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<br />001988 <br /> <br />La Plata River Compact <br /> <br />The La Plata River basin in an unregulated river that is operated by criteria established by the La <br />Plata River Compact. These criteria can be summarized as: <br /> <br />. Adjusted Hesperus Flow = Gaged stream flow + <br />La Plata and Cherry Creek Ditch Diversions + <br />Pine Ridge Ditch Diversions + <br />Keller Ditch Diversions <br /> <br />. Adjusted State line Flow = Gaged stream flow + <br />Pioneer Ditch Diversions + <br />New Mexico ponions of Enterprise Ditch <br /> <br />The adjustments account for upstream diversions. In addition, cenain periods of the year determine <br />additional adjustment such as: <br /> <br />. If date > February 15 or date < December I and Adjusted State line Station < 100 cfs <br /> <br />Then <br /> <br />Target State line flow = Minimum (0.5 * Adjusted Hesperus Flow, l00cfs) <br /> <br />Mancos Proiect (Jackson Gulch Reservoir) <br /> <br />Jackson Gulch Reservoir is an off-stream reservoir with a gravity diversion from the Mancos River. <br />The filling and release criteria can be summarized as: <br /> <br />. Reservoir Filling: Minimum (Natural Flow, Diversion capacity) Zero in Dec., Jan. or <br />Feb.) <br /> <br />Diversion capacity is 258 cfs. <br /> <br />. Reservoir Releases: Minimum (Irrigation and M&I demands, Outlet works capacity) <br />Outlet works capacity is 280 cfs. <br /> <br />Simplified Criteria <br /> <br />There was no attempt to implement daily operating criteria within the SJRIP Hydrology Model <br />because the natural flows used for input hydrology were monthly values. Disaggregation of monthly <br />values to daily values is problematic as was discussed in Chapter 2. See section 6 in the Natural <br />Flow and Historic Depletion Analysis chapter of this document. Instead, an emphasis was placed on <br />matching historic operations on a monthly basis. It was possible to model SJC Project explicitly by <br />storing historic daily flows in a data object and handling the daily to monthly flow accumulation in <br />rules. See Section 1.1 in the Simulation Scenarios and Model Runs chapter of this document. <br /> <br />DRAFT - SJRIP Hydrology Model Documentation <br />June 18, 1999 <br /> <br />49 <br />