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.' " -':', 21. MAINTENANCE OF PROJECT.- Periodic inspection of the chqnnel and levees wQu! d be requ ired. Project ma i ntenance wou I d cons i s.t ma in I y of keep I ng the overbank area cleared in the vic i n ity of and betwe.en the railroad and highway bridges. Minor repairs to the levees, structur.es, and protective works, and removal of debris from the channel may be required following periods of high flow. 22. ESTIMATED PROJECT COSTS AND ANNUAL CHARGES.- A detai led estimate of the first cost and annual charges of the Las Animas Local Protection Project is given in table 2. The total first cost'of $1,725,000 has been al located to flood control and between Federal and non-Federal interests. Most of the material dredged from the lake could be used in the levees; however, there would be certain additional expenditures involved. For example, it is estimated that material dredged from the lake would be somewhat more costly than material ex- cavated from borrow areas located closer to the levees because of the longer haul distance and because some of the material would be from the wet. These additional expenditures would be the responsibi lity of I oca I interests. 23. The al location of costs of the project between Federal and non-Federal interests is in accordance with existing laws and establ ished pol icies relating to local protection projects. Non-Federal interests would be responsible for al I lands, easements, and rights-of-way. In addition, they would bear the cost of alterations to existing improve- ments, other than to rai Iroad bridges, made necessary by the project. These alterations include relocation of uti I ities and roads as wel I as the provision of intake structures for the irrigation canals to pass through the levee. Non-Federal interests would operate and maintain the project. The sewage pumping plant would be provided at Federal expense inasmuch as it would maintain a pre-project condition and would not result in enhancement of an existing faci lity. OTHER PLANS OF IMPROVEMENT INVESTIGATED 24. PLAN A.- The principal feature of Plan A would be a levee 7.0 mi les long on the right bank of the Arkansas River and a left bank levee identical to that included in the recommended plan. The right bank levee would originate on high ground about 2 mi les southwest of Las Animas. The alignment of this levee would be generally north and east to the Arkansas River, as shown on plate 2 fol lowing the main report. From this point downstream, the levee would be the same as for Plan C. In the upstream portion, the levee would require 3 irri- gation control structures, 3 drainage structures, a grade raise of approximately 7 feet for U.S. Highway 50, and a grade raise of approxi- mately 2 feet for the main I ine of the AT&SF. The first cost of this plan would be $1,492,000 and the annual charges, $51,200. 25. PLAN B.- Plan B would include a right bank levee approxi- mately 8.4 mi les in length and a left bank levee identical to that A-7 R 1/28/64