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<br />the cost of local side drainage inlets and of re"ision of irrigation diver-
<br />sion facilities within the project limits; and (e) maintain and operate
<br />all the works after completion in accordance with regulations pre-
<br />scribcd by the Secretary of War~ However, as no conservation is pro-
<br />vided and in vicwof the national interest in the benefits provided to
<br />important transportation facilities, no participation in direct construc-
<br />tion costs othor than (d)' above, should be required of local interests.
<br />The city of Trinidad, by resolution, has agreed to meet the require.'
<br />ments for local cooperation' outlined above. '
<br />113. Conclusions.-A serious flood problem exists in the Purgatoire
<br />River Basin at Trinidad, Colo., which not only affects the welfare of
<br />the community, but also involv~s national interests, in that vital trans-
<br />portation facilities, both rail !'lid high,way, aIe subject to extensive
<br />flood damago and attondant mterruptlOn. ]lood damages are sus-
<br />tained also by the agricultural areas in the Purgatoire River, Basin
<br />and by the irrigation diversion structures along the main channoL
<br />There is a demand for the conservation of floodwaters for irrigation,
<br />use. Provision of flood protection to both the Trinidad urban area
<br />and the agricultural areas subject to damage in the Purgatoire River'
<br />Basin, by means of flood control or dual-purpose reservoirs with con-
<br />servation foaturos, is not economically feasible. A combinatjon reser-
<br />voir and channel-improvement project cannot be justified. The most
<br />economical mcthod of providing f1ood,control bonofits to tho Trinidad
<br />urban arca and for the protection of vulnerable transportation facilitics.
<br />located thorein, is tho construction of a channel improvement, within
<br />Trinidad at an estimated .first cost of $1,034,500 and annual charges
<br />, of $42,200. '1'he eS,timated monotarY benefits accruing to the chan.
<br />nel,improvemont projoct closely ap'proximato tho estimated annual
<br />costs, and in cQt.sidoration of the important intangible benefits attend-
<br />ant, its construction is justified.
<br />114. Recommendation.-It is recommendcd that the cha,nnel im-
<br />provement projcet at Trinidad, Colo., be a,dopte,d as the m~st suitable
<br />plan for cssential flood protection in Purgatoire River, Coloc, and that
<br />Federal funds in the amount of $909,000 be appropriated for con.
<br />struction and none for annual maintenance, provided, locltl interests
<br />through their responsible representative agency, furnish assurances'
<br />satisfactory to the Secretary of War that they will: (a) Provide,
<br />without eost to the United States, all lands, easements, andrights--of.,
<br />way necessary for the construction of the project; (b) hold and save
<br />the United States free from damages due to the constrnction works;'
<br />(c) provide the costs of public utility and bridge revisions, relo~ations,
<br />orreplacements; (d) provide the cost of local sidecdrainage inlets and
<br />of revision of irrigation diversion facilities within the project limits;
<br />and (e) maintain and opcrate aU the works after completion in accord.
<br />Imce with ;'egulations prescribed by the Secretary ,of War. It is
<br />further recommended that the first costs of the proj ect be provided in
<br />",lump sum in order to secure economical and advantageous prosecu.,
<br />tion of the work. '
<br />L. ROSENBERG, '
<br />Colonel, C01 p8 of Engineers,
<br />District. Engineer.
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