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<br />inlet time on the basis of experience under similar conditions. Inlet time <br />decreases as the slope and tlle imperviousness of the smface increases, and it <br />increases as the distanee over which the water has to travel and retention by the <br />contact surfaces. <br /> <br />Time of concentration shall be computed from Figure 2 and in no case shaH the <br />inlet time be more that the time shown in Table 1. <br /> <br />Table 1 <br /> <br />Zone Zoning District Name Runoff Ma.ximum Inlet <br /> Coefficient "c" Time in Minutes <br />R-I Low Density Residential 0.50 15 <br />R-2 Mid Density Residential 0.60 15 <br />R-3 High Density Residential 0.80 10 <br />MH Manufactured Housing District 0.55 15 <br />NC Neighborhood Commercial District 0.80 --- 10 <br />GC General Commercial District 0.85 10 <br />Bl Business Industrial Park District 0.85 ]() <br /> -- <br />LI Light Industrial 0.85 10 <br />HI Heavv Industrial 0.85 10 <br />PUD Planned Unit Development District variable 10 to 15 <br /> <br />MisceUaneous Land Uses <br /> <br />Land Use <br /> <br />Runoff Coefficient "C" <br /> <br />Church <br />School <br />Park <br /> <br />0.70 to 0.90 <br />0.50 to 0.90 <br />0.30 to 0.70 <br /> <br />C. Dahilll <br /> <br />All drdinage plans shall be prepared based on North American Vertical DahUn of 19&8, <br />200 I adjustment, consistent with National Flood Insurance Program, Flood Insurance <br />Study for the City of La Porte. <br /> <br />5.5 REQUIRED DETENTION <br /> <br />Detention Basins - Unless otherwise provided for in this Section, Detention Basins will be <br />required for developments within the following watersheds. <br /> <br />Little Deer Creek - F2I2 <br />. Upstream of Main Street <br /> <br />Little Cedar Bayou - F216 <br />. Upstream of State Highway 146 <br /> <br />Big Island Slough - B 106 <br />. All segments <br /> <br />Spring Gully - B I 09 <br />. All segments <br /> <br />Willow Spring Bayou - B I 12 <br /> <br />Stonnwatcr Criteria Page 4 of 10 <br />