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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />1499 <br /> <br />The area is relatively stable with respect to recorded seismic <br /> <br /> <br />events. There have been no recorded epicenters within a 200-mi1e <br /> <br /> <br />radius of the study area during the period of seismic record (1870- <br /> <br /> <br />1979). No significant active faults have been mapped in the <br /> <br /> <br />vicinity of the dam sites. <br /> <br />The published literature is inadequate to assess the source, quality <br />and availability of riprap materials. Embankment materials should <br />be available in sufEicient quantities in the floors of the canyon. <br />The quality of these materials and any needs for processing cannot be <br />determined from the published literature. <br /> <br />D.4.8 Flood Hydrology and Spillway Requirements <br />Flood capacity and spillway design of the dam and reservoir must meet <br />the requirements of the Colorado State Engineer in effect at the <br />time. The State Engineer presently requires that large dams be <br />designed to withstand the Probable Maximum Flood (PMF) or a lesser <br />Inflow Design Flood (IDF) if a dam break incremental damage analysis <br />shows that the loss of life or property damage would not be greater <br />than if the dam had not been constructed. <br /> <br />It is believed a dam and reservoir of the size and at the locations <br />being considered should not be classified in the high hazard <br />category. The potential for loss of life downstream appears to be <br />related only to the inhabitants of scattered Indian dwellings which <br /> <br />24 <br />