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SPDSS Memorandum <br />Final <br />To: Ray Alvarado and Ray Bennett <br />From: LRE -Rick Parsons, Brian McCaig, and Erin Wilson <br />Subject: Task 5 Summary -Key Reservoirs <br />Date: July 1, 2005 -Revised January 22, 2007 <br />INTRODUCTION <br />The Task 5 obj ectives are to: <br />Identify key storage facilities and develop and document an understanding of the <br />operations of key water use facilities in the basin in order to facilitate consumptive use <br />modeling and to support selected data needs for modeling being done by other <br />contractors. This understanding will be developed through interviews with DWR <br />personnel, operators of large canal and reservoir systems, and representatives of federal <br />facilities. Through interviews with reservoir owners and operators, collect historical <br />content data, evaporation data, and information regarding reservoir accounts, dead <br />storage, and release rates. Fill missing reservoir end-of-month contents. <br />BACKGROUND <br />Key reservoirs were defined in the SPDSS Feasibility Study as reservoirs with greater than <br />10,000 acre-feet (ac-ft) decreed storage capacity. Based on this criterion, fifty key reservoirs <br />were initially identified through review of the water rights tabulation in the HydroBase database <br />(Version 20060816). The Feasibility Study also anticipated that up to nine additional, smaller <br />reservoirs would be identified as key reservoirs based on their impact to administration, for a <br />total of 59 key reservoirs. <br />Under Task 5, twenty-eight operating memoranda were developed that identified 42 additional <br />reservoirs (101 total reservoirs) that should be considered key, resulting in a total of 51 key <br />storage facilities and storage systems. Reservoir systems, as defined herein, are a group of <br />reservoirs either on the same tributary, filled by the same diversion structure, or operated in a <br />similar fashion to satisfy a common demand. The operational memoranda summarize available <br />information related to physical characteristics of the storage facilities, water rights, accounts <br />particular to the storage facilities, available historical end-of--month contents data, methods used <br />to fill missing data, and operational information regarding the use of the storage within the <br />context of the entity's complete water supply system. <br />The list of operational memoranda and key reservoirs/reservoir systems is summarized in Table <br />1. Table 2 includes recommendations for modeling of reservoir accounts, physical structure <br />characteristics, and a summary of the sources/methods of filling missing end-of--month contents <br />Page 1 of 11 <br />