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<br />3. PurDose and SCODe of StudY. <br /> <br />The purpose of this study is to develop an inventory of <br />levees along the Colorado River to assist Colorado in its <br />planning efforts to provide flood protection in the Grand Valley. <br />The inventory includes review of past literature, description of <br />current hydrology, levee inventory and narrative descriptions, an <br />annotated map showing levee locations, and description of <br />potential future efforts in this planning program. It should be <br />fioted that the scope of the work did not include soils analyses, <br />hydraulic analyses, or subsurface inspections as part of the <br />inventory. <br /> <br />4. Review of Other Studies. <br /> <br />Several studies of the Colorado River within the $tudy reach <br />have been conducted in the recent past. Most of.these studies <br />were related to flood protection or delineation of flood-prone <br />areas. A summary of the purpose, contents, and location of each <br />of the listed studies is provided in this section. <br /> <br />In November 1976, the Corps prepared a report titled "Flood <br />Hazard Information, Colorado River And Tributaries, Grand <br />Junction, Colorado." The purpose of the report was to describe <br />and illustrate the flood hazard in the vicinity of Grand <br />Junction, Mesa County, Colorado. The report covers the Colorado <br />River from 22 Road to 32 Road (stations 381 to 393.0) including <br />several tributary streams. This report presented flow-frequency <br />information for the 100- and 500-year flows, delineated the <br />100-year and 500-year floods on orthophoto maps, and provided <br />water surface profiles for the study reach. This report was used <br />as the basis for the Federal Emergency Management Agency Flood <br />Insurance Study of 1985 for Mesa County prepared by the Corps. <br /> <br />< <br /> <br />In July 1982, the Federal Emergency Management Agency (FEMA) <br />published the "Flood Insurance study, City Of Grand Junction, <br />Mesa County, Colorado." The "Flood Insurance study, Mesa: County, <br />Colorado," was subsequently published in December 1985. These <br />studies contain basic hydrologic and hydraulic information for <br />the study reaches, including summaries of community descriptions, <br />flood problems, flood protection measures, and definitions for <br />flood insurance purposes. The reports used 1976 Corps hydrology <br />developed for the flood hazard information study described above. <br />The reports also contain water surface profiles for the study <br />reaches. The river reach addressed by the Mesa County study <br />extends from station 380.2 to station 402.8. The river reach for <br />the Grand Junction study extends from station 385.2 to station <br />388.8. <br /> <br />2 <br />