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HomeMy WebLinkAboutWPO202100036 Calculations 2021-09-22SHIMP ENGINEERING, P.C. Design Focused Engineering September 15, 2021 Engineering Review Albemarle County Department of Community Development 401 McIntire Road Charlottesville, VA 22902 APPROVED by the Albemarle County Community Developpment Department Date 9/22/21 File WP0202100036 Regarding: WPO 20200036 6889 Free Union Rd VSMP — SWM Calculation Packet Dear Emily, Enclosed is the stormwater calculation packet for 6889 Free Union Rd. The development property has an area of 2.32 acres and a disturbed area of 2.32 acres. The project is a private development of a site. The proposed stormwater design meets water quality requirements set forth in 9VAC25-870-65 and water quantity requirements set forth in 9VAC25-870-66-B(3) and 9VAC25-870-66-C. SWM Quality SWM Quality is satisfied by providing a Stormwater Management Agreement for the development. Per Albemarle County Code 17-403-B, a Stormwater Management Agreement can be provided in lieu of stormwater quality treatment for single-family developments. No other treatment is required. SWM Quantity SWM Quantity is satisfied by analyzing concentrated runoff from the development at 1 Point Of Analysis (POA) within a channel downstream of the development property. 9VAC25-870-66-B(3) requires that concentrated runoff from development at each POA meet the energy balance equation. To achieve this, most concentrated runoff from the site will be routed to a detention pond which discharges to the POA. The runoff from the detention to the POA meets the energy balance equation. 9VAC25-870-66-C requires that the post-dev 10-year runoff at the POA not exceed the pre-dev 10-yr runoff. This condition has also been satisfied. See table below for summary. POA Pre-dev Peak Runoff Max. Allowed Peak Runoff Post-dev Peak Runoff 1-Yr 1.21 cfs 0.73 cfs 0.48 cfs 10-Yr 10.95 cfs 10.95 cfs 9.75 cfs 912 E. High Sr. Charlottesville, VA 22902 1434.227.5140 1 shimp-engineering.com If you have any questions about this calculation packet please do not hesitate to contact me at: chrisgshimp- engineering com or by phone at 434-299-9843. Regards, Chris Marshall, EIT Shimp Engineering, PC Contents: Land Use Maps: Pre-Dev Land Cover Map Post-Dev Land Cover Map Water Quantity Calculations: Pre-Dev POA Drainage Map Post-Dev POA Drainage Map Energy Balance Equation TOC Calculations Predev HydroCAD Report Postdev HydroCAD Report Outlet Drainage Protection Spreadsheet VDOT LD-268 Ditch Design Independent Reports: NOAA Precipitation Report Excerpt from NRCS Soils Report Of I f / f 36C HSG B 7-46 00 SOME 12 ol LOD = 2.32 AC .. . i.'/. 14C HSG B • -RMCAL SLOPE / • ' .� ` `.. RMCAL SLOPE r; ' j4. 7-47 N m q 11* 4--------------- i b r � N I\ � DISTURBED AREA: 2.32 AC HSG B AREA: 2.32 AC WOODS: 2.32 AC IMPERVIOUS: 0 AC 50 100"1-- 1 0 Sc le: 1"=50 WRIGHT, WILLIAM P A & ASHLEIGH E OWENS D.S. 5510. PG. 59 T.P. 07-46C2 ZONED RA 10 36C WRIGHT. WILLIAM P A & ASHLEIGH E OWENS D.a. 5510, PG. 59 T.P. 07-46C1 ZONED RA moo HSG B ei HSG B 6889 FREE UNION ROAD W N POSTDEV VRRM MAP I 7 46 1 Md W 1 DITCH 5 141� ° kTC43 DIT Fj 4` ° ,. a RITICAL SLOPE A °a W�' I 7-47 Q 1 DISTURBED AREA: 2.32 AC HSG B AREA: 2.32 AC 0 TURF: 1.91 AC IMPERVIOUS: 0.41 AC 50 ♦ 0 50 100 150 Scale: 1 "F50' I I I \ I� \ 1. --- - 1� I — _ — -- - --- ----- ----- - ` _-- , �! , .___ -------- _-____._ ,;:; ;':✓/;i%;/;;%, ii,% -", %;; !,/, ';// /// /,; if \ , ;;/, , / ___� _� "-� - , - I I - y;' / low" It II' 1 I \ `\i \ 1It r \` 1 ` „ tt `PRE -DEVELOPMENT DA 7.19 AC __ , - = = = - "---- ' = , I III ' 1 1 1 \''' ,f% `. \ \ . \ �� ` \ �� \ �� `, \'' _ _- --_ z .�-\\` , �I , , , ._______- �,,,,,,,\,\\ `�• \\:,\yI,\ \` `�\\. \�\: �\\\ �.�\_��\ ---- 11 I \\ 1 -"_ !/1 'I!!I/// , p �. a I II, ------------- lit __- 1XI\ .I!� ;� % I h l L ' , ' / / ; /;;'Ill; I I I -- I `llI �a.-fir!/ ----- I to I ; 746 --- ` _ - - __�%------- — - ----- - \ - - -- I, - ---------------- -- / fq — — ' / /';l III,/ I A _ '- - �`�: I , , „ ------------ s _ v , IN It t , . AA v . �`. v `-. '', I' - __'_-__v_` - .�.�., ;.__', , .'----_- 6889 Free Union Rd PREDEV POA DRAINAGE MAP PREDEV DRAINAGE AREA DRAINAGE AREA TO POA: 7.19 AC HSG B AREA: ALL WOODS: 4.05 AC MANAGED TURF: 3.14 AC IMPERVIOUS: 0.00 AC TOC: 21.0 MIN 100 200 ✓Y' 300 1 \ - ` _ _ \ I I -- I, -= /- _____` ` ....+<'/ :' , / ,...><y,;) •,\`, \�`, ��.: \`�`�� III I l l i' jl / / / / � _ / r_ __' _ ____ „ /`: /: S's I) 1\`• I. II "il.rli^'I'✓1"h!-'ili ,/'/, 'Q'/ '/ 7 / - , _; ,__ /..., ,, ,, /,;: '—" ,-,;,�,-../'' ;i", ;ir' ii; ail; %l, j;'N �', i �%•'�=;—. - jo , , „ , j/ r//:;'' / �'/ ,';/l' ! �!( ,/r Ill 11 'l ♦ \`. ', /;;; '//. /ilA1I'll , l Ill ;' r 1 I I '„ `I,IIIIIII; - - II , -- 1 I - k, I `fs _ - Ili V� \\ �,\\YT \; `•\'`. -y- \\,`� \\�`. — � ,/T.:; /; ;; ./,;,r/, —��__ '� 'ill 111 111 ♦`' �\ \. \ \ t�.l .�\ ___ ___ ,1 \ f I/«'/';/'/: ./::�'/' // \ . I I I " , , — ------ — _ � I l l t \ t l \ ♦• . , • 1, - \> POST —DEVELOPMENT i I > \ .II I - i , 1 \+'� `r'\'.\`: �;' ,�: ,il I ♦, %/; ,'ll IlI Il; I;Ifj I 1 ♦- 1 ' / / ,/, /'/' /Ill';Wfll l 1 I ♦ _ I \if _ `a - I 'l II I r I \ I q III _ __ I ':II — ---------------------- 111 '/I ` � / Ill 'I/I 10,li ` � ,� �� '� -----�---�-- " /— _` \ ; l ; I >►I r; 1 ' 11 y`n1 I , � •\•`. , \'vt `. ` � ` \ __ ,,, i// ;%� ' ',, /' %/,;;ii%i, 7446 \\ -- r -' — Ill // I I `iX` `.` - ,�; ✓, j'i/, a Y 3 I1 \ \\\`` , .\Y,`II, jllj �'i'l;l o i' _ ■ _ ,\ I. \`. \` \\; �_ \•` �\,' ---_- ,•'� '%�; III II;i III / y — _ ____ ----- ` 'I h` ` r 7 7" / -�--------------��----'— -------------- , I r I I I; 1 _ 1 , — _ DNS oz ooee .� `,\\\` / •\` \\•` UM __ \I I ,'}1rh\I; I`I �'--_ .��'`;`; -- ----;- ''/----_ <%; ice' 6889 Free Union Rd POSTDEV POA DRAINAGE MAP POSTDEV DRAINAGE AREA DRAINAGE AREA TO POA: 7.96 AC HSG B AREA: ALL WOODS: 4.18 AC MANAGED TURF: 3.37 AC IMPERVIOUS: 0.41 AC TOC: 13.8 MIN ✓Y' 100 200 300 Energy Balance Equation Summary 1 6889 FREE UNION RD (POA) Qddvelopedl� I.F. *i Qpre- developed *RVPre-Developed)/RVdeveloped Qdeveloped� (Qforestetl RVforestetl) Rydeveloped Predev Postdev SITE AREA: 7.19 ac 7.96 ac Qpre-develope( = 1.21 RVPre-Develof = O.188 Max Qdevela = RVDeveloped = 0.250 1 0.73 cfs Maximum Q10yr = 10.95cfs (predev) Achieved Q10yr = 9.75cfs 6889 FREE UNION RD Time of Concentration Calculations - Predev 7 100 ft overland flow 15.0% slope 0.35 C-value 8.5 min Seelye Chart 693 ft s. c. flow 20.9% slope 1.2 fps velocity 9.6 min. NEH Figure 15-4 490 ft swale 35 ft height 2.9 min. Kirpich Chart 21.0 min. 6889 FREE UNION RD Time of Concentration Calculations - Postdev 1 100 ft overland flow 14.0% slope 0.35 C-value 9.0 min Seelye Chart 89 ft s. c. flow -field 13.5% slope 1.8 fps velocity 0.8 min. NEH Figure 15-4 1121 ft swale 163 ft height 4.0 min. Kirpich Chart 13.8 min. 35 30 u Paved 9 i 25 a 300 Bare ` 0 20 N 200 Soil 4 Poor \ W 2 Grass F �Zuffoce w z - 2 W Average r.9 0.5 W W Grass V z 0 0 J 15 / H a 80 Dense \ a 2.0 (n/ / z � Grass ° \ 70 \ SA z F a (n fi0 9 Nis. O I 0 0 50 / V 20 a (Z J 40 V i0 V 30 9 W z J 8 20 7 10 6 OVERLAND FLOW TIME i3cehc ('hzrU Smite: Data Book for Civil Enmaeera E.E. Seelye 1992 TRAVEL TIME FOR CHANNEL FLOW (Kirpich Chart) N (feet) Soo It (min.) 200 00 100 L (feet) 10000 fya9p)a 50 — so sago Nate: (1) for use with natural chsnMls, 10 (2) For s channels, witi Ply D00 �. 10 Nved Tt by 5 g 5 ' Soo 5 100 1 I TIME OF CONCENTRATION OF SMALL DRAINAGE BASINS Source: VDOT V-13 Plate 5-3 1S D 1 2L POA 1 Subcat Reach on Link Drainage Diagram for PREDEV HYDROCAD Prepared by {enter your company name here}, Printed 6/29/2021 HydroCADO 9.10 s/n 07054 0 2010 HytlroCAD Software Solutions LLC PreDev PREDEV HYDROCAD Type 11 24-hr 1-YR Rainfall=3.12" Prepared by {enter your company name here} Printed 6/29/2021 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 2 Time span=5.00-36.00 hrs, dt=0.05 hrs, 621 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1 S: DA 1 Runoff Area=7.190 ac 0.00% Impervious Runoff Depth=0.31" Tc=21.0 min CN=58 Runoff=1.21 cfs 0.188 of Link 2L: POA 1 Inflow=1.21 cfs 0.188 of Primary=1.21 cfs 0.188 of Total Runoff Area = 7.190 ac Runoff Volume = 0.188 of Average Runoff Depth = 0.31" 100.00% Pervious = 7.190 ac 0.00% Impervious = 0.000 ac PreDev PREDEV HYDROCAD Type 11 24-hr 1-YR Rainfall=3.12" Prepared by {enter your company name here} Printed 6/29/2021 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 3 Summary for Subcatchment 1S: DA 1 Runoff = 1.21 cfs @ 12.22 hrs, Volume= 0.188 af, Depth= 0.31" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-36.00 hrs, dt= 0.05 hrs Type II 24-hr 1-YR Rainfall=3.12" Area (ac) CN Description 3.140 61 >75% Grass cover, Good, HSG B 4.050 55 Woods, Good, HSG B 7.190 58 Weighted Average 7.190 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 21.0 Direct Entry, Summary for Link 2L: POA 1 Inflow Area = 7.190 ac, 0.00% Impervious, Inflow Depth = 0.31" for 1-YR event Inflow = 1.21 cfs @ 12.22 hrs, Volume= 0.188 of Primary = 1.21 cfs @ 12.22 hrs, Volume= 0.188 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-36.00 hrs, dt= 0.05 hrs PreDev PREDEV HYDROCAD Type 11 24-hr 10-YR Rainfall=5.67" Prepared by {enter your company name here} Printed 6/29/2021 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 4 Time span=5.00-36.00 hrs, dt=0.05 hrs, 621 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1 S: DA 1 Runoff Area=7.190 ac 0.00% Impervious Runoff Depth=1.55" Tc=21.0 min CN=58 Runoff=10.95 cfs 0.932 of Link 2L: POA 1 Inflow=10.95 cfs 0.932 of Primary=10.95 cfs 0.932 of Total Runoff Area = 7.190 ac Runoff Volume = 0.932 of Average Runoff Depth = 1.55' 100.00% Pervious = 7.190 ac 0.00% Impervious = 0.000 ac PreDev PREDEV HYDROCAD Type 11 24-hr 10-YR Rainfall=5.67" Prepared by {enter your company name here} Printed 6/29/2021 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 5 Summary for Subcatchment 1S: DA 1 Runoff = 10.95 cfs @ 12.16 hrs, Volume= 0.932 af, Depth= 1.55" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-36.00 hrs, dt= 0.05 hrs Type II 24-hr 10-YR Rainfall=5.67" Area (ac) CN Description 3.140 61 >75% Grass cover, Good, HSG B 4.050 55 Woods, Good, HSG B 7.190 58 Weighted Average 7.190 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 21.0 Direct Entry, Summary for Link 2L: POA 1 Inflow Area = 7.190 ac, 0.00% Impervious, Inflow Depth = 1.55" for 10-YR event Inflow = 10.95 cfs @ 12.16 hrs, Volume= 0.932 of Primary = 10.95 cfs @ 12.16 hrs, Volume= 0.932 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-36.00 hrs, dt= 0.05 hrs PreDev PREDEV HYDROCAD Type 11 24-hr 100-YR Rainfall=9.23" Prepared by {enter your company name here} Printed 6/29/2021 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 6 Time span=5.00-36.00 hrs, dt=0.05 hrs, 621 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1 S: DA 1 Runoff Area=7.190 ac 0.00% Impervious Runoff Depth=4.03" Tc=21.0 min CN=58 Runoff=30.84 cfs 2.415 of Link 2L: POA 1 Inflow=30.84 cfs 2.415 of Primary=30.84 cfs 2.415 of Total Runoff Area = 7.190 ac Runoff Volume = 2.415 of Average Runoff Depth = 4.03" 100.00% Pervious = 7.190 ac 0.00% Impervious = 0.000 ac PreDev PREDEV HYDROCAD Type 11 24-hr 100-YR Rainfall=9.23" Prepared by {enter your company name here} Printed 6/29/2021 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 7 Summary for Subcatchment 1S: DA 1 Runoff = 30.84 cfs @ 12.15 hrs, Volume= 2.415 af, Depth= 4.03" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-36.00 hrs, dt= 0.05 hrs Type II 24-hr 100-YR Rainfall=9.23" Area (ac) CN Description 3.140 61 >75% Grass cover, Good, HSG B 4.050 55 Woods, Good, HSG B 7.190 58 Weighted Average 7.190 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 21.0 Direct Entry, Summary for Link 2L: POA 1 Inflow Area = 7.190 ac, 0.00% Impervious, Inflow Depth = 4.03" for 100-YR event Inflow = 30.84 cfs @ 12.15 hrs, Volume= 2.415 of Primary = 30.84 cfs @ 12.15 hrs, Volume= 2.415 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-36.00 hrs, dt= 0.05 hrs DETENTION POND 3L POA 1 S4 Reach 4on Llflk PostDev POSTDEV HYDROCAD rev Type 11 24-hr 1-YR Rainfall=3.12" Prepared by {enter your company name here} Printed 6/29/2021 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 2 Time span=5.00-48.00 hrs, dt=0.05 hrs, 861 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1 S: DA 1 Runoff Area=7.960 ac 5.15% Impervious Runoff Depth=0.38" Tc=13.8 min CN=60 Runoff=2.54 cfs 0.250 of Pond 2P: DETENTION POND Peak Elev=704.18' Storage=2,695 cf Inflow=2.54 cfs 0.250 of Outflow=0.48 cfs 0.250 of Link 3L: PDA 1 Inflow=0.48 cfs 0.250 of Primary=0.48 cfs 0.250 of Total Runoff Area = 7.960 ac Runoff Volume = 0.250 of Average Runoff Depth = 0.38" 94.85% Pervious = 7.550 ac 5.15% Impervious = 0.410 ac POSTDEV HYDROCAD rev Prepared company name here) PostDev Type/1 24-hr 1-YR Rainfall=3.12" Printed 6/29/2021 Summary for Subcatchment 1S: DA 1 Runoff = 2.54 cfs @ 12.10 hrs, Volume= 0.250 af, Depth= 0.38" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-48.00 hrs, dt= 0.05 hrs Type II 24-hr 1-YR Rainfall=3.12" Area (ac) CN Description 3.370 61 >75% Grass cover, Good, HSG B 4.180 55 Woods, Good, HSG B 0.410 98 Paved parking, HSG B 7.960 60 Weighted Average 7.550 94.85% Pervious Area 0.410 5.15% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.8 Direct Entry, Summary for Pond 2P: DETENTION POND Inflow Area = 7.960 ac, 5.15% Impervious, Inflow Depth = 0.38" for 1-YR event Inflow = 2.54 cfs @ 12.10 hrs, Volume= 0.250 of Outflow = 0.48 cfs @ 12.89 hrs, Volume= 0.250 af, Atten= 81 %, Lag= 47.3 min Primary = 0.48 cfs @ 12.89 hrs, Volume= 0.250 of Routing by Stor-Ind method, Time Span= 5.00-48.00 hrs, dt= 0.05 hrs Peak Elev= 704.18' @ 12.89 hrs Surf.Area= 2,758 sf Storage= 2,695 cf Plug -Flow detention time= 95.9 min calculated for 0.250 of (100% of inflow) Center -of -Mass det. time= 96.8 min ( 1,027.1 - 930.3 ) Volume Invert Avail.Storage Storage Description #1 703.00' 18,438 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 703.00 1,767 0 0 704.00 2,628 2,198 2,198 706.00 4,034 6,662 8,860 708.00 5,544 9,578 18,438 Device Routing Invert Outlet Devices #1 Primary 703.00' 4.0" Round PVC L= 63.0' CPP, mitered to conform to fill, Ke= 0.700 Inlet / Outlet Invert= 703.00' / 702.00' S= 0.0159 T Cc= 0.900 n= 0.012 #2 Primary 704.00' 18.0" Round Culvert L= 58.0' CPP, mitered to conform to fill, Ke= 0.700 Inlet / Outlet Invert= 704.00' / 702.00' S= 0.0345 T Cc= 0.900 PostDev POSTDEV HYDROCAD rev Type 11 24-hr 1-YR Rainfall=3.12" Prepared by {enter your company name here} Printed 6/29/2021 HvdroCAD@ 9.10 s/n 07054 @ 2010 HvdroCAD Software Solutions LLC Paae 4 n= 0.012 #3 Primary 707.00' 60.0' long x 10.0' breadth Broad -Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64 Primary OutFlow Max=0.48 cfs @ 12.89 hrs HW=704.18' (Free Discharge) 11=PVC (Barrel Controls 0.32 cfs @ 3.64 fps) 2=Culvert (Inlet Controls 0.16 cfs @ 1.29 fps) 3= Broad-C rested Rectangular Weir( Controls 0.00 cfs) Summary for Link 3L: POA 1 Inflow Area = 7.960 ac, 5.15% Impervious, Inflow Depth > 0.38" for 1-YR event Inflow = 0.48 cfs @ 12.89 hrs, Volume= 0.250 of Primary = 0.48 cfs @ 12.89 hrs, Volume= 0.250 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-48.00 hrs, dt= 0.05 hrs PostDev POSTDEV HYDROCAD rev Type 11 24-hr 10-YR Rainfall=5.67" Prepared by {enter your company name here} Printed 6/29/2021 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 5 Time span=5.00-48.00 hrs, dt=0.05 hrs, 861 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1 S: DA 1 Runoff Area=7.960 ac 5.15% Impervious Runoff Depth=1.71" Tc=13.8 min CN=60 Runoff=17.31 cfs 1.134 of Pond 2P: DETENTION POND Peak Elev=706.28' Storage=10,022 cf Inflow=17.31 cfs 1.134 of Outflow=9.75 cfs 1.134 of Link 3L: PDA 1 Inflow=9.75 cfs 1.134 of Primary=9.75 cfs 1.134 of Total Runoff Area = 7.960 ac Runoff Volume = 1.134 of Average Runoff Depth = 1.71" 94.85% Pervious = 7.550 ac 5.15% Impervious = 0.410 ac POSTDEV HYDROCAD rev Prepared company name here) PostDev Type/1 24-hr 10-YR Rainfall=5.67" Printed 6/29/2021 Summary for Subcatchment 1S: DA 1 Runoff = 17.31 cfs @ 12.07 hrs, Volume= 1.134 af, Depth= 1.71" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-48.00 hrs, dt= 0.05 hrs Type II 24-hr 10-YR Rainfall=5.67" Area (ac) CN Description 3.370 61 >75% Grass cover, Good, HSG B 4.180 55 Woods, Good, HSG B 0.410 98 Paved parking, HSG B 7.960 60 Weighted Average 7.550 94.85% Pervious Area 0.410 5.15% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.8 Direct Entry, Summary for Pond 2P: DETENTION POND Inflow Area = 7.960 ac, 5.15% Impervious, Inflow Depth = 1.71" for 10-YR event Inflow = 17.31 cfs @ 12.07 hrs, Volume= 1.134 of Outflow = 9.75 cfs @ 12.21 hrs, Volume= 1.134 af, Atten= 44%, Lag= 8.4 min Primary = 9.75 cfs @ 12.21 hrs, Volume= 1.134 of Routing by Stor-Ind method, Time Span= 5.00-48.00 hrs, dt= 0.05 hrs Peak Elev= 706.28' @ 12.21 hrs Surf.Area= 4,246 sf Storage= 10,022 cf Plug -Flow detention time= 52.0 min calculated for 1.134 of (100% of inflow) Center -of -Mass det. time= 51.7 min ( 922.1 - 870.5 ) Volume Invert Avail.Storage Storage Description #1 703.00' 18,438 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 703.00 1,767 0 0 704.00 2,628 2,198 2,198 706.00 4,034 6,662 8,860 708.00 5,544 9,578 18,438 Device Routing Invert Outlet Devices #1 Primary 703.00' 4.0" Round PVC L= 63.0' CPP, mitered to conform to fill, Ke= 0.700 Inlet / Outlet Invert= 703.00' / 702.00' S= 0.0159 T Cc= 0.900 n= 0.012 #2 Primary 704.00' 18.0" Round Culvert L= 58.0' CPP, mitered to conform to fill, Ke= 0.700 Inlet / Outlet Invert= 704.00' / 702.00' S= 0.0345 T Cc= 0.900 PostDev POSTDEV HYDROCAD rev Type 11 24-hr 10-YR Rainfall=5.67" Prepared by {enter your company name here} Printed 6/29/2021 HvdroCAD@ 9.10 s/n 07054 @ 2010 HvdroCAD Software Solutions LLC Paae 7 n= 0.012 #3 Primary 707.00' 60.0' long x 10.0' breadth Broad -Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64 Primary OutFlow Max=9.72 cfs @ 12.21 hrs HW=706.27' (Free Discharge) 11=PVC (Barrel Controls 0.46 cfs @ 5.31 fps) 2=Culvert (Inlet Controls 9.26 cfs @ 5.24 fps) 3= Broad-C rested Rectangular Weir( Controls 0.00 cfs) Summary for Link X: POA 1 Inflow Area = 7.960 ac, 5.15% Impervious, Inflow Depth = 1.71" for 10-YR event Inflow = 9.75 cfs @ 12.21 hrs, Volume= 1.134 of Primary = 9.75 cfs @ 12.21 hrs, Volume= 1.134 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-48.00 hrs, dt= 0.05 hrs PostDev POSTDEV HYDROCAD rev Type 11 24-hr 100-YR Rainfall=9.23" Prepared by {enter your company name here} Printed 6/29/2021 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 8 Time span=5.00-48.00 hrs, dt=0.05 hrs, 861 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1 S: DA 1 Runoff Area=7.960 ac 5.15% Impervious Runoff Depth=4.28" Tc=13.8 min CN=60 Runoff=45.49 cfs 2.840 of Pond 2P: DETENTION POND Peak Elev=707.40' Storage=15,248 cf Inflow=45.49 cfs 2.840 of Outflow=51.11 cfs 2.840 of Link 3L: PDA 1 Inflow=51.11 cfs 2.840 of Primary=51.11 cfs 2.840 of Total Runoff Area = 7.960 ac Runoff Volume = 2.840 of Average Runoff Depth = 4.28" 94.85% Pervious = 7.550 ac 5.15% Impervious = 0.410 ac POSTDEV HYDROCAD rev Prepared company name here) PostDev Type/1 24-hr 100-YR Rainfall=9.23" Printed 6/29/2021 Summary for Subcatchment 1S: DA 1 Runoff = 45.49 cfs @ 12.06 hrs, Volume= 2.840 af, Depth= 4.28" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-48.00 hrs, dt= 0.05 hrs Type II 24-hr 100-YR Rainfall=9.23" Area (ac) CN Description 3.370 61 >75% Grass cover, Good, HSG B 4.180 55 Woods, Good, HSG B 0.410 98 Paved parking, HSG B 7.960 60 Weighted Average 7.550 94.85% Pervious Area 0.410 5.15% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.8 Direct Entry, Summary for Pond 2P: DETENTION POND Inflow Area = 7.960 ac, 5.15% Impervious, Inflow Depth = 4.28" for 100-YR event Inflow = 45.49 cfs @ 12.06 hrs, Volume= 2.840 of Outflow = 51.11 cfs @ 12.06 hrs, Volume= 2.840 af, Atten= 0%, Lag= 0.2 min Primary = 51.11 cfs @ 12.06 hrs, Volume= 2.840 of Routing by Stor-Ind method, Time Span= 5.00-48.00 hrs, dt= 0.05 hrs Peak Elev= 707.40' @ 12.06 hrs Surf.Area= 5,091 sf Storage= 15,248 cf Plug -Flow detention time= 28.2 min calculated for 2.837 of (100% of inflow) Center -of -Mass det. time= 28.8 min ( 871.5 - 842.8 ) Volume Invert Avail.Storage Storage Description #1 703.00' 18,438 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 703.00 1,767 0 0 704.00 2,628 2,198 2,198 706.00 4,034 6,662 8,860 708.00 5,544 9,578 18,438 Device Routing Invert Outlet Devices #1 Primary 703.00' 4.0" Round PVC L= 63.0' CPP, mitered to conform to fill, Ke= 0.700 Inlet / Outlet Invert= 703.00' / 702.00' S= 0.0159 T Cc= 0.900 n= 0.012 #2 Primary 704.00' 18.0" Round Culvert L= 58.0' CPP, mitered to conform to fill, Ke= 0.700 Inlet / Outlet Invert= 704.00' / 702.00' S= 0.0345 T Cc= 0.900 POSTDEV HYDROCAD rev Prepared company name here} PostDev Type/1 24-hr 100-YR Rainfall=9.23" Printed 6/29/2021 n= 0.012 #3 Primary 707.00' 60.0' long x 10.0' breadth Broad -Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64 Primary OutFlow Max=47.44 cfs @ 12.06 hrs HW=707.37' (Free Discharge) 1I=PVC (Barrel Controls 0.52 cfs @ 6.01 fps) 2=Culvert (Inlet Controls 12.16 cfs @ 6.88 fps) 3= Broad-C rested Rectangular Weir (Weir Controls 34.75 cfs @ 1.56 fps) Summary for Link 3L: POA 1 Inflow Area = 7.960 ac, 5.15% Impervious, Inflow Depth = 4.28" for 100-YR event Inflow = 51.11 cfs @ 12.06 hrs, Volume= 2.840 of Primary = 51.11 cfs @ 12.06 hrs, Volume= 2.840 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-48.00 hrs, dt= 0.05 hrs Outlet Protection Calculations - Reference Nomograph 3.18-3 Pipe Outfall # Q-10 Cfs La ft W ft Do in Do ft 3Do ft d50 ft d50 in Depth in Culvert 1 3.71 8 9.25 15 1.25 3.75 0.5 6 9 Culvert 2 5.42 8 9.25 15 1.25 3.75 0.5 6 9 Culvert 3 7.53 9 10.25 15 1.25 3.75 0.5 6 9 Culvert 4 9.75 12.5 13.75 15 1.25 3.75 0.5 6 9 00 CES::,Ni OF W-L-f PRatECTI-A F�CM A ROLYD PIPF f•IONI%G rJLL *A;N: •N TA:LWA'E; C01431Tt ,.M 11.5 >[A1�ETEa) - 3 Mfet w Dc ' 4 t Di neece", co f 1 I l� • . f .. i c • Tter 0. SGp OA vA III � :1 :. . . ... I • 1 � � - • • EL if _. _ (. 1 :. r. �• •` - 1't. • o lw orvwnc.ci Min. 3 C-4 100 too Sao �ooc Di sct•.vle • U /sec . 6889 FREE UNION RD Modified LD-268 Roadside and Median Ditch Design Form Side Slope Min. Max Ditch C A CA To 12 110 Q2 Q10 - :1 L - :1 R Slope FUR Slope Ft/Ft Allowable Velocity 2-yr 'Velocity 10-yr "Depth Matting Type Fr brew chenrel Deem INCR 7 ACC 1 0.60 0.13 0.08 0.08 5.0 5.17 6.81 0.40 0.53 3 3 0.08 0.08 4.0 2.06 0.28 EC-2 TYPE 1 0.72 1.00 2 0.60 0.91 0.54 0.54 5.0 5.17 6.81 2.82 3.71 3 3 0.08 0.08 4.0 3.35 0.59 EC-2 TYPE 1 0.41 1.00 3 0.60 1.33 0.80 0.80 5.0 5.17 6.81 4.11 5.42 3 3 0.17 0.17 7.0 4.98 0.68 EC-3 TYPE 1 0.32 1.00 4 0.60 0.08 0.05 0.05 5.0 5.17 6.81 0.24 0.32 3 1 3 0.17 0.17 4.0 2.40 0.20 1 EC-2 I TYPE 1 F 0.80 1.00 5 0.60 0.44 0.26 1.11 5.0 5.17 6.81 5.72 7.53 3 3 0.17 0.17 7.0 5.30 0.67 EC-3 TYPE 1 0.34 1.00 6 0.60 0.18 0.11 0.11 5.0 5.17 6.81 0.54 0.72 3 3 0.17 0.17 4.0 2.94 0.28 EC-2 TYPE 1 0.72 1.00 '2-yr Velocity calculations performed using steepest slope & 2-yr Bow " 10-yr Depth calculation performed using shallowest slope & 10-yr Bow NOAA Atlas 14, Volume 2, Version 3r„,„, �.�' Location name: Free Union, Virginia, USA* y ]®= Latitude: 38.2282°, Longitude:-78.5886° Elevation: 720.12 ft** source: ESRI Maps A "- source: USGS POINT PRECIPITATION FREQUENCY ESTIMATES G.M. Bonin, D. Martin, B. Lin, T. Parzybok, M.Yekta. and D. Riley NOAA, National Weather Service, Silver Spring, Maryland PF tabular I PF graphical I Maps & aerials PF tabular PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches)+ Average recurrence interval (years) Duration + z s +o zs so 1 100 oo zoo soo +000 s-min (0.305-0372) (0.36 0.446) (0.4340529) (0.488-0597) (0.55 0674) (05 97--0.0736) (0.641-0.798) (0.68�57) (07 31-0.36) (0.70711--11.00) +0-min (0.488-0595) (0.58 0714) (0693-0.845) (0.7 8-0951) (0.874-1.07) (0.948-11.17) (1.021.26) (1.08-2136) (115-1.48) (1.21�'57) 1.35 1 +5-min (0.6 0-0..743) (0.735-0.895) (0.875--1607) (0.984-11.20) (1.11-21.36) (1.20-148) (1.28�1.60) 1 (1.36---1.71) 1 (1.451.85) (1.521797) 0.920 +.+2 1.37 +.58 +.82 2.02 2.2+ 2.40 2.65 2.86 30-min (0.834-1.3) 1 (1.01-1.24) 1 (1.241.51) 1 (1.42-1.74) 1 (1.642.01) 1 (1.0-2.22) (1.96-2.44) (2.11-2.65) (2.30-2.94) (2.45-3.18) 2.05 2.73 60-min (1.04-126) (1.27-�55) (1.59-1.94) (1.85-2.26) (2.1272z67) (2.443.01) (2. 0--3.35) (2.95-3..71) (3.30.4.21) (3.574.3) 2-hr (1.231.53) (1.50--61786) (1.89-2.34) (2.21-2775) (2.63--3.28) (2.973674) (3.32-4.21) (3.9�72) (4:8-5.45) (4.60.6.09) 2.30 3-hr (1.35--11..69) (1.64 2306) (2.05-2.58) (2. 0-3.02) (265-3.61) (32 3A.12) (3.62-4.65) (4. 3-05.23) (45 9-6.06) (5.06-6.78) 6-hr (17 422..18) (2.111-2.65) (2.61 3?29) (3.0 �87) (36 54 65) (4: 6-5.3) (4.655A8) (52 4-6.90) (6.03-8.10) (67 0.9.18) 12-hr (2.19�2.78) (2.6537.36) (32 9A.18) (3.86-4694) (46 6-5.99) (5.346.95) (6.06-8.00) (6.849.18) (7.97461.0) (8.97- 2.6) 24hr (2.82-3.48) (3Al-4.21) (4.33-5.36) (5. 98.32) (6. 8---74.72) (7.09-8.92) (8.3-210.2) 1 (9: 4111.7) 1 (107-14.0) (12.0. 5.9) 2-day (3.32-4707) (4. 3993) (510-6.25) (5.96--67.33) (7.167 8288) (8.17-210.2) (9.23-11.6) 1 (10.4-3.2) 1 (12.0. 5.6) (13.3-187.7) 3-day (3.56-4.32) (4.315323) (5.45-6.62) (6.38-074.76)1 (7. 8940) (8.75-10.8) (9.89-12.3) (111z14.0) 1 (12.8- 6.4) (14.3- 8.6) 76 4day �.4) (3. 0-4.57) (4. 05252) (5.81-37700) (6.808.19) (8. 9992) (9.34 (105- 3.0) (11.8-14.7) (137J-17.3) (152- 9.5) 7-day (4: 285.29) (5. 3-6.36) (6.65-796) (7.8� 4) (9.20- 1.1) (10.4-2.6) (1173-14.3) 1 (13.0- 6.1) 1 (14.9- 8.7) (16.4-0.9) 10-day (5.05�5.96) (6.06-7.15) (7.46-8.81) (8.57- 0.1) 1 (10.1-12.0) 1 (113 3.5) 1 (12.6- 5.1) 1 (13.9-16.8) 1 (157- 9.3) (17.2-21.4) 18.0 20-day (6.71-7973) (8. 0920) (9.63-131.1) (10.9-12.6) (12.6-14.6) (13.9- 6.1) (152-17.7) (16.5- 9.4) (18.221.7) (19.6- 3.6) 30-day (8.279039) (9.81-- 1.1) (11.6-13.1) (12.9-14.7) (14.6- 6.7) (15.9- 8.2) (1Z$ 9.7) 19.8 (18.3-21.2) 21.6 (19.9- 3.2) (2121324.8) 45-day (10.4-11.7) (122- 3.8) (142-1-16.1) (157G--17.8) (176- 9.9) (19.0.21.6) (20.3 3.2) (216324.7) (232526.8) (24.4-8.4) 60-day 22 (122-1-13.6) (14.3-16.0) (16.5- 8.4) (18.0-20.2) (200722.4) (21.5-24.1) (22.825.7) (242127.3) (252772.2) (26.8- 0.7) t Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS). Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval. The probability that precipitation frequency estimates (for a given duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at upper bounds are not checked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values. Please refer to NOAA Atlas 14 document for more information. Back to Top PF graphical nykE G 3km Large scale terrain P Raltir Washington, D.C." H arrisonburg . 5 nLMbli V I R 6 1 N I A iI A Rich + d 100kn ichl,i irg cksbil 1 Omi Large scale map 9 Hxrriaon I Lynchburg Blai 100km 60mi Large scale aerial \I USDA United States Department of Agriculture MRCS Natural Resources Conservation Service A product of the National Cooperative Soil Survey, a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local participants Custom Soil Resource Report for Albemarle County, Virginia March 4, 2021 - 436C '. moo K&)P 14D 4 14 D y� 36C V�. MAPLEGEND Area of Interest (AOO O Area of Interest (AOI) Solis Soil Map Unit Polygons N Soil Map Unit Lines Soil Map Unit Points Special Point Features V Blowout ® Borrow Pit Clay Spot O Closed Depression Gravel Pit Gravelly Spot O Landfill A. Lava Flow Marsh or swamp Mine or Quarry O Miscellaneous Water O Perennial Water y Rock Outcrop + Saline Spot Sandy Spot Severely Eroded Spot Q Sinkhole Slide or Slip J, Sodic Spot Custom Soil Resource Report MAP INFORMATION g Spoil Area The soil surveys that comprise your AOI were mapped at 1:15,800. o Stony Spot W Very Stony Spot Warning: Soil Map may not be valid at this scale. wet Spot Enlargement of maps beyond the scale of mapping can cause Other misunderstanding of the detail of mapping and accuracy of soil Special Line Features line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed Water Features scale. Streams and Canals Transportation Please rely on the bar scale on each map sheet for map �..ry Rails measurements. N Interstate Highways Source of Map: Natural Resources Conservation Service ti US Routes Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Major Roads Local Roads Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts Background distance and area. A projection that preserves area, such as the . Aerial Photography Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA-NRCS certified data as of the version date(s) listed below. Soil Survey Area: Albemarle County, Virginia Survey Area Data: Version 14, Jun 3, 2020 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Apr 22, 2015—Mar 10, 2017 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. 10 Custom Soil Resource Report Map Unit Legend Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI 4E Ashe loam, 25 to 45 percent slopes 4.2 9.2% 14C Chester loam, 7 to 15 percent slopes 3.4 7.4% 14D Chester loam, 15 to 25 percent slopes 12.4 27.4% 15E Chester very stony loam, 25 to 45 percent slopes 18.3 40.4% 36C Hayesville loam, 7 to 15 percent slopes 7.0 15.4% w Water 0.1 0.2% Totals for Area of Interest 45.3 100.0% Map Unit Descriptions The map units delineated on the detailed soil maps in a soil survey represent the soils or miscellaneous areas in the survey area. The map unit descriptions, along with the maps, can be used to determine the composition and properties of a unit. A map unit delineation on a soil map represents an area dominated by one or more major kinds of soil or miscellaneous areas. A map unit is identified and named according to the taxonomic classification of the dominant soils. Within a taxonomic class there are precisely defined limits for the properties of the soils. On the landscape, however, the soils are natural phenomena, and they have the characteristic variability of all natural phenomena. Thus, the range of some observed properties may extend beyond the limits defined for a taxonomic class. Areas of soils of a single taxonomic class rarely, if ever, can be mapped without including areas of other taxonomic classes. Consequently, every map unit is made up of the soils or miscellaneous areas for which it is named and some minor components that belong to taxonomic classes other than those of the major soils. Most minor soils have properties similar to those of the dominant soil or soils in the map unit, and thus they do not affect use and management. These are called noncontrasting, or similar, components. They may or may not be mentioned in a particular map unit description. Other minor components, however, have properties and behavioral characteristics divergent enough to affect use or to require different management. These are called contrasting, or dissimilar, components. They generally are in small areas and could not be mapped separately because of the scale used. Some small areas of strongly contrasting soils or miscellaneous areas are identified by a special symbol on the maps. If included in the database for a given area, the contrasting minor components are identified in the map unit descriptions along with some characteristics of each. A few areas of minor components may not have been observed, and consequently they are not mentioned in the descriptions, especially where the pattern was so complex that it 11 Custom Soil Resource Report was impractical to make enough observations to identify all the soils and miscellaneous areas on the landscape. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The objective of mapping is not to delineate pure taxonomic classes but rather to separate the landscape into landforms or landform segments that have similar use and management requirements. The delineation of such segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, however, onsite investigation is needed to define and locate the soils and miscellaneous areas. An identifying symbol precedes the map unit name in the map unit descriptions. Each description includes general facts about the unit and gives important soil properties and qualities. Soils that have profiles that are almost alike make up a soil series. Except for differences in texture of the surface layer, all the soils of a series have major horizons that are similar in composition, thickness, and arrangement. Soils of one series can differ in texture of the surface layer, slope, stoniness, salinity, degree of erosion, and other characteristics that affect their use. On the basis of such differences, a soil series is divided into soil phases. Most of the areas shown on the detailed soil maps are phases of soil series. The name of a soil phase commonly indicates a feature that affects use or management. For example, Alpha silt loam, 0 to 2 percent slopes, is a phase of the Alpha series. Some map units are made up of two or more major soils or miscellaneous areas. These map units are complexes, associations, or undifferentiated groups. A complex consists of two or more soils or miscellaneous areas in such an intricate pattern or in such small areas that they cannot be shown separately on the maps. The pattern and proportion of the soils or miscellaneous areas are somewhat similar in all areas. Alpha -Beta complex, 0 to 6 percent slopes, is an example. An association is made up of two or more geographically associated soils or miscellaneous areas that are shown as one unit on the maps. Because of present or anticipated uses of the map units in the survey area, it was not considered practical or necessary to map the soils or miscellaneous areas separately. The pattern and relative proportion of the soils or miscellaneous areas are somewhat similar. Alpha -Beta association, 0 to 2 percent slopes, is an example. An undifferentiated group is made up of two or more soils or miscellaneous areas that could be mapped individually but are mapped as one unit because similar interpretations can be made for use and management. The pattern and proportion of the soils or miscellaneous areas in a mapped area are not uniform. An area can be made up of only one of the major soils or miscellaneous areas, or it can be made up of all of them. Alpha and Beta soils, 0 to 2 percent slopes, is an example. Some surveys include miscellaneous areas. Such areas have little or no soil material and support little or no vegetation. Rock outcrop is an example. iv Custom Soil Resource Report Albemarle County, Virginia 4E—Ashe loam, 25 to 45 percent slopes Map Unit Setting National map unit symbol: kbc2 Elevation: 380 to 2,250 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: Not prime farmland Map Unit Composition Ashe and similar soils: 75 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Ashe Setting Landform: Mountain slopes Landform position (two-dimensional): Summit Landform position (three-dimensional): Interfluve Down -slope shape: Convex Across -slope shape: Convex Parent material: Residuum weathered from granite and gneiss Typical profile H1 - 0 to 10 inches: loam H2 - 10 to 19 inches: loam H3 - 19 to 24 inches: sandy loam H4 - 24 to 79 inches: bedrock Properties and qualities Slope: 25 to 45 percent Depth to restrictive feature: 20 to 40 inches to lithic bedrock Drainage class: Somewhat excessively drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Very low to high (0.00 to 5.95 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water capacity: Low (about 3.2 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Hydrologic Soil Group: B Hydric soil rating: No 13 Custom Soil Resource Report 14C—Chester loam, 7 to 15 percent slopes Map Unit Setting National map unit symbol: kb81 Elevation: 380 to 1,690 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: Farmland of statewide importance Map Unit Composition Chester and similar soils: 80 percent Estimates are based on observations, Description of Chester descriptions, and transects of the mapunit. Setting Landform: Hillslopes Landform position (two-dimensional): Summit Landform position (three-dimensional): Interfluve Down -slope shape: Convex Across -slope shape: Convex Parent material: Residuum weathered from granite and gneiss Typical profile H1 - 0 to 7 inches: loam H2 - 7 to 41 inches: clay loam H3 - 41 to 79 inches: loam Properties and qualities Slope: 7 to 15 percent Depth to restrictive feature: More than 80 inches Drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat) (0.57 to 1.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water capacity: Moderate (about 6.9 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 3e Hydrologic Soil Group: B Hydric soil rating: No Moderately high to high 14 Custom Soil Resource Report 14D—Chester loam, 15 to 25 percent slopes Map Unit Setting National map unit symbol: kb82 Elevation: 360 to 1,690 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: Farmland of statewide importance Map Unit Composition Chester and similar soils: 80 percent Estimates are based on observations, Description of Chester descriptions, and transects of the mapunit. Setting Landform: Hillslopes Landform position (two-dimensional): Summit Landform position (three-dimensional): Interfluve Down -slope shape: Convex Across -slope shape: Convex Parent material: Residuum weathered from granite and gneiss Typical profile H1 - 0 to 7 inches: loam H2 - 7 to 41 inches: clay loam H3 - 41 to 79 inches: loam Properties and qualities Slope: 15 to 25 percent Depth to restrictive feature: More than 80 inches Drainage class: Well drained Runoff class: High Capacity of the most limiting layer to transmit water (Ksat) (0.57 to 1.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water capacity: Moderate (about 6.9 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 4e Hydrologic Soil Group: B Hydric soil rating: No Moderately high to high 15 Custom Soil Resource Report 15E—Chester very stony loam, 25 to 45 percent slopes Map Unit Setting National map unit symbol: kb86 Elevation: 460 to 2,300 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: Not prime farmland Map Unit Composition Chester and similar soils: 75 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Chester Setting Landform: Hillslopes Landform position (two-dimensional): Summit Landform position (three-dimensional): Interfluve Down -slope shape: Convex Across -slope shape: Convex Parent material: Residuum weathered from granite and gneiss Typical profile H1 - 0 to 7 inches: loam H2 - 7 to 41 inches: clay loam H3 - 41 to 79 inches: loam Properties and qualities Slope: 25 to 45 percent Surface area covered with cobbles, stones or boulders: 7.0 percent Depth to restrictive feature: More than 80 inches Drainage class: Well drained Runoff class: High Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.57 to 1.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water capacity: Moderate (about 6.9 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7s Hydrologic Soil Group: B Hydric soil rating: No Custom Soil Resource Report 36C—Hayesville loam, 7 to 15 percent slopes Map Unit Setting National map unit symbol: 2xxy4 Elevation: 360 to 1,540 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: Farmland of statewide importance Map Unit Composition Hayesville and similar soils: 80 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Hayesville Setting Landform: Hillslopes Landform position (two-dimensional): Summit Landform position (three-dimensional): Interfluve Down -slope shape: Convex Across -slope shape: Convex Parent material: Residuum weathered from granite and gneiss Typical profile A - 0 to 7 inches: loam Bt - 7 to 58 inches: clay BC - 58 to 67 inches: sandy clay loam C - 67 to 83 inches: fine sandy loam Properties and qualities Slope: 7 to 15 percent Depth to restrictive feature: More than 80 inches Drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.57 to 1.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water capacity: High (about 10.6 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 4e Hydrologic Soil Group: B Hydric soil rating: No IVA Custom Soil Resource Report W—Water Map Unit Setting National map unit symbol: kbgk Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: Not prime farmland Map Unit Composition Water: 100 percent Estimates are based on observations, descriptions, and transects of the mapunit. 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