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<br />. <br /> <br />. <br /> <br />. <br /> <br />e <br /> <br />e <br /> <br />e <br /> <br />2. <br /> <br />(c) Sizing of Sewers: Sewers shall be sized to carry the <br />discharge (Q) derived from the above formula. <br />Capacity of storm sewers will be determined by the use <br />of Mannings formula on the basis of hydraulic gradients <br />rather than the physical slope of the pipe. Minimum size <br />of storm sewer shall be 15 inches. <br />(d) Sizing and Spacing of Inlets: Inlets shall be spaces <br />so that maximum travel distance of water in gutter will <br />not exceed 600 feet. Inlets will be provided at all low <br />points in gutter gradient. Inlets will be sized using an <br />allowable capacity of one (1) cubic foot per second per <br />foot of opening for a throat height of five (5) inches. <br />(e) Ditches: Ditches shall be sized to carry the runoff (Q) <br />deri ved from the above formula. <br />Design: Design off::storm sewers, outfalls, culverts, and <br />drainage ditches will conform to the following general re- <br />quirements: <br />(a) Manholes: Manholes (inlets or junction boxes) shall be <br />provided at all changes in grade or alignment, sewer <br />intersections, street intersections, and at a maximum <br />of 1,000 feet on straight lines. If monolithic, reinforced c <br />concrete sewer lines are used, a manhole is not re- <br />quired where leads from inlets intersect the main <br />_ sewer. Design of manholes shall follow acceptable <br />engineering practice, and shall be constructed of brick <br />or reinforced concrete. <br />(b) ,Inlets: Design of inlets shall follow acceptable engineer- <br />ing practice, and walls shall be constructed of rein - <br />forced concrete or brick. <br /> <br />27 <br />