OCR Text |
Show Final Report Hydrologic Model Analysis of the Provo River Basin 4.1.4 System Storage Rules System Storage is a water storage concept developed as part of the Utah Lake Distribution Plan ( DWR, 1994). System Storage consists of sufficient water ( 585,000 acre feet maximum) stored in and above Utah Lake, to satisfy the storage rights of Utah Lake water users. ( Utah Lake storage rights are generally senior to those of the upstream reservoirs with the exception of storage of the direct flow waters that were applied historically to the lands inundated by Deer Creek Reservoir.) Thus, it represents all water in storage that could conceivably be called upon by the Utah Lake water users. System storage may be converted to priority storage ( for exclusive use) by upstream reservoir owners once the total system storage exceeds the " conversion line" shown in Figure 4- 1. The PROSIM conversion line is less than the State Engineer's conversion line because the Utah Lake water rights owned by CUWCD have been deducted. System Storage in one reservoir may be exchanged for priority storage owned by PRP or CUP in Utah Lake at any time. In PROSIM, System Storage in Jordanelle and Deer Creek reservoirs is identified and reserved for either PRP or CUP at the time it is stored. The following explanation details how PROSIM simulates the accounting of System Storage so that it is stored for the exclusive use of either PRP or CUP. PROSIM simulates the storage of System Storage above Utah Lake by allocating the volume of water stored to either the Provo River Project ( PRP/ SS) or the Central Utah Project ( CUP/ SS), depending upon which owner stores the water. Once stored, the System Storage cannot be converted to priority storage by an entity other than the one storing it, unless it is subsequently exchanged. The System Storage is still subject to call by Utah Lake, but it is dedicated to conversion by the storing owner. Conversion of System Storage occurs according to priority of water rights, with PRP converting surplus System Storage before CUP, and exchanging PRP Utah Lake storage before CUP exchanges its Strawberry Reservoir water in Utah Lake. In the current simulation of the Proposed Demands Scenario, all System Storage held in Deer Creek and Jordanelle reservoirs is converted to priority storage each year. Because it is critical to the water supply of the CUP, an emphasis has been placed on the storage of " Olmsted power water." The Olmsted power rights permit the storage of surplus Provo River flows by CUP and PRP. But due to the Utah Lake Distribution Plan, it is not necessarily clear at the time water is available for storage, whether it is actually surplus to the needs of the Utah Lake water users. Therefore the Olmsted power water is stored as System Storage, and subsequently converted, exchanged, or released to calls by Utah Lake. January 1998 Page 27 |