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. . . 0912" ... Ii 8' COLORADO WATER CONSERVATION BOARD .,. 8TATe O""I~& .UII..DIN. aeNY." .. DaLD.ADO 'I''''.a. .... KeY.TaN. 'II"'. .)fI'. ~.. January 22, 1953 District Engineer, Albuquerque District, Corps of 1l:ngineers, U. S. A:nrry, P. O. Bax 1538, , Albuquerque, Nell' Mexioo Dear Sir I With reference to your file No. SVlKGC, we are returning under separate cover the draft of Review Report on Survey for, Flood COntrol Purgatoire River, Colorado, which you forwarded to us forcollllllllnts. You have indicated that it is possible that comments received could result in material changes in the present draft of the report, including the recommendations. The report has been reviewed in this office, principal4' with regard to the relations between proposed operating procedures and exi,sting water rights and water laws, ;lncluding the Arkansas River Compact between Colorado and Kansas. The importance of the proposed project with respect to the protection llJId e,conomic welfare of the Trinidad area is fully recognized. It is lilso fully recognized that, in the interest of the facilitation of possible agreement among all affected and interested parties as, to, the desirability of the project, the report on the project should clearly show,that the project features llJId proposed method of operation are compatible with such water rights and water laws. The following comments and suggestions are submitted with that purposa in view. The draft of report states that the channel capacity at which general flooding beginS, for the Purgatoire River below the Trinidad dam site at Trinidad and vicinity, is 15,000 cubic feet per second. Also, that flood reports indicate that damage from bank caving which is prevalent, begins at about 5,000 cubic feet per second. The routing studies were stated as being made starting with the reservoir full to the top ,of the conservation pool (94,000 acre feet). According to Plate,), J\ppendix A of the report, the outlet discharge with water surface at that elevation )'iOuld be approximate4'4, 100 cubic feet per second, and would decrease, to slightly over 1,000 cubic f,eet per second at elevation 6,3;20. Should a floo.d occur when the conservation pool was empty' or on4'partial4' full, <ti.scharge from the proposed outlet could be in amounts oonsiderably less than the 5,000 cubio feet per seoond at which bank oaving begins. APPENDIX G Exhibit No. 12 Page 1 of 4 ,< - 'v,;,;.~~'-'" .'.',./~ .