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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 />One of the ~ajor deficiencies of Comanche Dam is inadequate spillway <br />capacity. Even though maintained in good operating condition, the service <br />spillway and auxiliary spillway are too small to handle the inflow design <br />flood resulting from the 3/4 probable ~aximum precipitation (PMP), as required <br />by the SEO for existing high hazard dams. <br /> <br />2.5 Summary of Deficiencies <br /> <br />This section sUr.1r.1arizes the technical deficiencies at Comanche Dam as noted <br />during the on-site inspections and from the review of project records. The <br />deficiencies are listed in order of potential impact on the safety of the <br />exi sti ng structure. Thi s pri ori ti zed 1 i st of defi ci enci es was used to focus <br />the geotechnical evaluation, hydrologic analysis, and served as a guide for <br />the development of rehabilitation alternatives. <br /> <br />o <br />o <br /> <br />Uncontrolled embankment and foundation seepage. <br />Hi gh er.1bankment phreatic level and excessive <br />pressures resul ti ng in potenti al i nstabil i ty of the <br />downstream slope. <br />Inadequate spillway capacity to route the 3/4 PMP flood. <br />Poor condition of the entire Hourglass outlet works. <br />Minor defects in the Main outlet works conduit. <br />Erosion of riprap protection on upstream face. <br />Poor condition of grass erosion protection on downstrea~ face. <br /> <br />pore <br />steep <br /> <br />foundation <br />relatively <br /> <br />o <br />o <br />o <br />o <br />o <br /> <br />2084H <br /> <br />-9- <br />