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<br />Page 21 <br /> <br />in the following chart. This chart applies to both building permits <br />and subdivision of land. <br /> <br />Type of <br />Development <br /> <br />Zoning Classification <br /> <br />Area <br /> <br />New and Infill <br /> <br />CN <br /> <br />Exempt <br /> <br />New and Infill <br /> <br />lR, 2R, 3R and single family <br />and duplex portions of MD. <br /> <br />2 acres <br /> <br />New and Infill <br /> <br />4R, SR, 6R, OF, l-C, 2-C, 3-C, <br />4-C, S-C, IN, and multi-family <br />thru industrial portions of MU <br /> <br />1 acre <br /> <br />"Any person meeting the application prov1s10ns of this ordinance . <br />shall control the release rate of storm water runoff so that runoff after <br />development shall not exceed the runoff from the same parcel of land in <br />its natural state for the Sand 100-year storm respectively." <br /> <br />Large detention ponds or existing ponds which are utilized for detention <br />may be classified as reservoirs. These ponds must conform to "Manual of <br />Rules and Regulations for Plans and Specifications of Reservoirs." State <br />of Colorado. <br /> <br />1) Volume and Release Criteria: Provision for detention of storm water <br />is intended to reduce the impact of development upon the peak dis- <br />charge of the major drainage basin. Controlling the rate of dis- <br />charge of storm water runoff at calculated historic levels for a <br />number of small sites often will not reduce the discharge to his- <br />toric levels for the entire watershed. In order to control the com- <br />bined discharge at more nearly historic levels, detention facilities <br />are to be provided which meet the following criteria: <br /> <br />S year Storm <br />V S = (36 C i) A <br /> <br />QS = .2 A <br />