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HomeMy WebLinkAboutSDP200500093 Calculations 2006-03-06! 1irs, 1 HYDROLOGIC /HYDRAULIC CALCULATIONS FOR CROZET SELF STORAGE SWM_1 March 6, 2006 • 4 4 b 11' tb 1 11-1161 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 7�IFCP.N?ATION] -ow Muit' p I 'er P.ecea ..i -mp Factor = _. 1 APPPR: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) _ncrem�en-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 O f `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 = Max imum 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 »- 7 n�_. ,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) 74 me D_ Base - b, - GJ. 0 m n 0.09 (ac _me Steo = _.CC (mir; rI IW 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 Out flow 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 O ut 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 7 I . � n r j 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. 2 5 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 , - - 4 7 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 ^l u mb er E L ev a cn r.rea A77e Area ;0'-U me V (sc ----------- (so ft) U Lt) (cu f t) 1 623.80 0.00 0.00 0.00 0.00 2 52 1�28.90 914-00 192.80 182 80 3 625.00 1450.'j0 1639.00 1639.00 1821.80 4 625.50 2 995.30 - 1111.25 2933.05 5 626. 4995.00 3995.00 199;. 4930.55 [DISCI' ',�C ,,jAT7r ' A� -E 7N FOR Structure Number: I Type: Name: Crozet Self Storage SWY-1 "RESERVOIR STAGE STOP-AGE/D ------------------------------------------------------------------------------- E I a - L - or. St a g e 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 1 2 1 1.56 1.21 6 25.30 1 _ 1821.80 7.85 625. 1.60 2 3 0 0 2649.00 3.96 625.3' 7 4i95.00 4 01'I.55 5.99 Maximum Storage 4930.j- 7 5 f cu z) I - I�a 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 4 m 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 'D c_°_ C , ti___d .'IG P_ 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 _'0 28.52 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'�T1�N; ;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 2 13.43 624.02 '.CO .6 5.54 426.84 7 55.�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 20 (43 3) 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'.{ L�ieV3ti'7^ = 025.49 ` ) f t ) 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 ) r ) `�Ia: {imam Discharge = 6.52 (c�s "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 !N FOR.M.TION', 0.68 [ CONCENTRATION -- User Defined] -w 1.00 R.ece :_. - --mb Fac _or = 50 = 8.00 (min) .`�aXtmlim 'illtf10W = 0.00 (CtS) Max i-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 D ori 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- F -- LI - - ,,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 . 7 5 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 - 1 0.08 10.00 0.00 0.85 - 9.16 11 11.00 0.00 0.85 -0.92 8.25 1 2. 0 0 (, . 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 1 5 1 -5.00 0.100 0.85 -0.92 4.58 1 6 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 A min� [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 T i me --, Stec = i.cc (min) Hvdr3crraph Numner: 8 Name: DA-M 2 Yr Rzd Type: Reservoir: Modified Puts Peak 7 1ow (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 �s 2 25.00 0.79 Rivanna Engineering & Surveying, PLC Page 28 (434) 984-1599 Crozet Self Storage, SWM-1 Combined Hydrographs T ype: [:� INN-FOR,%LPkTIONI DA-N1 & DA-M Rtd 10 Yr com�D-=eci Peak Flow (Qp) = 12.57 (cfs) T- to Peak (7C) n ---.ie cf ease (Tt) Vol-=,e = 0.23 (ac-fr-) _ -m e 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 Approx imarion 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 Approx imarion 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 �Z�rngrap� �low vs_ ��es: �i1- ----------------------------------------------------------------------- I r-2.mecca I7,cremenl Desigr, -ntef"al �a�c��l� �aio�all Ouc��o* 0ucf 10 ----------------------------------------------------------------------- I l.CO -CO �.98 C�O0 �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 1.247 I 0 C P 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 Yr I - Yce: COQ- -ned - - , b 4 Peak Flow (Qp) = 8.11 (cfs) -- ':ne tc Peak 'Tc --7,e of Base TID) = 1 231 . 01 e = 0' . 16 ac -f 7: 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, PLC �5 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 ?�: F low 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.S�o ccd r r- �,, ( �- C- r o 4 st (F S 4 r�.�,� C3 g�3s)t(s ^ +- j y3 0 29 -� /Sna TA 1 , , - fo f - , , - � ;Z CA o goW.�v�f, \"), ���-� ���, 3s �v ✓���. i-I.— S�- t, 0 �p l Sl 1 y / i : Ile ri ksi � 1