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HomeMy WebLinkAboutWPO201700024 Plan - Stormwater WPO VSMP 2018-02-05 PROJECT MANAGEMENT SHIMP CIVIL ENGINEERING LAND PLANNING ENGINEERING December 13, 2017 Mr. Bobby Jocz Albemarle County Department of Community Development • r NT. S117 NIP r � 451.13 - Regarding: WPO 2017-00024 Chesterfield Landing Phase 2 f1 Stormwater Management Plan rr '" • Dear Mr. Jocz, Included in this packet are all stormwater-related calculations for Chesterfield Landing Phase 2. This project is a part of a 43 lot by-right subdivision, with 18 lots included in Phase 2. "' Phase 1 Management Strategy Recap From the initial concept of this project, Red Dirt Developments planned to develop TMP 56-35 as si Chesterfield Landing Phase 2 shortly after developing TMP 56-36 as Chesterfield Landing. This was taken into consideration on several fronts: land was swapped from 56-36 to 56-35 to allow more lots to be built on 56-35; a sanitary sewer was built near the adjusted boundary between the two parcels, with overlap of the utility easement to allow sanitary laterals to be installed; and the storm sewer was built to have capacity to carry additional flow from impervious area added in Phase 2. In Phase 1, stormwater quality and quantity were addressed through sheet flow to open space via two level spreaders: Spreader B and Spreader C. Spreader C treated runoff from an area that only included Phase 1 development, whereas Spreader B treated runoff from Phase 1 and an additional area that was to become Phase 2. Level Spreader B was always designed to treat runoff from both phases of development, but Virginia Runoff Reduction Method (VRRM)required that phosphorous treatment credit could only be claimed for the active development-thus nutrient removal was only computed for Phase 1. This is shown in in the section "Phase 1 VSMP Computations". However, to adequately treat the Phase 1 runoff, the drainage area to Spreader B was larger than the Phase 1 development area and included area from Phase 2. Due to this required excess area, the engineer included extra capacity for the runoff from a fully developed Phase 2 in the Spreader B design. Due to regulations, this additional Phase 2 runoff was not included in the Phase 1 VRRM phosphorous treatment calculations even though this spreader provided volumetric capacity for Phase 2. This is shown in "Phase 1 Storm Sewer Computations", which includes a full-size copy of the stormwater management plan with „s annotations indicating this assumed drainage area from Phase 2. APPROVED by thn:. Iberrtarli C:' Pty � . �3 �'9',': Cornrnurjity Ork,010re1Ont Date_ File_ �211� Phase 2 Management Strategy Phase 2 also utilizes sheet flow to open space as the primary stormwater treatment strategy.Two new level spreaders will be constructed to route runoff from the Phase 2 development into the adjacent stream in compliance with VSMP regulations. The first new level spreader,Spreader D, is designed not as a treatment method but as a way to convert runoff from 0.44 acres into sheet flow due to the lack of adequate ,. natural channels. This runoff, along with the rest of the Phase 2 development area, will be routed to the new Spreader E and to existing Spreader B,which were both designed to the VRRM standards set forth in 2013 BMP Specification No. 2. Since Spreader B had been designed to handle the excess Phase 2 area, but the Phase 2 area could not be claimed in the Phase 1 nutrient calculations, this Phase 2 area can now be tabulated for nutrient removal since the overall development now includes Phase 2. Furthermore, in the final subdivision design for Phase 2, both the inflow area and the peak flow rate to Spreader B is less than the original Phase 1 design. Thus, Spreader B does not require design amendments from the original approved plan. No The new Spreader E has a length of 25' and shall be installed within the first 50'of the stream buffer to convert the additional channelized flow from Phase 2 to sheet flow. This design is shown on Sheet C14 of �++ the associated VSMP plan. VSMP Compliance sui To simplify the stormwater management changes caused by the two phases of this subdivision, a new VRRM spreadsheet has been compiled that shows all managed drainage areas and treatment strategies for Phase 1 &2. According to this VRRM spreadsheet, the proposed strategy for both Phase 1 &2 meet water quality standards set forth by 9VAC-25-870-65. The use of sheetflow to open space with C/D soils allows the site to exceed phosphorus reduction requirements by 0.97 lbs/year. Channel protection requirements set forth by 9VAC-870-66 are adhered to through the use of sheet flow to open space. Flood protection requirements from subsection C(3) are satisfied because stormwater discharges into a mapped floodplain. If you have any questions or concerns about this calculation packet, you may reach Justin Shimp, P.E. at justin at shimp-engineering.com or by phone at 434-227-5140 ext. 3. r ,. Contents: Phase 1 VSMP Computations Phase 1 Storm Sewer Computations �• Phase 2 Computations: Post-Development Land Use and BMP Drainage Map VRRM New Development Spreadsheet 40 Storm Structure Drainage Map LD-229 Storm Drain Calculations LD-204 Stormwater Inlet Computations Level Spreader Design Spreadsheet Excerpt from NRCS Soils Report NOAA Precipitation Report orni 41. OW OW OW Phase 1 VSMP Computations 11111 MIS EMI 1111111 Mei as �� . ...�. r r.�r --awl r.o■ .r ilr�r �J 1r�r1 rC.� ■� um? roll / r \ �g�—� /� j uQ�M/318 / t � � ,/ //j)11I \ \ — N 1 \r N — � ., ) 4 1 Od TIN b� b^ / �� \ ' _ //�;i, �((� \� ��' ,/ 9 illElM C .tea '"��"�>A�"�>"�> ?. >�»`'? >9 v?:.»`:�o>?.. .. / /// i ' --•- _ \ I(ilii 009/ , / / •41 • '. ' •--- - ' ' '''‘:,'k 1'$1..r. .......- door-mi;"'T.. ,411-1.--, --....., ilipr 1 NN t \ E45i ,4 'r ; ►�� �•A�� •w�� '\•y ,XON NNN '• •• • •.. . •�o• ,•••.• ••' _____ r—N .r.>4` ,� , '. • -,�... 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Virginia Runoff Reduction Method New Development Worksheet -- v2.8_2O11Specs Site Data Revised April 2014 Project Name: Wayland's Ridge Date: 05/15/2015 data in ut cells _-. calculation cells constant values 1. Post-Development Project & Land Cover Information Constants , iAnnual Rainfall(inches) Target Rainfall Event(inches) 1.00 Phosphorus EMC(mg/L) 0.26 Nitrogen EMC(mg/L) 1.86 1 Target Phosphorus Target Load(Ib/acre/yr) _ 0.41 Ilt 0.90 Land Cover (acres) A soils B Soils C Soils D Soils _ Totals Forest/Open Space(acres) undisturbed, -°� protected forest/open space or reforested land 3.87 0.63 2.73 0.00 7.23 Managed Turf(acres)--disturbed,graded for yards or other turf to be mowed/managed 0.00 10.22 1.12 0.00 11.34 Impervious Cover(acres) 0.00 3.84 0.00 _ 0.00 3.84 Total 22.41 Rv Coefficients A soils B Soils C Soils D Soils - Forest/Open Space 0.02 0.03 0.04 0.05 Managed Turf 0.15 0.20 0.22 0.25 Impervious Cover 0.95 0.95 0.95 0.95 re Land Cover Summary Forest/Open Space Cover(acres) 7.23 "" Weighted Rv(forest) 0.03 %Forest 32% Managed Turf Cover(acres) 11.34 Weighted Rv(turf) 0.20 ons %Managed Turf 51% Impervious Cover(acres) 3.84 Rv(impervious) 0.95 - %Impervious 17% Total Site Area(acres) 22.41 Site Rv 0.27 '.. Post-Development Treatment Volume(acre-ft) 0.51 Post-Development Treatment Volume(cubic feet) 22,311 Post_Development Load(TP)(Ib/yr) 14.02 Post_Development Load(TN)(lb/yr , . t+t `1; ma Total Load(TP)Reduction Required(Ib/yr) 4.83 ono me w r. Am 22 liE E2 LP tz 21 IL ) | 1 \ } AV IL Ci mii ® !|i: § \ f f § §2|f \ flit 2 § § § q 7 II { {)/ 0 . 0 0 0 ! 't 4 `\ 0 0 _ 0 , 0 k }|- : 0 0 , _ , /6} ( - — :• i , w. � gƒ /5/amq j : s : : &Q } § ( 606, ■ f; , wew 6c | ! 0 u y § ) . ! !!b §: a __ — $q§© 2 6 6 6 6 6 0 . §§ § ! ! | 0 k -. ); ); g,3, ? (� 0 - _ - , :, 0 « : \j q :i h H !: || | \ ` f f >! !! ! !! ;! !! .- ); !$ ]; ); !; ); |e § Yi k ' r r g g as ) r cc :! ) Pi `LI ; 'diE- § | %(\R �({(m! { k ! /( \! H |` al fi \ (0as 2 5 .5 / / 1 2k 2�1'1 Vil —\— | ° — \ alUs' k• § E; ; ; :; § i>] 1 P is |n£ { | y! — ! ${ 0! §!#^ O 2 !/f A" ) } o! o! Virginia Runoff Reduction Method Worksheet Virginia Runoff Reduction Method New Development Worksheet--v2.8_2011Specs - Site Data Summary Total Rainfall= 43 inches Site Land Cover Summary A Soils B Soils C Soils D Soils Total %of Total Forest(acres) 3.87 0.63 2.73 0.00 7.23 32.25 Turf(acres) 0.00 10.22_ 1.12 0.00 11.34 50.61 Impervious(acres) 0.00 3.84 0.00 0.00 3.84 17.14 22.41 100.00 Site Rv 0.27 Post Development Treatment Volume(ft3) 22311 Post Development TP Load(Ib/yr) 14.02 Post Development TN Load(Ib/yr) 100.28 Total TP Load Reduction Required(lb/yr) 4.83 Total Runoff Volume Reduction(ft3) 9020 Total TP Load Reduction Achieved(Ib/yr) 6 Total TN Load Reduction Achieved(lb/yr) 81.00 Adjusted Post Development TP Load(Ib/yr) 8.36 Remaining Phosphorous Load Reduction(Lb/yr)Required 0.00 Drainage Area Summary D.A.A D.A.B D.A.C D.A.D D.A.E Total Forest(acres) 0.00 0.00 0.00 0.00 0.00 0.00 Turf(acres) 9.22 0.00 0.00 0.00 0.00 9.22 Impervious(acres) 3.27 0.00 0.00 0.00 0.00 3.27 12.49 Drainage Area Compliance Summary D.A.A D.A.B D.A.C D.A.D D.A.E Total TP Load Red.(Ib/yr) 5.66 0.00 0.00 0.00 0.00 5.66 TN Load Red.(Ib/yr) 81.00 0.00 0.00 0.00 0.00 81.00 a Summary Print a Virginia Runoff Reduction Method Worksheet f11a Drainage Area A Summary Land Cover Summary A Soils B Soils C Soils D Soils Total %of Total Forest(acres) 0.00 0.00 0.00 0.00 0.00 0.00 ✓ Turf(acres) 0.00 8.10 1.12 0.00 9.22 73.85 Impervious(acres) 0.00 3.27 0.00 0.00 3.27 26.15 12.49 rr BMP Selections Practice Credit Area(acres) Downstream Practice ir• 9.b.Sheetflow to Conservation Area with C/o Soils(Spec#2) Impervious: 3.092401 Turf(Pervious): 8.726492 1111 Total Impervious Cover Treated(acres) 3.27 Total Turf Area Treated(acres) 9.22 Total TP Load Reduction Achieved in D.A.A(Ib/yr) 5.66 Total TN Load Reduction Achieved in D.A.A(Ib/yr) 81.00 ✓ w Irlr Nrl1 MO 1111 1111 11111 Summary Print 1x11 Virginia Runoff Reduction Method Worksheet Channel and Flood Protection ar Weighted CN 1-year 2-year storm 10-year storm Adjusted CN storm Adjusted Adjusted CN CN Target Rainfall Event(in) 3.05 3.69 5.57 D.A.A CN 72 68 69 70 D.A.B CN 0 #N/A #N/A #N/A D.A.C CN 0 #N/A #N/A #N/A D.A.D CN 0 #N/A #N/A #N/A D.A.E CN 0 #N/A #N/A #N/A 11Y 11r 111 1111 rrr OM ■r rr 1r Summary Print Phase 1 Storm Sewer Computations Limil Looti_____114ei, "nor limio Limo{ &NJ Larak LEO ,/ INA; lima , imeit N AMA\ '=„yk,111.1.1.11 60\\\ / 11.1112e...„,.. 111t::------- IIIIIIliII- ,.... ,, /.../ :S„. i I / j , , i , 1 i \ `--' 7 11 of i I / i/ / �\ '- _ ' �i/i i ..+-•• \ \-- !, , \\1 Z._-''' / / ', ' . . ` \ \ \ -'.... mo/ / , //�J / ..� \,:\ \. —_ __- ` � ---/ —/ - ii A \ _\�- _- -09- ti b_ _.�:�5��:��•`�,,�,;�-•,':.^,� �,1 l..l '� ■ ■.'A . pimp .\\- �• \ \ W--- - //72' :::1"-'"------ ' __ / �a.�,,,— oma ♦��� ►' . ♦��1'a.A'a ! ` t / �� __ ' � (/ • ~O 656, — �; / .- . �' - N -1 �Q�A ("3411/.nln :� o- ` 1\11,7//%:';;-/''\ \,N 0p9/// II / // . 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STM B8 200 ft overland flow 9.0% slope 0.35 C-value 12.7 min Seelye Chart 353 ft swale 22 ft height 2.1 min. Kirpich Chart 14.8 min. STM C5 200 ft overland flow 11.0% slope 0.35 C-value 10.3 min Seelye Chart 70 ft s. c.flow-field 26.4% slope 3.5 fps velocity 0.3 min. NEH Figure 15-4 248 ft paved swale 8.0 ft height 0.4 min. Kirpich Chart 11.1 min. STM C5B 200 ft overland flow 9.8% slope 0.35 C-value 12.5 min Seelye Chart 61 ft s. c.flow-field 11.5% slope 2.3 fps velocity 0.4 min. NEH Figure 15-4 35 ft swale 5.5 ft height 0.1 min. Kirpich Chart 13.0 min. 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I 1 I 11 1 I t 11 I i I I 1 : i 1 , ''''' ...'s----- / I i X / IJIri I : - Project Name: Chesterfield Landing-Full " , �' `" CLEAR ALL Date: 12/13/2017 BMP Design Specifications List: 2013 Draft Stds&Specso ti' alcufaNOri cells' f Site Information final results I I Post-Development Project(Treatment Volume and Loads) i .Land Cover (acres) A Soils B Soils C Soils D Soils I Totals -- MForest/Open Space(acres)--undisturbed, protected forest/open space or reforested land 5.58 5.46 4.31 15.35 Managed Turf(acres)--disturbed,graded for yards or other turf to be mowed/managed 15.98 1.12 17.10 '- Impervious Cover(acres) 6 20 6.20 •Forest/Open Space areas must be protected in accordance with the Virginia Runoff Reduction Method 1 38.65 1 Constants Runoff Coefficients(Rv) Annual Rainfall(inches) 43 A Soils B Soils C Soils D Soils I Target Rainfall Event(inches) 1.00 Forest/Open Space 0.02 0.03 - 0.04 0.05 :- Total Phosphorus.(TP)EMC(mg/L) 0.26 Managed Turf 0.15 0.20 - 0.22 0.25 Total Nitrogen(TN)EMC(mg/L) 1.86 Impervious Cover 0.95 0.95 0.95 0.95 I Target TP Load(lb/acre/yr) 0.41 Pj(unitless correction factor) 0.90 Post-Development Requirement for Site Area TP Load Reduction Required(Ib/yr) 6.45 ILAND COVER SUMMARY--POST DEVELOPMENT Land Cover Summary Forest/Open Space Cover(acres) Treatment Volume and Nutrient Loads Treatment Volume 15.35 (acre-ft) 0.8147 Weighted Rv(forest) 0.03 Treatment Volume(cubic feet) 35,488 %Forest 40% TP Load(lb/yr) 22.30 I -- TN Load(Ib/yr) Managed Turf Cover(acres) 17.10 (Informational Purposes Only) 159.51 Weighted Rv(turf) 0.20 %Managed Turf 44% II Impervious Cover(acres) 6.20 Rv(impervious) 0.95 I 11 %Impervious 16% Site Area(acres) 38.65 Site Rv 0.25 iiii 1 I I .. 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Erl C7 N N N I-. I-+ F-\ F-, T.. m l0 V 00 00cr, co N Ul W CD W Ql 00 F-\ A -, D D I-' CM W N O N I-, W Cil N W CO lD -• GD) T M m v 0 0 < O PPPPPPPPPPPPPP m om oc z) 0 V l.l; A CN A A 0/ V V C1 0l Ol Q1. n — 1 I D 7 V u Lo o o o o a o o D 1 11 �� rn n , U7 N W A LID LC 0 NJ A 0 ll'1 CM A I� - - •♦♦♦♦ 1T1 — MN .: 0 W"' r 'm" m§ o -,Structure Number j E (T., W W (� N Inlet Type IN 'o0 00 o CO i.=o `=w Curb Opening o `o =o ` o 0 w A Catchment Area v.,Vt g. or p 9 m 'o9 'v1 Runoff Coef co �'OD tD N ,1° -- m ��00a MN SO w u' 0..;:D, ,.-.1 _ a i0°Intensity to oo o o o o no I� h o o ,ro a °v). - co Q Catchment w o 4. b o b`s o Q carryover m r ON - Osc. (17 n N7.4.1.'1'. — - o A a oa �g.N;QTotal o '.Vt Vt : W t0 A 'O 5; Ill kb ▪o , o 6-o o{y ro Mannings N m Cl/ ° Cf/CO . rn 602 o 0 0 o ,. o C w Gutter Slopeoo w oao �`o oo 0 o, o VI NNNN% N _ A Pave X-slope .-- 0 � 0 O O O O a O v Gutter X-slope Ili w x,4 � m : N 'v) °) _.Total Gutter V A o m ` °)Spread 111111 OWO o'` - N - '. ., Depth at Curb im a . N ▪ ° iw�00 %Efficency 0 D. �. ,▪ - o f) , a)r a Q intercepted it o o `o : N o()Bypassed a OO $:' �: el o N o N Midpoint Depth rn w .� 1 ate. rn 9#9 1 ,' N Curb Height o u Ae c N D/HO N V w `< AN it'rn co a �- ° p Midpoint Spread so 71 N co 774. fq iti ll ;il ll ti lll 41 ,-.v .iii! . ,� NW W m .''''1;.§11 .hWCY V k03 XiWi Ws e= pW pWl. 0yeW as ; ,s -P,, pN 0. rii ;,:ri. 114',A 7'11 o 0:,1, ..1.-, it ti ii 1 ..8 ..: i.„ ii,r. i..)tt. 4 ,,,,_ ri.,0 it Pik ti . r ! IiIIF )I !1 88›SII • .. C st- 1,_.,A i .-.tii -; gt pfliA 9 Itz 01 V' -; 1,7. ,,:„rt! i'l:f,i(7 1 FK,1,,; v7,011'2 !.:„: 5.'7.i. :23-, ? '','-' C'''' r 0. .r .. 3 do or ti i ''',!!'t:14 41°L:.; Lo• wy D [-: w - x x - _ 4 4 cD Q 0 rrn o C 11 rtl- ao con. • o .. cin a7 is , o _ - o - b, `• ino n m5v — O — O N W A 41 N . O i v .. O �, .. ..„, _ rm ty — O + — 4 O -:.O — O # O C[ a fi, • •r N 9 ..r. :,-- b ill 71 itiN . O N ,„ ,:-.;„ ..i„. .,,,,,,iy i: ..?:!': k '.: fi trj R'.-: '7::: t: is titt r - • < rr fib' ,k, :,...: ,z, L.,. 1 , ti „.... -,:,, . g g!''. i':', ill; ,l- ff. .*. r.4 t tc r, ?..i: • ,. I ' gym N - 0 • ma. O • iiiiso' Li 3. n O ii- i Chesterfield Landing Level Spreader Flow Computations New Spreader E: 1.97 AC Treated Impervious Forebay Accum. Length 12 Velocity Flow Outfall (sf) (sf) AC (ft) (in/hr) Q2 (in/hr) Depth El 53,112 106 1.32 17 5.17 6.83 0.31 0.26 Forebay= 0.002 x Impervious VRRM TV=4745 cf Length = 13 x AC x 1 in/hr=Weir Width Channel Slope = 0.02 per ELS specQ = Cu, * L * H312 +� Mannings "n" = 0.07 for dense grass Updated Level Spreader B: 8.04 AC Treated Flow de th computed with weir formula, given in feet Impervious Forebay Accum. Length 12 Velocity Flow Outfall (sf) (sf) AC (ft) (in/hr) Q2 (in/hr) Depth B1 89,124 178 3.64 47 3.32 12.10 1.13 0.23 VRRM TV=11418 cf Spreaders from Phase 1 B: 8.73 AC Treated C: 4.67 AC Treated Impervious Forebay Accum. Length 12 Velocity Flow Outfall (sf) (sf) AC (ft) (in/hr) Q2 (in/hr) Depth B1 80,604 161 3.73 48 3.41 12.71 1.13 0.23 Cl 71,602 143 2.39 31 5.00 11.94 1.17 0.25 Spreader B TV=11375 cf Spreader C TV=7855 cf Phase 1 Spreader B was designed for excess capacity than the Phase 2 Conditions will generate. Spreader B is adequate for the updated land use. .r mommilli Mamma m W w Z 2 4214200 4214300 4214400 4214500 4214600 4214700 78°4Y 2"W a 78°4Y 2 W !!!N...z t 1.,. r -go, _ I 1)C 0 °N cr 1...1.'"'c n q 0 Q1 O O 7 V x t5 and aa2ol� o i gi a ovz U x r r 1 < e zco N V O N 8 6(`:"..7ca a -,,a c,.a o N La . 8 V CO En 3 n 01 1:1 I2 8 3 o a o 8 rtcnCD c a- m g O C7 ♦ o o o) �- - i rt t 8 Ui 6 (D V O 0 O N N V O N V O N O N 8 O NN S Q r4, a1f�11`v��S < '"J1 i' ., V O :. N g d VA II • 78°41'14"W "" f 78°41'14"W 4214200 4214300 4214400 42145004214700 4214700 ° z z MN cn > cn 2. ] ■ ■ ■ ■ A ; _� � � ❑ CCN ° co 7 7 7 7 N w w ? DCO Z 0 0 0 CO CO D (0 Z O c) C) w w D ° > m' 0 0 0 ° 0 0 o 1- 0 o v 0 o m CD m mFrj o D O g 7 N 7 7 (D O O a r1) E O D .s m C 6 13 v Q CD CD r m w * G) ■(� i Iy 7 m „ 0 ■ ■ ■ a o Z0 o. c m (ori N N m m = v, 0 0 C) 0 N N FaD) O xi ,;,, y W N a -oX x C 0 m m O 0 (D N Q 0 O . w N 2 tv J 0 (o N N Q 7 O N N OT O s v sv 3 r N N N CO ruCY 0 (T) _ N 7J CJS CD CO 0 C a CD CD .. -0 0 o ' o -I N p o (n Cn Cn 5- -I 0 D o.a 0 < Cn 3 13 y a 3 m * -1 O D7 O C O co 3 w U 3 0) o (D O (D (D 0. N N. 7 N 3 • (o a p W — — < y C p N (D•N O a C N N y O C o 3 co '.` C Q D o -o `G C N_ O -. o N O p O O o (D o N ry co 7 CO O 7 Q O N C D p d 7 _ 0 7 3 N O 3 0 = N 3 y • �'• = 3 ? d G yw (D m G o Cm CD O o N Q O N coO > d y O� D7 co 7. (D `G Z O y 7 Q 3 Q 0 O co a C .G 3 N o (D CO Q (D n C N o (D N 7 (D CO O N (D S < `G S 3 7 Q on ,; m w v CD N 803 i v a CD CD C m w 3 (03 ll.) 3 CD m. Q 3 y rn > N w c7i 7 D y O 3 A m m a- m y p y D II y S a o p- a D N n O co O. C N (D Q '< O 17 3 N -, O- N O' d O a o (D Cn .3. o CD 0 CD 7 7 0`G O 3 a V .G (D 0- y "Ii.)" O N CD 3 co o y C 0- :0 (D N 0 o 7 —Z � 36m 3 y 7 o m (DO• Q < �$ m o oQ 6 y' m d • 3 0 m * 3 m 2 7 CD m o 7 0 — m m -n w -0CD •.< o Q o(0 0 o w 0 . v a c m 7 o m m o CD D (D o d m CD 7 C N = 0 cr O y o 3 N (� Q 7 y = a C) Cn (D 3 a 6 O y D) 3 a N N D CD .-. N 3 0 s 0 N D) Fn C7 3 o a. (D O o _s n F > �. n w n o v 3 O _o D N n N Z N o N o- Cn N a O y CD C 3 3 O O(O Q Z a p O o o S �_ N 3 y co o K w 7 C) C En g 7 w'.G co v o w m O y o (D v D' Cr') y v o o • co m m v -a m 3 0 3 y .G N n o ,_CrCD Ul () �. N p co Z v o CO a m QN o ( y C a CD co N w 3 y Q (D v (n Cn 3 y w C co Q 3 O o o C N' 6 Q (D w o o n 7 C y y Q oI' n N .7-. 0 nN O- CD I 07 n N y n o o D7 N N3 (D C O D) (� D7 O o 7 C07 I 1 i Custom Soil Resource Report Table—Hydrologic Soil Group '7116 4'tlatAtUW j . _ ... ..(irp tea. ,. 4E Ashe loam,25 to 45 B 6.3 8.5% percent slopes 7B Braddock loam,2 to 7 B 6.7 9.0% percent slopes rr 16 Chewacla silt loam B/D 5.1 6.8% 17 Craigsville loam A 13.9 18.6% 36B Hayesville loam,2 to 7 B 4.6 6.2% rr percent slopes 36C Hayesville loam,7 to 15 B 8.7 11.7% percent slopes rs 37C3 Hayesville clay loam,7 to B 5.2 6.9% 15 percent slopes, severely eroded 37D3 Hayesville clay loam, 15 B 23.4 31.4% to 25 percent slopes, severely eroded 66E Parker very stony loam, A 0.2 0.3% �► 25 to 45 percent slopes W Water 0.5 0.6% Totals for Area of Interest 74.5 100.0% vim Rating Options—Hydrologic Soil Group air Aggregation Method: Dominant Condition Component Percent Cutoff None Specified Tie-break Rule: Higher ■r ma ira ✓r o w 26 NOAA Atlas 14,Volume 2,Version 3 LEXINGTON r" Station ID:44-4876 Location name: Lexington, Virginia, USA* "�4 '°`P Latitude:37.795°, Longitude:-79.4136° OSR Elevation: r. Elevation (station metadata): 1125 ft** "-x„y„„,;f 'source:ESRI Maps **source:USGS POINT PRECIPITATION FREQUENCY ESTIMATES mo G.M.Bonnin,D.Martin,B.Lin,T.Parzybok,M.Yekta,and D.Riley NOAA,National Weather Service,Silver Spring,Maryland N. PF tabular I PF graphical I Maas & aerials PF tabular - PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches)1 Duration Average recurrence interval(years) 1 2 5 10 25 50 100 200 500 1000 - 0.292 0.349 0.423 0.476 0.542 0.588 0.634 0.677 0.727 0.765 5-min (0.263-0.325) (0.314-0.389) (0.380-0.470) (0.427-0.528) (0.482-0.600) (0.521-0.652) (0.556-0.704) (0.588-0.754) (0.623-0.816) (0.648-0.865) 10-min 0.467 0.558 0.677 0.761 0.863 0.937 1.01 1.07 1.15 1.20 Igo (0.421-0.519) (0.503-0.621) (0.609-0.753) (0.683-0.844) (0.769-0.956) (0.829-1.04) (0.884-1.12) (0.933-1.20) (0.986-1.29) (1.02-1.36) 15-min 0.583 0.701 0.857 0.962 1.09 1.19 1.27 1.35 1.45 1.51 (0.526-0.648) (0.632-0.781) (0.771-0.952) (0.863-1.07) (0.974-1.21) (1.05-1.32) (1.12-1.42) (1.18-1.51) (1.24-1.63) (1.28-1.71) 0.800 0.968 1.22 1.40 1.62 1.79 1.95 2.11 2.30 2.45 rr 30-min (0.721-0.889) (0.873-1.08) (1.10-1.35) (1.25-1.55) (1.44-1.80) (1.58-1.98) (1.71-2.17) (1.83-2.35) (1.98-2.59) (2.08-2.77) 60-min 0.997 1.22 1.56 1.82 2.16 2.42 2.69 2.96 3.31 3.57 (0.899-1.11) (1.10-1.35) (1.40-1.73) (1.63-2.01) (1.92-2.39) (2.14-2.69) (2.36-2.99) (2.57-3.29) (2.83-3.71) (3.03-4.04) - 2-hr 1.16 1.41 1.82 2.13 2.54 2.87 3.20 3.53 3.97 4.30 (1.05-1.29) (1.28-1.57) (1.64-2.02) (1.92-2.36) (2.28-2.82) (2.55-3.18) (2.82-3.55) {3.08-3.94) (3.41-4.46) (3.64-4.87) 3-hr 1.25 1.51 1.94 2.26 2.70 3.05 3.41 3.78 4.26 4.62 sr (1.13-1.39) (1.37-1.68) (1.75-2.15) (2.04-2.51) (2.42-3.00) (2.72-3.39) (3.01-3.80) (3.29-4.22) (3.65-4.79) (3.91-5.24) 6-hr 1.56 1.88 2.37 2.77 3.33 3.79 4.27 4.77 5.47 6.01 (1.42-1.75) (1.70-2.10) (2.15-2.66) (2.50-3.10) (2.98-3.71) (3.36-4.22) (3.74-4.76) (4.12-5.35) (4.63-6.18) (5.01-6.84) 12a1r 1.92 2.30 2.89 3.39 4.12 4.73 5.39 6.11 7.13 7.97 NW (1.73-2.17) (2.07-2.60) (2.60-3.28) (3.03-3.84) (3.64-4.65) (4.13-5.33) (4.65-6.10) (5.18-6.93) (5.89-8.18) (6.45-9.22) 24-hr2.38 2.88 3.65 4.29 5.21 5.98 6.80 7.69 8.95 9.98 (2.21-2.57) (2.67-3.12) (3.39-3.95) (3.97-4.63) (4.80-5.62) (5.48-6.44) (6.19-7.33) {6.93-8.28) (7.98-9.64) (8.81-10.8) o r 2-day 2.79 3.37 4.26 4.97 5.99 6.83 7.72 8.66 9.98 11.0 (2.59-3.01) (3.13-3.64) (3.95-4.58) (4.60-5.34) (5.52-6.45) (6.27-7.34) (7.04-8.30) (7.84-9.32) (8.94-10.8) (9.81-11.9) 3-day 2.98 3.60 4.54 5.29 6.36 7.24 8.16 9.13 10.5 11.6 r. (2.77-3.22) (3.34-3.89) (4.20-4.89) (4.89-5.70) (5.85-6.85) (6.63-7.79) (7.43-8.79) (8.26-9.84) (9.39-11.3) (10.3-12.5) 4-day3.17 3.83 4.82 5.61 6.73 7.64 8.60 9.61 11.0 12.1 (2.94-3.43) (3.55-4.14) (4.45-5.20) (5.18-6.05) (6.18-7.25) (6.99-8.23) (7.82-9.28) (8.68-10.4) (9.84-11.9) (10.8-13.1) rr 7-day 3.68 4.42 5.49 6.34 7.52 8.46 9.44 10.4 11.8 12.9 (3.42-3.94) (4.11-4.74) (5.10-5.89) (5.88-6.79) (6.95-8.05) (7.78-9.06) (8.64-10.1) (9.50-11.2) (10.6-12.7) (11.5-13.9) 10-clay4.21 5.05 6.18 7.05 8.21 9.13 10.0 11.0 12.2 13.1 (3.95-4.49) (4.73-5.38) (5.78-6.58) (6.58-7.49) (7.65-8.73) (8.47-9.71) (9.28-10.7) (10.1-11.7) (11.1-13.0) (11.9-14.1) ma 20-clay 5.65 6.72 8.06 9.10 10.5 11.6 12.7 13.8 15.2 16.3 (5.34-6.01) (6.35-7.15) (7.59-8.57) (8.56-9.67) (9.84-11.2) (10.8-12.3) (11.8-13.5) (12.7-14.7) (14.0-16.3) (14.9-17.5) 30-clay6.99 8.26 9.71 10.8 12.2 13.3 14.3 15.4 16.7 17.6 (6.63-7.37) (7.83-8.71) (9.18-10.2) (10.2-11.4) (11.5-12.9) (12.5-14.0) (13.4-15.1) (14.3-16.2) (15.5-17.7) (16.3-18.7) in 45-day 8.83 10.4 12.0 13.2 14.8 15.9 17.0 18.0 19.3 20.2 (8.40-9.25) (9.89-10.9) (11.4-12.6) (12.6-13.9) (14.0-15.5) (15.1-16.7) (16.0-17.8) (17.0-18.9) (18.1-20.3) (18.8-21.3) 60-day 10.5 12.4 14.1 15.4 17.0 18.1 19.2 20.1 21.3 22.1 or (10.1-11.0) (11.8-12.9) (13.5-14.7) (14.7-16.1) (16.2-17.7) (17.3-19.0) (18.2-20.1) (19.1-21.1) (20.1-22.3) (20.8-23.2) 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 NM checked against probable maximum precipitation(PMP)estimates and may be higher than currently valid PMP values. Please refer to NOAA Atlas 14 document for more information. Back to Too ion