Laserfiche WebLink
<br />3D~~3S <br /> <br />July 7, 1993 <br /> <br />Gunnison Planning Model - Info Theme No. 14 <br /> <br />Information Related to Contract Flow-Support Reaches <br /> <br />(See Info Theme No. 13 for an introductory discussion of minimum streamflow <br />rights and contract flow support reaches.) <br /> <br />The general principle underlying this facet of the model is that there may be <br />particular stream reaches where a certain minimum level of flow is so important that <br />releases from a reservoir will be made, if necessary, to bring the flow in the reach up <br />to the desired minimum level. The required amount of such a release is determined <br />with reference to the flow in the reach "after" considering the allocation of flows <br />among water rights (including minimum streamflow rights) and the possible changes in <br />streamflows that result from project deliveries. The required amount of such a release, <br />however, should be determined with reference to the levels of flow "before" <br />consideration of any operational releases, e.g. for power generation or space <br />evacuation. These dependencies determine the place of the contract release step in the <br />solution step sequence. <br /> <br />The principal criteria for the implementation of contract flow-support releases are <br />(1) that releases for this specific purpose be "protected" between the releasing <br />reservoirs and the destination stream reaches, (2) that the total of all simultaneous <br />releases for flow support purposes not exceed the minimum necessary to satisfy all <br />flow-support reaches, which may be located downstream from one another, and (3) that <br />any water released for flow support in one reach, which is not needed to meet flow <br />support targets in another reach further downstream, become available as "free" water <br />at the bottom of the upstream destination reach. (Such "free" water may be reallocated <br />among downstream water rights in accordance with priority.) <br /> <br />1. <br /> <br />Contract Release Parameters. The contract release step <br />involves both flow-support reaches and reservoirs. The notion of <br />a "contract" suggests a 1: I relationship between a given reach <br />and a specific reservoir, usually the first reservoir upstream from <br />the reach. However, the second criteria listed above can be more <br />easily satisfied if the contract flow support step is designed so <br />that a set of reservoirs and a set of flow-support reaches are <br />operated without specific relationships between individual reaches <br />and reservoirs. On this basis, the following parameters are <br />defined with respect to the contract flow support step: <br /> <br />a. Reservoir Parameters. <br /> <br />(1) Enabled or Not. Each reservoir' <br />represented in the model, except Fairview <br />and Cerro Reservoirs, will have a check- <br />box type control to indicate whether it is <br />enabled to make flow support releases. <br /> <br />L.i <br /> <br />_".__".,_~...""'":c.__,.: ~ <br /> <br />,1 <br /> <br />:J <br /> <br /> <br />f, ":S- <br /> <br />,\ <br /> <br />, <br />" <br />-f <br />~ <br />;j <br /> <br />