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Home My WebLink About20171169 Ver 1_SW Plan_20170912(Version 2.04; Released November 2015)17BP.13.R.26TIP No.: County(ies):Buncombe Page 1 of 2TIP Number:Date:Phone:Phone:Email:Email:County(ies):CAMA County?NoDesign/Future: Year:2008Existing: Year:Aquatic T&E Species?NoComments:No N/AN/ARaleigh, NC 27699-15901590 Mail Service CenterNCDOT Hydraulics UnitBill Zerman, PE(919) 707-6755bzerman@ncdot.gov(919) 859-2243Project Includes Bridge Spanning Water Body? Deck Drains Discharge Over Buffer? Dissipator Pads Provided in Buffer?N/ADeck Drains Discharge Over Water Body?(If yes, provide justification in the General Project Narrative) (If yes, describe in the General Project Narrative; if no, justify in the General Project Narrative)NRTR Stream ID:Annual Avg Daily Traffic (veh/hr/day):Existing SiteProject Length (lin. miles or feet): ac.Surface Water Body (1): Class CNCDWR Surface Water Classification for Water Body14002-10' paved lanesWaterbody Information2008NCDWR Stream Index No.:17BP.13.R.26Impairments:Other Stream Classification: Primary Classification: Project Built-Upon Area (ac.)ac.North Carolina Department of TransportationHighway Stormwater Program STORMWATER MANAGEMENT PLAN FOR NCDOT PROJECTSProject Type:Address:General Project InformationWBS Element:Bridge ReplacementNCDOT Contact:Contractor / Designer:Address:bsmith@sungatedesign.comSungate Design Group, P.A.Raleigh, NC 27606915 Jones Franklin Road12/11/2015BuncombeCandler, NCRiver Basin(s): City/Town:0.2Typical Cross Section Description: WBS Element:General Project Narrative:(Description of Minimization of Water Quality Impacts)NoHominy Creek Tributary 25N/A0.12-8' paved lanes1400Project DescriptionProposed ProjectFrench BroadNoneSupplemental Classification: Surrounding Land Use: NoneN/ABuffer Rules in Effect:N/ANone(If yes, provide justification in the General Project Narrative)Wetlands within Project Limits?0.062 MilesRural ResidentialThis project involves the replacement of Bridge No. 100332 over Hominy Creek Tributary 25 on SR 1140 (Morgan Branch Rd) in Buncombe County, NC with a 2@103"x71" aluminized CSPA. This bridge replacement and the associated roadway improvements have been designed in a manner that minimizes the increase in impervious surface area. One of the the two culvert barrels will have a sill that is 1.0' higher than the other barrel, causing the stream to flow through only one barrel under normal flow conditions. A lateral ditch in the northwest quadrant of the proposed culvert will convey off-site stormwater and runoff from the road surface to an open-ended drive pipe that will discharge into the creek downstream of the proposed culvert. A lateral ditch in the southeast quadrant of the proposed culvert will collect runoff from the road surface and off-site sources that will discharge downstream of the proposed culvert via a cross pipe. (Version 2.04; Released November 2015)17BP.13.R.26TIP No.: County(ies):Buncombe Page 2 of 2Sheet No.:4Station:13+15 -L-Sq. MilesBarrel Height (ft):Culvert Length (ft)%%Evaluate/Describe Roadway Geometric Constraints:N/AProposed Culvert 2-yr Outlet Velocity (ft/s):6.3Natural Stream Channel 10-yr Velocity (ft/s):6.1Proposed Culvert 10-yr Outlet Velocity (ft/s):7.6Roadway Geometric ConsiderationsBank Stabilization:Class I rip rap has been specified for the banks upstream and downstream of the proposed culvert to provide bank stabilization. Natural Stream Channel 2-yr Velocity (ft/s):5.1Outlet VelocitiesSharp Bends at Inlet/Outlet?(describe culvert alignment with stream)No The culvert aligns with the existing channel.Stream Realignment Necessary? (provide justification)No N/ACulvert/Stream AlignmentStream Patterns Upstream and Downstream of the Culvert that Could Affect Fish Passage and Bank Stability:The existing stream displays slight sinuosity over a relatively straight alignment with several small steps consistent with streams in the region. Downstream of the proposed culvert, the stream runs through residential yards which typically inhibits the development of thick vegetative cover, thereby reducing bank stability.Bed Forms Impacted by Culvert (riffles, pools, glides, etc.):The upstream end of the proposed culvert is located where a pool currently exists, followed by a glide and a riffle.Low Flow Floodplain Bench Required? (provide justification)Yes A floodplain bench is necessary to provide the low-flow channel geometry necessary to approximate the existing stream as well as adequately pass high flow events without increasing water surface elevations upstream of the culvert.8.6' wide0.5' deepProposed Sills/Baffles:The culvert will have 1.0' sills at the inlet and outlet of the low flow barrel, and 1.5' sills at the inlet and outlet of the high flow barrel.Existing Low Flow Velocities in the Stream (ft/s):0.7Proposed Low Flow Velocities Through the Culvert (ft/s):1.4Alternating Low Flow Sills/Baffles:Culvert BurialProposed Culvert Burial Depth (ft):1Existing Streambed Material:Sand, gravel, cobbles, boulders, and bedrockProposed Low Flow Dimensions Through the Culvert:Avoidance and Minimization Efforts:(Bridge to Culvert)The proposed culvert will be buried 1.0' with sills throughout the low flow channel to retain bed material. A floodplain bench and 1.5' sills in the high flow barrel of the culvert promote low flow in one barrel only, maintaining the existing low flow channel dimensions and velocities as closely as possible. The culvert approximates the existing bed slope and provides a smooth transition from upstream to downstream.Stream SlopeFish and/or Aquatic Life PassageExisting Average Stream Slope (%):0.10Existing Low Flow Channel Dimensions in the Stream:8.9' wide0.4' deepProposed Culvert Slope (%):0.30Surface Water Body:Hominy Creek Tributary 2562'-2"Culvert Type:Aluminized CSPA5'-11"Proposed Structure SummarySheet No. & StationDrainage Area (ac or sq mi):0.84Number of Barrels:2Barrel Width/Diameter (ft):8'-7"North Carolina Department of TransportationHighway Stormwater ProgramSTORMWATER MANAGEMENT PLANFOR NCDOT PROJECTSWBS Element:Bridge to Culvert Avoidance and Minimization DAVID GARRETT EDWARD S. ROBBINS, PE DHV D T V = == = = = % % ADT % * DO NOT USE FOR CONSTRUCTION PRELIMINARY PLANS 0 0 0 PROFILE (HORIZONTAL) R/W, UTIL PROJECT LENGTH RIGHT OF WAY DATE: LETTING DATE: STATE STATE PROJECT REFERENCE NO. STATE PROJ. NO.F. A. PROJ. NO.DESCRIPTION NO. TOTAL SHEETS N.C. SHEET 1 DESIGN DATA SIGNATURE: SIGNATURE: P.E. P.E. 2012 STANDARD SPECIFICATIONS PROJECT ENGINEER PROJECT DESIGN ENGINEER GRAPHIC SCALES PLANS PROFILE (VERTICAL) HYDRAULICS ENGINEER ENGINEER ROADWAY DESIGN LOCATION: 09/08/99DIVISION OF HIGHWAYS STATE OF NORTH CAROLINA 10/21/2013100332_Hyd_prm_wet_tshbsmithARTMEN N ASO H DEPT O F TRA SPORTTIONTATEOFNRTCAR O LI NA= VICINITY MAP 0.062 MILES NCDOT CONTACT:BRENDA L. MOORE, PE COORDINATION SECTION ENGINEER ROADWAY DESIGN: ENGINEERING RALEIGH, NORTH CAROLINA of Transportation in the office of: Prepared for the North Carolina Department Fax: 919-851-2103 Bus: 919-854-1345 License No,: F-0246 Raleigh NC 27606 Suite 217 5540 Centerview Drive BUNCOMBE COUNTY TYPE OF WORK: 20 2010 370 MPH** FOR VERTICAL K & SE ** DESIGN EXCEPTION REQUIRED SITE PROJECT 1 1 4 0 PE 17BP.13.R.26 LENGTH OF ROADWAY PROJECT 17BP.13.R.26 6 * (TTST =3%+ DUAL 3%) FUNC CLASS = 1130 1141 11441141 1205 40 11011150 1140 1139We b b Br a n c h Hominy Creek Mo rganBranchC reek LOCAL GRADING, DRAINAGE, AND PAVING -L- STA 14+50.00 -L- STA 11+00.00 BEGIN PROJECT 17BP.13.R.26 END PROJECT 17BP.13.R.26PROJECT: 17BP.13.R.26WETLAND AND SURFACE WATER IMPACTS PERMIT SHEET 1 OF 6 PERMIT DRAWING DETOUR ROUTE AREL DR.TO JAMES TRIB 25 HOMINY CREEK (MORGAN BRANCH RD.) -L- SR 1140 TO NC 151 ON SR 1140 BRIDGE NO. 100332 HOMINY CREEK TRIBUTARY 25 20 40 20 40 4 824 1020 1020 Southern R ailw ay40 40 Luther Ch. Hill Pleasant NAD 83/ 86 HandExisting Existing Permanent Temp. Excavation Mechanized Clearing Permanent Temp. Channel Channel Natural Site Station Structure Fill In Fill In in Clearing in SW SW Impacts Impacts StreamNo. (From/To) Size / Type Wetlands Wetlands Wetlands in Wetlands Wetlands impacts impacts Permanent Temp. Design (ac) (ac) (ac) (ac) (ac) (ac) (ac) (ft) (ft) (ft) 11+97 TO 14+05 -L- STREAMBANK STABILIZATION < 0.01 48 CULVERT 0.01 58 STREAMBANK STABILIZATION < 0.01 79 TEMPORARY DEWATERING 0.03 209 TOTALS*: 0.03 0.03 185 209 0*Rounded totals are sum of actual impactsNOTES:ATN Revised 3/12/13SHEET 6OF 6 WETLAND PERMIT IMPACT SUMMARYWETLAND IMPACTS SURFACE WATER IMPACTSBUNCOMBE COUNTYBRIDGE 332 ON SR 1140OVER HOMINY CREEK TRIB 25 NC DEPARTMENT OF TRANSPORTATIONDIVISION OF HIGHWAYS2/24/2016