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�J <br />�J <br />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 (SOUTHERN 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 DD3 <br />C1 <br />2.6 <br />0.6 <br />1.56 <br />150 <br />0.33 <br />0.084 <br />500 <br />0.02 <br />0.03 <br />0.330 <br />3.34 <br />3.0 <br />2.5 <br />5.5 <br />5.36 <br />8.4 4.2 <br />Bench w/ditch <br />0.0 <br />5.5 <br />5.36 <br />8.4 <br />18" CMP Downdrain <br />C2 <br />3.4 <br />0.6 <br />2.04 <br />150 <br />0.33 <br />0.084 <br />500 <br />0.02 <br />0.03 <br />0.370 <br />3.61 <br />3.0 <br />2.3 <br />5.3 <br />5.47 <br />11.2 5.6 <br />Bench w/ditch <br />0.1 <br />5.6 <br />5.31 <br />19.1 <br />24" CMP Downdrain <br />C3 <br />4.0 <br />0.6 <br />2.40 <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 />13.2 6.6 <br />Bench w/ditch <br />0.1 <br />5.7 <br />5.26 <br />31.6 <br />24" CMP Downdrain <br />C4 <br />3.7 <br />0.6 <br />2.22 <br />120 <br />0.33 <br />0.084 <br />500 <br />0.005 <br />0.03 <br />0.350 <br />1.74 <br />2.8 <br />4.8 <br />7.6 <br />4.52 <br />10.0 5.0 <br />Perimeter bench w/ditch <br />0.1 <br />5.8 <br />5.21 <br />42.8 <br />30" CMP Downdrain <br />B6 <br />4.1 <br />0.6 <br />2.46 <br />0 <br />0.33 <br />0.084 <br />1400 <br />0.03 <br />0.03 <br />0.630 <br />6.30 <br />0.0 <br />3.7 <br />3.7 <br />6.61 <br />16.3 <br />Perimeter sub -area flow <br />0.0 <br />5.8 <br />5.21 <br />55.7 <br />Combined flow <br />Downdrain DD3 <br />C1 <br />2.6 <br />0.6 <br />1.56 <br />150 <br />0.33 <br />0.084 <br />500 <br />0.02 <br />0.03 <br />0.330 <br />3.34 <br />3.0 <br />2.5 <br />5.5 <br />5.36 <br />8.4 4.2 <br />Bench w/ditch <br />0.0 <br />5.5 <br />5.36 <br />8.4 <br />18" CMP Downdrain <br />C2 <br />3.4 <br />0.6 <br />2.04 <br />150 <br />0.33 <br />0.084 <br />500 <br />0.02 <br />0.03 <br />0.370 <br />3.61 <br />3.0 <br />2.3 <br />5.3 <br />5.47 <br />11.2 5.6 <br />Bench w/ditch <br />0.1 <br />5.6 <br />5.31 <br />19.1 <br />24" CMP Downdrain <br />C3 <br />4.0 <br />0.6 <br />2.40 <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 />13.2 6.6 <br />Bench w/ditch <br />0.1 <br />5.7 <br />5.26 <br />31.6 <br />24" CMP Downdrain <br />C4 <br />3.7 <br />0.6 <br />2.22 <br />120 <br />0.33 <br />0.084 <br />500 <br />0.005 <br />0.03 <br />0.350 <br />1.74 <br />2.8 <br />4.8 <br />7.6 <br />4.52 <br />10.0 5.0 <br />Perimeter bench w/ditch <br />0.1 <br />5.8 <br />5.21 <br />42.8 <br />30" CMP Downdrain <br />C5 <br />2.2 <br />0.6 <br />1.32 <br />120 <br />0.33 <br />0.084 <br />500 <br />0.006 <br />0.03 <br />0.380 <br />2.01 <br />2.8 <br />4.1 <br />6.9 <br />4.76 <br />6.3 <br />Perimeter sub -area flow <br />0.0 <br />5.8 <br />5.21 <br />49.7 <br />Combined flow <br />C6 <br />2.6 <br />0.6 <br />1.56 <br />0 <br />0.33 <br />0.084 <br />1000 <br />0.006 <br />0.03 <br />0.400 <br />2.08 <br />0.0 <br />8.0 <br />8.0 <br />4.41 <br />6.9 <br />Perimeter sub -area flow <br />0.0 <br />5.8 <br />5.21 <br />57.8 <br />Combined flow <br />0.0 <br />5.8 <br />5.21 <br />113.5 <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))^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 7 of 7 <br />