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i <br /> 3 .4 Minimum Pip Size <br /> Catch basin laterals shall be not less than 10 inches in diameter. <br /> All mains or trunk lines shall be not less than 12 inches in <br /> diameter. <br /> 3 .5 Backwater <br /> All outlets shall take into account any backwater condition or <br /> tidal effect in the receiving channel. <br /> TABLE 3-2 <br /> ALLOWABLE VELOCITIES FOR UNLINED OPEN CHANNELS <br /> Channel Material Max. Allowable Velocity <br /> fps <br /> Fine sand 2 .0 <br /> Sandy loam 2 .5 <br /> Alluvial silt 3 .0 <br /> Firm loam 3.5 <br /> Fine gravel 4.0 <br /> 4.5 <br /> Stiff clay <br /> Coarse gravel 5 .0 <br /> Adapted from Table XXI, ASCE Manual No. 37, 1970 <br /> L. <br /> 3-3 <br />