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SDP200500093 Calculations 2006-03-06 (2)
1irs, 1 HYDROLOGIC /HYDRAULIC CALCULATIONS FOR CROZET SELF STORAGE SWM_1 March 6, 2006 44 b 11' tb 111-1161 CP LOCATION: White Hall District, Albemarle County, Virginia 'i y PREPARED BY: '= Rivanna Engineering & Surveying, PLC 1350 Stony Point Rd. Xs Charlottesville, VA 22911 P: 434.984.1599 F: 434.984.8863 t. INDEX Summary: Pre - Development: Flood Hydrographs: Post - Development: DA -M Hydrographs: Pond & Outlet Structure: Routed Hydrographs: U:ncont_ained Hydrographs - Existing (Nl) Combined Hydrographs - E: <isting (N1) . Uncon`ained Hydrographs - Proposed (N2) Combined HvdrDaraphs - Proposed (N2) . 2 3 - '0 7 -12 13 -16 17 -22 23 -2E 7 -3C 31 -34 35 -38 Drainage Area Maps are included attached at the end of this report. Run —off Summary tormwater re -Dev Pre-De Pr e -Gev Post -Post -Dev Post -Dev Manaaement DA 2 -'fear 10 -Year Dev 2 -Year 10 -Year it t.Peak eak DA Peak Srii 6 ti,sN 8 .80 12 . 5 7 M &N2 8.11 11.54 Rivanna Engineering & Surveying, PLC 434) 984 -1599 Page 1 Crozet Self Storage, SWM -1 Summary One stormwater management pond provides Stormwater management for Crozet Self Storage. Calculations were based on the previously submitted Stormwater Management Calculations from May 16, 2003. A site visit to review existing conditions found the orifice to be 12" in diameter versus the 1 1" used in the initial calculations. Drainage area DA -M flows into SWM Pond 1. Rivanna Engineering & Surveying, PLC Page 2 434) 984 -1399 Crozet Self Storage, SWM -1 Pre - Development Hydrographs lame : Type: DA -A 2 Yr Sod - _ f_ed P.a`__onai Peak Flow (Qp) = 9.00 (cfs) me to Pea.ti = 11.00 (m -n) me vi Base J1 - 55.00 (__Ln Vo ume = 0.22 (ac Time Steo = 7.00 m_r.) ow MI - 11- oi_er = _.00 ayl'IOi;A: H'iDP.OGR:.?H 7IFCP.N?ATION] ow Muit' pI 'er P.ecea ..i -mp Factor = _. 1APPPR:t7MATE STOP-AGE] Maximum Cut =low = 0.00 (cfs) Maximum: Storage = 0.22 (cu ft) BASIN !NFORM.AT7ONI wE __GHTED WATERSHED AREA] Description Area CN Runoff Coef BuiIdinas 0.10 0 0.90 Pavemen-2.00 0 0.90 woods 1.12 0 0.25 Crass 0.70 0 0.35 Overali Approximation 3.92 NA 0.62 TIME CONCENTPATION -- ";ser Defined] Time of Concentration (Tc)14.00 (min) PA DESCR st_ c u _on Type Syntner__ Total 0.86 (in) Return Period 2 yr; Storm Duration.0.23 (hr) Rivanna Engineering & Surveying, PLC Page 3 434) 984-1599 Crozet Self Storage, SWM -1 Pre - Development Hydrographs DA -A 2 Yr me er e min) ncremen-a_ 11n m_a _ce a'_n a_ 1_. :' Incremenra_ Cu flow cf3 Design Ou -low s CO 0.00 0.06 0.00 0.54 2 2 O 0.06 0.'2 0.64 29 3 3. G'0 G.06 18 0.64 1.33 4 4.00 0.06 0.25 0.64 2.57 5 5.00 0.06 0.3'_0.64 3.21 6 6.00 0.06 0.37 0.64 3.86 7 7.00 0.06 0.43 0.64 4.50 8 3.00 01.06 0.49 0.64 5.14 9 9.00 0.06 0.55 0.64 5.78 i0 10.'.10 0.06 0.62 0.64 6.43 11 1.00 0.06 0.68 0.64 7.07 2 12.00 C.06 0.74 0.64 7.71 13 13.00 O.C6 0.80 0.64 8.36 14 14.00 0.06 0.86 0.64 9.00 15.00 0.00 0.86 0.43 8.57 16 16.00 0.00 0.86 0.43 8.14 17 17.00 0.00 0.86 0.43 7.71 i8 13.00 0.00 0.86 0.43 7.29 19 19.00 0.00 0.86 0.43 6.96 20 29.00 0.00 0.86 0.43 6.43 21.00 0.00 0.86 0.43 6.00 22 22.00 0.00 0.86 0.43 5.57 23 23.00 0.00 0.86 0.43 5.14 24 24.00 0.00 0.86 0.43 4.71 25 25.00 0.00 0.86 0.43 4.29 26 26.00 0.00 0.86 0.43 3.86 27 27.00 0.00 0.86 0.43 3.43 9 28.00 0 .00 0.86 0.43 3.0C 29 29.00 0.00 0.86 0.43 2.5 30 30.00 0.00 0.36 0.43 2.14 31 31.00 0.00 G.35 0.43 i.72 32 32.00 0.00 0.86 0.43 1.29 33 33.00 0.00 0.36 0.43 0.86 34 34.00 0.00 0.86 0.43 0.43 35 35.00 0.00 0.86 0.43 0.00 Rivanna Engineering & Surveying, PLC Page 4 434) 98.1 -1399 Crozet Self Storage, SWM -1 Pre - Development Hydrographs I DA -A 10 Yr Type: edified Rar_D-:a'_. Peak Flow (Qp) _ T; r:o _ ak _ T.e Of J c 1 '.me = T:-ne S-ec = Flow Mul_io_ier = TIONAL HYDROGP?_P' IJiFGR.^A ".GN] cw ti?ul -io __ _ Receding Limb Fac- -o _ APPR.OX,I2 S =P_PGE' Maximum Outflow = Maximum Storage = BASIN INFORMATION] 12.67 (cfs) X4.00 mi ) 35.00 m.i:_) 0.31 (ac -f -) 00 M' TI) 1.00 00 I.50 0.00 (cfs) 0.31 (cu ft) WE =GrTED WATERSHED AREA] Description Area CN Runcff Coef Buildings 0.10 0 0.90 Pavement 2.00 0 0.90 Woods I.12 0 0.25 Grass 0.70 0 0.35 Overal_ Approximation 3.92 NA 0.62 TIME CCNCENTRATION -- User Defined', Time of Concentration (Tc)14.00 (min) RAINFALL DESCR PTION] Distribution Type Synthetic To'-31 Preci0itatior_ Re *Urn Period User Defined (yr) Storm Duration 0.23 (hr) Rivanna Engineering & Surveying, PLC Page 434) 984-1599 Crozet Self Storage, SWM -1 Pre - Development Hydrographs Name: DA -A 10 Xr Hyirograoh Flow VaLues: Time vs. Flow Time Time _nc ementa_ Cumulative incremental Design interval Rainfall Ra1.._`cll Outflow Outflow Rivanna Engineering & Surveying, PLC Page 6 434) 9 84-1599 1.00 0. v(J 09 0.GJ c.90 3 3.00 0.09 0.26 0.90 2.71 4.00 0.09 S. 35 0.90 3.62 7 5.00 0.09 0.43 0.90 4.52 6 6.00 0.09 0.52 0.90 5.43 00 G9 0.61 0.90 6.33 8 8.00 0.09 0.69 S.90 7.24 9 9.00 0.09 0.78 0.90 8.14 0 10.'05 0.09 0.87 0.90 9.05 11 11.00 0.09 0.95 0.90 9.95 2 12.00 0.09 i.04 0.90 10.86 3 13.00 0.09 1.13 0.90 1. 14 14.00 0.09 1.21 0.90 12.67 i5 i3.00 0.00 1.21 0.60 12.07 16 16.00 0.00 1.21 0.60 11.40 17 17.00 0.0 1.21 0.60 10.86 18 18.00 0.00 1.21 0.60 10.26 A 19.00 0.00 1.21 0.60 9.65 20 20.00 0.00 1.21 0.60 9.05 21 21.00 0.00 1.21 0.60 8.45 22 22.00 0.00 1.21 0.60 7.84 23 23.00 0.00 1.21 0.60 7.24 24 24.00 0.00 1.21 0.60 6.64 25 25.00 0.00 1.21 0.60 6.03 26 26.00 0.00 1.21 0.60 5.43 27 27.00 0.00 1.21 0.60 4.83 28 28.00 0.00 1.21 0.60 4.23 29 29.00 0.00 1.21 0.60 3.62 30 30.00 0.00 1.21 0.60 3.02 3i 31.00 0.00 1.21 0.60 2.42 32 32.00 0.00 1.21 0.60 1.81 33 33.00 0.00 1.21 0.60 i.21 34 34.00 0.00 1.21 0.60 0.61 35 35.00 0.00 1.21 0.60 0.00 Rivanna Engineering & Surveying, PLC Page 6 434) 9 84-1599 Crozet Self Storage, SWM -1 Post - Development Hydrographs e DA -M 2 Yr Peak Flow (Qp)4.62 cfs) Me -, -Paa;k !T_9.00 min) Time of Ease 0C r,i i) Ii me Stec.1.00 min) Flow Muy_ip' -_er OG LRAT_ONAL . ; 1NFORP^?'?'IO _ Flow M'sltip -ier I.00 Receding Limb Fac *_or SG i , tA . ST.J ti?aximum 01ltflow 0.00 cfs) Maximum Storage 0.06 cu f ~) F3ASIN INFORM T =ON] WEIGHTED WATERSHED AREA] Descriction Area CN Runoff Coef None> Overail Accroximation 1.40 NA 0.70 T1ME CO;CENTPAT ON -- User Defined] Time of Concentration (T = 3.00 (min) RAINFALL DESCRIPTION; Distribution Type = Synthetic Total Precipitation = 0.62 (in) Return Period = 2 (yr) Storm Duration = 0.13 (hr) Rivanna Engineering & Surveying, PLC Page 7 434) 984-1599 Crozet Self Storage, SWM -1 Post - Development Hydrographs DA -M 2 Yr G.0 8 ow , le s. _me S __cw me ne Inc emenral Cumulative _.._re aen`al Des »- 7n_. ,7a_Ra _. _ow Cut f _Ow 0.58 1.73 4 G Rivanna Engineering & Surveying, PLC Page 8 434) 984 -1599 G.0 8 15 3 3.00 0.06 G.23 0.58 1.73 4 G C.08 0.31 0.58 2.31 5.00 3 08 0.39 0.59 2.89 6 6.00 0.08 0.47 0.58 3.46 7.00 0.08 0.55 0.58 4.04 8 8.00 0.08 0.62 0.58 4.62 9.,G O.00 0.62 0.38 4.23 10.'00 0.00 0.62 0.38 3.85 1_1.00 0.00 0.62 0.38 3.47 12 12.00 0.00 0.62 0.38 3.08 3 13.00 0.00 0.62 0.38 2.70 74 14.1-)0 0.00 0.62 0.38 2. 15 1 -5.00 0.00 0.62 0.38 1.93 16 16.00 0.00 0.62 0.38 1.54 17 17.00 0.00 0.62 0.38 1.16 18 18.00 0.00 0.62 0.38 0.77 19 19.00 0.00 0.62 0.38 0.39 20 20.00 0.00 0.62 0.38 0.00 Rivanna Engineering & Surveying, PLC Page 8 434) 984 -1599 Crozet Self Storage, SWM -1 Post - Development Hydrographs Name: DA -M 10 Yr Peak Flow (Qp)6.33 cfs) me _ , Pea' o_)8. CO min) 74me D_ Base - b,GJ. 0 m n 0.09 ac me Steo CC mir; rIIW Mu_iplier A ='fDR.OGRAPH 7NEORLM T10N' Reced -ng Limb Tactor APPROX STORAGE] Maximum Ou__`low 0.CC cfs) 4aximum Storage 0.09 cu ft) BASIN IN:OR.N!ATION; WEIGHTED WATERSHED AREA] Descrlction Area CN Runoff Coef None> Overa ;I Accro.rimation 1.40 NA 0.70 TIiy?7 COIICENTR :'TIOPJ -- User Defined] Time of Concentration (T'c)8.00 (min) RA7NFALL DESCRIPTION] Distribut'on Type = Synthetic Total Precipi *_anon = 0.85 (in) Return Period = User Defined (yr) Storm Duration = 0.13 (hr) Rivanna Engineering & Surveying, PLC Page 9 434) 984-1599 Crozet Self Storage, SWM -1 Post - Development Hydrographs DA -M 10 Yr me __lcr °T:°_ ^=3L Cll:'i',_ ve _ncremenP 31 - 3i; 23-- R3=_. f 311 Ou!flow Outflow TG y i S) Rivanna Engineering & Surveying, PLC Page 10 434) 984 -1399 2.0 0.__21 0.79 5d 3 3.00 C.32 0.79 3 4 4.'0 0.11 0.43 0.79 3.16 5 5.00 C.'_0.53 0.79 3.96 6 6.00 C.L 0.64 0.7 9 4.75 00 0.11 0. 5 0.79 5.54 8 8.00 0.11 0.85 0.79 6.33 9.0.'"0 0.85 0.53 1.30 00 3.00 0.85 0.53 5.28 00 0.00 0.35 0.53 4.1 12 13.00 0.00 0.35 0.53 4.22 13.00 0.00 0.85 0.53 3.69 i4 14.00 0.00 0.85 0.53 3.17 15 15.00 0.00 0.85 0.53 2.64 16 15.00 0.00 0.85 0.53 2.11 0.00 0.85 0.53 1.58 13 17.00 0.00 0.85 0.53 1.06 19 19.00 0.00 0.85 0.53 0.53 20 20.00 0.00 0.85 0.53 0.00 Rivanna Engineering & Surveying, PLC Page 10 434) 984 -1399 Crozet Self Storage, SWM -1 Post - Development Hydrographs am.e : Type . f ROGRI.PH T IFOR ^A rO ^I; DA -M 100 Yr pied F.ationai Peak Flow (Qp)8.99 cfs) me __ yea _8.00 Distribution Type 2C.00 mi 1.21 in) ac - ft) me yr) Storm Duration low Mui:_pir__C PaTIONAL H "_'DRCGRAPH =NFCRNIAT1ONj low `Iultic_ier 1 . 00 Receding L'imb Factor STCRaGE] Maximum Out flow 0.00 c- *s) Maximum Storage 0.12 cu it, 3AS1N INFCR_MA'1CrI] WEIGHTED WATERSHED AREA] Description Area CN Runoff Coef Ione> Overall Approximation 1.40 NA 0. TIME CONCENTRATION -- User De fined] Time of Concentration (Tc)3.00 min) RAINFA 7 I DESCRIPTIOPI] Distribution Type Synthetic Total Precioitation 1.21 in) Return Period 100 yr) Storm Duration 0.13 r) Rivanna Engineering & Surveying, PLC Page 11 434) 984-1599 Crozet Self Storage, SWM-1 Post-Development Hydrographs DA-M 100 Yr HydrDqfacr Flow V awes T:rLe vs.Flcw Me ncremen'='ar 4 v e nc_-.raenzal 1 .__e val Out 0 W cfs) C . 0 0 00 1.12 0. 30 1.12 3 3.00 D.1.-3.37 4 4.30 0.1 1.4.50 5.00 0.15 0.76 1 5 .62 6 6.30 0.6.75 7I . n rj 0 .--or,1. 12 87 8 8.00 0.15 1.21 1.12 8.99 O. 00 1.21 10 . 0 (1 0.00 0.75 7 0 0 . rIO 1.0 .75 6.75 0(1 0.00 0.75 6.00 13 J-)0.00 0.75 5. 25 14 14.00 0.00 1.21 0.75 4.50 5 15. 00 0.00 1.2 0 .75 3.75 16 16.00 0.00 1.21 0.75 3.00 7 17.03 0.00 1.21 0. -7 18.00 0.00 0.75 1 .50 9 19.00 0.00 1.21 0.75 0.75 20 20.00 0.00 1.2 0.75 0.00 Rivanna Engineering & Surveying, PLC Page 12 434) 984-1599 Crozet Self Storage, SWM-1 Pond Report Name: Crozet Self Storage SWIM-1 47 7' Rivanna Engineering & Surveying, PLC Page 13 434) 984-1599 6 3.ft) N. ' axim,m. ev a r ncremen Dr -e Mer-'nc(-i: Wiser-Def-'ned Storage cut Me7-'-od: Area lumber E L ev a cn r.rea A77e Area 0'-U me V sc so ft)U Lt)cu ft) 1 623.80 0.00 0.00 0.00 0.00 2 52 128.90 914-00 192.80 182 80 3 625.00 1450.'j0 1639.00 1639.00 1821.80 4 625.50 2995.30 1111.25 2933.05 5 626. 4995.00 3995.00 199;.4930.55 DISCI' ',C ,,jAT7rA -E 7N FOR Structure Number: I Type: Name: Crozet Self Storage SWY-1 RESERVOIR STAGE STOP-AGE/D E I a - L - or. Stage Area Storage Discharge z': ( , )s a it)Cu f c f s 624.20 0.40 540.84 0.15 62 0.80 1601.20 1211.56 1.21 625.30 1 1821.80 7.85 625. 1.60 2 3 0 0 2649.00 3.96 625.3' 7 4i95.00 401'I.55 5.99 Maximum Storage 4930.j- 7 5 f cu z) I -Ia X iscnar-6.52 c r° Rivanna Engineering & Surveying, PLC Page 13 434) 984-1599 Crozet Self Storage,SWM.1 Pond Report T:SS :3222 2 :2:2: 2»e±a z :esa :Ice tax:m1 z :eca =» =s 2:e ac»ao :sc =,sect 623.3 ;t :) e2e.J: :tt! 32232 2 :7z :9z2 w2:22] SK :7 :2z 9mS w2 : ?S1 2:ame:e« E ec2: <e < =es: C=:«:ce 2ce«£:c y =azc2csa: Cpea 7eeg2x en Area = 2.6: 2R :7123 EQUAT:CNI se -2: :276) /'k 0.: 2E72x:2:2M3] 2= = C::ttee coeff::fen% 2 = wetted Afea, :s2 tc; WEIR :x32 SCI :cKI crest Eleva :ion = 62:.60 (z%) Weir Coefttciest = 3.11 E,cocenttai = :.50 WE -R E2 2122] 2 = C * 1 a`ez2 2zz2S:2:Sns! 2w = We-!-- Ccetvtc:ecc E = Headwater depcx above inlet coet=ol section lave :t tt a = crest length tt a222cG C2 :xlcz :3FO wT :2M] Type : Cifcula« Orifice C22:DG1 c._. =z :SZC w2 :CO: D :,mete= zce=: E :esa ::=z = 622.80 (ft; CU22zT 22x22T22z 2zsOR? Na ar s« Cces ±z7s = : C9 :3 :2z 362«2 S; z -and 2»-e Crozet Self Storage sWM-1 Rivanna Engineering & Surve PLC rag 14 93ƒ98 -1399 Crozet Self Storage, SWM -1 Pond Report 3E: I`iITICNS] CC = Or_fi__ Coefficient ea, (cfs ) ti = CJL`JERT INFORN?ATION; Tire . ,_ r _._ar C r. rete - _ a ° EdgP wi_.. eadwal_ OUTLET STRUC' U ?E T" .O,R2%a_T -0N; cfs) Diameter cfs)cfs Inver- Elevation 621.00 ft) Pi Length 50.00 ft) Slope 0.01 624.50 mannir.g's n , ua 0. Cl 1.67 Cr_fice Coe ffic_e „-0.60 0.87 lwater Elevation 624.36 ft Number of Barrels 0.41 ur1SUBN ?ERGED EQUATION] D 4 am = He /Dram .{(Q /(A *Diam ^0.5)) ^M- ^v.5 *S Coefficient K = 0.01 Coefficient M = L.00 Q L?ax:mum = 4.80 SUBMERGED EQUATION; H /Diam = c *(Q /(A *Diam ^0.5)) ^2 +`f -0.5 *S Coefficient c = 0.04 Coefficient Y = 0.67 Q Minimum = 5.49 DEFIN: IONS, H = Headwater depth above inlet control section invert_, (ft) Diam = Interior height of culvert barrel, (ft) He = Specific head at critical depth (dc +Vc ^ 2/2g), (ft) Q = Discharge, (cfs) A = Full cross sectional area of culvert barrel, (sq ft) Culvert barrel slope, (ft /ft) STAND PIPE STAGE VS. DISCHARGE] Elevation Stage Weirs Orifices Stand Pipe Culvert _Tota OUTLET STRUCTURE REPORT W'IR STAGE VS. DiSCH R.E 4 ----- ________on Stage Weir 1 Weir 3 Weir Rivanna Engineering & Surveying, PLC Page 15 434) 984 -1599 cfs)cfs)cfs)cfs cfs) 6 4.10 0.30 O.00 0.37 0.00 0.04 0.04 624.50 0.70 0.09 1.67 0.00 0.87 0.87 24.90 1._1 0.00 2.93 C.00 0.41 4I 6 5.30 1.50 0.00 3.78 0.00 4.16 3.78 65.70 i.90 0.00 4.47 1.23 5.71 5.70 W'IR STAGE VS. DiSCH R.E 4 ----- ________on Stage Weir 1 Weir 3 Weir Rivanna Engineering & Surveying, PLC Page 15 434) 984 -1599 Crozet Self Storage, SWM -1 Pond Report S. 1_SCHAK.GE i -7 _ ..S _a Ori ce 1 Or _ -e 2 Or - ' 14 ce 3 0riiI Ce 6 a._J. 3 i; .;.0 0.00 C.0 0.0c 0.00 j G O 0 0 624.90 1 0.00 0. ^.0 0.0C 0.00 0.00 0_5.30 0.00 0 ID 0.00 0 00 G.GG J. '_'J JC 0.0 0.'.i0 0 CII u0 S. 1_SCHAK.GE i -7 _ ..S _a Ori ce 1 Or _ -e 2 Or - ' 14 ce 3 0riiI Ce 4 _otai it)7)CiS)cis;cfs lcrS;cfs 624.10 0.30 0 37 0.00 0.00 0.00 0.37 624.50 0.70 1.67 0.00 0.00 0.00 1 .67 624.90 0 2.93 0.00 0.00 0.00_'.93 30 50 3.78 G.30 0.00 0.00 3.18 625.70 1.90 4.47 0.00 0.00 C.00 4.47 Rivanna Engineering & Surveying, PLC Page 16 434) 984 -1399 Crozet Self Storage, SWM -1 Routed Hydrographs Name: DA -M 2 Yr Rtd Type. c.ese_voir. Modified P,_1s DR.OG APu I?1F0R_r.TIOri' 1 Peak Flow (Qp)2.29 (cfs) Time -,) Pea,1 . 0 C (m n) ime o Rase 'Tb)1-31.00 ;_n'n Vo -ume 0.06 (ac-f Time Step 1.00 ;m ~; Peak Elevat -Oon 6124 .87 (c ) Deten ior. __me NA RFSFR'iOIP. STRUCTf:R- I:iFOP.MATION] Number 1 Name Crozet Self Storage SW:?- Storage Tyne User-Defined Area Maximum Storage 4930.55 (cu f_) Max 4m um Discharge 6.52 (cfs) NFIOW HYDROGRAPH IN -TON] Number Name DA -M 2 Yr Peak =low (Qp)4.62 (cfs; Time to Peak (To)8.00 (min) Time of Base (Tb)20.00 (min) Volume 0.06 (ac -ft) Flow Multiplier 1.00 EQUATION] I 4 (2 '-) - 01 = (2(S2) /dt) +02 Where: I1 = Previous inflow I2 = Current inflow S1 = Previous storage S2 = Current storage dt = _ime increment CI = Previous outflow 02 = Current out-Flow A = (Ii I2) B = (2 (Si) / dt) - 01 C = (2 (S2) / dt) + 02 Rivanna Engineering & Surveying, PLC Page 17 434) 984-1599 Crozet Self Storage, SWM -1 Routed Hydrographs DA-M.2 -Yr Rtd on T1L ' '1 __Js;0 Dc_°_ C ti___dIGP_P MT et :'-c0' 1.. . w a B C fl Dw r 7qP lev s)s;is;cis r's; 1.110 G.Sd 58 C. G 34.64 G.32 623.8' 2 C .,1-3 3 139.4 6 -62 2 3 3.30 1.13 89 38.54 311. 2 0.00 153.36 623.38 4.CC 2 .31 04 3'_ -.7 552.9=0.02 2 -5.47 624.05 5 3.'100 x.89 5.20 552.9 358.39 0.03 423.2_624._4 6 6.00 3.46 6. 35 853.39 1220.72 0.43 610.47 624.24 7 4.34 50 1220. 2 1623.52 0.48 814.510 624.36 3 OG 4.62 3.6+3 028.52 2068.32 0.85 034.53 524.49 9 9.100 4.23 3.85 2068. 7 2472.16 1.47 1_36.,_624.02 0 0.00 3.85 08 24 2732.13 1.64 391.39 624. 11 1.00 3.4 7.32 2782.13 3006.05 1.34 1503.99 624.79 12 12.00 3.08 6.55 300E.C5 3154.08 2.14 1578.11 624.84 13 13.00 2. -0 5.78 3154.08 3236.83 2.26 1619.54 624.86 14 14.00 2.31 5.01 3236.83 3264.20 2.29 1633.25 624.87 15 15.00 1.33 4.24 3264.20 3244.30 2.27 1623.53 624.37 16 16.00 1.54 3.47 3244.90 3185.8E 2.18 1594.02 624.85 17 17.00 1.16 2.70 31 3093.51 2.05 1547.78 624.82 18 18.00 0.77 1.93 3093.51 2972.55 1.89 1437.22 E24.78 19 19.10 0 0.39 1.16 297 .55 2826.64 1.70 1414.17 624.73 20 20.00 0.00 0.39 2826.64 2658.61 1.49 1330.05 624.67 21 21.00 0.00 0.00 2658.61 2491.88 1.29 1246.58 624.62 22 22.00 0.00 0.00 2491.88 2346.58 1.13 1173.86 624.58 23 23.00 0.00 0.00 2346.58 2218.94 1.00 1109.97 624.54 24 24.00 10.00 0.00 2218.94 2106.33 0.88 1053.60 624.50 25 25.60 0.1 G 0.00 2106.33 7006.17 0.79 003.48 624.47 26 26.00 0.00 0.00 2006.17 1916.24 0.71 958.47 624.45 27 27.CG 0.00 0.00 1916.24 1835.44 0.64 918.04 624.42 23 28.00 0.00 0.00 1835.44 17 0.57 881.69 624.40 29 29.00 0.00 0.00 1762.80 1696.83 0.53 843.68 624.38 30 30.00 0.00 0.00 1696.83 1636.33 0.48 818.40 624.36 31 31.00 0.GO 0.00 1636.33 1580.82 0.44 790.63 624.35 32 32.00 13.00 0.00 1580.82 529.91 0.41 755.624.33 33 33.00 0.00 0.00 1529.91 1"83.21 0.37 741.79 624.32 34 34."3 0."0 0.00 1483.21 1440.37 0.34 720.36 624.30 35 35.00 0.0'3 0.00 1440.37 1400.75 0.32 700.53 624.29 36 36.00 0.00 0.GO 1400.75 1363.E?0.30 681.97 521.28 37 37.00 1.00 0.00 1363.64 1328.76 3 664.52 624.27 38 38.00 O.CO O.GG 1 328.76 1295.9E 648. a 624.26 39 39.00'0.00 0.00 1295.9E 1265.12 0.25 632.69 624.25 4G 40.00 0.GO 0.00 1265.12 1235.13 0.23 618.18 624.24 Rivanna Engineering & Surveying, PLC Page 18 434) 984 -1599 Crozet Self Storage, SWM -1 Routed Hydrographs I a ma e : Type: Peak Flow (Qp) To T -7, e c ease ,T-b) Detention _ime DA-IM 10 Yr Rtd F .eservci mor:ji t Pu s Number Name S m -1 Storage Tyne Maximum Storage Maximum Disc ^arse INFLOW H'. ROGF--'PH 1N- 0RNIATiON Number Name Peak Flow (Qp' ime to Peak (Tc) Time of Base (Tb) Volume Flow Mu1t'_Dl ;er GQLt'T1N; 2(S2) /dt) +02 Where: Ii = previous inflow I2 = Current inflow Si = Previous storage S2 = C'lrrent storage dt = T_me ncrement 0. = Previous outflow 02 = Current outflow A = (T_ t 2 (Si) / dt) - Ol 2 (S2) % w 02 3.37 (cfs) 1233.00 ;mini r 627.13 (ttj NA Crozet Self -Storage User- Defined Area 4930.55 cu ft; 6.52 (cfs) 6 DA--M 10 Yr 6.33 (cfs) 8.00 (Tin) 20.00 (min) 0.09 (ac -ft) 1.00 Rivanna Engineering & Surveying, PLC Page 19 434) 984 -199 Crozet Self Storage, SWM -1 Routed Hydrographs DA -M 10 -Yr Rtd Comc1-a o-_of ?.es_-r O _ _.a a e o iicdifie Method T v n -r S,fS,S;li fl:) 47 0. 4 89.:89 JO 94.95 623.9'' 3.0 G 2.3,3.96 139.89 426.84 0.0 213.43 624.02 CO 6 5.54 426.84 755.c 0.05 37•.91 624.1 5 00 3.96 55.76 167.97 0.20 584.08 624.22 6 6.00 4.67.97 1548.43 0.49 824.46 524.37 7.00 5.54 10.29 1648.43 8.28 0.96 1089.62 624. 8 GO 33 11.8 2 78.28 737.34 1.58 1369.46 6- 3 2137.34 3 -734.53 2.`3 1618. 39 624.86 LO 1']•']=23 03 3234.33 3596.64 2.`'8 99.71 624.93 11 11.00 4.75 10.03 3536.64 3843.34 3.12 192 .23 625.06 i2 2.00 4.22 8.9 3843.34 3995.40 3.31 1999.36 3 13.2 3.69 7.92 3995.40 4069.61 3.37 236.49 625.13 14 14.00 3.17 6.86 4069.61 4076.71 3.37 2040.04 625.13 I]15 .00 2.64 5.81 4076.71 4022.73 3.33 2013.06 625._2 16 1 _6.00 2.11 4.75 4C22.78 3914.37 3.22 1959.05 625.09 1 7.00 58 3.70 39'14.87 3762.72 3.02 1882.87 625.04 18 18.00 1.05 2.64 3762.72 3575.37 2.75 1789.06 624.98 19 19.00 0.53 1.59 3575.37 3339.96 2.43 681.19 624.90 20 20.00 0.00 0.53 3359.96 3120.88 2.09 1561.48 624.82 21 21.00 0.00 0.00 3120.88 2888.82 1.78 1445.30 624.75 22 22.00 0.00 0.00 2888.82 2690.42 1.53 1345.97 624.68 23 23.00 0.00 0.00 2690.42 2519.37 1.33 1260.35 624.63 24 24.00 0.00 0.00 2519.37 2370.62 i6 1185.89 624.58 25 25.03 0.00 0.00 2370.62 2240.15 1.02 1120.59 624.54 26 26.00 0.00 0.00 2240.15 2125.04 0.90 1062.97 624.51 27 27.00 0.00 0.00 2125.04 2022.82 0.81 10 "1.8 624.48 28 28.00 0.00 0.00 222.82 1931.20 0.72 965.96 624.45 29 29.00 0.00 0.00 1931.20 1848.89 0.65 924.77 624.42 30 30.00 0.00 0.00 184'8.89 1774.92 0.58 887.75 624.40 31 31.00 0.00 0.00 1774.92 1707.88 0.53 854.21 624.38 32 32.00 0.00 0.00 07.88 1646.45 0.49 823 . 4 624.36 33 33.00 0.00 0.00 1646.45 1590.11 0.45 795..^8 624.35 34 34.00 0.00 0.00 1590.11 1538.43 0.4'1 709.42 624.33 35 35.00 3.00 0.00 1538.43 1491.03 0.38 745.70 624.32 36 36.00 0.00 0.00 149'.03 1447.54 0.35 723.94 624.31 2 37.00 C.0 0 G.G0 144 54 1407.41 0.32 703.86 624.29 33 38.00 0.00 0. 0 1407.41 1369.90 0.30 685.10 0'24.28 39 39.00 0.00 0.00 1369.90 1334.64 0.25 667.46 624.27 40 40.00 0.00 0.0G 1334.h4 301.49 0.27 650.624.26 Rivanna Engineering & Surveying, PLC Page 20433) 984 -1599 Crozet Self Storage, SWM -1 Routed Hydrographs DA -M 100 Yr Rtd jce. Ragori _. Modified Pu__ n''I- ROGRAP INFOPMATICN; I1 Peak Flow (Qp)4.12 cfs) Time -c Pea{ Ic!15.00 100 Yr ime of Base Tb)237.f] lo -1me r.1-'ac - f Time of Base (Tb)20.00 min) Pea'.{ LieV3ti'7^025.49 ft ) Lie _en on me NA R STR Iv OR -Ir ION] Ni -=cer = 1 Name Self St:.rage Storage Type = User-Defined Area Maxc' mum Storage = 4930.55 (cu ft ) rIa: {imam Discharge = 6.52 (cs INFLOW HYDROGR?.PH INFORMATION; I1 Number I2 game DA -M 100 Yr Peak Flow (Qp)8.99 cfs) Time to Peak (Tp)8.00 min) Time of Base (Tb)20.00 min) Volume 0.12 ac -ft Flow Multiplier outflow EQ[iATICNj IL +_2) (2 (S1)fdt) - 01 = (2(S2) /dt) +02 Where: I1 Previous inflow I2 Current inflow S1 Previous storage S2 Current storage t Time increment C1 Previous outflow 02 Current outflow A = (11 + r2) 2 (Sl) / dt) - 01 C = (2 (S2) / dt) + 02 Rivanna Engineering & Surveying, PLC Page 21 434) 984-1599 Crozet Self Storage, SWIVI-1 Routed Hydrographs DA-M 100-Yr Rtd Compurati=of Reseruoir Outflow Table Df Modified Puls Method iniv Time nflow A B c Ou7flow Storage Ele-: min)lcfs) I cfs)WA)fs)cfs)WU ft;ft) 1 1.10 1.12 1.12 0.3c 6 0.10 33.73 623A 2 2.20 2.15 3.37 6 263.52 VA 134.91 623.9 3 3A 3.37 5.62 269.82 605.4 C.0 302.75 624.07 4 4.30 4.30 7,87 605.47 l066.94 0.15 533.54 624.20 5 5.90 5.62 10.12 1066.94 1635.74 0.43 818.11 624.36 6 6.00 6.75 12.37 1635.74 2284.23 1,07 1142.65 624.56 7 7.00 7.87 14.61 2284.23 2982.06 1.90 1491.98 624. 8 3.00 8.99 16.86 2982.C6 3702.52 2.93 1852.73 625.02 9 9.00 8.25 17.24 3702.52 4345.07 3.59 2174.33 625.20 is 10.00 7.50 15,75 4345.07 4846.27 3.80 2425.04 625.31 11 11.00 6.75 14.25 4846.27 5236.21 3.94 2620.07 625.39 12 12.00 6.00 12,75 5236.21 5522.21 4.04 2763.12 625.44 13 13.00 5.25 11.25 5522.21 5709.30 4.09 2856.70 625.4 14 14.00 4.50 9.75 5709.30 5801.29 4.12 2902.71 625.49 15 15.00 3.75 8.25 5801.29 5801.65 4.12 2902.89 625.49 i6 16.00 3.00 6.75 5801.65 5713.73 4.09 2858.91 625.47 17 17.00 2.25 5.25 5713.73 5540.76 4.04 2772.40 625.44 18 18.00 1.50 3.75 5540.76 5285,87 3.96 2644.92 625.40 19 19.00 0,75 2.25 5285.87 4953.14 3.84 2478.49 625.33 20 20.00 0.00 0.76 4953.14 4547.69 3.68 2275.63 625.25 21 21.00 0.00 0.00 4547.69 4122.96 3.41 2063.13 625.14 22 22.00 0.00 0.00 4122.96 3739.65 2.98 1871.32 625.03 23 23.00 0.00 0.00 3739.65 3410.73 2.51 1706.62 624.92 24 24.0 0.00 0.00 3410.73 3134.11 2.11 1568.i1 624.83 25 25.00 0.00 0.00 3134.11 2999.94 1.80 1450.87 624. 26 26.00 0.00 0.00 2899.94 2700.00 1.54 1350.77 624.69 27 27.00 0.00 0.00 2700.00 2527.68 1.34 1264.51 624.63 28 28.00 0.00 0.00 2527.68 2377.88 1.16 1189.52 624.59 29 29.00 0.00 0.00 2377.88 2246.56 1.03 1123.79 624.55 30 30.00 0.00 0.00 2246.56 2130.69 0.91 1065.90 624.51 31 31.00 0.00 0.00 2130.69 2027.85 0.81 1014.33 624.43 32 32.00 3.00 C.00 2027.85 1933.0.968.23 624.45 33 33.5C C.00 0A0 1935.72 1852.95 0.65 926.80 624.43 34 34.00 0.00 0.00 1832.95 1778.57 0.59 839.58 624.40 35 35.CC 0.00 0.00 1778.57 1711.19 0.54 853.86 624.38 36 36.00 0.00 0.00 17i1.19 1649.49 0.49 824.99 624.3 37 37.00 0.00 0.00 1649.49 1592.90 0.45 796.68 624.35 38 38.00 0.00 0.00 1392.90 1540.99 0.41 770.70 624.33 39 39.00 0.00 0.00 1540.99 1493.37 0.38 746.88 624.32 40 40.00 0.00 0.00 1493.37 1449.69 0.35 725.02 624.31 Rivanna Engineering & Surveying, PLC Page 22 034) 984-1599 Crozet Self Storage, SWM -1 Uncontained (Existing) Hydrographs ante T'ne DA -Ni 2 Yr Modified Peak Flow (Qp)8.02 cfs) tee - =e o;3.'D0 1.40 0 20.00 min) 0.33 0 0.25 Grass 0.64 0 2.52 F- TIOr;A_ H yDROGRAPH !NFOR.M.TION', 0.68 CONCENTRATION -- User Defined] w 1.00 R.ece :_. - --mb Fac _or 50 8.00 (min) aXtmlim 'illtf10W 0.00 CtS) Maxi-mllrn Storage 0.I1 Cli Tt) BASI`; i:JEORMi.TICN; WEIGHTED WATERSHED AREA] Descr'ction Area CN Runo'r Coe Buildings 0.15 0 0.90 Pavemer_t 1.40 0 0.90 Woods 0.33 0 0.25 Grass 0.64 0 0.35 0-vera_l Appro: {_ma`_ior.2.52 NA 0.68 CONCENTRATION -- User Defined] Time of Ccncentration (Tc)8.00 (min) RATNFA!L DESCRIPTION] istricution ype = Synthetic Total Prec atir, = 0.62 (in) atllr Dori Jd = 2 (yr) Stcrm Duration = 0.13 (hr) Rivanna Engineering & Surveying, PLC Page 23 431) 984 -1599 Crozet Self Storage, SWM -1 Uncontained (Existing) Hydrographs DA -N1 2 Yr ime i1?"?Rle _ ^_`_a1 C'.iiT!1 1 a z i e C?rr em Pr. t I Des i - - n Rainfall Rainfall 0 1:tfIow Olir_1ow m JU u.,JB 0.00 2.00 3 3.'0 0.08 0.23 1.00 3.0 4. 0 0.08 0.31 00 4.01 5.J0 0.08 0.39 1.00 5.01 6 6.]0 0.08 0.47 00 6.01 7 7.00 0.08 55 00 7.02 8 8.00 0.08 0.62 1.00 8.02 9 9.00 J.00 0.62 0.67 7.35 10 0.00 0.00 0.62 0.67 6.68 1 GO 0.00 0.62 0.67 6.02 12.00 0.00 0.62 0.67 5.35 i3 3.00 0.00 0.62 0.67 4.68 14 1-?.00 0.00 0.62 0.67 4.01 i5 15.00 0.00 0.62 0.67 3.34 16 16.00 0.00 0.62 C.67 2.68 7 17.00 0.00 0.62 0.67 2.01 18 18.00 0.00 0.6'0.67 1.34 19 19.00 0.00 0.62 0.67 0.67 20 20.00 0.00 0.62 0.67 0.00 Rivanna Engineering & Surveying, PLC Page 24 434) 984 -1599 Crozet Self Storage, SWM -1 Uncontained (Existing) Hydrographs lame: DA -Nl 10 Yr vice CQ1L =e fat . 3 Peak Flow (Qp) = 10.99 (cfs) IOi me = 0. aC - f i'me Stec 13W Rr1T:ONF.L H =CGRAPH INFOpd%Ln,TTotJ' ow _Iul ._p1_er = IO Receding Limo _actor A PRG: {INS STORAGE; Maximum 0 1 i __1ow a:simum S =orage (cu tt) 3ASIN INE0R "'vA7:ON] WEIGHTED WATERSHED AREA' Description Area CN Runoff Ccef Buildings 0.15 0 0.90 avement 1.40 0 0.90 Wocds 0.33 0 0.25 Grass 0.64 0 0.35 Overall Apprcximat 2.52 IA 0.68 TI`4E CONCENTRATION -- User De tined] Time o Concentraticn (Tc)8.00 (min) RAINFALL DESCRIPTION] Distribution. Type = Synthetic Tc -a1 ?recipita_ ion = 0.85 (in; P,er,_rn __iod = User Defined (yr) Storm Dura-i or. = 0. 13 (hr) Rivanna Engineering & Surveying, PLC Page 25 434) 984 -1599 Crozet Self Storage, SWM-1 Uncontained (Existing) Hydrographs DA-N1 10 Yr pl- FLI -7 V a -' e s im, e -, .r s ow 7 -ncremenrial mulat ive 7 C reme nt a 1 De S i gr i .00 0.00 I 7 0r,7 2 . 75 3 3.00 1.37 4.12 4. 00 0.i1 0. 43 1.37 5. 49 5 3 3 6.9 6.00 0.64 37 3. 24 1.37 9.62 8 8.00 0.11 0.85 1.37 10.99 9.00 O.30 0.35 10.08 10.00 0.00 0.85 9.16 11 11.00 0.00 0.85 0.92 8.25 12. 00 GO 0.85 0.92 7.33 13 13 0.00 0.35 11 . 92 6. 41 14 14 .00 0 .'00 0. 85 0.92 5.50 15 1 -5.00 0.100 0.85 0.92 4.58 16 16.00 0.00 13. 85 0.92 3.67 7 17.)(3 0.00 0.85 0.92 2.75 18 18 .00 0.00 0.85 0.92 1. 84 9 19.00 0.00 0.85 0.92 0.92 10 20.00 0.00 0.85 0.92 0.00 Rivanna Engineering & Surveying, PLC Page 26 434) 984-1599 Crozet Self Storage, SWM-1 Combined (Existing) Hydrographs a ,e:DA-Nl & DA--M Rtd 2 Yr combi-ed Z Peak Flow (Qp) =8.86 Cfs) me of Base (7b)23_.0 e -m I n iol , ame =0.17 ac-f'-) T 4 me Stec 1.00 Amin COMBINED HYDROGP?_PH RECORDS; H v r - I r c a r a c h N e r : 3 Name DA-N! 2 Yr Type: Modified Razicna.' Peak - (Qp)8.02 cis) T- to Peak (7c)00 Time --, Stec =i.cc min) Hvdr3crraph Numner: 8 Name: DA-M 2 Yr Rzd Type: Reservoir: Modified Puts Peak 71ow (Qp) =2.29 Cfs) Time to Peak (Tp)14.0()min me Stec =1.00 min) Rivanna Engineering & Surveying, PLC Page 27 434) 984-1599 Crozet Self Storage, SWM-1 Combined (Existing) Hydrographs DA-N1 &DA-M Rtd 2 Yr Combined Hy--: nter T i m e J 3 2.30 3.00 3.0 ! 4 4.00 5 51.00 5.09 6.- 00 7.49 8 8.00 8.86 9 8.61 0. JO 8.33 00 7.9:D 12.00 7.49 13 1 3.00 6.94 14 4.00 6.31 15.00 5.61 16.00 4.96 7 7.00 4 .96 18 8.00 3.23 19 19.00 2.37 20 20.00 1.49 21 21.00 1.29 2 22.00 1.13 23 23.00 1.00 24 2 0.88 s2 25.00 0.79 Rivanna Engineering & Surveying, PLC Page 28 434) 984-1599 Crozet Self Storage, SWM-1 Combined Hydrographs Type: INN-FOR,%LPkTIONI DA-N1 & DA-M Rtd 10 Yr comD-=eci Peak Flow (Qp) =12.57 cfs) T- to Peak (7C)n ie cf ease (Tt) Vol-=,e =0.23 ac-fr-) me S- z e c =cO m i !-I) ONIB71 ED HYDROGRAPH P. CORDS ! HydrograpIn Number: 4 Name: DA-NI 10 'I'r Yodif-`eci Ra*:ional Peak 7 - 1 ,Dw )Qp) =0.99 cfs) T, e to Peak (Tp) =3. 00 nin) Time Step =00 min) Hydrcqr-aph Number:9 Name: DA-Y 10 Yr Rtci Type: Reser-ioir: Modified Puts Peak Flow (Qp) =3.37 cfs) Time to Peak (Tp) =14.00 min) Time Stec =1.00 min) Rivanna Engineering & Surveying, PLC Page 29 434) 984-1599 Crozet Self Storage, SWM -1 Combined Hydrographs DA -N1 & DA -M Rtd 10 Yr PrVc_1'_me l..:L_:DW mid i rS 3 3 3.03 4.13 4 4.00 5.54 J.00 7 37 6 6.00 3.73 7.00 10.5 B 8.00 12.57 9 9.00 1 33 12.00 10.64 13 13.00 9.78 14 14.00 8.87 15 15.00 9i 16 16.00 6.89 i 7.00 5.77 18 8.00 4.59 19 19.00 3.35 20 20.00 2.10 21 21.00 78 22 22.00 53 23 23.00 1.33 24 24.00 1.16 25 25.00 1.02 Rivanna Engineering & Surveying, PLC Page 30 434) 984-1399 Crozet Self Storage, SWM -1 Uncontained (Proposed) Hydrographs Name Tvoe: YDR.OGR =. ?:: = V-ORs ?T 10 bi; DA -N2 2 Yr Modified R.at_ona1 Peak Flow (Qp)7.27 cfs) 0.90 Pavement 0.88 e of Rase Tci 2C.00 mi. ) 0.33 0 0.25 T me Step 1.00 min_) Flow Muitip_ier Overall Approximarion 2.52 R .TIOT ?? i''DRnGR1aR jyj- 0R^;_1IONI 0.51 low Multioi -er 1.00 P.eced ng Limb Factor i. PROXIMATE STORAGE] Maximum Outflow 0.00 cfs) Maximum Storage 0.10 cu ft) 3AJ N :VCOR.M;? ON WEIGHTED WATERSHED AREA] Descriotion. Area CN Runoff Coef Buildings 0.38 0 0.90 Pavement 0.88 0 0.90 Woods 0.33 0 0.25 Grass 0.93 0 0.35 Overall Approximarion 2.52 NA 0.51 IMF CONCENTRATION -- User Defined] Time of Concen tration (Tc) = 8.00 (min) RAINFALL DESCRIPTION] Distribution Type = Synthetic Total Preclpl:a'lon = 0. 62 ('n) Return Period = 2 (yr) Storm Duration = 0.13 (hr) Rivanna Engineering & Surveying, PLC Page 31 434) 984 -1399 Crozet Self Storage, SWM-1 DA-N2 2 Yz Zrngrap low vs_ es:i1- I r-2.mecca I7,cremenl Desigr, ntef"al acl aioall Ouco*0ucf 10 I l.CO CO 98 CO0 9I 2 C0 0.C6 C.16 0.91 3 3 .00 0.03 0.23 J.91 2.7 4 4.0 0.98 0.31 0.9l 3.63 5 O0 0.03 0.39 0.9 4.54 O47 0.9I 5.45 7 C8 0.55 0.9I 6.36 8 8.08 0.08 0.62 0.91 7.27 1 -2 12.90 0.00 0.62 0.6I 4.85 1 -3 13A0 0.00 0.62 0.61 4.24 14 l4.00 0.0 0 O.62 0.61 3.54 15 I5.00 0.00 0.61 3.03 5 l6 .g0 0.00 0.62 0.6I 2.42 l7 l7.00 0.O0 0.G2 0.6I I.S2 ig 18.00 0.00 0.62 0.6I I-2I 9 I9. O 0.00 0.62 0.6I 0. 61 20 20.00 0.00 O.62 0.6I 0.00 0UvuooaEngineering & Surveyi PLC Pane 32 434) 984-1599 Crozet Self Storage, SWM -1 Uncontained (Proposed) Hydrographs Name: Type: DA -N2 10 Yr i'.odif_ed Rational Peak Flow (Qp)9.96 cfs) me -D Pea'{ _B.OG mir\ l:,e 0 7::Gise Ttt l n 0.90 me Stec 00 m1 n) 10W RATIONAL HY T-NFORY- TION] 0.93 0 Flow Mui iclier 1.00 Receding Limb Factor 1.50 NA APPROXI"?A_1'7- STORAGEE , Maximum Ou -flew 0.00 cfs) Maximum Storage 0.cu f 3ASIN INFORM -ATION - WEIGHTED WATERSHED AREA] Description Area CN Runoff `'oef Buildings 0.38 0 0.90 Pavement 0.88 0 0.90 Woods 0.33 0 0.25 Grass 0.93 0 0.35 Overai'_ Approxima -ion.2.52 NA 0.61 TIME CONCENTRATION -- User Defined] Time of Concentration (Tc)8.00 min) RAINFALL DESCRIPTION] Distribution Type Synthet c To -a- Precipita -ion 0.85 in) P"'r^ Period User Defined (yr) S -orm Duration 0.13 hr) Rivanna Engineering & Surveying, PLC Page 33 334) 984 -1599 Crozet Self Storage, SWM -1 Uncontained (Proposed) Hydrographs DA -N2 10 Yr t2_' ial c.a_nfa__a_nfalI sutil ;'W GL:1f, 041 In S)cc LS. 1.00 0.0._x.00 1.24 J. 1 0.21 24 2.49 3.00 0.11 0.32 1 .24 3.73 4 4.00 0.11 0.43 1.24 4.98 5.00 x.11 0.53 1.24 5.22 6.00 0.64 1.247I0CP 8 8.00 0.11 0.85 1.24 9.96 9 0 0.00 0.85 0.83 9.13 10.00 0.00 0.85 0.83 8.30 11.00 0.00 0.85 0.83 7.47 L 1 _2.00 0.00 0.85 0.83 6.64 13 3.00 0.00 0.85 0.83 5.81 14 14.00 0.00 0.85 0.83 4.98 i5 15.00 0.00 0.85 0.83 4.15 16 16.00 0.00 0.85 0.83 3.32 1?11.00 0.00 0.85 0.83 2.49 18 13.00 0.00 0.85 0.83 1.66 19 19.00 0.00 0.85 0.83 0.83 20 20.00 0.00 0.85 0.83 0.00 Rivanna Engineering & Surveying, PLC Page 34 434) 984 -1399 Crozet Self Storage, SWM-1 Combined (Proposed) Hydrographs 7 am, e : DA-N2 & DA-M Rtd 2 YrI Yce: COQ- -nedb4 Peak Flow (Qp)8.11 cfs) ne tc Peak 'Tc 7,e of Base TID)1231 . 01 e 0' . 16 ac -f7: Time Step 1.00 min) FCOM3:NED HYDROGRAPH RECORDS] Ply Number.3 Name:DA-N7 Ype:Modified Rational Peak Flow (Qp)7.2'cfsi T LT. e —3 Peak 9.00 me Step 1.00 min) Hyrdragraph Nurnter:8 Name:DA-M 2 Yr Rtci Type:Reservoir: Modified Puls Peak Flow (Qp)2.29 cis) m to Peak (T 14.00 min) me Stec 1.00 Rivanna Engineering & Surveying, PLC5 Page 35 43 3) 984-1599 Crozet Self Storage, SWM -1 Combined (Proposed) Hydrographs DA -N2 & DA -M Rtd 2 Yr C DrnD1R?l Hy rogr3 ?: Flow Values Rivanna Engineering & Surveying, PLC Page 36 434) 984 -1599 J C S) 9 1 4 4,00 3.67 5 5.00 4.62 6 6.00 5.68 7 GO 6.84 8 8.00 8.11 9 9.03 93 0 10.00 70 L'II.00 7.39 1 12.00 6.99 3 13.00 6.50 14 14.00 5.93 15 15.00 5.30 16 16.00 4.61 1 i .00 3.87 8 18.00 3.11 19 19.00 2.31 20 20.00 1.49 21 21.00 1.29 22 22.00 1.13 23 23.00 1.00 24 24.00 0.88 25 25.00 0.79 Rivanna Engineering & Surveying, PLC Page 36 434) 984 -1599 Crozet Self Storage, SWM-1 Combined (Proposed) Hydrographs Name 7yce DA-N2 & DA-M Rtd 10 Yr 70mhined Rivanna Engineering & Surveying, PLC Page 37 43 3) 9844599 Peak Flow (Qp) =11.54 cfs) 9.00 m me of 3ase ;33 0 VC!'-:me =0.22 ac-fl-) T,e Stec 00 min) COMB 7J17D H fDROGRAPH R7CORDS] Hydrograph. Number: 14 Name: DA-N 10 T ype: Modified Rational P e ak Flow (Qp) =9.96 cfs) 7 -.me t- - 3 Peak (7c) =8.00 Time Stec 1.00 m- Hydrograpi Nurnber:9 Name: DA-M 10 Yr Rtd I —Type: Reservoir: Mod Puffs Peak Flow (Qp) =3.37 cfs) Time to Peak (Tc) =14.00 min) Time Stec =1.00 min) Rivanna Engineering & Surveying, PLC Page 37 43 3) 9844599 Crozet Self Storage, SWM -1 Combined (Proposed) Hydrographs DA -N2 & DA -M Rtd 10 Yr Combined -ivdI -graph Flow 'ia_.es Rivanna Engineering & Surveying, PLC Page 38 433) 984-1399 T.in f J0 19 3 3.00 3. - 4 4 00 5 .' 3 5 5.00 6.4 6 6.00 x.96 7 00 9.6 8 8.00 11.54 9 9.00 11.39 11 00 10.60 12 12.rD0 9.i5 13 13.00 9.13 11 14.00 3.36 S 15.00 7.48 16 16.00 6.54 1 00 5.51 8 18.00 4.42 19 19.00 3.26 20 20.00 2.10 21 21.00 1.78 22 22.00 1.53 23 23.00 1 .33 24 24.00 1 ._6 25 25.00 1. 2 Rivanna Engineering & Surveying, PLC Page 38 433) 984-1399 it- p ASS ae- C AAJ 380 VI 11 l.So ccd r r- ,, ( - C- r o 4 st (F S 4 r., C3 g3s)t(s ^ j y3 0 29 - /Sna TA1 , , - fof - , , - ;Z CA o goW.vf, \"), - , 3s v . i-I.— S- t, 0 p l Sl 1 y / i Ile ri ksi 1