.05 hrs, Volume= 0.037 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Summary for Subcatchment 2S: DA 2 Runoff = 0.57 cfs @ 12.05 hrs, Volume= 0.037 af, Depth= 0.58" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 1-YR Rainfall=3.07" Area (ac) CN Description 0.670 61 >75% Grass cover, Good, HSG B 0.000 55 Woods, Good, HSG B 0.100 98 0.770 66 Weighted Average 0.670 87.01 % Pervious Area 0.100 12.99% Impervious Area PREDEV HYDROCAD Prepared by {enter your company name here} Tc Length Slope Velocity Capacity Description 10.9 Direct Entry, PreDev Type/1 24-hr 1-YR Rainfall=3.07" Printed 7/21/2021 PreDev PREDEV HYDROCAD Type 11 24-hr 10-YR Rainfall=5.58" Prepared by {enter your company name here} Printed 7/21/2021 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 5 Time span=0.00-48.00 hrs, dt=0.02 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Link 1 L: POA 1 Inflow=4.03 cfs 0.233 of Primary=4.03 cfs 0.233 of Subcatchment 1 S: DA 1 Runoff Area=1.090 ac 27.52% Impervious Runoff Depth=2.56" Tc=11.8 min CN=71 Runoff=4.03 cfs 0.233 of Link 2L: POA 2 Inflow=2.43 cfs 0.137 of Primary=2.43 cfs 0.137 of Subcatchment2S: DA 2 Runoff Area=0.770 ac 12.99% Impervious Runoff Depth=2.13" Tc=10.9 min CN=66 Runoff=2.43 cfs 0.137 of Total Runoff Area = 1.860 ac Runoff Volume = 0.370 of Average Runoff Depth = 2.39" 78.49% Pervious = 1.460 ac 21.51% Impervious = 0.400 ac PreDev PREDEV HYDROCAD Type 11 24-hr 10-YR Rainfall=5.58" Prepared by {enter your company name here} Printed 7/21/2021 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 6 Summary for Link 1 L: POA 1 Inflow Area = 1.090 ac, 27.52% Impervious, Inflow Depth = 2.56" for 10-YR event Inflow = 4.03 cfs @ 12.04 hrs, Volume= 0.233 of Primary = 4.03 cfs @ 12.04 hrs, Volume= 0.233 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Summary for Subcatchment 1S: DA 1 Runoff = 4.03 cfs @ 12.04 hrs, Volume= 0.233 af, Depth= 2.56" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 10-YR Rainfall=5.58" Area (ac) CN Description 0.790 61 >75% Grass cover, Good, HSG B 0.000 55 Woods, Good, HSG B 0.300 98 1.090 71 Weighted Average 0.790 72.48% Pervious Area 0.300 27.52% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 11.8 Direct Entry, Summary for Link 2L: POA 2 Inflow Area = 0.770 ac, 12.99% Impervious, Inflow Depth = 2.13" for 10-YR event Inflow = 2.43 cfs @ 12.03 hrs, Volume= 0.137 of Primary = 2.43 cfs @ 12.03 hrs, Volume= 0.137 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Summary for Subcatchment 2S: DA 2 Runoff = 2.43 cfs @ 12.03 hrs, Volume= 0.137 af, Depth= 2.13" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 10-YR Rainfall=5.58" Area (ac) CN Description 0.670 61 >75% Grass cover, Good, HSG B 0.000 55 Woods, Good, HSG B 0.100 98 0.770 66 Weighted Average 0.670 87.01 % Pervious Area 0.100 12.99% Impervious Area PREDEV HYDROCAD Prepared by {enter your com PreDev Type/1 24-hr 10-YR Rainfall=5.58" name here} Printed 7/21/2021 Tc Length Slope Velocity Capacity Description 10.9 Direct Entry, PreDev PREDEV HYDROCAD Type 11 24-hr 100-YR Rainfall=9.08" Prepared by {enter your company name here} Printed 7/21/2021 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 8 Time span=0.00-48.00 hrs, dt=0.02 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Link 1 L: POA 1 Inflow=8.63 cfs 0.502 of Primary=8.63 cfs 0.502 of Subcatchment 1 S: DA 1 Runoff Area=1.090 ac 27.52% Impervious Runoff Depth=5.53" Tc=11.8 min CN=71 Runoff=8.63 cfs 0.502 of Link 2L: POA 2 Inflow=5.63 cfs 0.315 of Primary=5.63 cfs 0.315 of Subcatchment2S: DA 2 Runoff Area=0.770 ac 12.99% Impervious Runoff Depth=4.91" Tc=10.9 min CN=66 Runoff=5.63 cfs 0.315 of Total Runoff Area = 1.860 ac Runoff Volume = 0.817 of Average Runoff Depth = 5.27" 78.49% Pervious = 1.460 ac 21.51% Impervious = 0.400 ac PreDev PREDEV HYDROCAD Type 11 24-hr 100-YR Rainfall=9.08" Prepared by {enter your company name here} Printed 7/21/2021 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 9 Summary for Link 1 L: POA 1 Inflow Area = 1.090 ac, 27.52% Impervious, Inflow Depth = 5.53" for 100-YR event Inflow = 8.63 cfs @ 12.03 hrs, Volume= 0.502 of Primary = 8.63 cfs @ 12.03 hrs, Volume= 0.502 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Summary for Subcatchment 1S: DA 1 Runoff = 8.63 cfs @ 12.03 hrs, Volume= 0.502 af, Depth= 5.53" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 100-YR Rainfall=9.08" Area (ac) CN Description 0.790 61 >75% Grass cover, Good, HSG B 0.000 55 Woods, Good, HSG B 0.300 98 1.090 71 Weighted Average 0.790 72.48% Pervious Area 0.300 27.52% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 11.8 Direct Entry, Summary for Link 2L: POA 2 Inflow Area = 0.770 ac, 12.99% Impervious, Inflow Depth = 4.91" for 100-YR event Inflow = 5.63 cfs @ 12.03 hrs, Volume= 0.315 of Primary = 5.63 cfs @ 12.03 hrs, Volume= 0.315 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Summary for Subcatchment 2S: DA 2 Runoff = 5.63 cfs @ 12.03 hrs, Volume= 0.315 af, Depth= 4.91" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 100-YR Rainfall=9.08" Area (ac) CN Description 0.670 61 >75% Grass cover, Good, HSG B 0.000 55 Woods, Good, HSG B 0.100 98 0.770 66 Weighted Average 0.670 87.01 % Pervious Area 0.100 12.99% Impervious Area PREDEV HYDROCAD Prepared by {enter your com PreDev Type/1 24-hr 100-YR Rainfall=9.08" name here} Printed 7/21/2021 Tc Length Slope Velocity Capacity Description 10.9 Direct Entry, 2S DA 3 1P 1S 3S O DA1 A2 4P NI DA 5 fto offsite) DETENTION 2 C-740 DETEN ION 1 SC-740 4S DA 4 1L 2L POA 1 S4 Reach 4on Llflk POA 2 PostDev CROZET ANIMAL WELLNESS POSTDEV Type 11 24-hr 1 YR Rainfall=3.07" Prepared by {enter your company name here} Printed 7/21/2021 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 2 Time span=0.00-48.00 hrs, dt=0.02 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Link 1 L: PDA 1 Inflow=0.63 cfs 0.165 of Primary=0.63 cfs 0.165 of Pond 1 P: DETENTION 2 SC-740 Peak Elev=655.86' Storage=0.044 of Inflow=1.61 cfs 0.097 of Outflow=0.33 cfs 0.088 of Subcatchment 1 S: DA 1 Runoff Area=0.459 ac 0.00% Impervious Runoff Depth=0.39" Tc=12.2 min CN=61 Runoff=0.17 cfs 0.015 of Link 2L: PDA 2 Inflow=0.09 cfs 0.008 of Primary=0.09 cfs 0.008 of Subcatchment2S: DA 3 Runoff Area=0.593 ac 75.72% Impervious Runoff Depth=1.96" Tc=12.8 min CN=89 Runoff=1.61 cfs 0.097 of Subcatchment3S: DA 2 Runoff Area=0.252 ac 100.00% Impervious Runoff Depth=2.84" Tc=12.2 min CN=98 Runoff=0.90 cfs 0.060 of Pond 4P: DETENTION 1 SC-740 Peak Elev=656.08' Storage=0.032 of Inflow=1.05 cfs 0.075 of Outflow=0.25 cfs 0.066 of Subcatchment4S: DA 4 Runoff Area=0.330 ac 0.00% Impervious Runoff Depth=0.39" Tc=10.9 min CN=61 Runoff=0.13 cfs 0.011 of Subcatchment5S: DA 5 (to offsite) Runoff Area=0.230 ac 0.00% Impervious Runoff Depth=0.39" Tc=11.8 min CN=61 Runoff=0.09 cfs 0.008 of Total Runoff Area = 1.864 ac Runoff Volume = 0.190 of Average Runoff Depth = 1.22" 62.39% Pervious = 1.163 ac 37.61% Impervious = 0.701 ac PostDev CROZET ANIMAL WELLNESS POSTDEV Type 11 24-hr 1 YR Rainfall=3.07" Prepared by {enter your company name here) Printed 7/21/2021 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 3 Summary for Link 1 L: POA 1 Inflow Area = 1.634 ac, 42.90% Impervious, Inflow Depth = 1.21" for 1 YR event Inflow = 0.63 cfs @ 12.15 hrs, Volume= 0.165 of Primary = 0.63 cfs @ 12.15 hrs, Volume= 0.165 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Summary for Pond 1 P: DETENTION 2 SC-740 Inflow Area = 0.593 ac, 75.72% Impervious, Inflow Depth = 1.96" for 1 YR event Inflow = 1.61 cfs @ 12.04 hrs, Volume= 0.097 of Outflow = 0.33 cfs @ 12.36 hrs, Volume= 0.088 af, Atten= 80%, Lag= 18.7 min Primary = 0.33 cfs @ 12.36 hrs, Volume= 0.088 of Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Peak Elev= 655.86' @ 12.36 hrs Surf.Area= 0.026 ac Storage= 0.044 of Plug -Flow detention time= 128.6 min calculated for 0.088 of (91 % of inflow) Center -of -Mass det. time= 82.5 min ( 898.5 - 816.0 ) Volume Invert Avail.Storage Storage Description #1 653.00' 0.042 of 12.00'W x 94.001 x 5.00'H STONE BEDDING 0.129 of Overall - 0.025 of Embedded = 0.104 of x 40.0% Voids #2 653.83' 0.025 of StormTech SC-740 x 24 Inside #1 Effective Size= 44.6"W x 30.0"H => 6.45 sf x 7.121 = 45.9 cf Overall Size= 51.0"W x 30.0"H x 7.561 with 0.44' Overlap 0.067 of Total Available Storage Device Routing Invert Outlet Devices #1 Primary 653.83' 24.0" Round PRIMARY 24" OUTLET L= 45.0' Ke= 0.300 Inlet / Outlet Invert= 653.83' / 653.38' S= 0.0100 T Cc= 0.900 n= 0.012 #2 Device 1 653.83' 3.0" Vert. 1 YR ORIFICE C= 0.600 #3 Device 1 657.00' 4.0' long x 1.50' rise Sharp -Crested Rectangular Weir 2 End Contraction(s) 2.0' Crest Height Primary OutFlow Max=0.33 cfs @ 12.36 hrs HW=655.86' (Free Discharge) tTPRIMARY 24" OUTLET (Passes 0.33 cfs of 15.59 cfs potential flow) 2=1 YR ORIFICE (Orifice Controls 0.33 cfs @ 6.65 fps) 3=Sharp-Crested Rectangular Weir( Controls 0.00 cfs) Summary for Subcatchment 1S: DA 1 Runoff = 0.17 cfs @ 12.08 hrs, Volume= 0.015 af, Depth= 0.39" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type 11 24-hr 1 YR Rainfall=3.07" PostDev CROZET ANIMAL WELLNESS POSTDEV Type 11 24-hr 1 YR Rainfall=3.07" Prepared by {enter your company name here} Printed 7/21/2021 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 4 Area (ac) CN Description 0.459 61 >75% Grass cover, Good, HSG B 0.000 55 Woods, Good, HSG B n, n o 0.459 61 Weighted Average 0.459 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.2 Direct Entry, Summary for Link 2L: POA 2 Inflow Area = 0.230 ac, 0.00% Impervious, Inflow Depth = 0.39" for 1 YR event Inflow = 0.09 cfs @ 12.07 hrs, Volume= 0.008 of Primary = 0.09 cfs @ 12.07 hrs, Volume= 0.008 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Summary for Subcatchment 2S: DA 3 Runoff = 1.61 cfs @ 12.04 hrs, Volume= 0.097 af, Depth= 1.96" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 1 YR Rainfall=3.07" Area (ac) CN Description 0.144 61 >75% Grass cover, Good, HSG B 0.000 55 Woods, Good, HSG B 0.449 98 0.593 89 Weighted Average 0.144 24.28% Pervious Area 0.449 75.72% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.8 Direct Entry, Summary for Subcatchment 3S: DA 2 Runoff = 0.90 cfs @ 12.03 hrs, Volume= 0.060 af, Depth= 2.84" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type 11 24-hr 1 YR Rainfall=3.07" PostDev CROZET ANIMAL WELLNESS POSTDEV Type 11 24-hr 1 YR Rainfall=3.07" Prepared by {enter your company name here} Printed 7/21/2021 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 5 Area (ac) CN Description 0.252 98 0.252 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.2 Direct Entry, Summary for Pond 4P: DETENTION 1 SC-740 Inflow Area = 0.711 ac, 35.44% Impervious, Inflow Depth = 1.26" for 1 YR event Inflow = 1.05 cfs @ 12.04 hrs, Volume= 0.075 of Outflow = 0.25 cfs @ 12.31 hrs, Volume= 0.066 af, Atten= 76%, Lag= 16.2 min Primary = 0.25 cfs @ 12.31 hrs, Volume= 0.066 of Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Peak Elev= 656.08' @ 12.31 hrs Surf.Area= 0.027 ac Storage= 0.032 of Plug -Flow detention time= 166.4 min calculated for 0.066 of (88% of inflow) Center -of -Mass det. time= 104.4 min ( 896.9 - 792.5 ) Volume Invert Avail.Storage Storage Description #1 654.00' 0.044 of 12.00'W x 98.001 x 5.00'H STONE BEDDING 0.135 of Overall - 0.025 of Embedded = 0.110 of x 40.0% Voids #2 654.83' 0.025 of StormTech SC-740 x 24 Inside #1 Effective Size= 44.6"W x 30.0"H => 6.45 sf x 7.121 = 45.9 cf Overall Size= 51.0"W x 30.0"H x 7.561 with 0.44' Overlap 0.069 of Total Available Storage Device Routing Invert Outlet Devices #1 Primary 654.83' 24.0" Round PRIMARY 24" OUTLET L= 50.0' Ke= 0.300 Inlet / Outlet Invert= 654.83' / 654.33' S= 0.0100 T Cc= 0.900 n= 0.012 #2 Device 1 654.83' 3.0" Vert. 1 YR ORIFICE C= 0.600 #3 Device 1 658.00' 5.0' long x 1.50' rise Sharp -Crested Rectangular Weir 2 End Contraction(s) 2.0' Crest Height Primary OutFlow Max=0.25 cfs @ 12.31 hrs HW=656.08' (Free Discharge) t1=PRIMARY 24" OUTLET (Passes 0.25 cfs of 7.62 cfs potential flow) �2=1 YR ORIFICE (Orifice Controls 0.25 cfs @ 5.10 fps) 3=Sharp-Crested Rectangular Weir( Controls 0.00 cfs) Summary for Subcatchment 4S: DA 4 Runoff = 0.13 cfs @ 12.06 hrs, Volume= 0.011 af, Depth= 0.39" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type 11 24-hr 1 YR Rainfall=3.07" PostDev CROZET ANIMAL WELLNESS POSTDEV Type 11 24-hr 1 YR Rainfall=3.07" Prepared by {enter your company name here) Printed 7/21/2021 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 6 Area (ac) CN Description 0.330 61 0.330 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.9 Direct Entry, Summary for Subcatchment 5S: DA 5 (to offsite) Runoff = 0.09 cfs @ 12.07 hrs, Volume= 0.008 af, Depth= 0.39" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 1 YR Rainfall=3.07" Area (ac) CN Description 0.230 61 0.230 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 11.8 Direct Entry, PostDev CROZET ANIMAL WELLNESS POSTDEV Type 11 24-hr 10 YR Rainfall=5.58" Prepared by {enter your company name here} Printed 7/21/2021 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 7 Time span=0.00-48.00 hrs, dt=0.02 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Link 1 L: PDA 1 Inflow=5.29 cfs 0.422 of Primary=5.29 cfs 0.422 of Pond 1 P: DETENTION 2 SC-740 Peak Elev=657.37' Storage=0.060 of Inflow=3.42 cfs 0.214 of Outflow=3.40 cfs 0.205 of Subcatchment 1 S: DA 1 Runoff Area=0.459 ac 0.00% Impervious Runoff Depth=1.73" Tc=12.2 min CN=61 Runoff=1.09 cfs 0.066 of Link 2L: PDA 2 Inflow=0.55 cfs 0.033 of Primary=0.55 cfs 0.033 of Subcatchment2S: DA 3 Runoff Area=0.593 ac 75.72% Impervious Runoff Depth=4.33" Tc=12.8 min CN=89 Runoff=3.42 cfs 0.214 of Subcatchment3S: DA 2 Runoff Area=0.252 ac 100.00% Impervious Runoff Depth=5.34" Tc=12.2 min CN=98 Runoff=1.65 cfs 0.112 of Pond 4P: DETENTION 1 SC-740 Peak Elev=658.20' Storage=0.061 of Inflow=2.72 cfs 0.178 of Outflow=1.93 cfs 0.169 of Subcatchment4S: DA 4 Runoff Area=0.330 ac 0.00% Impervious Runoff Depth=1.73" Tc=10.9 min CN=61 Runoff=0.82 cfs 0.048 of Subcatchment5S: DA 5 (to offsite) Runoff Area=0.230 ac 0.00% Impervious Runoff Depth=1.73" Tc=11.8 min CN=61 Runoff=0.55 cfs 0.033 of Total Runoff Area = 1.864 ac Runoff Volume = 0.473 of Average Runoff Depth = 3.05" 62.39% Pervious = 1.163 ac 37.61% Impervious = 0.701 ac PostDev CROZET ANIMAL WELLNESS POSTDEV Type 11 24-hr 10 YR Rainfall=5.58" Prepared by {enter your company name here} Printed 7/21/2021 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 8 Summary for Link 1 L: POA 1 Inflow Area = 1.634 ac, 42.90% Impervious, Inflow Depth = 3.10" for 10 YR event Inflow = 5.29 cfs @ 12.12 hrs, Volume= 0.422 of Primary = 5.29 cfs @ 12.12 hrs, Volume= 0.422 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Summary for Pond 1 P: DETENTION 2 SC-740 Inflow Area = 0.593 ac, 75.72% Impervious, Inflow Depth = 4.33" for 10 YR event Inflow = 3.42 cfs @ 12.04 hrs, Volume= 0.214 of Outflow = 3.40 cfs @ 12.07 hrs, Volume= 0.205 af, Atten= 0%, Lag= 1.5 min Primary = 3.40 cfs @ 12.07 hrs, Volume= 0.205 of Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Peak Elev= 657.37' @ 12.07 hrs Surf.Area= 0.026 ac Storage= 0.060 of Plug -Flow detention time= 89.5 min calculated for 0.205 of (96% of inflow) Center -of -Mass det. time= 65.8 min ( 859.5 - 793.7 ) Volume Invert Avail.Storage Storage Description #1 653.00' 0.042 of 12.00'W x 94.001 x 5.00'H STONE BEDDING 0.129 of Overall - 0.025 of Embedded = 0.104 of x 40.0% Voids #2 653.83' 0.025 of StormTech SC-740 x 24 Inside #1 Effective Size= 44.6"W x 30.0"H => 6.45 sf x 7.121 = 45.9 cf Overall Size= 51.0"W x 30.0"H x 7.561 with 0.44' Overlap 0.067 of Total Available Storage Device Routing Invert Outlet Devices #1 Primary 653.83' 24.0" Round PRIMARY 24" OUTLET L= 45.0' Ke= 0.300 Inlet / Outlet Invert= 653.83' / 653.38' S= 0.0100 T Cc= 0.900 n= 0.012 #2 Device 1 653.83' 3.0" Vert. 1 YR ORIFICE C= 0.600 #3 Device 1 657.00' 4.0' long x 1.50' rise Sharp -Crested Rectangular Weir 2 End Contraction(s) 2.0' Crest Height Primary OutFlow Max=3.34 cfs @ 12.07 hrs HW=657.37' (Free Discharge) tTPRIMARY 24" OUTLET (Passes 3.34 cfs of 26.64 cfs potential flow) 2=1 YR ORIFICE (Orifice Controls 0.44 cfs @ 8.89 fps) 3=Sharp-Crested Rectangular Weir(Weir Controls 2.90 cfs @ 2.02 fps) Summary for Subcatchment 1S: DA 1 Runoff = 1.09 cfs @ 12.05 hrs, Volume= 0.066 af, Depth= 1.73" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type 11 24-hr 10 YR Rainfall=5.58" PostDev CROZET ANIMAL WELLNESS POSTDEV Type 11 24-hr 10 YR Rainfall=5.58" Prepared by {enter your company name here} Printed 7/21/2021 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 9 Area (ac) CN Description 0.459 61 >75% Grass cover, Good, HSG B 0.000 55 Woods, Good, HSG B n, n o 0.459 61 Weighted Average 0.459 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.2 Direct Entry, Summary for Link 2L: POA 2 Inflow Area = 0.230 ac, 0.00% Impervious, Inflow Depth = 1.73" for 10 YR event Inflow = 0.55 cfs @ 12.05 hrs, Volume= 0.033 of Primary = 0.55 cfs @ 12.05 hrs, Volume= 0.033 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Summary for Subcatchment 2S: DA 3 Runoff = 3.42 cfs @ 12.04 hrs, Volume= 0.214 af, Depth= 4.33" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 10 YR Rainfall=5.58" Area (ac) CN Description 0.144 61 >75% Grass cover, Good, HSG B 0.000 55 Woods, Good, HSG B 0.449 98 0.593 89 Weighted Average 0.144 24.28% Pervious Area 0.449 75.72% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.8 Direct Entry, Summary for Subcatchment 3S: DA 2 Runoff = 1.65 cfs @ 12.03 hrs, Volume= 0.112 af, Depth= 5.34" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type 11 24-hr 10 YR Rainfall=5.58" PostDev CROZET ANIMAL WELLNESS POSTDEV Type 11 24-hr 10 YR Rainfall=5.58" Prepared by {enter your company name here) Printed 7/21/2021 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 10 Area (ac) CN Description 0.252 98 0.252 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.2 Direct Entry, Summary for Pond 4P: DETENTION 1 SC-740 Inflow Area = 0.711 ac, 35.44% Impervious, Inflow Depth = 3.01" for 10 YR event Inflow = 2.72 cfs @ 12.04 hrs, Volume= 0.178 of Outflow = 1.93 cfs @ 12.13 hrs, Volume= 0.169 af, Atten= 29%, Lag= 5.6 min Primary = 1.93 cfs @ 12.13 hrs, Volume= 0.169 of Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Peak Elev= 658.20' @ 12.13 hrs Surf.Area= 0.027 ac Storage= 0.061 of Plug -Flow detention time= 115.6 min calculated for 0.169 of (95% of inflow) Center -of -Mass det. time= 85.5 min ( 877.7 - 792.2 ) Volume Invert Avail.Storage Storage Description #1 654.00' 0.044 of 12.00'W x 98.001 x 5.00'H STONE BEDDING 0.135 of Overall - 0.025 of Embedded = 0.110 of x 40.0% Voids #2 654.83' 0.025 of StormTech SC-740 x 24 Inside #1 Effective Size= 44.6"W x 30.0"H => 6.45 sf x 7.121 = 45.9 cf Overall Size= 51.0"W x 30.0"H x 7.561 with 0.44' Overlap 0.069 of Total Available Storage Device Routing Invert Outlet Devices #1 Primary 654.83' 24.0" Round PRIMARY 24" OUTLET L= 50.0' Ke= 0.300 Inlet / Outlet Invert= 654.83' / 654.33' S= 0.0100 T Cc= 0.900 n= 0.012 #2 Device 1 654.83' 3.0" Vert. 1 YR ORIFICE C= 0.600 #3 Device 1 658.00' 5.0' long x 1.50' rise Sharp -Crested Rectangular Weir 2 End Contraction(s) 2.0' Crest Height Primary OutFlow Max=1.89 cfs @ 12.13 hrs HW=658.20' (Free Discharge) t1=PRIMARY 24" OUTLET (Passes 1.89 cfs of 25.48 cfs potential flow) �2=1 YR ORIFICE (Orifice Controls 0.43 cfs @ 8.67 fps) 3=Sharp-Crested Rectangular Weir(Weir Controls 1.47 cfs @ 1.48 fps) Summary for Subcatchment 4S: DA 4 Runoff = 0.82 cfs @ 12.04 hrs, Volume= 0.048 af, Depth= 1.73" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type 11 24-hr 10 YR Rainfall=5.58" PostDev CROZET ANIMAL WELLNESS POSTDEV Type 11 24-hr 10 YR Rainfall=5.58" Prepared by {enter your company name here) Printed 7/21/2021 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 11 Area (ac) CN Description 0.330 61 0.330 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.9 Direct Entry, Summary for Subcatchment 5S: DA 5 (to offsite) Runoff = 0.55 cfs @ 12.05 hrs, Volume= 0.033 af, Depth= 1.73" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 10 YR Rainfall=5.58" Area (ac) CN Description 0.230 61 0.230 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 11.8 Direct Entry, PostDev CROZET ANIMAL WELLNESS POSTDEV Type 11 24-hr 100 YR Rainfall=9.08" Prepared by {enter your company name here} Printed 7/21/2021 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 12 Time span=0.00-48.00 hrs, dt=0.02 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Link 1 L: PDA 1 Inflow=13.43 cfs 0.833 of Primary=13.43 cfs 0.833 of Pond 1 P: DETENTION 2 SC-740 Peak Elev=657.56' Storage=0.062 of Inflow=5.91 cfs 0.383 of Outflow=5.89 cfs 0.374 of Subcatchment 1 S: DA 1 Runoff Area=0.459 ac 0.00% Impervious Runoff Depth=4.29" Tc=12.2 min CN=61 Runoff=2.80 cfs 0.164 of Link 2L: PDA 2 Inflow=1.42 cfs 0.082 of Primary=1.42 cfs 0.082 of Subcatchment2S: DA 3 Runoff Area=0.593 ac 75.72% Impervious Runoff Depth=7.75" Tc=12.8 min CN=89 Runoff=5.91 cfs 0.383 of Subcatchment3S: DA 2 Runoff Area=0.252 ac 100.00% Impervious Runoff Depth=8.84" Tc=12.2 min CN=98 Runoff=2.69 cfs 0.186 of Pond 4P: DETENTION 1 SC-740 Peak Elev=658.45' Storage=0.063 of Inflow=5.48 cfs 0.350 of Outflow=5.46 cfs 0.341 of Subcatchment4S: DA 4 Runoff Area=0.330 ac 0.00% Impervious Runoff Depth=4.29" Tc=10.9 min CN=61 Runoff=2.11 cfs 0.118 of Subcatchment5S: DA 5 (to offsite) Runoff Area=0.230 ac 0.00% Impervious Runoff Depth=4.29" Tc=11.8 min CN=61 Runoff=1.42 cfs 0.082 of Total Runoff Area = 1.864 ac Runoff Volume = 0.933 of Average Runoff Depth = 6.00" 62.39% Pervious = 1.163 ac 37.61% Impervious = 0.701 ac PostDev CROZET ANIMAL WELLNESS POSTDEV Type 11 24-hr 100 YR Rainfall=9.08" Prepared by {enter your company name here} Printed 7/21/2021 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 13 Summary for Link 1 L: POA 1 Inflow Area = 1.634 ac, 42.90% Impervious, Inflow Depth = 6.12" for 100 YR event Inflow = 13.43 cfs @ 12.04 hrs, Volume= 0.833 of Primary = 13.43 cfs @ 12.04 hrs, Volume= 0.833 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Summary for Pond 1 P: DETENTION 2 SC-740 Inflow Area = 0.593 ac, 75.72% Impervious, Inflow Depth = 7.75" for 100 YR event Inflow = 5.91 cfs @ 12.04 hrs, Volume= 0.383 of Outflow = 5.89 cfs @ 12.05 hrs, Volume= 0.374 af, Atten= 0%, Lag= 0.5 min Primary = 5.89 cfs @ 12.05 hrs, Volume= 0.374 of Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Peak Elev= 657.56' @ 12.05 hrs Surf.Area= 0.026 ac Storage= 0.062 of Plug -Flow detention time= 66.4 min calculated for 0.374 of (98% of inflow) Center -of -Mass det. time= 52.3 min ( 830.5 - 778.1 ) Volume Invert Avail.Storage Storage Description #1 653.00' 0.042 of 12.00'W x 94.001 x 5.00'H STONE BEDDING 0.129 of Overall - 0.025 of Embedded = 0.104 of x 40.0% Voids #2 653.83' 0.025 of StormTech SC-740 x 24 Inside #1 Effective Size= 44.6"W x 30.0"H => 6.45 sf x 7.121 = 45.9 cf Overall Size= 51.0"W x 30.0"H x 7.561 with 0.44' Overlap 0.067 of Total Available Storage Device Routing Invert Outlet Devices #1 Primary 653.83' 24.0" Round PRIMARY 24" OUTLET L= 45.0' Ke= 0.300 Inlet / Outlet Invert= 653.83' / 653.38' S= 0.0100 T Cc= 0.900 n= 0.012 #2 Device 1 653.83' 3.0" Vert. 1 YR ORIFICE C= 0.600 #3 Device 1 657.00' 4.0' long x 1.50' rise Sharp -Crested Rectangular Weir 2 End Contraction(s) 2.0' Crest Height Primary OutFlow Max=5.86 cfs @ 12.05 hrs HW=657.55' (Free Discharge) tTPRIMARY 24" OUTLET (Passes 5.86 cfs of 27.88 cfs potential flow) 2=1 YR ORIFICE (Orifice Controls 0.45 cfs @ 9.13 fps) 3=Sharp-Crested Rectangular Weir(Weir Controls 5.41 cfs @ 2.52 fps) Summary for Subcatchment 1S: DA 1 Runoff = 2.80 cfs @ 12.04 hrs, Volume= 0.164 af, Depth= 4.29" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type 11 24-hr 100 YR Rainfall=9.08" PostDev CROZET ANIMAL WELLNESS POSTDEV Type 11 24-hr 100 YR Rainfall=9.08" Prepared by {enter your company name here} Printed 7/21/2021 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 14 Area (ac) CN Description 0.459 61 >75% Grass cover, Good, HSG B 0.000 55 Woods, Good, HSG B n, n o 0.459 61 Weighted Average 0.459 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.2 Direct Entry, Summary for Link 2L: POA 2 Inflow Area = 0.230 ac, 0.00% Impervious, Inflow Depth = 4.29" for 100 YR event Inflow = 1.42 cfs @ 12.04 hrs, Volume= 0.082 of Primary = 1.42 cfs @ 12.04 hrs, Volume= 0.082 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Summary for Subcatchment 2S: DA 3 Runoff = 5.91 cfs @ 12.04 hrs, Volume= 0.383 af, Depth= 7.75" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 100 YR Rainfall=9.08" Area (ac) CN Description 0.144 61 >75% Grass cover, Good, HSG B 0.000 55 Woods, Good, HSG B 0.449 98 0.593 89 Weighted Average 0.144 24.28% Pervious Area 0.449 75.72% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.8 Direct Entry, Summary for Subcatchment 3S: DA 2 Runoff = 2.69 cfs @ 12.03 hrs, Volume= 0.186 af, Depth= 8.84" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type 11 24-hr 100 YR Rainfall=9.08" PostDev CROZET ANIMAL WELLNESS POSTDEV Type 11 24-hr 100 YR Rainfall=9.08" Prepared by {enter your company name here} Printed 7/21/2021 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 15 Area (ac) CN Description 0.252 98 0.252 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.2 Direct Entry, Summary for Pond 4P: DETENTION 1 SC-740 Inflow Area = 0.711 ac, 35.44% Impervious, Inflow Depth = 5.90" for 100 YR event Inflow = 5.48 cfs @ 12.04 hrs, Volume= 0.350 of Outflow = 5.46 cfs @ 12.05 hrs, Volume= 0.341 af, Atten= 0%, Lag= 0.5 min Primary = 5.46 cfs @ 12.05 hrs, Volume= 0.341 of Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Peak Elev= 658.45' @ 12.05 hrs Surf.Area= 0.027 ac Storage= 0.063 of Plug -Flow detention time= 77.2 min calculated for 0.341 of (97% of inflow) Center -of -Mass det. time= 60.9 min ( 848.5 - 787.6 ) Volume Invert Avail.Storage Storage Description #1 654.00' 0.044 of 12.00'W x 98.001 x 5.00'H STONE BEDDING 0.135 of Overall - 0.025 of Embedded = 0.110 of x 40.0% Voids #2 654.83' 0.025 of StormTech SC-740 x 24 Inside #1 Effective Size= 44.6"W x 30.0"H => 6.45 sf x 7.121 = 45.9 cf Overall Size= 51.0"W x 30.0"H x 7.561 with 0.44' Overlap 0.069 of Total Available Storage Device Routing Invert Outlet Devices #1 Primary 654.83' 24.0" Round PRIMARY 24" OUTLET L= 50.0' Ke= 0.300 Inlet / Outlet Invert= 654.83' / 654.33' S= 0.0100 T Cc= 0.900 n= 0.012 #2 Device 1 654.83' 3.0" Vert. 1 YR ORIFICE C= 0.600 #3 Device 1 658.00' 5.0' long x 1.50' rise Sharp -Crested Rectangular Weir 2 End Contraction(s) 2.0' Crest Height Primary OutFlow Max=5.44 cfs @ 12.05 hrs HW=658.45' (Free Discharge) t1=PRIMARY 24" OUTLET (Passes 5.44 cfs of 27.14 cfs potential flow) �2=1 YR ORIFICE (Orifice Controls 0.44 cfs @ 9.00 fps) 3=Sharp-Crested Rectangular Weir(Weir Controls 5.00 cfs @ 2.26 fps) Summary for Subcatchment 4S: DA 4 Runoff = 2.11 cfs @ 12.03 hrs, Volume= 0.118 af, Depth= 4.29" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type 11 24-hr 100 YR Rainfall=9.08" PostDev CROZET ANIMAL WELLNESS POSTDEV Type 11 24-hr 100 YR Rainfall=9.08" Prepared by {enter your company name here) Printed 7/21/2021 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 16 Area (ac) CN Description 0.330 61 0.330 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.9 Direct Entry, Summary for Subcatchment 5S: DA 5 (to offsite) Runoff = 1.42 cfs @ 12.04 hrs, Volume= 0.082 af, Depth= 4.29" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 100 YR Rainfall=9.08" Area (ac) CN Description 0.230 61 0.230 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 11.8 Direct Entry, Outlet Protection Calculations - Reference Nomograph 3.18-3 PI a Outfall # 1 Q-10 cfs La ft W ft Do in Do ft 3Do ft d50 ft d50 in De th in B1 1 3.4 1 8 1 9.25 1 15 1 1.25 1 3.75 1 0.5 1 6 19 NOAA Atlas 14, Volume 2, Version 3r„,„" Location name: Crozet, Virginia, USA* ,.. Latitude: 36, Longitude:-76.7038° Elevation: 660.23 ft" " source: ESRI Maps° A "source: USGS POINT PRECIPITATION FREQUENCY ESTIMATES G.M. Bonin, D. Martin, B. Lin, T. Parzybok, M.Yekta. and D. Riley NOAA, National Weather Service, Silver Spring, Maryland PF tabular I PF graphical I Maps & aerials PF tabular PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches)1 Average recurrence interval (years) Duretion 1 2 5 10 25 60 1 100 00 200 500 1000 5-min 0 (0.306-0374) (0.366-0.447) (0.43 -0527) (0.485-0 594) (0.545-0 669) (0.590 729) (06 3 0 787) (0.669-0.842) (0.7012-0 912) (0.746-0 970) 1.30 10-min (0.488-0 597) (0.585-0-0..715) (0.69 0.844) (0.7760.949) (0.869-1 w) (0.940-5.16) (1.0- .25) (1.06-21.34) : (13-t.44) 1 (1.17-31753) 0.812 16-min (0.6110-0.78) (0.736-0899) (0.8744-11.07) (0.982-11.20) (110-21335) (119-3147) (1.274358) (1.34-d268) (1. 2-6L82) (1.a71292) 30-min (0. 36- 02) 1 (1.021224) 1 (1.24-1.52) 1 (1.42-1.74) 1 (1.63-2?00) (1.9221) (1.942.42) (2.08-2762) (2.6-22..89) (2.393.11) 1.15 60-min A756) 4 2 (1.07) (1.2 (1.59 1694) (1.85-2.27) (2.?7-2? 67) (2. 3 3.00) (2.663.33) (2.92-3.68) (3: 4-4.14) (3.484.53) 2.96 6.28 2-hr (1.23-1.55) (1.50-61888) (1.88-236) (2.21�77) (2.62-3.30) (2.95 3575) (3.294.21) (3. 3-4.69) (4.05837) (4.46-5.96) 4.14 6.85 3-hr (1.35-1.71) (1.642408) (266261) (2.40-3.05) (2.85-3.64) (3.2�14) (3.604.66) (3. 865.21) (4.85a98) (4.90-6.64) 6-hr (17 5-2.20) (2. 2-2767) (2.62 3531) (3.07 3790) 17 (3.47-4.68) (4. � 5837) (46 9-6.10) (5. 3-6.90) (5.98-8.0) (6.62 9.10) 3.00 11.1 12-hr (2.222983) (26 83.41) (3.32�56) (3.91�03) (4.7236.11) (540-27508) (6: 3-8.14) (6. 09.32) (8. 011.1) (8.97- 2.7) 207 4-hr (27 63.43) 71 (3.34-4.15) 73 (42 4-5.29) 58 (4.90.6.23) (6.068360) (6.96--08..78) (7: 3- 0.1) (8.9611.5) (10.613.7) (1114 15.6) 2-0ey (32 6-4.03) (3: 5-4.88) (5. 0-6.19) (5.84- .25) (7.04-8.79) (8.02--010.1) (9.06-131.5) (102- 3.0) (11 73 5.3) (13.0.17.3) 3-day (34 9427) (42 35.17) (5.35-6.55) (62 673.67) (7.5�29) (8. 9--610.6) (97 0. 2.1) (10.9- 3.7) (12.6-16.1) (13.9- 8.1) 4-day 7 3 (34.51) (4.515.45) (5.761-6.91) (6.67 8 08) (8.04 9979) (916-1112) (10.3- 2.8) (11.6-14A) (13.4-16.9) (14.9- 9.0) 7-day (4.345.18) (523-6.24) (65 3-73.80) (7.57 990) (9. 3- 0.9) (102- 2A) (11 4214.0) (12 7d5.7) (14.6- 8.2) (16.0. 0.3) 10-dey (4.965.84) (5.95-7.00) (7.32118.3) (8.41 9.93) (9.91--- 1.7) (111-132) (12.3-14.8) (13.6-16.4) (15.3- 8.8) (167- 0.8) 20-dey (65 9-7..59) (7.8 9204) (9A70- 0.9) (107- 2.4) (124314.3) (1374 5.9) (15.0-137.5) (16.3- 9.1) (18.0-21A) (19.3- 3.2) 30 dey (813-9.25) (9.64-131.0) (11412.9) (127--14.5) (144-116.4) (15.6-167.9) (16.9 9.4) (18?0- 0.9) (19672.8) (2027224.3) 45-day (102-$.5) 1 (12.0- 3.6) 1 (14.0- 5.8) 1 (15.5-17.5) 1 (174$ 9.7) 1 (1821.3) 1 (2021' 2.8) (21.3-24.4) (2?9-6.4) (24.0.27.9) 60-day (12.0. 3.4) (14145.8) (162- 8.1) (176 9.9) (_ 22.1) (212? 3.8) (2266.4) (23826.9) (254?6.8) (26.5- 0.2) 1 Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS). Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval. The probability that precipitation frequency estimates (for a given duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at upper bounds are not checked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values. Please refer to NOAA A9as 14 document for more information. Back to Top PF graphical C kgiat_ I LLL UN 3km \- a{�j� � Lar�Qe scscale terrain Washington, D.C.' Harrisonburg. 5 taunfpn VIRGINIA NIA Ricnd � r Lynd,b� ire, a lacks' ' .� 100km 60mi Larqe scale map i v u Sdei ruin in Blacksburg , Rwnoke 100k 60mi Large scale aerial W 4'YN 3 XWN 3 Hydrologic Soil Group —Albemarle County, Virginia 3 N (Crozet Animal Wellness Center) H 701280 701340 H 430 7eIMD TYI53] 3 R Map Sde: 1:3,150(priltd on A ppbait(8.5' z 11")sheet. Mates NN 0 45 90 180Feet Z70 //k, \ 0 150 300 am 900 Mappmjemm:Web Madnr Camermadiratm:WG584 Edge86:UrMZone17NWGSB4 USDA Natural Resources Web Soil Survey Conservation Service National Cooperative Soil Survey @ 3 4'WN L`t 7/12/2021 Page 1 of 4 3 3' V N Hydrologic Soil Group—Albemade County, Virginia Crozet Animal Wellness Center Hydrologic Soil Group Map unit symbol Map unit name Rating Acres in AOI Percent of AOI 4D Ashe loam, 15 to 25 B 1.6 3.4% percent slopes 7B Braddock loam, 2 to 7 B 12.6 26.4% percent slopes 17 Craigsville loam, 0 to 2 A 12.7 26.6% percent slopes, frequently Flooded 25B Dyke silt loam, 2 to 7 B 4.4 9.3% percent slopes 26D3 Dyke day loam, 15 to 25 B 4.1 8.5% percent slopes, severely eroded 36C Hayesville loam, 7 to 15 B 12.3 25.8% percent slopes Totals for Area of Interest 47.6 100.0% Natural Resources Web Soil Survey 7/12/2021 Conservation Service National Cooperative Soil Survey Page 3 of 4