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<br />unless an incremental damage analysis demonstrates a lesser Inflow <br />design flpod Is applicable. ' <br /> <br />S.A.(S)(b)(III) Hew Large Class II dams and enlarge..nts <br />shall have spillways capable of passing, as a minimum, the Inflow <br />design flood generated by 7S percent of the Probable Maximum <br />Precipitation, . unless an IncreMntal damage analysis dellOnstrates a <br />lesser Inflow design flood Is applicable. <br /> <br />, <br />S.A.(S)(b)(IV) New Intermediate and Small Class II dams and <br />enlargements shall have spillways capable of passing, as a minimum, <br />the Inflow design flood generated by SO percent of the Probable <br />Maximum Precipitation, unless an Incremental damage analysis demon- <br />strates a lesser inflow design flood is applicable. <br /> <br />S.A.(S)(b)(V) New Minor, Class II and Large, Intermediate, <br />and Small Class III dams and enlargements shall have spillways capable <br />of passing, as a minimum, the 100-year flood as defined in Rule <br />S.A. (S)(d). .. . <br /> <br />Rule S.A.(S)(b)(VI) Hew Minor, Class III dams, and Large and <br />Intennediate Class IV Dams and enlargements .shall have spillways <br />capable of passing the SO-year flood as defined by Rule S.A.(S)(d). <br /> <br />Rule S.A.S. (b)VIl . New Small and Minor Class IV dams and <br />enlargements shall have spillways capable of passing the 25-year flood <br />as defined by Rule S.A. (S)(d). ., <br /> <br />S.A.(S)(b)(VIII) The minimum size spillway for all Class I, <br />II, and III jurisdictional dams, except minor Class Ill, for which an <br />Incremental damage analysis shows a smaller spillway is justifiable <br />under Rule S.A.(S)(c), shall be capable of passing the 100-year flood <br />as defined in Rule 5.A.(5)(d). <br /> <br />5.A.(5)(b)(IX) For dams whose spillway cannot pass the <br />Inflow design flood requirements defined in parts (I) through (VII) <br />above, the engineer may as an alternative, provide documentation that <br />overtopping of the dam by floods which exceed the spillway capacity <br />will not cause failure of the dam. <br /> <br />S.A. (5)(b)(X) The minimum freeboard requirements for new or <br />enlarged dams shall be based upon the maximum height which will <br />prevent overtopping by wave action, or the sum of the inflow design <br />flood maximum water surface level plus one foot of residual freeboard, <br />or a minimum of five feet unless the State Engineer approves a lesser <br />standard for good cause shown. <br /> <br />- 15 - <br />