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<br />(c) Pipe: Pipe for storm drains shall be concrete pipe <br />in sizes as shown on the approved plans. Pipe <br />twenty-one (21) inches or larger in diameter shall be <br />reinforced concrete pipe (RCP), ASTM C76, Class 3, <br />Pipe eighteen (18) inches or smaller in diameter shall <br />be plain concrete pipe (PC)l\STM C14, standard strength. <br />Where, in the opinion of the City Engineer, added <br />strength of pipe is needed for traffic loads over mini- <br />mum cover or for excessive height of backfill, concrete <br />pipe shall be ASTM C14 Extra Strength or ASTM C76, <br />Class IV or V. Pipe shall have a minimum cover of not <br />less than one (1) foot over the top of pipe. Monolithic, <br />reinforced concrete sewers may be used for storm <br />Sewers thirty-six (36) inches and larger. <br />(d) Ditches: Drainage ditches, where approved by the <br />Planning Commission, may be used for outfaUs to <br />natural or major drainage channels. Ditches shall have <br />a minimum grade of not less than 0.10 per cent and side <br />slopes not steeper than 3:1. <br />(e) Outfalls: Outfalls from sewers and ditches into <br />natural drainage ways shall enter at the grade of the <br />natural drainage channel. If necessary, drop type out- <br />fall structures shall be used to prevent erosion. <br />(f) Major Drainage Ways and Structures: Design of major <br />drainage ways through a subdivision and major structures <br />such as box culverts or bridges, across a major drainage <br />channel, shall be coordinated with Harris County Fa:6b.a <br />Control District. <br /> <br />e <br /> <br />,It <br /> <br />. <br /> <br />'. <br /> <br />. <br /> <br />e <br /> <br />28 <br />