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SEDCAD 4.0 <br />I4.n,.innr roac o°~.vi~ i c~n,.nn <br />Section A-A -Figure 3.1-4 <br />Material: Stiff clay very colloidal <br />T~iangu/a~ Channel <br />Left Right ~ Freeboard Freeboard Freeboard Umiting <br />Sideslope Sideslope Slope (%) Manning's n Mult. x Velocity <br />Ratio Ratio Depth (ft) % of Depth ~D) (fps) <br />1.5:1 10.0:1 2.0 0.0250 0.30 5.0 <br /> w/o Freeboard w/ Freeboard <br />Design Discharge: 1.30 cfs <br />Depth: 0.31 ft 0.61 R <br />Top Width: 3.53 ft 6.98 R <br />Velocity: 2.39 fps <br />X-Section Area: 0.54 sq ft <br />Hydraulic Radius: 0.151 <br />Froude Number: 1.08 <br />I <br />The 10-year peak flow for the water bar and mine bench perimeter berm is the flow seen by the <br />rock check dam and silt fence (ref. page M(viii)-1). <br />The above Sedcad calculations show a V-ditch 0.6-feet deep will pass the design flow. The <br />side slopes of the perimeter berm and water bar are variable. A 1.5H:1 V slope was utilized for <br />one side slope and a 10H:1 V side slope was used for the other slope to approximate the water <br />bar and perimeter berm configuration. <br />ENGINEER'S CERTIFICATION <br />LJ <br />The calculations and information <br />month of February, 2004, and the <br />knowledge and belief. <br />Registered Professior~ <br />State of Colorado No. <br />~~'O~U~i <br />A~L~ ~ e" <br />prepared by me during the <br />!,sand correct to the best of my <br />SEDCAD Utility Run <br />M~ <br />M(viii)-t x <br />Printed 02-24-2004 <br />02/04 <br />