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<br />Table 1 <br />Mining Area Ditches <br />Item Ditches <br />(1) {2) (3) {4) (5) (b) (7) <br /> <br />Ditch No. 1 2 3 4 5 6 <br />Designation Diversion No. Diversion No. Streeter Gulch A Gulch A East Side <br /> 1 to Prospect 2 to Prospect Gulch N . Ditch 5. Ditch Collection <br /> Gulch Gulch Ditch <br />Maximum Drainage Area (acres) 517 322 1424 30 638 100 <br />Design Category Temporary Permanent Permanent Permanent Permanent Temporary <br />Design Precipitation Frequency (years) 10 10 100 10 10 10 <br />Runoff Coefficient CN67 CN67 CN67 CN67 CN67 CN67 <br />Rainfall Intensity (in/hr) 1.8 1.8 2,8 1.8 1.8 1.8 <br />Design Flow (cfs) 5.3 4.0 22.0 0.4 7.4 1.0 <br />Average Slope (%) 1.0 5..1 7.3 24 11.6 1.0 <br />Roughness Factor, M anning's n 0.03 0.03 0.04 0.04 0.04 0.03 <br />Design Depth (feet) 0.5 0.2 0.5 0.1 0.4 0.2 <br />Design Width (feet) 3.0 5.0 6.0 2.0 3.0 5.0 <br />Velocity (ft/sec) 2.5 3.7 6.0 2.8 5.7 1.3 <br />Rock Protection Required No No Yes Yes Yes No <br />• <br /> <br /> <br />