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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 />Drainage <br />Runoff <br />Overland <br />Length <br />Slope <br />Mannings <br />Hydraulic <br />Radius <br />Velocity <br />Overland(') <br />Gut/ Chan / <br />Cond <br />Total <br />Rainfall <br />Intensity <br />Discharge (2) <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 DD2 <br />61 <br />5.5 <br />0.6 <br />3.30 <br />150 <br />0.03 <br />0.084 <br />500 <br />0.02 <br />0.03 <br />0.420 <br />3.93 <br />6.9 <br />2.1 <br />9.0 <br />4.14 <br />13.7 6.8 <br />Diversion berm w/ditch <br />0.0 <br />9.0 <br />4.14 <br />13.7 <br />18" CMP Downdrain <br />B2 <br />2.7 <br />0.6 <br />1.62 <br />100 <br />0.33 <br />0.084 <br />500 <br />0.02 <br />0.03 <br />0.340 <br />3.41 <br />2.3 <br />2.4 <br />4.8 <br />5.80 <br />9.4 4.7 <br />Bench w/ditch <br />0.1 <br />9.1 <br />4.12 <br />20.3 <br />24" CMP Downdrain <br />B3 <br />3.1 <br />0.6 <br />1.86 <br />150 <br />0.33 <br />0.084 <br />500 <br />0.02 <br />0.03 <br />0.350 <br />3.48 <br />3.0 <br />2.4 <br />5.4 <br />5.41 <br />10.1 5.0 <br />Bench w/ditch <br />0.1 <br />9.2 <br />4.09 <br />27.8 <br />24" CMP Downdrain <br />B4 <br />3.6 <br />0.6 <br />2.16 <br />150 <br />0.33 <br />0.084 <br />500 <br />0.02 <br />0.03 <br />0.350 <br />3.48 <br />3.0 <br />2.4 <br />5.4 <br />5.41 <br />11.7 5.8 <br />Bench w/ditch <br />0.1 <br />9.3 <br />4.07 <br />36.4 <br />30" CMP Downdrain <br />B5 <br />3.3 <br />0.6 <br />1.98 <br />120 <br />0.33 <br />0.084 <br />500 <br />0.005 <br />0.03 <br />0.330 <br />1.67 <br />2.9 <br />5.0 <br />7.8 <br />4.46 <br />8.8 4.4 <br />Perimeter bench w/ditch <br />0.1 <br />9.4 <br />4.05 <br />44.2 <br />30" CMP Downdrain <br />A6 <br />2.4 <br />0.6 <br />1.44 <br />0 <br />0.33 <br />0.084 <br />1000 <br />0.002 <br />0.03 <br />0.310 <br />1.01 <br />0.0 <br />16.4 <br />16.4 <br />3.03 <br />4.4 <br />Perimeter sub -area flow <br />0.0 <br />9.4 <br />4.05 <br />50.0 <br />Combined flow <br />Downdrain DDl <br />Al <br />11.9 <br />0.6 <br />7.14 <br />150 <br />0.03 <br />0.084 <br />500 <br />0.02 <br />0.03 <br />0.560 <br />4.76 <br />6.8 <br />10.0 <br />1.8 <br />8.6 <br />4.25 <br />30.4 15.2 <br />Diversion berm w/ditch <br />8.6 <br />4.25 <br />30.4 <br />24" CMP Downdrain <br />A2 <br />5.1 <br />0.6 <br />3.06 <br />100 <br />0.33 <br />0.084 <br />500 <br />0.02 <br />0.03 <br />0.440 <br />4.05 <br />2.3 <br />2.1 <br />4.3 <br />6.10 <br />18.7 9.3 <br />Bench w/ditch <br />0.1 <br />8.7 <br />4.23 <br />43.1 <br />30" CMP Downdrain <br />A3 <br />4.1 <br />0.6 <br />2.46 <br />150 <br />0.33 <br />0.084 <br />500 <br />0.02 <br />0.03 <br />0.390 <br />3.74 <br />3.0 <br />2.2 <br />5.2 <br />5.52 <br />13.6 6.8 <br />Bench w/ditch <br />0.1 <br />8.8 <br />4.20 <br />53.2 <br />30" CMP Downdrain <br />A4 <br />4.1 <br />0.6 <br />2.46 <br />150 <br />0.33 <br />0.084 <br />500 <br />0.02 <br />0.03 <br />0.390 <br />3.74 <br />3.0 <br />2.2 <br />5.2 <br />5.52 <br />13.6 6.8 <br />Bench w/ditch <br />0.1 <br />8.9 <br />4.18 <br />63.1 <br />36" CMP Downdrain <br />A5 <br />3.3 <br />0.6 <br />1.98 <br />120 <br />0.33 <br />0.084 <br />500 <br />0.005 <br />0.03 <br />0.330 <br />1.67 <br />2.9 <br />5.0 <br />7.8 <br />4.46 <br />8.8 4.4 <br />Perimeter bench w/ditch <br />0.1 <br />9.0 <br />4.15 <br />71.0 <br />36" CMP Downdrain <br />0.0 <br />1 9.4 <br />1 4.05 <br />119.3 <br />Combined flow <br />Notes: <br />1) Overland travel time from the Federal Highway Administration HEC -22 Urban Design Manual. Ti=(0.933/iA0.4)/(nLo/sgrt(s))A0.6 <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 5 of 7 <br />