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<br />unless an incremental damage analysis demonstrates a lesser inflow <br />design flood is applicable. <br /> <br />5.A. (5)(b)(III) New'Large Class II dams and enlargements <br />shall have spillways capable of passing, as a minimum, the inflow <br />design flood generated by 75 percent of the Probable Maximum <br />Precipitation, unless an incremental damage analysis demonstrates a <br />lesser inflow design flood is applicable. <br /> <br />5.A.(5)(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 50 percent of the Probable <br />Maximum Precipitation, unless an incremental damage analysis demon- <br />strates a lesser inflow design flood is applicable. <br /> <br />5.A.(5)(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 />5.A.(5)(d). <br /> <br />Rule 5.A.(5)(b)(VI) New Minor, Class III dams, and Large and <br />Intermediate Class IV Dams and enlargements shall have spillways <br />capable of passing the 50-year flood as defined by Rule 5.A.(5)(d). <br /> <br />Rule 5.A.5.(b)VI1 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 5.A.(5)(d). <br /> <br />5.A,(5)(b)(VIII) The minimum size spillway for all Class I, <br />II, and III jurisdictional dams, except minor Class III, for which an <br />incremental damage analysis shows a smaller spillway is justifiable <br />under Rule 5.A.(5)(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 (1) 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 />5.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 />