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<br />5.4 Flood Insurance Rate Map Description <br /> <br />The Flood Insurance Rate Map for Trinidad is, for <br />insurance purposes, the net result of the Flood Insur- <br />ance Study. This map (published separately) contains <br />the official delineation of flood insurance zones and <br />base flood elevation lines. Base flood elevation <br />lines show the locations of the expected whole-foot <br />water-surface elevations of the base (lOO-year) flood. <br />This map is developed in accordance with the latest <br />flood insurance map preparation guidelines published <br />by the Federal Insurance Administration. Where the <br />channel capacity of the tributaries is sufficient to <br />contain the 100-year flood, the special flood hazard <br />zone is limited to the width of the channel, and thus <br />cannot be shown on the Flood Insurance Rate Map. Base <br />flood elevations in these areas can be read directly <br />from the profiles. <br /> <br />6.0 OTHER STUDIES <br /> <br />The U. S. Army Corps of Engineers has completed a Flood <br />?lain Information Report for Trinidad, Colorado, and vicinity <br />that provides data for the Purgatoire River and Tributaries <br />(Reference 1). Other flood studies completed by the U. S. <br />Army Corps of Engineers are the Trinidad Reservoir Project, <br />Purgatoire River, Trinidad, Colorado; and the Arkansas River <br />Basin, Project Report, Pinon Canyon Dam, Trinidad, Colorado <br />(Reference 7). <br /> <br />The Soil Conservation Service has published a Watershed Work <br />?lan, Fishers Peak and Carbon Arroyos. Results were com- <br />patible with data presented here. <br /> <br />A flood Insurance Study for the unincorporated areas of Las <br />Animas County, by Gingery and Associates, Inc., produced <br />elevations on the Purgatoire River slightly different from <br />those originally produced for this study. As mentioned in <br />Section 3.1, flood profiles for the river were adjusted to <br />match this data. <br /> <br />A comparison between the Trinidad and the Las Animas County <br />studies revealed that the Las Animas County study had <br />incorrect corporate limits for Trinidad. This results in <br />an apparent disagreement between Purgatoire River flood <br />profiles for the city and the county. However, the profiles <br />are consistent and the incompatibility is in the corporate <br />limit designation due to Tri~idad'sannexation of areas with- <br />in Las Animas County along t~e Purgatoire River. <br /> <br />. <br /> <br />16 <br />