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HomeMy WebLinkAboutWPO201300022 Calculations 2013-03-27 (2) STORMWATER INLET CALCULATIONS FOR WHITTINGTON SUBDIVISION - PHASE A October 19, 2011 LOCATION: Tax Map 89, Parcel 95 Tax Map 90, Parcels 3, 45, 46, 47, 48 Samuel Miller, Albemarle County, Virginia OWNER/ DEVELOPER: Whittington, LLC 2421 Ivy Road Charlottesville, VA 22903 PREPARED BY: Dominion Engineering & Design 172 South Pantops Road Charlottesville, VA 22911 434.979.8121 (F) 434.979.1681 Curb and Gutter Analysis: ST-1 Parameters Longitudinal Slope of Ditch: 0.0500 (ft/ft) Cross-Slope of Ditch: 0.3333 (ft/ft) Mannings: 0.0200 Design Flow: 7.8900 (cfs) Inlet Location: Inlet in Sag Percent Clogging: 0.0000 % Inlet Type: DI-7 Grate Type: A I Grate Width: 3.0000(ft) Grate Length: 3.0000 (ft) Local Depression: 2.0000 (in) Perimeter: 9.0000 (ft) Effective Perimeter: 9.0000 (ft) Area: 5.4000 (ft^2) Effective Area: 5.4000(ft^2) Depth at center of grate: 0.4404(ft) Computed Width of Spread at Sag: 0.6610 (ft) Flow type: Weir Flow Efficiency: 1.0000 Curb and Gutter Analysis: ST-2A Parameters Longitudinal Slope of Ditch: 0.0500(ft/ft) Cross-Slope of Ditch: 0.3333 (ft/ft) Mannings: 0.0200 Design Flow: 2.7200 (cfs) Inlet Location: Inlet in Sag Percent Clogging: 0.0000 % Inlet Type: DI-7 Grate Type: A I Grate Width: 3.0000 (ft) Grate Length: 3.0000 (ft) Local Depression: 2.0000 (in) Perimeter: 9.0000 (ft) Effective Perimeter: 9.0000 (ft) Area: 5.4000 (ftA2) Effective Area: 5.4000 (ft^2) Depth at center of grate: 0.2165 (ft) Computed Width of Spread at Sag: 0.3253 (ft) Flow type: Weir Flow Efficiency: 1.0000 Curb and Gutter Analysis: ST-7 Parameters Longitudinal Slope of Ditch: 0.0500(ft/ft) Cross-Slope of Ditch: 0.3333 (ft/ft) Mannings: 0.0200 Design Flow: 13.6800 (cfs) Inlet Location: Inlet in Sag Percent Clogging: 0.0000 Inlet Type: DI-7 Grate Type: A I Grate Width: 3.0000 (ft) Grate Length: 3.0000 (ft) Local Depression: 2.0000 (in) Perimeter: 9.0000 (ft) Effective Perimeter: 9.0000 (ft) Area: 5.4000 (ft^2) Effective Area: 5.4000 (ft^2) Depth at center of grate: 0.6355 (ft) Computed Width of Spread at Sag: 0.9538 (ft) Flow type: Weir Flow Efficiency: 1.0000 Curb and Gutter Analysis: ST-8 Parameters Longitudinal Slope of Ditch: 0.0500 (ft/ft) Cross-Slope of Ditch: 0.3333 (ft/ft) Mannings: 0.0200 Design Flow: 4.4900 (cfs) Inlet Location: Inlet in Sag Percent Clogging: 0.0000 % Inlet Type: DI-7 Grate Type: A I Grate Width: 3.0000(ft) Grate Length: 3.0000 (ft) Local Depression: 2.0000 (in) Perimeter: 9.0000 (ft) Effective Perimeter: 9.0000 (ft) Area: 5.4000(ft^2) Effective Area: 5.4000 (ft^2) Depth at center of grate: 0.3024(ft) Computed Width of Spread at Sag: 0.4541 (ft) Flow type: Weir Flow Efficiency: 1.0000