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<br />If' " <br />C ti ~:.. <br /> <br />'Reservoir Operations <br />Area-capacity and elevation-capacity functions have been estimated based on tables generated by the US Army Corps of <br />Engineers and Bureau of Reclamation. These are necessary for volume accounting, evaporation estimation, recreational <br />benefits, and hydropower production. <br /> <br />Average evaporation data has been entered for EI Vado, Abiquiu, Heron, and Cochiti Reservoirs. Data needs to be acquired for <br />Elephant Butte and Caballo. <br /> <br />There is a term in the objective function that maintains the surface area of Cochiti Lake at 1200 acres, as stipulated in the Corps <br />of Engineers Water Control Manual. This requirement was not put in the constraints because in periods of reduced flows it will <br />most likely not be met and the result will be an infeasible problem. By placing it in the objective the surface area can vary, but <br />any variation alters the objective value; so this introduces a cost into the model that shows the user the value of water used for <br />maintaining a specified surface area at Cochiti Lake. Jemez Canyon Reservoir is used only for flood control, so it is ignored for <br />the time being. <br /> <br />Future Work <br /> <br />'Upstream of Lobatos <br />Dr. Marshall Frasier and Dr. Robert Young are developing a model that treats the San Luis Valley as a separate unit. One <br />advantage to this approach is that more details can be included and the output will be more comprehensive than would be <br />possible in a basin-wide model. Dr. Frasier and his graduate assistant, Mark Sperow, are developing a model that will use <br />annual inflow, starting aquifer storage, and basinwide equilibrium water values to produce a monthly streamflows at Lobatos, <br />ending aquifer storage, and agricultural benefits accruing to the San Luis Valley. The basinwide equilibrium water values will <br />be used in the future to estimate the quantity of water that farmers would be willing to sell or rent across state lines if interstate <br />water banking were to occur. This approach is acceptable to other members of the research team because Colorado has no <br />significant storage to complicate water allocation under the Rio Grande Compact. :l: <br /> <br />'Downstream of Lobatos <br />The major challenges being faced are incorporating aquifer parameters and benefits functions for, agricultural and' municipal <br />uses. The model is becoming complex, and it may be necessary to run a series of small models for each node and have a the <br />basin-wide model only be a skeleton that links the smaller models. The model is reaching the size limit allowed by the <br />available software. Once equations have been estimated, experimentation for the best way to proceed will be required. <br /> <br />6 <br />