FLOOD04360 - Laserfiche WebLink

Home Browse Search

:( " APPENDIX A - PROJECT PLANNING INTERIM REPORT ON REVIEW SURVEY FOR FLOOD CONTROL ARKANSAS RIVER AND TRIBUTARIES LAS ANIMAS, COLORADO, AND VICINITY LAS AN I MAS .LOCAL PROTECT ION PROJECT I. GENERAL.- Three al ignments for levees to protect Las Animas and vicinity from Arkansas River floods were studied. These plans have been designated as Plans A, B, and C, and their locations are shown on plate 2 fol lowing the main report. Of the plans investigated, PI<:ln,C was selected tor recomlOOndation and is described in the fol lowing paragraphs. Plans A and B are described under OTHER PLANS OF IMPROVE- MENT INVESTIGATED. 2. The selected plan consists essentially of a levee 9.6 mi les in length along the right bank of the Arkansas River, to protect Las Animas and vicinity from Arkansas River floods, and a short levee about one mi Ie long on the left bank to prevent inundation of a highway. The levees are designed to discharge flows up to 140,000 c.f.s. An aerial view of the general plan is shown on plate I. 3. The right bank levee wou I d or I 9 i nate on high ground approx, 1- mately 5t mi les west of Las Animas and extend north across the intake works of the Las Animas Consol idated Canal and the main I ine of the AT&SF Rai Iway System to the river bank and then fol Iowa northeastward course across the Las Animas Town Ditch, U.S. Highway 50, and the Arkansas Valley Branch line rai Iroad bridge. From the rai Iroad bridge, the levee would bend back southeastward around the city to the county road crossing over the main I ine of the AT&SF, turn west across tQe road, and fa I low the north side of the ra i I road for about 1./3 mile. Intake structures would be provided where the levee crosses the Las Animas Consol idated Canal and the Las Animas Town Ditch. Outlet structures would be instal led through the levees for the dispos<:ll of interior drainage waters and serve as wasteways for the irrigation canals. An interior drainage ditch would be located adjacent to the levee, beginning about one mi Ie northwest of the city and terminatin9 at an outlet structure about three mi les downstream. Culverts would Os provided where the interior drainage ditch passes under U.S. High- way 50 and the Arkansas Val ley Branch I ine of the AT&SF. Two ponding areas wou I d be prov i ded to store inter i or dra i nage waters dur Lng periods of high river flows. The main I ine of the AT&SF would be raised 6 feet at the levee crossing near the upstream end, and the bridge on the branch I ine which crosses the Arkansas River nortn of Las Animas would be altered to provide a larger waterway opening. Other appurtenant works include levee protective measures and,a sma I I sewage pumping plant near the lower end of the levee. A-I R 1/28/64