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I I I II I I I I I I I I I I I I I I I 6 2. Channelization of the San Antonio River hss bsen started and is scheduled to be completed in late 1970 or early 1971. This project has been enlarged to include a control structure which has an estimated cost of $25,000. Construction is scheduled for the summer of 1970. This structurs will permit control of all normal flows of water in the San Antonio River and will decrease lossea considerably as water which previously flowed in the south channel suffered substantial loss by avapotranspiretion. It is bslieved that the construction of the control structure and channelization of the San Antonio River will aid the Conejos River water users in meeting their Compact delivery. 3. Channplization of the Rio Grande south of Alamosa has been seriously considered by the Board of Directors and it is believed that this project should be accompliahed prior to or concurrently with con- struction of the Cloaed Baain Drain project. Losses of water caused by lack of an adequate conveyance channel add to the problem of Meeting Compact deliveries and decrease the value of all drainage projects which have been or will be constructed unless euch a channelization project is undertaken. Degradation of the Rio Grande channel and uncontrolled growth of phreatophytes along the channel must be srrested and corrected before the full value of any projects tributary to the Rio Grande csn be realized. The nature, cost and magnitude of this project make it one which probably should be combined with the Closed Basin Drain project to realize the greatest benefits and assure proper future control and maintenance. 4. Channelization of Rock Creek has beCOMe the project which is currently in the forefront. The channelization of Rock Creek is believed to be a potentially productive project for increasing the natural return flow to the Rio Grande and providing some much needed drainage of water logged land. The value of the project will depend largely on whether or not the Rio Grande channel can carry the water and be deepened sufficiently to permit gravity drainage from Rock Creek into the Rio Grande. A preliminary engineering study has been authorized by the Board of Directors. All field work and calculstions have been completed. The report will be issued in the near future I therefore, no further reference will be made to the project in thia report. 5. Closed Basin Drsin, although assigned fifth priority in 1968, has become first priority today largely because of a better understanding of the effects of the project as illustrated by ths analog model of the San Luis Valley prepared by U. S. Geologicsl Survey. The analog model has clearly indicated the benefits to be derived from the project 0544