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Project: North County Sanitary Landfill - Non -Water Release Corrective Action Plan <br />Client: County of San Joaquin <br />Job No.: 2013.A135 <br />Calc'd By: NC <br />Date: 2/20/2014 <br />1000 -YEAR DRAINAGE CALCULATIONS (WEST PERIMETER DITCH) <br />[A] <br />[C] <br />[A x C] <br />[Lo] [s] [n] <br />[Lc] [s] [n] [Rh] [V] <br />[Ti] [Tp] [Tc] <br />[i] <br />[Qa] [Qt] <br />Gutter / Channel / Conduit <br />Travel Time <br />Length <br />Slope <br />Mannings <br />Hydraulic <br />Radius <br />Velocity <br />Overland <br />Gut / Chan / <br />Cond <br />Total <br />Drainage <br />Runoff <br />Overland <br />Rainfall <br />Intensity <br />Discharge <br />Drainage <br />Area <br />Length <br />Slope <br />Mannings <br />Subarea Total <br />I.D. <br />(acre) <br />Coefficient <br />A x C <br />(feet) <br />(ft/ft) <br />n <br />(feet) <br />(ft/ft) <br />n <br />(feet) <br />(ft/s) <br />(min) <br />(min) <br />(min) <br />(in/hour) <br />(cfs) (cfs) <br />Facilities <br />Downdrain DD6 <br />F1 <br />3.9 <br />0.6 <br />2.34 <br />150 <br />0.33 <br />0.084 <br />500 <br />0.02 <br />0.03 <br />0.380 <br />3.67 <br />3.0 <br />2.3 <br />5.3 <br />5.49 <br />12.8 6.4 <br />Bench w/ditch <br />0.0 <br />5.3 <br />5.49 <br />12.8 <br />18" CMP Downdrain <br />F2 <br />7.9 <br />0.6 <br />4.74 <br />150 <br />0.10 <br />0.084 <br />500 <br />0.02 <br />0.03 <br />0.480 <br />4.29 <br />4.5 <br />1.9 <br />6.4 <br />4.95 <br />23.5 11.7 <br />Bench w/ditch <br />0.1 <br />5.4 <br />5.44 <br />38.5 <br />24" CMP Downdrain <br />F3 <br />7.5 <br />0.6 <br />4.50 <br />150 <br />0.10 <br />0.084 <br />500 <br />0.02 <br />0.03 <br />0.480 <br />4.29 <br />4.5 <br />1.9 <br />6.4 <br />4.95 <br />22.3 11.1 <br />Bench w/ditch <br />0.1 <br />5.5 <br />5.38 <br />62.4 <br />30" CMP Downdrain <br />F4 <br />2.3 <br />0.6 <br />1.38 <br />0 <br />0.33 <br />0.084 <br />1000 <br />0.02 <br />0.03 <br />0.450 <br />4.11 <br />0.0 <br />4.1 <br />4.1 <br />6.30 <br />8.7 <br />Bench w/ditch <br />0.0 <br />5.5 <br />5.38 <br />69.8 <br />Combined flow <br />0.0 <br />9.4 <br />4.05 <br />1 171.7 <br />1 Combined flow <br />Notes: <br />1) Overland travel time from the Federal Highway Administration HEC -22 Urban Design Manual. Ti=(0.933/i^0.4)/(nLo/sgrt(s))^0.6 <br />2) The total discharge is calculated from the rational method. Q=CiA <br />3) Drainage I.D.; drainage area; runoff coefficient; overland, gutter, channel, and conduit length and slope from Preliminary Closure and PostClosure Maintenance Plan prepared by Shaw Environmental, Inc., January 2010. <br />Page 6 of 7 <br />