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HomeMy WebLinkAboutWPO201500047 Plan - VSMP 2015-07-21 STORMWATER POLLUTION PREVENTION PLAN • The Pants Project SINGLE FAMILY RESIDENCE COMMON PLAN of DEVELOPMENT or$ALE STORMWATER POLLUTION PREVENTION PLAN (SWPPP) For Construction Activities At: The Pants Project 863 Dry Bridge Rd Albemarle County, VA 22903 Latitude: 38°02'43.1" N (decimal degrees) Longitude: 78°37'36.3"W(decimal degrees) Construction Activity Operator: Arterra Design&Construction 4223 Earlysville Road Earlysville,VA 22936 SWPPP Preparation Date: April 22, 2015 CERTIFICATION "I certify under penalty of law that I have read and understand this document and that this document and all attachments were prepared in accordance with a system designed to assure that qualified personnel properly gathered and evaluated the information submitted. Based on my inquiry of the person or persons who manage the system,or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief,true,accurate,and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and 'mp isonment for knowing violations." Operator Name: 14 0, Title: gr. y! �""� f' f G L L C Signature: Date: 0 --2l I PS- 07/2014, Rev. 1 Single Family Residence, CPoD, SWPPP 'i...= STORMWATER POLTION PREVENTION PLAN • The Pants Project 8.0 Inspections&Corrective Action Log(make additional copies as necessary) Qualified Inspector Company/Organization: Arterra Design Name: Matt Crane Telephone Number: 434.981.4961 Qualifications: Class A Contractor's License Inspection Schedule Discharges to surface waters: O Once every 5 business days;or ® Once every 10 business days and no later than 48 hours following a measurable storm event. Discharges to impaired waters,surface waters within a TMDL watershed,or exceptional waters: O Once every 4 business days;or ❑ Once every 5 business days and no later than 48 hours following a measurable storm event. Inspection Date TBD Measurable Storm Event Insert Date& Rainfall Amount of Last Measurable Storm Event(if applicable) Best Management In Compliance Corrective Action Needed; Date Corrective Practices(BMPs) with SWPPP? Responsible Party Action Taken Erosion&Sediment Controls ®Yes ❑ No (Section 4.0) Pollution Prevention Practices ®Yes 0 No (Section 5.0) Stormwater ®Yes ❑ No Management Controls (Section 6.0) 0 NA Certification "I certify under penalty of law that I have read and understand this document and that this document and all attachments were prepared in accordance with a system designed to assure that qualified personnel properly gathered and evaluated the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief,true,accurate,and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowi ola' ns." Lim Operator Name: A4-14-<",(--4, Inspector Name: fti?Q ..-*.✓ Signature: Gam /1/4----4` Signature: / ' Date: ---7( /(2-) / t C Date: 7 1fr 07/2014, Rev. 1 Single Family Residence, CPoD, SWPPP STORMWATER POLLCITION PREVENTION PLAN The Pants Project 1.0 SWPPP Documents Located Onsite&Available for Review SWPPP Document Type Located Onsite&Available for Review? Registration Statement ® Yes 0 NA Notice of Coverage Letter 0 Yes ® NA Construction General Permit ® Yes 0 NA Site Plan ® Yes 0 NA Erosion&Sediment Control Plan(or agreement in lieu of) ® Yes 0 NA Stormwater Management Plan(or agreement in lieu of) ® Yes 0 NA 2.0 Authorized Non-Stormwater Discharges Type of Authorized Non-Stormwater Discharge Likely Present at Your Project Site? External buildings wash down 0 Yes ® No Uncontaminated foundation or footing drains 0 Yes ® No Uncontaminated excavation dewatering 0 Yes ® No Landscape irrigation 0 Yes ® No Others[describe] 0 Yes ® No 3.0 Pollution Prevention Awareness Employees will be given a"walk through"of the site identifying areas of possible pollution and will be shown Erosion and Sediment Controls and Pollution Prevention Practices(identified in Sections 4.0 and 5.0 of this SWPPP)that are applicable to their assigned job duties. A refresher meeting and "walk through" will be conducted on an as needed basis. 4.0 Erosion&Sediment Controls Estimated Estimated Select all Erosion&Sediment Control Installation Removal Responsible that apply Date Date Party ® Construction Entrance 03/01/15 12/31/15 (Std. &Spec.3.02) ® Silt Fence 03/01/15 12/31/15 (Std. &Spec.3.05) ® Culvert Inlet Protection 03/01/15 12/31/15 (Std. &Spec.3.08) 0Outlet Protection 05/01/15 NA (Std.&Spec.3.18) Temporary Seeding As required Construction Activity ® (Std.&Spec.3.31) by 3.31 NA Operator(See Cover Page of this SWPPP) 0Permanent Seeding 03/01/15 NA (Std.&Spec.3.32) ❑ Sodding NA (Std.&Spec.3.33) ® Mulching 03/01/15 NA (Std.&Spec.3.35) O Others[describe] 07/2014, Rev. 1 Single Family Residence, CPoD, SWPPP `err '..r'` o UI N 0 N Cl) Cl) 13 K K 0 -0 Cn n C7 -0 Co o 5. 3 fp o O v m m PI , o < ? m i� m m 0) a m m -, 0) .a m = co o �• i m N v' a) m co c .. m c° a 0 c 7 0 Si. 0) 5 Cl)• 7 y fD N cD co 7 !pA N dw a. i 3 (D 13, (D 'p S. 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U) w co ? a 2 = 0 U) a o UJ < f° CD (2, v C 0 y w N co -I' 0 v o a .57.. ❑ ® ❑ ❑ ® ® ® ® ® ❑ ® -U -' -< -< -< -< -< -< -< -< -< -< o v m o CD CD CD CD CD CD CD CD CD CD CD CD...� = U) Cl) U) U) U) U) CA U) CO U) U) a,,4 _ CC ❑ ❑ ® ® ❑ ❑ ❑ ❑ ❑ ® ❑ oc m 0 Z Z Z Z Z Z Z Z Z Z Z v 3 O O 0 0 0 0 0 0 0 0 0 � CD 7 X x x X x x Sediment o v x x x x x x Nutrients a) -o n o x x x x x Heavy Metals m w x x X x X x pH(acids and bases) c x x Pesticides&Herbicides x x x x Oil&Grease x x Bacteria&Viruses x x x x x X x x x x Trash, Debris,Solids 0 0 x x x x x x Other Toxic Chemicals 3 Cn > co m m D13 X < a .» 3 r mo = r- •.< = C 71 —I CD O Q Z CD v 00CD - —� m mm m) CD X m- pvo o -v 0 7- 'v, Cn o 0) p Cn ' ,' iO - miZ < m o r -o .1; 0 Z Nov' STORMWATER POLL !TION PREVENTION PLAN • The Pants Project Pollution Prevention Practices: (1) Clearing, grading, excavating and un-stabilized areas— Utilize erosion and sediment controls to prevent sediment laden or turbid runoff from leaving the construction site. Dispose of clearing debris at acceptable disposal sites. Apply permanent or temporary stabilization, sodding and/or mulching to denuded areas in accordance with the erosion and sediment control specifications and the general VPDES permit for discharges of stormwater from construction activities. (2) Paving operations—Cover storm drain inlets during paving operations and utilize pollution prevention materials such as drip pans and absorbent/oil dry for all paving machines to limit leaks and spills of paving materials and fluids. (3) Concrete washout and cement waste—Direct concrete wash water into a leak-proof container or leak-proof settling basin that is designed so that no overflows can occur due to inadequate sizing or precipitation.Hardened concrete wastes shall be removed and disposed of in a manner consistent with the handling of other construction wastes. (4) Structure construction, stucco, painting and cleaning—Enclose, cover or berm building material storage areas if susceptible to contaminated stormwater runoff. Conduct painting operations consistent with local air quality and OSHA regulations. Mix paint indoors, in a containment area or in a flat unpaved area. Prevent the discharge of soaps, solvents,detergents and wash water from construction materials,including the clean-up of stucco paint,form release oils and curing compounds. (5) Dewatering operations — Construction site dewatering from building footings or other sources may not be discharged without treatment. Sediment laden or turbid water shall be filtered, settled or similarly treated prior to discharge. (6) Material delivery and storage— Designate areas of the construction site for material delivery and storage. Place near construction entrances, away from waterways, and avoid transport near drainage paths or waterways. (7) Material use during building process — Use materials only where and when needed to complete the construction activity. Follow manufacturer's instructions regarding uses, protective equipment, ventilation, flammability and mixing of chemicals. (8) Solid waste disposal — Designate a waste collection area on the construction site that does not receive a substantial amount of runoff from upland areas and does not drain directly to a waterway. Ensure that containers have lids so they can be covered before periods of rain, and keep containers in a covered area whenever possible. Schedule waste collection to prevent the containers from overfilling. (9) Sanitary waste—Prevent the discharge of sanitary waste by providing convenient and well-maintained portable sanitary facilities. Locate sanitary facilities in a convenient location away from waterways. (10) Landscaping operations — Maintain as much existing vegetation as practicable. Apply permanent or temporary stabilization,sodding and/or mulching to denuded areas in accordance with the erosion and sediment control specifications and the general VPDES permit for discharges of stormwater from construction activities. Apply nutrients in accordance with manufacturer's recommendations and not during rainfall events. (11) Others—If applicable, describe your Pollution Prevention Practice. 6.0 Stormwater Management Controls Select all Estimated Responsible that apply Stormwater Management Control Installation party Date Post-development Stormwater Management Controls Common Plan ❑ provided by a NA Construction Larger Common Plan of Development or Sale Activity Operator ❑ Rooftop Disconnection Insert Date ❑ Sheetflow to Vegetated Filter(1 or 2) Insert Date Construction ❑ Grass Channel Insert Date Activity Operator (See Cover Page ❑ Rainwater Harvesting Insert Date of this SWPPP) ❑ Permeable Pavement(1 or 2) Insert Date 07/2014, Rev. 1 Single Family Residence, CPoD, SWPPP N"'' STORMWATER POLTION PREVENTION PLAN • The Pants Project Select all Estimated Responsible that a ply Stormwater Management Control Installation Pa rty p Date ❑ Infiltration(1 or 2) Insert Date Construction ❑ Bioretention (1 or 2) Insert Date Activity Operator (See Cover Page of this SWPPP) Wet Pond 2 09/01/2015 7.0 Spill Prevention&Response Most spills can be cleaned up following manufacturer specifications. Absorbent/oil dry, sealable containers, plastic bags,and shovels/brooms are suggested minimum spill response items that should be available at this location. 1st Priority: Protect all people 2nd Priority: Protect equipment and property 3rd Priority: Protect the environment 1. Check for hazards (flammable material, noxious fumes, cause of spill)—if flammable liquid,turn off engines and nearby electrical equipment. If serious hazards are present leave the area and call 911.LARGE SPILLS ARE LIKELY TO PRESENT A HAZARD. 2. Make Sure the spill area is safe to enter and that it does not pose an immediate threat to health or safety of any person. 3. Stop the spill source. 4. Call co-workers and supervisor for assistance and to make them aware of the spill and potential dangers. 5. If possible,stop spill from entering drains(use absorbent or other material as necessary). 6. Stop spill from spreading(use absorbent or other material) 7. If spilled material has entered a storm sewer;contact locality's storm water department. 8. Clean up spilled material according to manufacturer specifications, for liquid spills use absorbent materials and do not flush area with water. 9. Properly dispose of cleaning materials and used absorbent material according to manufacturer specifications. Emergency Contacts: Normal Working Hours DEQ Blue Ridge Regional Office(Roanoke) 540-562-6700 DEQ Blue Ridge Regional Office(Lynchburg) 434-582-5120 DEQ Northern Regional Office 703-583-3800 DEQ Piedmont Regional Office 804-527-5020 DEQ Southwest Regional Office 276-676-4800 DEQ Tidewater Regional Office 757-518-2000 DEQ Valley Regional Office 540-574-7800 Nights, Holidays&Weekends VA Dept. of Emergency Management 804-674-2400 24 Hour Reporting Service Local Contacts Local Fire Department 434-296-5833 Local Police Department 434-296-5807 07/2014, Rev. 1 Single Family Residence, CPoD, SWPPP STORMWATER POLtTION PREVENTION PLAN The Pants Project 9.0 Grading&Stabilization Activities Log Date Description of the Date Date Description of the Grading Grading Stabilization Activity Grading Activity Activity Measures Stabilization Measure Initiated (including location) Ceased Initiated (including location) 10.0 SWPPP Modification&Update Log Modification Modification Prepared By Date Description of the Modification/Update (name&title) 07/2014, Rev. 1 Single Family Residence, CPoD, SWPPP i`INSTRUCTIONS for COMPLETING the SINGE FAMILY RESIDENCE,COMMON PLAN of DEVELOPMENT or SALE STORMWATER POLLUTION PREVENTION PLAN (SWPPP) General A Stormwater Pollution Prevention Plan(SWPPP)must be developed prior to obtaining locality(e.g.,City,County,Town)authorization to commence land disturbance. Cover Pane For a construction activity,enter the project/site name and physical address(if available),including city(or town),state and zip code. Enter the latitude and longitude in decimal degrees of the construction activity. Enter the Construction Activity Operator's company/organization name,the Operator's name and mailing address, including city(or town),state,and zip code,telephone number,email address(if available),and a 24-hour emergency contact. Enter the SWPPP preparation date. The Construction Activity Operator identified on the cover page of the SWPPP is responsible for certifying the information contained therein. Please sign the certification in INK. Please note that state statues require the SWPPP to be signed as follows: (1)For a corporation:by a responsible corporate officer; (2)For a partnership or sole proprietorship:by a general partner or the proprietor,respectively; (3)For a municipality,state,federal,or other public agency:by either a principal executive officer or ranking elected official. Section 1.0 SWPPP Documents Located Onsite&Available for Review Utilize the provided checklist to ensure that the required SWPPP documents are located onsite and are available for review, if applicable. Section 2.0 Authorized Non-Stormwater Discharges Identify the authorized non-stormwater discharges likely to be present at the project site. If an unlisted authorized non-stormwater discharge is likely to be present at the project site,provide it here. Section 3.0 Pollution Prevention Awareness Provide employees with a"walk through"of the project site and identify areas of possible pollution, erosion and sediment controls, and pollution prevention practices which are applicable to their assigned job duties. Conduct refresher meetings and perform additional"walk throughs"on an as needed basis. Section 4.0 Erosion&Sediment Controls Identify the erosion and sediment controls to be implemented at the Droiect sites Fns -'-- — . int control,enter the estimated installation date and estimated removal< vented at the project site,provide the applicable information here. Section 5.0 Potential Sources of Pollution&Pol Identify the pollutant-generating activities likely to t responding pollution prevention practices. If an unlisted pollutant-gen( ;cribe it, identify the associated pollutant(s),and provide the corresponc aintained. Section 6.0 Stormwater Management Controls Identify the stormwater management controls to be ;water management control,enter the estimated installation date. If an i at the project site, provide the applicable information here. Section 7.0 Spill Prevention&Response Most spills can be cleaned up following manufacture quipment,property, and the environment. Enter the telephone number c Section 8.0 Inspections&Corrective Action Log Enter the qualified inspector's company/organizatior rations. Select the applicable inspection schedule, enter the construct amount of the last measurable storm event(if applicable). Identify if th •i with the SWPPP. Enter corrective actions needed;the party responsit active actions were taken,if applicable. Make additional copies of the in Section 9.0 Grading&Stabilization Activities Log Enter the date grading activities were initiated, a description of the grading activities including location, the date grading activities ceased,the date stabilization measures were initiated,and a description of the stabilization measures including location. Section 10.0 SWPPP Modification&Update Log Enter the SWPPP modification date,description of the SWPPP modification/update,and the name and title of the SWPPP modification preparer,if applicable. 07/2014, Rev. 1 Single Family Residence, CPoD, SWPPP PROJECT MANAGEMENT SFIIMP CIVIL ENGINEERING LAND PLANNING ENGINEERING July 9, 2015 Albemarle County Regarding: The Pants Project Stormwater Management Dear Sir or Madam, Enclosed are the calculations and details relating to stormwater treatment for the proposed development The Pants Project. The area inside the stream buffer or part of the BMP totals 1.47 acres, and is listed as conservation area in the VRRM. Pollutant removal is achieved with a level 2 wet pond. The wet pond was selected in order to capture runoff from the driveway and adjacent managed turf at the low point of the site, as the driveway runoff cannot be otherwise captured. The pond discharges to an existing stream, so the energy balance equation is applied. The existing site is fully covered by woods, so an improvement factor is not required. Qwooded *RVwooded Qdev = RVdev All other discharges are sheet flow with an insignificant increase over pre-development levels. If you have any questions please do not hesitate to contact me at your earliest opportunity. I may be reached at: Justin a shimp-engineerinq.com or by phone at 434-953-6116. Yours Truly, ,�. Justin Shimp, P.E. .. c) JU is r. 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Printed 7/13/2015 HydroCAD®9.10 s/n 07054 ©2011 HydroCAD Software Solutions LLC Page 1 wil Summary for Subcatchment 1: D.A.1 Runoff = 2.50 cfs @ 12.21 hrs, Volume= 0.573 af, Depth> 0.20" AO Runoff by SCS TR-20 method, UH=SCS,Time Span=0.00-24.00 hrs,dt=0.01 hrs Type II 24-hr 1yr Rainfall=3.04" . Area(sf) CN Description 1,475,889 55 Woods,Good, HSG B 1,475,889 100.00%Pervious Area Me Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) .. 18.2 Direct Entry, do s 4. .. AM i Pants Project Culvert Pre-Development Type 1124-hr 10yr Rainfall=5.54" .. Prepared by Shimp Engineering, P.C. Printed 7/13/2015 HydroCAD®9.10 s/n 07054 ©2011 HydroCAD Software Solutions LLC Page 2 ® Summary for Subcatchment 1: D.A.1 Runoff = 43.35 cfs @ 12.13 hrs, Volume= 3.534 af, Depth> 1.25" Runoff by SCS TR-20 method, UH=SCS,Time Span=0.00-24.00 hrs,dt=0.01 hrs Type II 24-hr l0yr Rainfall=5.54" Area(sf) CN Description 1,475,889 55 Woods,Good, HSG B 1,475,889 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 18.2 Direct Entry, `\N \ \ 11 \ \ \ \ 1 \ � \ I I , I I S � I cn ■ \\\ \ \ \ 1 \ \ \ \ \ \ \ I\ -` \ 1 I I \�\ _ / - o `\\\\\ \\ \ \ 1 \ \ \ \\ \ \ \ I W �\ \ I \ V' // o tEE J \\\ \\ \\ \ \ \\ 11 \ 1 \ 7 _1 Erl o \\\\\�� \ \ \ \ \\\\\ \ `$I \ I I \� ,i'/ /i D � ■■ n o \\ \\� \\� \\ I \\ \ III I� •�\ \ Cp ✓ ��/��j /� izT;ij - o � �� \\� �� \ IIIA 46 1� � // / // ' -/' / /v —_-�-_, \ ic15; I / / / / // // v, �/%'/// /i D c ��\ ` -lam \ I / / / // / // //7 ,-,-/j /// , �\�\ \\\ �\ �- /4I 1(//' / / // / /S/' z/ / / ' m -\,_\�� _ _ - - `\�`\ \\\\ "\ ✓// / / �l/ 9/ 4 ; `,/p //■.' / / _. i !_ -2-- --- ....„N .,.\\\\,. -----:------/i/z. t // ,//// / 'if -- ----- --- z/ :.,,•'''',,,- , ,o) //ltz ---- --",- ' CD / \ \ _ -_N. \ \\\\\ \,...,•,,,,,,,...,-.N...,--_ ,..„-____\ �///� ._:;14,„ , r/'//,,,,. / / / �i / ...>___� / ///:.&/ /// ADD . 4 7 Z' ''.1(A&" — — — ---- '8' - — — ;.011144/14114,114/14 , 4 ,, / / /////::'740>'' //// • cs:), 7 _ca ,,,,,, — — wizz iiel ---: -- -___ _ ' ' "l _-----\-- �\ \\,.___ ____ ?/° ) / / / // :/ ////, / 7/ -7 / Qm. . f -- E-11" / "-7, - A- -� \ i / // /// r�� / / // / // / / / -- - ,� -12... ,_ / �,,//y / ////j/// / // / / / // r I/ / / - - - - _ / / , / / / / / / / // /,: ,// / •♦ / / /4, �{ rg // — i� // - --4k10, ((\,--\-////////////// / / //7/7) / / ,7;z,/////////////:„.,,-, / /�/ // it �� / •v7, - - - __ /\/ ' /— \\ \(.4„,,,/, / / // i �i\ \ / ,' •!,�\ \ .'j // /10�t/ / / - i / / ____- __ __ - _,.. ---_, 7 • 7 ,, 7 -1.\\\\\ \\ / 7 / // 1\ \\A\ \ \ 1 \ I .( / ' -N \ \ ,- \ :A �� /--\ / ��, / // ..wL: ., \ l I ( / \— � '= \�\, \ \, �� , ,\. `fir ,//'//7'#-41►t - ' =_': 17'x:\, \ 1 I ` 1�/' /'/j \\\� \• -- ,-- -- is, \ \ — - - X 11 \ \ `. y /� /, i _ _ � \ II ///// / / y' / / / ///' /� \\ \\\ ''\ I I I Il\1 I`� n,>%7 /�/ / / " ' - -' ,�� \ I I i / \\.-, \\\\\ -_--_-=---_-,- __,,n,``.. ,, � � I 1 / \ ,y / // / / / _ y \ III II ill , / �� \ � \� — I1 / \_ // / /i / / - - - = ::'\\\V 111 / / \ \ \\\ \\ N ,,/� 1I II11 III \ \ / // ////�'`/� - --— 1, IIIII III I / / I _ \ \\\\\\"\\\N\ ------_-7->-----1/ 1 / / / ,��j' � 1111 I11 I( l l ' �I,_ \ \ \ \\ \ ` � l{//////11/11) 111////)lJ 1 l 11 l I ' ' /' ' / // /// �i`� //� � — _ �� I 1 I I I l / \.a► / / / / I1 1 // // / / / . 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Ln l0 I� 00 01 �O r-II rM-f L: N Q Q r' .;y.' •Q Q •Q Q Q Q Q 'Q td E C C ,-) r„.a p p p G G et Q d r Q rrr Virginia Runoff Reduction Method New Development Worksheet - v2.8 - June 2014 To be used w/ 2011 BMP Standards and Specifications Site Data Project Name: The Pants Project Date: 05/15/2015 data input cells --- -- --- -- --- --- calculation cells constant values 1. Post-Development Project & Land Cover Information Constants Annual Rainfall (inches) Target Rainfall Event(inches) 1.00 Phosphorus EMC (mg/L) 0.26 Nitrogen EMC (mg/L) 1.86` Target Phosphorus_ Target Load (Ib/acre/yr) 0.41 Pj 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 1.47 Managed Turf(acres)--disturbed, graded for yards or other turf to be mowed/managed 2.01 Impervious Cover(acres) 0.87 Total 4.35 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 Land Cover Summary Forest/Open Space Cover(acres) 1.47 Weighted Rv(forest) 0.03 % Forest 34% -Managed Turf Cover(acres) 2.01 Weighted Rv(turf) _ 0.20 % Managed Turf 46% Impervious Cover(acres) _ 0.87 -- --- --- --- --- --- --- --- --- Rv(impervious) 0.95 1 - - - - --- -- --- --- ----- Impervious 20% Total Site Area(acres) 4.35 Site Rv 0.29 - - - - ---- ----- --- Post-Development Treatment Volume(acre-ft) 0.11 Post-Development Treatment Volume(cubic feet) 4,620 Post_Development Load (TP) (Ib/yr) 2.90 Post_Development Load (TN) (Ib/yr' 20.761 Total Load (TP) Reduction Required (Ib/yr) 1.12 Virginia Runoff Reduction Method Worksheet aIr Virginia Runoff Reduction Method New Development Worksheet-v2.8-June 2014 ISM Site Data Summary Total Rainfall=43 inches ow Site Land Cover Summary A Soils B Soils C Soils D Soils Total %of Total Forest(acres) 0.00 1.47 0.00 0.00 1.47 33.79 Turf(acres) 0.00 2.01 0.00 0.00 2.01 46.21 or Impervious(acres) 0.00 0.87 0.00 0.00 0.87 20.00 4.35 100.00 aro Site Rv 0.29 Post Development Treatment Volume(ft3) 4620 Post Development TP Load(lb/yr) 2.90 Post Development TN Load(Ib/yr) 20.76 ars Total TP Load Reduction Required(lb/yr) 1.12 Total Runoff Volume Reduction(ft') 0 rrr Total TP Load Reduction Achieved(Ib/yr) 1 Total TN Load Reduction Achieved(Ib/yr) 4.65 Adjusted Post Development TP Load(lb/yr) 1.68 Remaining Phosphorous Load Reduction(Lb/yr)Required 0.00 air Drainage Area Summary D.A.A D.A.B D.A.C D.A.D D.A.E Total UM Forest(acres) 0.00 0.00 0.00 0.00 0.00 0.00 Turf(acres) 0.00 0.00 1.54 0.00 0.00 1.54 Impervious(acres) 0.00 0.00 0.43 0.00 0.00 0.43 1.97 ow Drainage Area Compliance Summary D.A.A D.A.B D.A.C D.A.D D.A.E Total arr TP Load Red.(Ib/yr) 0.00 0.00 1.22 0.00 0.00 1.22 TN Load Red.(Ib/yr) 0.00 0.00 4.65 0.00 0.00 4.65 MI Mil MIR OM MO MN JUN NO Summary Print Virginia Runoff Reduction Method Worksheet r Drainage Area C Summary Land Cover Summary A Soils B Soils C Soils D Soils Total %of Total Forestacres ( ) 0.00 0.00 0.00 0.00 0.00 0.00 Turf(acres) 0.00 1.54 0.00 0.00 1.54 78.35 Impervious(acres) 0.00 0.43 0.00 0.00 0.43 21.65 ar 1.97 BMP Selections Practice Credit Area(acres) Downstream ar Practice 13.c.Wet Pond#2(Spec#14) Impervious: 0.426125 Turf(Pervious): 1.542264 ar Total Impervious Cover Treated(acres) 0.43 Total Turf Area Treated(acres) 1.54 Total TP Load Reduction Achieved in D.A.A(Ib/yr) 1.22 Total TN Load Reduction Achieved in D.A.A(lb/yr) 4.65 as a ar aaa as as as ra as r era as aaa Summary Print Virginia Runoff Reduction Method Worksheet ion Channel and Flood Protection airi Weighted CN 1-year 2-year storm 10-year storm Adjusted CN storm Adjusted Adjusted i CN CN Target Rainfall Event(in) 3.04 3.68 5.54 D.A.A CN 0 #N/A #N/A #N/A D.A.B CN 0 #N/A #N/A #N/A MO D.A.C CN 69 69 69 69 D.A.D CN 0 #N/A #N/A #N/A D.A.E CN 0 #N/A #N/A #N/A AIM S MN NM NM MO MI MI S OM Mil MI S ME MN Summary Print ." 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B I- -0 0 0 kka co Er' � ( 7 • § 0 § / % § 7 1 E E 3 0 0 a The Pants Project Energy Balance Calculation 24 Hr 1 year Storm I.F.* (Qpre * RVpre) Qdev — RVdev (Qwooded * "wooded) Qdev RVdev I.F.= 0.8 Qpre 2.50 RVpfe 0.573 RVdev 0.599 �.. Qdev(Eq. 1) 1.913 Qdev(Eq. 2) 2.391 a a a a a a s a ..r 10 9 8 D.A.9 i) . . ( > /// D.A.11 D.A.B (12 ... 0 D.A.12 ( 6 D.A.7 D.A.1 0 D.A.6 NW AN) ripc D.A.5 LevtPond \ D.A.2 4 P 4 A (-6-p) FOREBAY#2 D.A.4 (.3) FOREBAY#1 POND DA D.A.3 a a (Subca) Reach 'on• Drainage Diagram for Pants Project Culvert Post-Development Prepared Engineering, , n /11 HydroCAD®9.10by s/nShimp 07054 ©2011 HydroCADP.C. PriSoftware ted7Solutio0/20ns5 LLC INN Pants Project Culvert Post-Development Type 1124-hr lyr Rainfall=3.04" Prepared by Shimp Engineering, P.C. Printed 7/10/2015 HydroCAD®9.10 s/n 07054 ©2011 HydroCAD Software Solutions LLC Page 2 Summary for Subcatchment 1: D.A.1 Runoff = 0.07 cfs @ 12.06 hrs, Volume= 0.007 af, Depth> 0.29" Runoff by SCS TR-20 method, UH=SCS,Time Span=0.00-24.00 hrs,dt=0.01 hrs Type II 24-hr 1yr Rainfall=3.04" Area(sf) CN Description 10,635 55 Woods,Good, HSG B 1,226 85 Gravel roads,HSG B 803 61 >75%Grass cover,Good, HSG B 12,664 58 Weighted Average 12,664 100.00%Pervious Area ..r Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.6 Direct Entry, Summary for Subcatchment 2: D.A.2 Runoff = 0.14 cfs @ 12.22 hrs, Volume= 0.031 af, Depth> 0.20" Runoff by SCS TR-20 method, UH=SCS,Time Span=0.00-24.00 hrs,dt=0.01 hrs Type II 24-hr 1yr Rainfall=3.04" Area(sf) CN Description 78,953 55 Woods,Good, HSG B 829 85 Gravel roads, HSG B 968 61 >75%Grass cover,Good,HSG B .r. 80,750 55 Weighted Average 80,750 100.00%Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 18.0 Direct Entry, Summary for Subcatchment 3: D.A.3 Runoff = 0.42 cfs @ 12.16 hrs, Volume= 0.087 af, Depth> 0.20" d.. Runoff by SCS TR-20 method,UH=SCS,Time Span=0.00-24.00 hrs,dt=0.01 hrs Type II 24-hr 1yr Rainfall=3.04" Area(sf) CN Description 221,242 55 Woods,Good,HSG B 1,545 85 Gravel roads, HSG B 1,844 61 >75%Grass cover,Good, HSG B 224,631 55 Weighted Average 224,631 100.00%Pervious Area Pants Project Culvert Post-Development Type 1124-hr lyr Rainfall=3.04" Prepared by Shimp Engineering, P.C. Printed 7/10/2015 HydroCAD®9.10 s/n 07054 ©2011 HydroCAD Software Solutions LLC Page 3 Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 15.3 Direct Entry, awn Summary for Pond 3P: FOREBAY#1 Inflow Area= 5.157 ac, 0.00%Impervious, Inflow Depth> 0.20" for 1yr event Inflow = 0.42 cfs @ 12.16 hrs, Volume= 0.087 af Outflow = 0.22 cfs @ 12.62 hrs, Volume= 0.076 af, Atten=47%, Lag=27.2 min Primary = 0.22 cfs @ 12.62 hrs, Volume= 0.076 af ..r Routing by Stor-Ind method,Time Span=0.00-24.00 hrs,dt=0.01 hrs Peak Elev=681.13' @ 12.62 hrs Surf.Area=562 sf Storage=552 cf rr Plug-Flow detention time=95.9 min calculated for 0.076 af(87%of inflow) Center-of-Mass det.time=38.5 min( 1,011.1-972.6) Volume Invert Avail.Storage Storage Description #1 678.45' 3,447 cf Custom Stage Data(Prismatic)Listed below(Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 678.45 20 0 0 .. 680.00 163 142 142 682.00 868 1,031 1,173 684.00 1,406 2,274 3,447 Device Routing Invert Outlet Devices #1 Primary 680.95' 24.0" Round Culvert L=40.6' Ke=0.400 Inlet/Outlet Invert=680.95'/680.15' S=0.0197'1 Cc=0.900 n=0.013 Primary OutFlow Max=0.22 cfs @ 12.62 hrs HW=681.13' (Free Discharge) t1=Culvert (Inlet Controls 0.22 cfs @ 1.55 fps) Summary for Subcatchment 4: D.A.4 +- Runoff = 2.41 cfs @ 12.20 hrs, Volume= 0.464 af, Depth> 0.23" Runoff by SCS TR-20 method, UH=SCS,Time Span=0.00-24.00 hrs,dt=0.01 hrs Type II 24-hr lyr Rainfall=3.04" Area(sf) CN Description 995,292 55 Woods,Good, HSG B ... 11,644 85 Gravel roads, HSG B 53,293 61 >75%Grass cover,Good, HSG B 1,060,229 56 Weighted Average "® 1,060,229 100.00%Pervious Area Pants Project Culvert Post-Development Type 1124-hr lyr Rainfall=3.04" .. Prepared by Shimp Engineering, P.C. Printed 7/10/2015 HydroCAD®9.10 s/n 07054 ©2011 HydroCAD Software Solutions LLC Page 4 Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 18.2 Direct Entry, Summary for Pond 4P: FOREBAY#2 Inflow Area= 24.340 ac, 0.00%Impervious, Inflow Depth> 0.23" for 1yr event Inflow = 2.41 cfs @ 12.20 hrs, Volume= 0.464 af Outflow = 2.36 cfs @ 12.23 hrs, Volume= 0.447 af, Atten=2%, Lag= 1.9 min Primary = 2.36 cfs @ 12.23 hrs, Volume= 0.447 af Routing by Stor-Ind method,Time Span=0.00-24.00 hrs,dt=0.01 hrs Peak Elev=681.68' @ 12.23 hrs Surf.Area=660 sf Storage=901 cf ..r Plug-Flow detention time=26.6 min calculated for 0.447 af(96%of inflow) Center-of-Mass det.time=9.9 min(974.5-964.6) Volume Invert Avail.Storage Storage Description #1 678.60' 7,652 cf Custom Stage Data(Prismatic)Listed below •" Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 678.60 20 0 0 .. 680.00 164 129 129 682.00 753 917 1,046 684.00 1,472 2,225 3,271 686.00 2,909 4,381 7,652 Device Routing Invert Outlet Devices #1 Primary 681.12' 36.0" Round Culvert L=40.0' CPP,end-section conforming to fill, Ke=0.500 Inlet/Outlet Invert=681.12'/679.65' S=0.0368'/' Cc=0.900 n=0.011 Primary OutFlow Max=2.35 cfs @ 12.23 hrs HW=681.68' (Free Discharge) - L1=Culvert (Inlet Controls 2.35 cfs @ 2.56 fps) Summary for Subcatchment 5: D.A.5 Runoff = 0.09 cfs @ 12.16 hrs, Volume= 0.016 af, Depth> 0.23" Runoff by SCS TR-20 method, UH=SCS,Time Span=0.00-24.00 hrs,dt=0.01 hrs Type II 24-hr 1yr Rainfall=3.04" Area(sf) CN Description 35,036 55 Woods,Good, HSG B 1,060 85 Gravel roads, HSG B 1,263 61 >75%Grass cover,Good, HSG B 37,359 56 Weighted Average 37,359 100.00%Pervious Area Pants Project Culvert Post-Development Type 1124-hr lyr Rainfall=3.04" Mel Prepared by Shimp Engineering, P.C. Printed 7/10/2015 HydroCAD®9.10 s/n 07054 ©2011 HydroCAD Software Solutions LLC Page 5 Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 15.7 Direct Entry, Summary for Subcatchment 5A: POND DA Runoff = 0.40 cfs @ 12.00 hrs, Volume= 0.029 af, Depth> 0.29" Runoff by SCS TR-20 method, UH=SCS,Time Span=0.00-24.00 hrs,dt=0.01 hrs Type II 24-hr 1yr Rainfall=3.04" Area(sf) CN Description 39,396 55 Woods,Good, HSG B 3,650 85 Gravel roads, HSG B 9,721 61 >75%Grass cover,Good, HSG B 52,767 58 Weighted Average 52,767 100.00%Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Summary for Pond 5P: Level 2 Wet Pond Inflow Area= 33.419 ac, 0.00%Impervious, Inflow Depth> 0.22" for lyr event Inflow = 2.67 cfs @ 12.23 hrs, Volume= 0.600 af Outflow = 0.52 cfs @ 16.95 hrs, Volume= 0.412 af, Atten=81%, Lag=283.5 min Primary = 0.52 cfs @ 16.95 hrs, Volume= 0.412 af Routing by Stor-Ind method,Time Span=0.00-24.00 hrs,dt=0.01 hrs Peak Elev=682.42' @ 16.95 hrs Surf.Area=24,189 sf Storage=9,860 cf Plug-Flow detention time=251.2 min calculated for 0.411 af(69%of inflow) '°" Center-of-Mass det.time= 128.8 min ( 1,106.0-977.1) Volume Invert Avail.Storage Storage Description #1 682.00' 84,955 cf Custom Stage Data(Prismatic)Listed below(Recaic) Elevation Surf.Area Inc.Store Cum.Store ,.. (feet) (sq-ft) (cubic-feet) (cubic-feet) 682.00 22,442 0 0 684.00 30,705 53,147 53,147 685.00 32,911 31,808 84,955 Device Routing Invert Outlet Devices #1 Primary 676.00' 36.0" Round Culvert L= 100.0' Ke=0.400 Inlet/Outlet Invert=676.00'/674.00' 5=0.0200'/' Cc=0.900 n=0.013 #2 Device 1 682.00' 8.0"Vert.Orifice/Grate C=0.600 #3 Device 1 683.00' 48.0" Horiz.Riser C=0.600 Limited to weir flow at low heads #4 Primary 684.00' 6.0'long x 6.0'breadth Broad-Crested Rectangular Weir Pants Project Culvert Post-Development Type 1124-hr lyr Rainfall=3.04" Prepared by Shimp Engineering, P.C. Printed 7/10/2015 HydroCAD®9.10 s/n 07054 ©2011 HydroCAD Software Solutions LLC Page 6 Head(feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 3.50 4.00 4.50 5.00 5.50 Coef.(English) 2.37 2.51 2.70 2.68 2.68 2.67 2.65 2.65 2.65 2.65 2.66 2.66 2.67 2.69 2.72 2.76 2.83 Primary OutFlow Max=0.52 cfs @ 16.95 hrs HW=682.42' (Free Discharge) -1=Culvert (Passes 0.52 cfs of 80.91 cfs potential flow) ,., E2=Orifice/Grate (Orifice Controls 0.52 cfs @ 2.21 fps) 3=Riser (Controls 0.00 cfs) -4=Broad-Crested Rectangular Weir (Controls 0.00 cfs) Summary for Subcatchment 6: D.A.6 Runoff = 0.15 cfs @ 12.12 hrs, Volume= 0.020 af, Depth> 0.26" Runoff by SCS TR-20 method, UH=SCS,Time Span=0.00-24.00 hrs,dt=0.01 hrs Type II 24-hr 1yr Rainfall=3.04" Area(sf) CN Description 37,932 55 Woods,Good, HSG B 1,980 85 Gravel roads,HSG B 1,234 61 >75%Grass cover,Good, HSG B 41,146 57 Weighted Average 41,146 100.00%Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.7 Direct Entry, Summary for Subcatchment 7: D.A.7 Runoff = 0.07 cfs @ 12.10 hrs, Volume= 0.008 af, Depth> 0.28" Runoff by SCS TR-20 method, UH=SCS,Time Span=0.00-24.00 hrs,dt=0.01 hrs Type II 24-hr 1yr Rainfall=3.04" Area(sf) CN Description 11,732 55 Woods,Good, HSG B 1,007 85 Gravel roads, HSG B 1,703 61 >75%Grass cover,Good,HSG B 14,442 58 Weighted Average 14,442 100.00%Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.1 Direct Entry, dill Pants Project Culvert Post-Development Type 1124-hr 1yr Rainfall=3.04" �. Prepared by Shimp Engineering, P.C. Printed 7/10/2015 HydroCAD®9.10 s/n 07054 ©2011 HydroCAD Software Solutions LLC Page 7 Summary for Subcatchment 8: D.A.8 Runoff = 0.06 cfs @ 12.03 hrs, Volume= 0.004 af, Depth> 0.48" Runoff by SCS TR-20 method, UH=SCS,Time Span=0.00-24.00 hrs,dt=0.01 hrs Type II 24-hr 1yr Rainfall=3.04" Area(sf) CN Description 2,082 55 Woods,Good, HSG B 983 85 Gravel roads,HSG B .. 1,142 61 >75%Grass cover,Good, HSG B 4,207 64 Weighted Average 4,207 100.00%Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.3 Direct Entry, Summary for Subcatchment 9: D.A.9 Runoff = 0.16 cfs @ 12.07 hrs, Volume= 0.013 af, Depth> 0.45" Runoff by SCS TR-20 method, UH=SCS,Time Span=0.00-24.00 hrs,dt=0.01 hrs Type II 24-hr 1yr Rainfall=3.04" Area(sf) CN Description i.+ 6,982 55 Woods,Good, HSG B 2,796 85 Gravel roads, HSG B 4,932 61 >75%Grass cover,Good, HSG B 14,710 63 Weighted Average 14,710 100.00%Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.2 Direct Entry, Summary for Subcatchment 10: D.A.10 Runoff = 0.09 cfs @ 12.02 hrs, Volume= 0.006 af, Depth> 0.38" Runoff by SCS TR-20 method, UH=SCS,Time Span=0.00-24.00 hrs,dt=0.01 hrs Type II 24-hr 1yr Rainfall=3.04" Area(sf) CN Description 5,699 55 Woods,Good,HSG B .®. 1,258 85 Gravel roads, HSG B 1,741 61 >75%Grass cover,Good,HSG B 8,698 61 Weighted Average 8,698 100.00%Pervious Area Pants Project Culvert Post-Development Type 1124-hr lyr Rainfall=3.04" Prepared by Shimp Engineering, P.C. Printed 7/10/2015 HydroCAD®9.10 s/n 07054 ©2011 HydroCAD Software Solutions LLC Page 8 Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.0 Direct Entry, Summary for Subcatchment 11: D.A.11 Runoff = 0.11 cfs @ 11.98 hrs, Volume= 0.005 af, Depth> 0.52" Runoff by SCS TR-20 method, UH=SCS,Time Span=0.00-24.00 hrs,dt=0.01 hrs Type II 24-hr lyr Rainfall=3.04" Area(sf) CN Description 1,882 55 Woods,Good, HSG B ,„. 1,443 85 Gravel roads,HSG B 2,134 61 >75%Grass cover,Good, HSG B 5,459 65 Weighted Average 5,459 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.1 Direct Entry, Summary for Subcatchment 12: D.A.12 Runoff = 0.73 cfs @ 12.03 hrs, Volume= 0.042 af, Depth> 0.78" .. Runoff by SCS TR-20 method, UH=SCS,Time Span=0.00-24.00 hrs,dt=0.01 hrs Type II 24-hr 1yr Rainfall=3.04" Area(sf) CN Description 11,939 85 Gravel roads, HSG B 16,325 61 >75%Grass cover,Good,HSG B 28,264 71 Weighted Average 28,264 100.00%Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.3 Direct Entry, a Pants Project Culvert Post-Development Type 1124-hr 10yr Rainfall=5.54" ... Prepared by Shimp Engineering, P.C. Printed 7/10/2015 HydroCAD®9.10 s/n 07054 ©2011 HydroCAD Software Solutions LLC Page 9 MISummary for Subcatchment 1: D.A.1 Runoff = 0.64 cfs @ 12.02 hrs, Volume= 0.036 af, Depth> 1.47" a Runoff by SCS TR-20 method, UH=SCS,Time Span=0.00-24.00 hrs,dt=0.01 hrs Type II 24-hr 10yr Rainfall=5.54" a Area(sf) CN Description 10,635 55 Woods,Good,HSG B 1,226 85 Gravel roads, HSG B a 803 61 >75%Grass cover,Good, HSG B 12,664 58 Weighted Average 12,664 100.00%Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.6 Direct Entry, Summary for Subcatchment 2: D.A.2 Runoff = 2.39 cfs @ 12.13 hrs, Volume= 0.193 af, Depth> 1.25" Runoff by SCS TR-20 method, UH=SCS,Time Span=0.00-24.00 hrs,dt=0.01 hrs a Type II 24-hr 10yr Rainfall=5.54" Area(sf) CN Description a 78,953 55 Woods,Good,HSG B 829 85 Gravel roads, HSG B 968 61 >75%Grass cover,Good,HSG B a 80,750 55 Weighted Average 80,750 100.00%Pervious Area Tc Length Slope Velocity Capacity Description "r (min) (feet) (ft/ft) (ft/sec) (cfs) 18.0 Direct Entry, . Summary for Subcatchment 3: D.A.3 Runoff = 7.35 cfs @ 12.09 hrs, Volume= 0.539 af, Depth> 1.25" a Runoff by SCS TR-20 method,UH=SCS,Time Span=0.00-24.00 hrs,dt=0.01 hrs Type II 24-hr 10yr Rainfall=5.54" a Area(sf) CN Description 221,242 55 Woods,Good,HSG B 1,545 85 Gravel roads, HSG B a 1,844 61 >75%Grass cover,Good,HSG B 224,631 55 Weighted Average 224,631 100.00%Pervious Area a a Pants Project Culvert Post-Development Type 1124-hr 10yr Rainfall=5.54" +.. Prepared by Shimp Engineering, P.C. Printed 7/10/2015 HydroCAD®9.10 s/n 07054 ©2011 HydroCAD Software Solutions LLC Page 10 .. Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 15.3 Direct Entry, Summary for Pond 3P: FOREBAY#1 Inflow Area= 5.157 ac, 0.00%Impervious, Inflow Depth> 1.25" for 10yr event . Inflow = 7.35 cfs @ 12.09 hrs, Volume= 0.539 af Outflow = 7.19 cfs @ 12.12 hrs, Volume= 0.526 af, Atten=2%, Lag=1.5 min Primary = 7.19 cfs @ 12.12 hrs, Volume= 0.526 af .10 Routing by Stor-Ind method,Time Span=0.00-24.00 hrs,dt=0.01 hrs Peak Elev=682.09' @ 12.12 hrs Surf.Area=892 sf Storage= 1,251 cf Plug-Flow detention time= 18.2 min calculated for 0.526 af(98%of inflow) Center-of-Mass det.time=5.8 min(891.6-885.8) di" Volume Invert Avail.Storage Storage Description #1 678.45' 3,447 cf Custom Stage Data(Prismatic)Listed below(Recalc) .. Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 678.45 20 0 0 .. 680.00 163 142 142 682.00 868 1,031 1,173 684.00 1,406 2,274 3,447 Device Routing Invert Outlet Devices #1 Primary 680.95' 24.0" Round Culvert L=40.6' Ke=0.400 Inlet/Outlet Invert=680.95'/680.15' S=0.0197'1 Cc=0.900 n=0.013 Primary OutFlow Max=7.19 cfs @ 12.12 hrs HW=682.09' (Free Discharge) t1=Culvert (Inlet Controls 7.19 cfs @ 3.89 fps) Summary for Subcatchment 4: D.A.4 ... Runoff = 33.52 cfs @ 12.13 hrs, Volume= 2.682 af, Depth> 1.32" Runoff by SCS TR-20 method, UH=SCS,Time Span=0.00-24.00 hrs,dt=0.01 hrs Type II 24-hr 10yr Rainfall=5.54" Area(sf) CN Description 995,292 55 Woods,Good,HSG B . 11,644 85 Gravel roads, HSG B 53,293 61 >75%Grass cover,Good, HSG B 1,060,229 56 Weighted Average .. 1,060,229 100.00%Pervious Area Pants Project Culvert Post-Development Type 1124-hr 10yr Rainfall=5.54" .. Prepared by Shimp Engineering, P.C. Printed 7/10/2015 HydroCAD®9.10 s/n 07054 ©2011 HydroCAD Software Solutions LLC Page 11 Tc Length Slope Velocity Capacity Description No (min) (feet) (ft/ft) (ft/sec) (cfs) 18.2 Direct Entry, MIN Summary for Pond 4P: FOREBAY#2 Inflow Area= 24.340 ac, 0.00%Impervious, Inflow Depth> 1.32" for 10yr event "" Inflow = 33.52 cfs @ 12.13 hrs, Volume= 2.682 af Outflow = 33.27 cfs @ 12.14 hrs, Volume= 2.664 af, Atten=1%, Lag= 1.1 min Primary = 33.27 cfs @ 12.14 hrs, Volume= 2.664 af en Routing by Stor-Ind method,Time Span=0.00-24.00 hrs,dt=0.01 hrs Peak Elev=683.59' @ 12.14 hrs Surf.Area= 1,324 sf Storage=2,812 cf .. Plug-Flow detention time=5.7 min calculated for 2.663 af(99%of inflow) Center-of-Mass det.time=2.0 min(886.4-884.5) - Volume Invert Avail.Storage Storage Description #1 678.60' 7,652 cf Custom Stage Data(Prismatic)Listed below +M Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 678.60 20 0 0 .. 680.00 164 129 129 682.00 753 917 1,046 684.00 1,472 2,225 3,271 686.00 2,909 4,381 7,652 Device Routing Invert Outlet Devices #1 Primary 681.12' 36.0" Round Culvert L.40.0' CPP,end-section conforming to fill, Ke=0.500 .." Inlet/Outlet Invert=681.12'/679.65' S=0.0368'1 Cc=0.900 n=0.011 Primary OutFlow Max=33.25 cfs @ 12.14 hrs HW=683.59' (Free Discharge) .. t1=Culvert (Inlet Controls 33.25 cfs @ 5.35 fps) Summary for Subcatchment 5: D.A.5 Runoff = 1.29 cfs @ 12.09 hrs, Volume= 0.095 af, Depth> 1.32" Runoff by SCS TR-20 method, UH=SCS,Time Span=0.00-24.00 hrs,dt=0.01 hrs Type II 24-hr 10yr Rainfall=5.54" Area(sf) CN Description mr, 35,036 55 Woods,Good, HSG B 1,060 85 Gravel roads, HSG B 1,263 61 >75%Grass cover,Good, HSG B 37,359 56 Weighted Average 37,359 100.00%Pervious Area Pants Project Culvert Post-Development Type 1124-hr 10yr Rainfall=5.54" .. Prepared by Shimp Engineering, P.C. Printed 7/10/2015 HydroCAD®9.10 sin 07054 ©2011 HydroCAD Software Solutions LLC Page 12 Tc Length Slope Velocity Capacity Description twa (min) (feet) (ft/ft) (ft/sec) (cfs) 15.7 Direct Entry, Summary for Subcatchment 5A: POND DA Runoff = 3.24 cfs @ 11.97 hrs, Volume= 0.149 af, Depth> 1.47" Runoff by SCS TR-20 method, UH=SCS,Time Span=0.00-24.00 hrs,dt=0.01 hrs Type II 24-hr 10yr Rainfall=5.54" Area(sf) CN Description 39,396 55 Woods,Good, HSG B 3,650 85 Gravel roads, HSG B 9,721 61 >75%Grass cover,Good, HSG B 52,767 58 Weighted Average 52,767 100.00%Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) �. 5.0 Direct Entry, Summary for Pond 5P: Level 2 Wet Pond Inflow Area= 33.419 ac, 0.00%Impervious, Inflow Depth> 1.30" for 10yr event Inflow = 44.54 cfs @ 12.14 hrs, Volume= 3.627 af ... Outflow = 20.15 cfs @ 12.37 hrs, Volume= 3.096 af, Atten=55%, Lag=14.1 min Primary = 20.15 cfs @ 12.37 hrs, Volume= 3.096 af Routing by Stor-Ind method,Time Span=0.00-24.00 hrs,dt=0.01 hrs Peak Elev=683.58' @ 12.37 hrs Surf.Area=28,980 sf Storage=40,686 cf Plug-Flow detention time= 115.3 min calculated for 3.095 af(85%of inflow) "" Center-of-Mass det.time=47.3 min(933.7-886.4) Volume Invert Avail.Storage Storage Description #1 682.00' 84,955 cf Custom Stage Data(Prismatic)Listed below(Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 682.00 22,442 0 0 684.00 30,705 53,147 53,147 685.00 32,911 31,808 84,955 Device Routing Invert Outlet Devices #1 Primary 676.00' 36.0" Round Culvert L= 100.0' Ke=0.400 atm Inlet/Outlet Invert=676.00'/674.00' S=0.0200'/' Cc=0.900 n=0.013 #2 Device 1 682.00' 8.0"Vert.Orifice/Grate C=0.600 #3 Device 1 683.00' 48.0" Horiz.Riser C=0.600 Limited to weir flow at low heads ..r #4 Primary 684.00' 6.0'long x 6.0'breadth Broad-Crested Rectangular Weir Pants Project Culvert Post-Development Type 1124-hr 10yr Rainfall=5.54" Prepared by Shimp Engineering, P.C. Printed 7/10/2015 HydroCAD®9.10 s/n 07054 ©2011 HydroCAD Software Solutions LLC Page 13 Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 3.50 4.00 4.50 5.00 5.50 Coef.(English) 2.37 2.51 2.70 2.68 2.68 2.67 2.65 2.65 2.65 2.65 2.66 2.66 2.67 2.69 2.72 2.76 2.83 ahrimary OutFlow Max=20.14 cfs @ 12.37 hrs HW=683.58' (Free Discharge) -1=Culvert (Passes 20.14 cfs of 89.93 cfs potential flow) 12=Orifice/Grate (Orifice Controls 1.88 cfs @ 5.38 fps) 3=Riser (Weir Controls 18.27 cfs @ 2.50 fps) -4=Broad-Crested Rectangular Weir (Controls 0.00 cfs) Summary for Subcatchment 6: D.A.6 Runoff = 1.65 cfs @ 12.07 hrs, Volume= 0.110 af, Depth> 1.40" Runoff by SCS TR-20 method, UH=SCS,Time Span=0.00-24.00 hrs,dt=0.01 hrs Type II 24-hr 10yr Rainfall=5.54" Area(sf) CN Description 37,932 55 Woods,Good, HSG B .® 1,980 85 Gravel roads, HSG B 1,234 61 >75%Grass cover,Good, HSG B 41,146 57 Weighted Average 41,146 100.00%Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) MIN 13.7 Direct Entry, Summary for Subcatchment 7: D.A.7 Runoff = 0.63 cfs @ 12.07 hrs, Volume= 0.041 af, Depth> 1.47" Runoff by SCS TR-20 method, UH=SCS,Time Span=0.00-24.00 hrs,dt=0.01 hrs Type II 24-hr 10yr Rainfall=5.54" Area(sf) CN Description 11,732 55 Woods,Good, HSG B 1,007 85 Gravel roads, HSG B 1,703 61 >75%Grass cover,Good, HSG B 14,442 58 Weighted Average 14,442 100.00%Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.1 Direct Entry, int Pants Project Culvert Post-Development Type/I 24-hr 10yr Rainfall=5.54" .r Prepared by Shimp Engineering, P.C. Printed 7/10/2015 HydroCAD®9.10 s/n 07054 ©2011 HydroCAD Software Solutions LLC Page 14 �., Summary for Subcatchment 8: D.A.8 Runoff = 0.29 cfs @ 12.02 hrs, Volume= 0.016 af, Depth> 1.94" Runoff by SCS TR-20 method,UH=SCS,Time Span=0.00-24.00 hrs,dt=0.01 hrs Type II 24-hr 10yr Rainfall=5.54" Area(sf) CN Description 2,082 55 Woods,Good, HSG B 983 85 Gravel roads, HSG B 1,142 61 >75%Grass cover,Good, HSG B 4,207 64 Weighted Average 4,207 100.00% Pervious Area a- Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.3 Direct Entry, a Summary for Subcatchment 9: D.A.9 a Runoff = 0.87 cfs @ 12.05 hrs, Volume= 0.052 af, Depth> 1.85" Runoff by SCS TR-20 method, UH=SCS,Time Span=0.00-24.00 hrs,dt=0.01 hrs Type II 24-hr 10yr Rainfall=5.54" Area(sf) CN Description # ' 6,982 55 Woods,Good, HSG B 2,796 85 Gravel roads, HSG B 4,932 61 >75%Grass cover,Good, HSG B 14,710 63 Weighted Average 14,710 100.00%Pervious Area ,®. Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.2 Direct Entry, Summary for Subcatchment 10: D.A.10 Runoff = 0.55 cfs @ 12.00 hrs, Volume= 0.028 af, Depth> 1.70" Runoff by SCS TR-20 method, UH=SCS,Time Span=0.00-24.00 hrs,dt=0.01 hrs Type II 24-hr 10yr Rainfall=5.54" Area(sf) CN Description 5,699 55 Woods,Good, HSG B 1,258 85 Gravel roads,HSG B 1,741 61 >75%Grass cover,Good, HSG B 8,698 61 Weighted Average .., 8,698 100.00% Pervious Area Pants Project Culvert Post-Development Type 1124-hr 10yr Rainfall=5.54" Prepared by Shimp Engineering, P.C. Printed 7/10/2015 HydroCAD®9.10 s/n 07054 ©2011 HydroCAD Software Solutions LLC Page 15 Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.0 Direct Entry, Summary for Subcatchment 11: D.A.11 Runoff = 0.47 cfs @ 11.97 hrs, Volume= 0.021 af, Depth> 2.02" Runoff by SCS TR-20 method, UH=SCS,Time Span=0.00-24.00 hrs,dt=0.01 hrs Type II 24-hr 10yr Rainfall=5.54" Area(sf) CN Description 1,882 55 Woods, Good, HSG B .®� 1,443 85 Gravel roads, HSG B 2,134 61 >75%Grass cover,Good, HSG B 5,459 65 Weighted Average 5,459 100.00%Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.1 Direct Entry, Summary for Subcatchment 12: D.A.12 Runoff = 2.51 cfs @ 12.02 hrs, Volume= 0.137 af, Depth> 2.53" Runoff by SCS TR-20 method, UH=SCS,Time Span=0.00-24.00 hrs,dt=0.01 hrs Type Il 24-hr 10yr Rainfall=5.54" Area(sf) CN Description 11,939 85 Gravel roads, HSG B 16,325 61 >75%Grass cover,Good, HSG B 28,264 71 Weighted Average 28,264 100.00%Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.3 Direct Entry, Pants Project Culvert Post-Development Type 1124-hr 10Oyr Rainfall=9.07" lie Prepared by Shimp Engineering, P.C. Printed 7/10/2015 HydroCAD®9.10 s/n 07054 ©2011 HydroCAD Software Solutions LLC Page 16 �,. Summary for Pond 5P: Level 2 Wet Pond Inflow Area= 33.419 ac, 0.00%Impervious, Inflow Depth> 3.61" for 100yr event a Inflow = 157.71 cfs @ 12.12 hrs, Volume= 10.064 af Outflow = 101.24 cfs @ 12.23 hrs, Volume= 9.447 af, Atten=36%, Lag=6.6 min Primary = 101.24 cfs @ 12.23 hrs, Volume= 9.447 af Routing by Stor-Ind method,Time Span=0.00-24.00 hrs,dt=0.01 hrs Peak Elev=684.93' @ 12.23 hrs Surf.Area=32,759 sf Storage=82,695 cf Plug-Flow detention time=51.6 min calculated for 9.443 af(94%of inflow) Center-of-Mass det.time= 19.0 min(873.0-853.9) Volume Invert Avail.Storage Storage Description #1 682.00' 84,955 cf Custom Stage Data(Prismatic)Listed below(Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 682.00 22,442 0 0 684.00 30,705 53,147 53,147 685.00 32,911 31,808 84,955 Device Routing Invert Outlet Devices #1 Primary 676.00' 36.0" Round Culvert L= 100.0' Ke=0.400 Inlet/Outlet Invert=676.00'/674.00' S=0.0200 Cc=0.900 n=0.013 #2 Device 1 682.00' 8.0"Vert.Orifice/Grate C=0.600 #3 Device 1 683.00' 48.0" Horiz.Riser C=0.600 Limited to weir flow at low heads #4 Primary 684.00' 6.0'long x 6.0'breadth Broad-Crested Rectangular Weir Head(feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 3.50 4.00 4.50 5.00 5.50 Coef.(English) 2.37 2.51 2.70 2.68 2.68 2.67 2.65 2.65 2.65 2.65 2.66 2.66 2.67 2.69 2.72 2.76 2.83 erimary OutFlow Max=101.22 cfs @ 12.23 hrs HW=684.93' (Free Discharge) -1=Culvert (Passes 86.78 cfs of 99.40 cfs potential flow) t2=Orifice/Grate (Orifice Controls 2.71 cfs @ 7.76 fps) 3=Riser (Orifice Controls 84.07 cfs @ 6.69 fps) -4=Broad-Crested Rectangular Weir (Weir Controls 14.44 cfs @ 2.59 fps) w.. ow LU0 0 ri 0 c c — Cf •c W N L �f1 0011 a LOl1 M M cr N a -l-1 N N N Cr M MO cf C O O O O ri ri 0 0 0 0 0 0 0 lU O * 00 LO in m l0 O Tr O m l0 .--I N O 01 Lu u1 Tr Li Ln M Tr Ol m 00 u1 Ol V d• WO > N en M M u1 N en N N a-1 N .-i e-1 N N N N N 01 01 l0 N N .--I N O 0 e-I M M u1 u1 O o 0 0 0 0 0 0 0 0 0 0 -4 ri 0 0 0 0 0 0 0 0 WO t M * E to▪ CD > — O C 3 •N O w M Al M en en m en m m M m M m m LLY 0 Q += OW 0, u1 u1 OIJ N u1 ul O N N 00 l0 ri O O 0' ri ri e-I ri e-1 N r-I ri O e-i 0 2 N u O o 0 0 0 0 0 0 0 0',0 0 0 0 — U C ca • wZ d LL 0 N N M N 00 0 c» u1 N m N ri cn 2 LL o 0 0 0 o 0 0 0 0 0 0 0 0 O a) MO C .-•1I Ce N N N N N (Ni N N N N N N N N Q) 70 Y -•1N J N N N N NN N N N N N 13 .. Qo on on O 4 , M m a0 .0 ri M 'a ri M ?-1 O 0 O N N N m m ei e-I o 0 0 0 o O p N rr. 0 0 0 in u1 N N 0 00 N N N Ln 00 N .Q J N CrN N M M N O1 O N N O N Ln Q -O — Ln 4 4 4 4 4 4 4 u1 Ln u1 l0 lD Lfl cd AM eO u u, O M M N N m N O M O C ~ Ol cr. eN-i t c W ;-1 rm-1 eOl .N-I 00 I O 0 00 ul Cr Cr 00 00 to N Ol N 00 un MTr rn u 0 u1 u1 Ln N N N N O O O o o ri < 0 O .-i ri N� N O o 0 0 0 0 0 0 N U m 00Ln Tr d• 00 00 Le) N Ol N 00 u1 en 4 O OW Z O LI) V1 t11 N N N N 0 0 0 0 0 r-1c 0 0 e i ei n n 0 0 0 0 0 0 0 0 to U l0M N N N N m 0 .--I N N N 01 N < N 00 ri e-I 00 Ol m 0'N .-1 o d• O .0 o e-1 u1 ul N O O O d d O o 0 sz rn M M m M M m m m m m m m m m ,O O O OO O O O O O O O O O f0 a�lr 7 U V .-i N m M ** Tr u1 tD N 00 0, ' e-1 rNi MO F'"' 0 0 0 u 0 V 0 0 0 0 0 U 0 U N to N N N N N N to N N N NO 4/14/2015 Precipitation Frequency Data Server . �.�,;� NOAA Atlas 14,Volume 2,Version 3 ,, /16 Location name:Charlottesville,Virginia, US* _ noun Latitude: 38.0510°, Longitude: -78.6265° Elevation:677 ft* AIM '-0'>nEs co"k *source:Google Maps "%,,K,,..,../� POINT PRECIPITATION FREQUENCY ESTIMATES G.M.Bonnin,D.Martin,B.Lin,T.Parzybok,M.Yekta,and D.Riley ow NOAA,National Weather Service,Silver Spring,Maryland PF tabular I PF graphical I Maps & aerials M' PF tabular PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches)1 .in Average recurrence interval(years) Duration 1 2 5 10 25 50 100 200 500 1000 5-min 0.345 0.412 0.485 0.545 0.615 0.669 0.720 0.769 0.827 0.874 .1111 (0.311-0.382) (0.372-0.456) (0.437-0.536) (0.491-0.602) (0.551-0.678) (0.597-0.737) (0.638-0.794) (0.675-0.848) (0.718-0.916) (0.752-0.973) 10-min 0.550 0.658 0.776 0.872 0.981 1.07 1.15 1.22 1.31 1.38 (0.497-0.610) (0.595-0.729) (0.700-0.858) (0.786-0.963) (0.878-1.08) (0.950-1.17)1 (1.01-1.26) (1.07-1.34) (1.14-1.45) (1.18-1.53) 0.688 0.827 0.982 1.10 1.24 1.35 1.45 1.54 1.65 1.73 I m. 15-min (0.621-0.762) (0.748-0.916) (0.886-1.08) (0.994-1.22) (1.11-1.37) (1.20-1.49) (1.28-1.59) (1.35-1.70) (1.43-1.82) (1.49-1.92) i 1.14 1.40 1.60 1.84 2.03 2.22 2.39 2.62 2.80 0.943 30-min (0.852-1.04) (1.03-1.27) L(1.26-1.54) (1.44-1.77) (1.65-2.03) (1.81-2.24) (1.96-2.44) (2.10-2.64) (2.27-2.90) (2.41-3.12) 1 1.18 1.43 1.79 2.08 2.45 2.75 3.05 3.36 3.76 4.08 1 60-min (1.06-1.30) (1.30-1.59) (1.61-1.98) (1.88-2.30) (2.20-2.70) (2.46-3.03) (2.70-3.37) (2.95-3.71) (3.26-4.17) (3.51-4.55) J 2-hr 1.41 1.71 2.15 2.52 3.01 3.41 3.83 4.26 4.86 5.36 (1.25-1.59) (1.51-1.94) (1.90-2.43) (2.23-2.85) (2.64-3.38) (2.98-3.84) (3.32-4.30) (3.67-4.79) (4.13-5.48) (4.50-6.07) 3-hr 1.54 1.87 2.35 2.75 3.29 3.73 4.20 4.68 5.34 5.91 (1.36-1.76) (1.65-2.13) (2.07-2.68) (2.42-3.13) (2.88-3.73) (3.25-4.23) (3.62-4.75) (4.00-5.31) (4.51-6.08) (4.93-6.74) 6-hr ilia (1.77-2.24) 2.40 2.99 3.52 4.23 4.85 5.50 6.21 7.21 8.10 r (1.77-2.24) (2.14-2.71) (2.65-3.37) (3.10-3.96) (3.71-4.76) (4.21-5.44) (4.74-6.18) (5.28-6.99) (6.04-8.14) (6.68-9.17) 12-hr 2.51 3.04 3.79 4.48 5.45 6.32 7.26 8.29 9.83 11.2 (2.23-2.87) (2.69-3.46) (3.35-4.32) (3.94-5.10) (4.76-6.19) (5.45-7.16) (6.18-8.23) (6.96-9.40) (8.07-11.2) (9.05-12.8) 1 .r 3.04 3.68 4.69 5.54 6.80 m 7.88 9.07 10.4 12.3 14.0 L24-hr (2.74-3.40) (3.31-4.11) (4.21-5.24) (4.96-6.17) (6.04-7.56) (6.96-8.73) (7.94-10.0) (8.99-11.5) (10.5-13.6) (11.8 15.5) 2-day 3.58 4.33 5.51 1 6.47 7.86 9.03 10.3 11.7 13.7 15.4 (3.22-3.99) (3.91-4.84) (4.95-6.14) (5.80-7.20) (7.00-8.74) (7.98-10.0) (9.03-11.4) (10.2-13.0) (11.7-15.3) (13.0-17.2) M 3-day 3.81 4.61 5.86 6.87 8.35 9.58 10.9 12.4 14.5 16.2 (3.46-4.23) (4.19-5.12) (5.31-6.49) (6.21-7.61) (7.50-9.23) (8.55-10.6) (9.67-12.1) (10.9-13.7) (12.6-16.0) (13.9-18.0) 4-day 4.04 4.89 6.21 I 7.28 8.83 10.1 11.5 13.0 15.2 17.1 . (3.70-4.46) (4.47-5.40) (5.66-6.84) (6.63-8.01) (8.01-9.72) (9.13-11.1) l (10.3-12.7) (11.6-14.3) (13.4-16.8) (14.8-18.9) 4.69 5.65 7.06 1 8.21 9.86 11.2 12.7 14.2 16.5 18.4 7-day (4.30-5.13) (5.18-6.17) (6.46-7.71) (7.50-8.96) (8.96-10.8) (10.1-12.2) (11.4-13.8) (12.7-15.6) (14.5-18.1) (16.0-20.2) "` 10-day 5.32 6.39 7.88 9.08 10.8 12.1 ! 13.6 15.1 17.2 19.0 (4.90-5.77) (5.89-6.92) (7.26-8.53) (8.35-9.83) (9.85-11.7) (11.1-13.1) I (12.3-14.7) (13.6-16.4) (15.3-18.7) (16.8-20.7) 20-day 6.99 8.34 10.1 11.4 13.2 14.7 16.2 17.7 19.7 21.3 (6.54-7.51) (7.80-8.95) (9.40-10.8) (10.6-12.3) (12.3-14.2) (13.6-15.8) (14.9-17.4) (16.2-19.0) (17.9-21.3) (19.2-23.0) .0. 30-day 8.58 10.2 12.0 13.4 15.3 16.6 18.0 19.3 21.1 22.4 (8.07-9.15) (9.57-10.8) (11.3-12.8) (12.6-14.3) (14.3-16.3) (15.5-17.7) (16.8-19.2) (18.0-20.7) (19.5-22.6) (20.6-24.1) 10.7 12.7 14.8 16.4 18.4 19.9 21.3 22.7 24.5 25.8 45-day An (10.1-11.4) (11.9-13.4) (13.9-15.7) (15.4-17.3) (17.3-19.5) (18.7-21.1) (20.0-22.6) (21.2-24.2) (22.8-26.2) (23.9-27.6) 60-day 12.6 14.8 17.0 18.7 20.9 22.4 23.9 25.3 27.1 28.4 (11.9-13.3) (14.0-15.6) (16.1-18.0) (17.7-19.8) (19.7-22.0) (21.1-23.7) (22.5-25.3) (23.8-26.8) (25.4-28.8) (26.5-30.2) r. 1 Precipitation frequency(PF)estimates in this table are based on frequency analysis of partial duration series(PDS). Numbers in parenthesis are PF estimates at lower and upper bounds of the 90%confidence interval.The probability that precipitation frequency estimates(for a given duration and average recurrence interval)will be greater than the upper bound(or less than the lower bound)is 5%.Estimates at upper bounds are not checked against probable maximum precipitation(PMP)estimates and may be higher than currently valid PMP values. Please refer to NOAA Atlas 14 document for more information. am Back to Top PF graphical KIN http://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=38.0510&lon=-78.6265&data=depth&units=english&series=pds 1/4 4/14/2015 Precipitation Frequency Data Server PDS-based depth-duration-frequency(DDF) curves Latitude: 38.0510°, Longitude: -78.6265° 30 1 T 1 I 1 1 1 • 25 • • c • _c 20 Average recurrence interval w v - / (years) oc 15 — 2 �1. a n- — 10 5 - "= _ — 25 . - — 50 ?--r — 100 0 "�•"'•r 200 C C C C C 6. ►- .- > > >. •- •- t t m v > — 500 1.01 Tb 10 v v vv O 8 N r.41 n O O p Min ID — 1000 Duration ar 30 I 1 1 1 I r 25 ...._ C 20 - n .. v o0 15ro ro ,.. 10 :._�. 0 .gym.... ., r t r 1 2 5 10 25 50 100 200 500 1000 Average recurrence interval (years) NOAA Atlas 14,Volume 2,Version 3 Created(GMT):Tue Apr 14 20:57:04 2015 Duration wi. ---- 5-min — 2-day — 10-ruin — 3-day 15-mm — 4-day — 30-min — 7-day AIN - 60-nun — 10-day — 24w — 20-day — 34w — 30-day — 6-hr — 45-day gal — 12-hr — 60-day — 24-hr r. http://hdsc.nws.noxa.gov/hdsc/pfds/pfds_printpage.html?lat=38.0510&Ion=-78.6265&data=depth&units=english&series=pds 2/4 4/14/2015 Precipitation Frequency Data Server MS illiN NM MN all Mk Back to Top Maps & aerials Small scale terrain I s -Morgantown- T --. --1-0./,_. :.-_ - .-Hagerstown —k kv r tp i rfir:;, �;'' ' 'T°M:ARYEAND N t ,t 9' Parkersburg • / t< , " l . . ,L .`�1 ° t ,� /. , - ! 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WEST Leer! 631 6$3 WI / T48 PEACOCK WV 2 km Map Report a map error Lar.e scale aerial CUC?gl( 2 km Imagery N Report a map error Back to Top US Department of Commerce National Oceanic and Atmospheric Administration National Weather Service Office of Hydrologic Development 1325 East West Highway Silver Spring,MD 20910 Questions?:HDSC.Questionst noaa.gov Disclaimer http://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=38.0510&Ion=-78.6265&data=depth&units=english&series=pds 4/4 `.rrr. .....'r ir.rffr .rr.r rrr.r r.rr. MIIIMINIII ..r..ri ....rr rrr`r ..rr6 .r.r.li rrrr. r10111rli Custom Soil Resource Report Map—Hydrologic Soil Group M M 707900 708000 708100 708200 708300 708400 708500 708600 708700 708800 38°3'10"N 38°3'10"N a - . & .�- ViaA r "\\........y, ., i IN A Co4htryLh a' a I .?, '41 7 , N 8 a <dyto n Dr a a r V 1 S�yiih e r.a s ` P.O. a 1 a N a 0 `a N a Q M N a grs, ae5e 4 ii a N M ,- .:J. 1 a N a AP, N a 44 , N , ) , V N V s 0 Nca,v,dge set a vi S m N v N ti N .- 4 4 g3 Langford PI o n N o y� 7 a p i \ .' I N F k $Jjsv y 81\1;11‘.* a N 38°2 16"N v 38°2'16"N 708000 708100 708200 708300 708400 708500 708600 708700 708800 708900 3 3 Map Scale:1:4,590 if punted on B portrait(11"x 17")sheet n Meters N 0 50 100 200 300 Feet /V 0 200 400 800 1200N WGS Map Projection:Web Mercator Corner coordinates:WGS84 Edge tics;IJTM Zone 1784 27 Custom Soil Resource Report Table—Hydrologic Soil Group Hydrologic Soil Group—Summary by Map Unit—Albemarle County,Virginia(VA003) Map unit symbol Map unit name Rating Acres in AOI Percent of AOI i 4C Ashe loam,7 to 15 B 5.4 4.2% percent slopes 4D Ashe loam, 15 to 25 B 20.8 16.2% percent slopes 4E Ashe loam,25 to 45 B 25.4 19.7% percent slopes rr 14D Chester loam, 15 to 25 B 25.4 19.8% percent slopes 34B Glenelg loam,2 to 7 B 1.7 1.3% percent slopes 36B Hayesville loam,2 to 7 B 7.3 5.7% percent slopes 36C Hayesville loam,7 to 15 B 23.5 18.3% percent slopes 36D Hayesville loam, 15 to 25 B 6.5 5.1% percent slopes 37C3 Hayesville clay loam,7 to B 8.6 6.7% 15 percent slopes, severely eroded 37D3 Hayesville clay loam, 15 B 2.0 1.6% to 25 percent slopes, severely eroded 56B Meadowville loam,2 to 7 A 1.8 1.4% .• percent slopes Totals for Area of Interest 128.5 100.0% WO Rating Options—Hydrologic Soil Group ... Aggregation Method: Dominant Condition Component Percent Cutoff: None Specified Tie-break Rule: Higher so orra our a. 29