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Home My WebLink AboutSW5191001_SW Report_2020042022 Davie LLC SEA, PLLC Project Overview: 22 Davie LLC will consist of a 22,000 sf manufacturing site and warehouse located at 1217 Harold Andrews Rd approximately 1.1 miles northeast of the intersection of Old US 421 and Harold Andrews Road in Chatham County, Siler City, NC. The project parcel is approximately 13.56 acres and is almost entirely wooded. The soils on site are classified as Hydrologic Soil Group (HSG) D. The site does not lie within a special flood hazard area per FIRM Panel 3710876200K. There is an intermittent stream located on site, per USGS Topo maps that runs from southwest to northeast across the western portion of the parcel. There are no jurisdictional wetlands on site. The entire site drains to an unnamed tributary of Rocky River, surface water classification C, that is part of the Cape Fear River Basin. Stormwater Requirements: This project must comply with stormwater rules set forth by the Town of Siler City, NC and NCDEQ. The maximum built upon area for Siler City low-density is 7%, while NCDEQ has a 24% built upon area low-density limit. This project will have a proposed built upon area density of 6.69%. This project will utilize the use of sheet flow and vegetated conveyances to transport all stormwater runoff. Therefore, since the project falls below the BUA limits, this will be classified a Low-Density Stormwater Project by both the Town of Siler City and NCDEQ. No permanent primary SCM’s are provided as a part of this project. A 100 ft buffer is required along all perennial streams and a 50 ft buffer is required along all intermittent streams. This buffer has been provided and shown on applicable plan sheets, however the distance from the project limits to the existing stream buffer is +/-115LF. There is no proposed disturbance inside the stream buffer. Stormwater Treatment: As a low-density stormwater project, primary permanent stormwater control measures are not required. Two permanent grass lines swales and the use of sheet flow will provide water quality treatment. All areas in the project site must remain vegetated and properly maintained to ensure that stormwater runoff does not create erosion control issues. The project as proposed, meets all the stormwater requirements set forth by the Town of Siler City and NCDEQ. Refer the to “Attachments” for more information. 22 Davie LLC SEA, PLLC Attachments: - DA-1 Existing Site Area Map - DA-2 Proposed Site Area Map - DA-3 Driveway Pipe Drainage Area Map - DA-4 Vegetated Swale Drainage Area Map - USGS Topo Map - NRCS Hardbound Soils Map - Hydrologic Soils Group Map - FIRM Panel 3710874200J - Aerial - Permanent Ditch Sizing Calculations EX I S T I N G C O N C R E T E H a r o l d A n d r e w s R d S R 1 3 1 6 6 0 ' R / WBASIC MACHINERY CO INC.DB/PG:828/270PB/PG:89/34PARCEL ID:66749PIN#:8762-01-48-0000ZONING: A-REX I S T I N G G R A V E L EXI S T I N G C O N C R E T E (M A I N E N T R A N C E ) Co n c r e t e 15" R C P 15" R C P WILLIAM F MILHOLENDB/PG:318 / 48PB/PG: 89 / 34PARCEL ID: 61149PIN #: 8762-01-49-5125ZONING: LIUS HWY 421DAVIS MARY FRANCES LIFE ESTATEDB/PG:977/136PARCEL ID: 13732PIN #: 876201483145N C D O T R I G H T O F W A Y DRAWING LEGENDSheet22 DAVIE LLC Summey Engineering Associates, PLLC Engineering - Land Planning - Consulting P.O. Box 968 - Asheboro, NC 27204 Ph: 336-328-0902 / Fx: 336-328-0922 Email: info@asheboro.com NC Professional Engineering Firm License No. P-0336 EXISTING SITE AREA MAPDrawn by:Checked by:ZHGSEA Job No:Date:E-5885JAN. 2020DA-1HMSJCHATHAM COUNTY - SILER CITY - NORTH CAROLINA 1217 HAROLD ANDREWS RD P:\E-5885 Milholen-basic machinery\DWG\Civil Site\Drainage - 22 Davie - 01-02-20.dwg, 1/13/2020 1:23:43 PM, Zach,_AutoCAD PDF (General Documentation).pc3 H a r o l d A n d r e w s R d S R 1 3 1 6 6 0 ' R / WBASIC MACHINERY CO INC.DB/PG:828/270PB/PG:89/34PARCEL ID:66749PIN#:8762-01-48-0000ZONING: A-R9 75' T r u c k 15" R C P 15" R C P WILLIAM F MILHOLENDB/PG:318 / 48PB/PG: 89 / 34PARCEL ID: 61149PIN #: 8762-01-49-5125ZONING: LIUS HWY 421DAVIS MARY FRANCES LIFE ESTATEDB/PG:977/136PARCEL ID: 13732PIN #: 876201483145N C D O T R I G H T O F W A Y PROPOSEDSTORAGEPROPOSEDSTORAGEVA N DRAWING LEGENDSheetSummey Engineering Associates, PLLC Engineering - Land Planning - Consulting P.O. Box 968 - Asheboro, NC 27204 Ph: 336-328-0902 / Fx: 336-328-0922 Email: info@asheboro.com NC Professional Engineering Firm License No. P-0336 PROPOSED SITE AREA MAPDrawn by:Checked by:ZHGSEA Job No:Date:E-5885JAN. 2020DA-2HMSJCHATHAM COUNTY - SILER CITY - NORTH CAROLINA 22 DAVIE LLC 1217 HAROLD ANDREWS RD P:\E-5885 Milholen-basic machinery\DWG\Civil Site\Drainage - 22 Davie - 01-02-20.dwg, 1/13/2020 1:23:45 PM, Zach,_AutoCAD PDF (General Documentation).pc3 Harold Andrews RdSR 1316 60' R/W 915" RCP NCDOT RIGHT OF WAYVAN DRAWING LEGENDSheetSummey Engineering Associates, PLLC Engineering - Land Planning - Consulting P.O. Box 968 - Asheboro, NC 27204 Ph: 336-328-0902 / Fx: 336-328-0922 Email: info@asheboro.com NC Professional Engineering Firm License No. P-0336 DRIVEWAY PIPE DRAINAGE AREA MAPDrawn by:Checked by:ZHGSEA Job No:Date:E-5885JAN. 2020DA-3HMSJCHATHAM COUNTY - SILER CITY - NORTH CAROLINA 22 DAVIE LLC 1217 HAROLD ANDREWS RD P:\E-5885 Milholen-basic machinery\DWG\Civil Site\Drainage - 22 Davie - 01-02-20.dwg, 1/13/2020 1:23:50 PM, Zach,_AutoCAD PDF (General Documentation).pc3 H a r o l d A n d r e w s R d S R 1 3 1 6 6 0 ' R / W 9 75' Truck 15 " R C P US HWY 421N C D O T R I G H T O F W A Y PROPOSEDSTORAGEPROPOSEDSTORAGEV A N DRAWING LEGENDSheetSummey Engineering Associates, PLLC Engineering - Land Planning - Consulting P.O. Box 968 - Asheboro, NC 27204 Ph: 336-328-0902 / Fx: 336-328-0922 Email: info@asheboro.com NC Professional Engineering Firm License No. P-0336 VEGETATED SWALE DRAINAGE AREA MAPDrawn by:Checked by:ZHGSEA Job No:Date:E-5885JAN. 2020DA-4HMSJCHATHAM COUNTY - SILER CITY - NORTH CAROLINA 22 DAVIE LLC 1217 HAROLD ANDREWS RD P:\E-5885 Milholen-basic machinery\DWG\Civil Site\Drainage - 22 Davie - 01-02-20.dwg, 1/13/2020 1:23:55 PM, Zach,_AutoCAD PDF (General Documentation).pc3 59 60 61 62 63 64 65 66 67 68 69 70 58 3971000mN 59 60 61 62 63 64 65 66 67 68 69 70 3958000mN 71 37 38 39 40 41 42 43 44 4536 646 000mE 37 38 39 40 41 42 43 44 45636000mE 46 35.7500° 35.8750° -79.5000°-79.3750° 35.8750° 35.7500° -79.3750°-79.5000° QUADRANGLE LOCATION CRUTCHFIELD CROSSROADS QUADRANGLE NORTH CAROLINA 7.5-MINUTE SERIES CRUTCHFIELD CROSSROADS, NC 2019 Expressway Local Connector ROAD CLASSIFICATION Ramp 4WD Secondary Hwy Local Road Interstate Route State RouteUS Route W X . /H U.S. DEPARTMENT OF THE INTERIOR U.S. GEOLOGICAL SURVEY This map was produced to conform with the National Geospatial Program US Topo Product Standard, 2011. A metadata file associated with this product is draft version 0.6.18 CONTOUR INTERVAL 10 FEET NORTH AMERICAN VERTICAL DATUM OF 1988 SCALE 1:24 000 1000 500 0 METERS 1000 2000 21KILOMETERS00.51 1 0.5 0 MILES 1 1000 0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 FEET × 0°55´ 16 MILS 8°50´ 157 MILS UTM GRID AND 2019 MAGNETIC NORTH DECLINATION AT CENTER OF SHEET PV Grid Zone Designation 17S U.S. National Grid 100,000 - m Square ID NORTH CAROLINA 1 Kimesville 8 Siler City NE 2 Snow Camp 3 Saxapahaw 4 Liberty 5 Silk Hope 6 Coleridge 7 Siler City ADJOINING QUADRANGLES 2 6 4 1 3 7 8 5 Imagery.....................................................NAIP, May 2016 - November 2016 Roads......................................... U.S. Census Bureau, 2016 Names............................................................................GNIS, 1980 Hydrography...............................National Hydrography Dataset, 1899 - 2018 Contours............................................National Elevation Dataset, 2008 Boundaries..............Multiple sources; see metadata file 2017 - 2018 Wetlands.................FWS National Wetlands Inventory 1983 North American Datum of 1983 (NAD83) World Geodetic System of 1984 (WGS84). Projection and 1 000-meter grid:Universal Transverse Mercator, Zone 17S Produced by the United States Geological Survey This map is not a legal document. Boundaries may be generalized for this map scale. Private lands within government reservations may not be shown. Obtain permission before entering private lands. PROJECT SITE PROJECT SITE FLOOD HAZARD INFORMATIO N SPECIAL FLOOD HAZARD AR EAS OTHER AREAS OF FLOOD HAZARD OTHER AREAS GENERAL STRUCTURES Without Base Flood Elevation (BFE) With BFE or Depth Regulatory Floodway Areas Determined to be Outside the 0.2% Annual Chance Floodplain Non-accredited Levee, Dike, or Floodwall Zone A,V, A99 Zone AE, AO, AH, VE, AR Zone X HTTP://FRIS.NC.GOV/FRIS THE INFORMATION DEPICTED ON THIS MAP AND SUPPORTING DOCUMENTATION ARE ALSO AVAILABLE IN DIGITAL FORMAT AT NORTH CAROLIN A FLOODPLAIN MAPPING PROGRAM FLOOD INSURANCE RATE MAP NORTH CAROLIN A PANEL SEE FIS REPORT FOR ZONE DESCRIPTIONS AND INDEX MAP Cross Sections with 1% Annual Chance Water Surface Elevation (BFE) Coastal Transect OTHER FEATURES Profile Baseline Hydrographic Feature Limit of Study Limit of Moderate Wave Action (LiMWA) Jurisdiction Boundary Accredited or Provisionally Accredited Levee, Dike, or Floodwall Coastal Transect Baseline SCA LE 1 inch = 500 feet Map Projection: North Carolina State Plane Projection Feet (Zone 3200) Datum: NAD 1983 (Horizontal), NAVD 1988 (Vertical) PANEL LOCATOR LOGO LOGO NOTES TO USERS For information and questions about this map, available products associated with this FIRM including historic versions of this FIRM, how to order products or the National Flood Insurance Program in general, please call the FEMA Map Information eXchange at 1-877-FEMA-MAP (1-877-336-2627) or visit the FEMA Map Service Center website at http://msc.fema.gov. An accompanying Flood Insurance Study report, Letter of Map Revision (LOMR) or Letter of Map Amendment (LOMA) revising portions of this panel, and digital versions of this FIRM may be available. Visit the North Carolina Floodplain Mapping Program website at http://www.ncfloodmaps.com, or contact the FEMA Map Service Center. Communities annexing land on adjacent FIRM panels must obtain a current copy of the adjacent panel as well as the current FIRM Index. These may be ordered directly from the Map Service Center at the number listed above. For community and countywide map dates refer to the Flood Insurance Study report for this jurisdiction. To determine if flood insurance is available in the community, contact your Insurance agent or call the National Flood Insurance Program at 1-800-638-6620. Flood Insurance Study (FIS) means an examination, evaluation, and determination of flood hazards, corresponding water surface elevations, flood hazard risk zones, and other flood data in a community issued by the North Carolina Floodplain Mapping Program (NCFMP). The Flood Insurance Study (FIS) is comprised of the following products used together: the Digital Flood Hazard Database, the Water Surface Elevation Rasters, the digitally derived, autogenerated Flood Insurance Rate Map and the Flood Insurance Survey Report. A Flood Insurance Survey is a compilation and presentation of flood risk data for specific watercourses, lakes, and coastal flood hazard areas within a community. This report contains detailed flood elevation data, data tables and FIRM indices. When a flood study is completed for the NFIP, the digital information, reports and maps are assembled into an FIS. Information shown on this FIRM is provided in digital format by the NCFMP. Base map information shown on this FIRM was provided in digital format by the NCFMP. The source of this information can be determined from the metadata available in the digital FLOOD database and in the Technical Support Data Notebook (TSDN). ACCREDITED LEVEE NOTES TO USERS: If an accredited levee note appears on this panel check with your local community to obtain more information, such as the estimated level of protection provided (which may exceed the 1-percent-annual-chance level) and Emergency Action Plan, on the levee system(s) shown as providing protection. To mitigate flood risk in residual risk areas, property owners and residents are encouraged to consider flood insurance and floodproofing or other protective measures. For more information on flood insurance, interested parties should visit the FEMA Website at http://www.fema.gov/business/nfip/index.shtm. PROVISIONALLY ACCREDITED LEVEE NOTES TO USERS: If a Provisionally Accredited Levee (PAL) note appears on this panel, check with your local community to obtain more information, such as the estimated level of protection provided (which may exceed the 1-percent-annual-chance level) and Emergency Action Plan, on the levee system(s) shown as providing protection. To maintain accreditation, the levee owner or community is required to submit the data and documentation necessary to comply with Section 65.10 of the NFIP regulations. If the community or owner does not provide the necessary data and documentation or if the data and documentation provided indicates the levee system does not comply with Section 65.10 requirements, FEMA will revise the flood hazard and risk information for this area to reflect de-accreditation of the levee system. To mitigate flood risk in residual risk areas, property owners and residents are encouraged to consider flood insurance and floodproofing or other protective measures. For more information on flood insurance, interested parties should visit the FEMA Website at http://www.fema.gov/business/nfip/index.shtm. LIMIT OF MODERATE WAVE ACTION NOTES TO USERS: For some coastal flooding zones the AE Zone category has been divided by a Limit of Moderate Wave Action (LiMWA). The LiMWA represents the approximate landward limit of the 1.5-foot breaking wave. The effects of wave hazards between the VE Zone and the LiMWA (or between the shoreline and the LiMWA for areas where VE Zones are not identified) will be similar to, but less severe than those in the VE Zone. COASTAL BARRIER RESOURCES SYSTEM (CBRS) NOTE This map may include approximate boundaries of the CBRS for informational purposes only. Flood insurance is not available within CBRS areas for structures that are newly built or substantially improved on or after the date(s) indicated on the map. For more information see http://www.fws.gov/cbra, the FIS Report, or call the U.S. Fish and Wildlife Service Customer Service Center at 1-800-344-WILD. CBRS Area Other wise Protected Area Channel, Culvert, or Storm Sewer 0.2% Annual Chance Flood Hazard, Areas of 1% Annual Chance Flood with Average Depth Less Than One Foot or With Drainage Areas of Less Than One Square Mile Future Conditions 1% Annual Chance Flood Hazard Area with Reduced Flood Risk due to Levee See Notes Zone X Zone X Zone X 8762 1:6,000 %, 012 18.2 !( 8 1860000 FEET 720000 FEET 1860000 FEET 730000 FEET 1870000 FEET 730000 FEET 1870000 FEET 720000 FEET This digital Flood Insurance Rate Map (FIRM) was produced through a unique cooperative partnership between the State of North Carolina and the Federal Emergency Management Agency (FEMA). The State of North Carolina has implemented a long term approach to floodplain management to decrease the costs associated with flooding. This is demonstrated by the State's commitment to map flood hazard areas at the local level. As a part of this effort, the State of North Carolina has joined in a Cooperating Technical State agreement with FEMA to produce and maintain this digital FIRM. NATIONAL FLOOD INSURANCE PROGRAM £¤ 421 £¤ 64 £¤ 421 £¤ 64 £¤ 421 Loves Creek Tributary 3 TOWN OF SILER CITY 370058 TOWN OF SILER CITY 370058 TOWN OF SILER CITY 370058 TOWN OF SILER CITY 370058 TOWN OF SILER CITY ETJ 370058 TOWN OF SILER CITY ETJ 370058 TOWN OF SILER CITY ETJ 370058 TOWN OF SILER CITY ETJ 370058 ZONE AE ZONE AE ZONE AE ZONE AE i 068 i 158 i 062 i 074 i 078 i 071 i 144 i 153 i 124 i 084 i 140 i 114 i 099 i 082 i 108 i 120 i 064 i 166 i 095 i 104 i 059 i 089 i 111 i 082 i 048 i 060 i 072 i 129 i 149 i 135 Z3359Z EZ1258EZ1259 EZ1260 EZ1261EZ1265 EZ2847 79°26'30"W 79°26'30"W 79°27'0"W 79°27'0"W 79°27'30"W 79°27'30"W 79°28'0"W 79°28'0"W 35°45'0"N 35°45'0"N 35°44'30"N 35°44'30"N 35°44'0"N 35°44'0"N Guilford Alamance Orange Durham Wake Randolph Chatham Moore Lee Harnett 8624 8644 8664 8685 8695 9605 9615 9625 9635 9645 9685 9695 0604 0624 8746 8766 9727 9737 9746 9767 0717 0727 8786 8796 9706 9716 9726 9736 9766 9776 9786 9796 0706 0716 0726 8724 8744 8764 8784 9704 9725 9735 9745 9755 9765 9775 9784 0704 0725 9724 9734 9744 9754 9764 9774 0724 8722 8742 8763 8773 8782 9702 9722 9743 9753 9763 9773 9782 0703 0713 8762 8772 9742 9752 9762 9772 0702 0712 8720 8741 8751 8761 8771 8780 9700 9721 9731 9741 9751 9761 9771 9780 0701 0711 8740 8750 8760 8770 9720 9730 9740 9750 9760 9770 0700 0710 8628 8648 8668 8688 9608 9628 9648 9669 9679 9689 9699 0608 9668 9678 9688 9698 8626 8666 8686 9606 9626 9647 9657 9666 9687 9697 0606 0626 9646 9686 9696 8684 8694 9604 9614 9624 I 0 500 1,000250 Feet 0 150 30075 Meters BM5510 D Nor th Carolina Geodetic Survey bench mark BM5510 ? BM5510 z National Geodetic Survey bench mark Contractor Est. NCFMP Survey bench mark Panel Contains: COMMUNITY CID PANEL SUFFIX 8762370058 KSILER CITY,TOWN OF VERSION NUMBER 2.3.3.2 MAP NUMBER 3710876200K MAP REVISED November 17, 2017 PROJECT SITE PROJECT SITE 3.85 CFS MAX(See DA-4)15" RCP-PIPE A - MAX FLOW 1.2 CFS MAX15" RCP DRIVEWAY PIPE0.73 AC (SEE DA-5)7.52 IN/HR0.22 Summey Engineering Associates, PLLC Project:Basic Machinery Job Number:E-5885 Channel Flow Equations Temporary Ditch 1 - Phase 1 Hydraulic Radius R = A/Pw 0.643462 Area A =6 sf Wetted Perimeter Pw = 9.324555 ft Channel Slope S =0.0238 ft/ft Mannings Coeff.n = 0.02 Trapazoidal Ditch Bottom Width 3 ft Side Slope 3 :1 Top Width 9 ft Depth 1 ft Manning Equation Q = (1.49/n)*A*R2/3*S1/2 Q = 51.40 cfs (Ditch Maximum) Drainage Area Type Area (AC)C Bare Earth 0.75 0.5 Impervious 0.00 0.9 Q =CIA C 0.50 I 7.52 in/hr (10 yr - 5 min Storm) A 0.75 ac Q 2.82 cfs (Max Required) Depth of Flow 0.215 ft (@ required Flow) Q 2.868766 cfs A 0.783675 sf R 0.179751 Pw 4.359779 ft Top Width 4.29 ft Outlet Velocity (V)= Q/A V 3.660657 ft/s LINER IS REQUIRED Summey Engineering Associates, PLLC Project:Basic Machinery Job Number:E-5885 Channel Flow Equations Temporary Ditch 1 - Phase 2 Hydraulic Radius R = A/Pw 0.643462 Area A =6 sf Wetted Perimeter Pw = 9.324555 ft Channel Slope S =0.0238 ft/ft Mannings Coeff.n = 0.02 Trapazoidal Ditch Bottom Width 3 ft Side Slope 3 :1 Top Width 9 ft Depth 1 ft Manning Equation Q = (1.49/n)*A*R2/3*S1/2 Q = 51.40 cfs (Ditch Maximum) Drainage Area Type Area (AC)C Bare Earth 0.56 0.5 Impervious 0.19 0.9 Q =CIA C 0.60 I 7.52 in/hr (10 yr - 5 min Storm) A 0.75 ac Q 3.39 cfs (Max Required) Depth of Flow 0.237 ft (@ required Flow) Q 3.404903 cfs A 0.879507 sf R 0.195493 Pw 4.49892 ft Top Width 4.422 ft Outlet Velocity (V)= Q/A V 3.871377 ft/s LINER IS REQUIRED Summey Engineering Associates, PLLC Project:Basic Machinery Job Number:E-5885 Channel Flow Equations Permanent Ditch 1 - Construction Phase Hydraulic Radius R = A/Pw 0.70643 Area A =8 sf Wetted Perimeter Pw = 11.32456 ft Channel Slope S =0.02 ft/ft Mannings Coeff.n = 0.02 Trapazoidal Ditch Bottom Width 5 ft Side Slope 3 :1 Top Width 11 ft Depth 1 ft Manning Equation Q = (1.49/n)*A*R2/3*S1/2 Q = 66.86 cfs (Ditch Maximum) Drainage Area Type Area (AC)C Bare Earth 0.56 0.5 Impervious 0.44 0.9 Q =CIA C 0.68 I 7.52 in/hr (10 yr - 5 min Storm) A 1.00 ac Q 5.08 cfs (Max Required) Depth of Flow 0.239 ft (@ required Flow) Q 5.08344 cfs A 1.366363 sf R 0.209836 Pw 6.511569 ft Top Width 6.434 ft Outlet Velocity (V)= Q/A V 3.720417 ft/s LINER IS REQUIRED Summey Engineering Associates, PLLC Project:Basic Machinery Job Number:E-5885 Channel Flow Equations Permanent Ditch 2 - Construction Phase Hydraulic Radius R = A/Pw 0.70643 Area A =8 sf Wetted Perimeter Pw = 11.32456 ft Channel Slope S =0.02 ft/ft Mannings Coeff.n = 0.02 Trapazoidal Ditch Bottom Width 5 ft Side Slope 3 :1 Top Width 11 ft Depth 1 ft Manning Equation Q = (1.49/n)*A*R2/3*S1/2 Q = 66.86 cfs (Ditch Maximum) Drainage Area Type Area (AC)C Bare Earth 0.25 0.5 Impervious 0.58 0.9 Q =CIA C 0.78 I 7.52 in/hr (10 yr - 5 min Storm) A 0.83 ac Q 4.87 cfs (Max Required) Depth of Flow 0.233 ft (@ required Flow) Q 4.86591 cfs A 1.327867 sf R 0.20512 Pw 6.473621 ft Top Width 6.398 ft Outlet Velocity (V)= Q/A V 3.664456 ft/s LINER IS REQUIRED Summey Engineering Associates, PLLC Project:Basic Machinery Job Number:E-5885 Channel Flow Equations Permanent Ditch 1 - Post Construction Hydraulic Radius R = A/Pw 0.70643 Area A =8 sf Wetted Perimeter Pw = 11.32456 ft Channel Slope S =0.02 ft/ft Mannings Coeff.n = 0.03 Trapazoidal Ditch Bottom Width 5 ft Side Slope 3 :1 Top Width 11 ft Depth 1 ft Manning Equation Q = (1.49/n)*A*R2/3*S1/2 Q = 44.57 cfs (Ditch Maximum) Drainage Area Type Area (AC)C Grass 0.56 0.2 Impervious 0.44 0.9 Q =CIA C 0.51 I 7.52 in/hr (10 yr - 5 min Storm) A 1.00 ac Q 3.82 cfs (Max Required) Depth of Flow 0.2565 ft (@ required Flow) Q 3.827827 cfs A 1.479877 sf R 0.22347 Pw 6.622248 ft Top Width 6.539 ft Outlet Velocity (V)= Q/A V 2.586585 ft/s LINER IS REQUIRED Summey Engineering Associates, PLLC Project:Basic Machinery Job Number:E-5885 Channel Flow Equations Permanent Ditch 2 - Post Construction Hydraulic Radius R = A/Pw 0.70643 Area A =8 sf Wetted Perimeter Pw = 11.32456 ft Channel Slope S =0.02 ft/ft Mannings Coeff.n = 0.03 Trapazoidal Ditch Bottom Width 5 ft Side Slope 3 :1 Top Width 11 ft Depth 1 ft Manning Equation Q = (1.49/n)*A*R2/3*S1/2 Q = 44.57 cfs (Ditch Maximum) Drainage Area Type Area (AC)C Grass 0.25 0.2 Impervious 0.58 0.9 Q =CIA C 0.69 I 7.52 in/hr (10 yr - 5 min Storm) A 0.83 ac Q 4.30 cfs (Max Required) Depth of Flow 0.274 ft (@ required Flow) Q 4.290244 cfs A 1.595228 sf R 0.236929 Pw 6.732928 ft Top Width 6.644 ft Outlet Velocity (V)= Q/A V 2.689424 ft/s LINER IS REQUIRED