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w/o Freeboard w/ Freeboard <br />X-Section Area: 0.23 sq ft <br />Hydraulic Radius: 0.019 ft <br />Froude Number*: <br />Manning's n*: <br />Dmin: 2.00 in <br />D50: 6.00 in <br />Dmax: 7.50 in <br />Velocity and Manning's n calculations may not apply for this method. <br />Structure #3 (Null) <br /> Null at Confluence of D-1 & D-2 Ditch <br />Structure #2 (Pond) <br /> Section 26 Pond <br /> Pond Inputs: <br />Initial Pool Elev: 6,982.00 ft <br />Initial Pool: 1.62 ac-ft <br />*Sediment Storage: 0.00 ac-ft <br />Dead Space: 20.00 % <br />*No sediment capacity defined <br />Perforated Riser <br />Riser <br />Diameter <br />(in) <br />Riser Height <br />(ft) <br />Barrel <br />Diameter <br />(in) <br />Barrel <br />Length (ft) <br />Barrel Slope <br />(%)Manning's n Spillway Elev <br />(ft) <br />Number of <br />Holes per <br />Elev <br />18.00 14.00 18.00 200.00 4.00 0.0150 6,984.00 2 <br />Emergency Spillway <br />Spillway Elev Crest Length <br />(ft) <br />Left <br />Sideslope <br />Right <br />Sideslope <br />Bottom <br />Width (ft) <br />6,986.00 30.00 2.50:1 2.50:1 24.00 <br /> Pond Results: <br />Peak Elevation: 6,984.02 ft <br />H'graph Detention Time: 6.61 hrs <br />Pond Model: CSTRS <br />Dewater Time: 1.34 days <br />Trap Efficiency: 78.55 % <br />Dewatering time is calculated from peak stage to lowest spillway <br />Filename: Section 26 10-Year 24-Hour During Mining.sc4 Printed 03-14-2022 <br />SEDCAD 4 for Windows <br />Copyright 1998 -2010 Pamela J. Schwab <br />Civil Software Design, LLC 11