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ORDINANCE N0. 91-38 <br />2) More frequent occurrences of the same flow. For example, <br />a subdivision may have the peak flow of a predevelopment <br />five-year storm occur once a year after development is <br />complete. <br />3) Loss sediment in the runoff water because the watershed <br />is paved with non-erosive surfaces or good grass cover. <br />The two step standard requires that: <br />A) The peak rates of runoff from an area after development <br />shall be no greater than the peak rates of runoff from <br />the same area before development for all twenty-four-hour <br />storms from one to one hundred-year frequency. Designing <br />for the one-, two-, five-, ten-, twenty-five-, fifty-, <br />and one-hundred-year storms is considered adequate to <br />meet the requirement. Stormwater requirements must be <br />met at each point stormwater is discharged from a <br />development area. <br />B) If the volume of runoff from an area after development <br />will be greater than the volume of runoff from the same <br />area before development, it shall be compensated by <br />reducing the peak rate of runoff from the critical storm <br />and all more frequent storms occurring on the development <br />area to the peak rate of runoff from a one-year <br />frequency, twenty-four-hour storm occurring on the same <br />2