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<br />Local Storm . <br />10,000 - 11,500 ft MSL <br />11,501 - 13,000 ft MSL <br />Above 13,000 ft MSL <br /> <br />.75 (.8 PMP) <br />.75 (.7 PMP) <br />.75 (.6 PMP) <br /> <br />.50 (.8 PMP) <br />.50 (.7 PMP) <br />.50 (.6 PMP) <br /> <br />Minor - General Storm East <br />6,000 - 12,000 ft MSL <br />Above 12,000 ft MSL <br />General Storm West <br />5,000 - 8,000 ft MSL <br />Above 8,000 ft MSL <br />Local Storm <br />10,000 - 11,500 ft MSL <br />11,501 - 13,000 ft MSL <br />Above 13,000 ft MSL <br /> <br />.50 (.8 PMP) <br />.50 (.7 PMP) <br /> <br />.50 (.8 PMP) <br />.50 (.7 PMP) <br /> <br />.50 (.8 PMP) <br />.50 (.7 PMP) <br />.50 (.6 PMP) <br /> <br />6.1.4.1.1 Existing Large and Small High Hazard dams shall have spillways <br />capable of passing, as a minimum, the IDF generated by 75 percent of90 <br />percent of the probable maximum precipitation, unless an incremental <br />damage analysis demonstrates a lesser flood is acceptable, but not less than <br />the inflow design flood generated by a 24-hour, 100-year rainstorm event. <br /> <br />6.1.4.1.2 Existing Minor High Hazard dams and Large and Small Significant <br />Hazard dams shall have spillways capable of passing as a minimum, the IDF <br />generated by 50 percent of 90 percent of the probable maximum <br />precipitation, unless an incremental damage analysis demonstrates a lesser <br />flood is acceptable, but not less than the inflow design flood generated by a <br />24-hour, 100-year rainstorm event. <br /> <br />6.1.4.1.3 Existing Minor Significant Hazard dams and Large and Small Low <br />Hazard dams shall have spillways capable of passing the inflow design flood <br />generated by a 24-hour, 100-year rainstorm event. <br /> <br />6.1.4.1.4 Existing Minor Low Hazard, and Large NPH dams shaH have <br />spillways capable of passing the inflow design flood generated by a 24-hour, <br />50-year rainstorm event. <br /> <br />6.1.4.1.5 Existing Small and Minor NPH dams shall have spillways capable <br />of passing the inflow design flood generated by a 24-hour, 25-year rainstorm <br />event. <br /> <br />6.1.4.2 For dams whose spillway cannot pass the IDF as defined above, the engineer <br />may, as an alternative to constructing a larger spillway, provide documentation that <br />overtopping by floods that exceed the spillway capacity will not cause failure ofthe <br /> <br />27 <br />