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Percent Impervious N/A <br /> Hydrologic soil group N/A <br /> SCS CN for impervious surfaces N/A <br /> SCS CN for pervious surfaces N/A <br /> Hydrology not currently modeled <br /> Hydraulic calculations performed with SSA applying the hydrodynamic routing method <br /> Manning's roughness for existing and proposed drainage pipes: <br /> HDPE 0.012 <br /> Media storage <br /> South EMF inv in model 339.5 <br /> Porosity Depth, ft Top of Layer Ele Depth, ft Depth * pc Area, sf Volume increi Volume cumulative, source notes <br /> Drain rock 40% 3.5 343 3.5 1.4 31197 43676 43676 Thorne Rd depth varies; 3" min under each 8" pipe - use 12". <br /> Pea gravel 40% 0.5 343.5 4 0.2 31197 6239 49915 assumed <br /> Media 60% 2.5 346 6.5 1.5 31197 46796 96711 Thorne Rd <br /> 6.5 <br /> North EMF inv in model 341.9 <br /> Porosity Depth, ft Top of Layer BE Depth, ft Depth * pc Area, sf Volume increi Volume cumulative, source notes <br /> Drain rock 40% 1.1 343 1.1 0.44 26542 11678 11678 Thorne Rd depth varies; 3" min under each 8" pipe - use 12". <br /> Pea gravel 40% 0.5 343.5 1.6 0.2 26542 5308 16987 assumed <br /> Media 60% 2.5 346 4.1 1.5 26542 39813 56800 Thorne Rd <br /> 4.1 <br />