Williamston Subdivision - Complete Set_Williamston_111817

Kevin E. HerringENGINEERINGVICINITY MAP (Not to Scale)Williamston Subdivision is a proposed 9 lot residential development locatedoff SR 1627 (New Salem Road) approximately 600 feet south of SR 2717 (PolkMountain Road). The site is in the Yadkin River Basin and drains to BrandonBranch. The site is in Union County Zoning District.The development is proposed as "low density" with a maximum built upon areaof 24%. The street cross-sections are shoulder and ditch. This combined withnatural swales leaving the site shall provide the required conveyances.The maximum built upon area per lot shall not exceed 9,000 sf for all 9 lots.LabelUp NodeDown NodeUpstream Inlet Area (acres)Up Inlet Rational CoeffSystem Intensity (in/hr)Total System Flow (cfs)(ft)Const Slope (ft/ft)Section SizenMaterialFull Capacity (cfs)Up Invert Elevation (ft)Dn InvertElevation(ft)P-1DI-1DI-25.800.504.6513.59520.009624 inch0.013RCP22.18532.00531.50P-2DI-2JB-30.320.504.6414.31460.010924 inch0.013STEEL23.58531.50531.00Length Mannings P-3JB-3FESN/AN/A4.6314.28960.008324 inch0.013RCP20.65531.00530.20UP RimElevation(ft)537.00537.00537.50
Kevin E. HerringENGINEERING