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3.5.2.2 Period of Records. From inspection of the data in HydroBase, the majority of <br />the reservoirs have very limited historical storage records available. <br />3.5.2.3 Completeness of Records. Table B-4 breaks down the number of reservoirs by <br />size and identifies peak storage volumes for the period of record. Only 235 reservoirs show <br />storage volumes that exceed 1,000 acre-feet. There are 50 reservoirs with storage volumes <br />exceeding 10,000 acre-feet and 23 exceeding 50,000 acre-feet, representing 85 percent and <br />65 percent, respectively, of the total annual storage in Division 1 and Water District 47. <br />For the South Platte River basin HydroBase does not include elevation-area-capacity <br />information, operating rules for the facilities or identify the end user. Storage deliveries to <br />specific users in many cases are coded in the diversion records only if the storage releases are <br />conveyed to the user via a stream. Of the data sources required for the surface water component <br />of the SPDSS, the reservoir data are the most incomplete. <br />3.5.2.4 Reliability of Records. The reservoir data in HydroBase are inadequate for <br />SPDSS purposes. HydroBase has very limited information concerning historical storage records, <br />reservoir inflows, reservoir releases, maximum storage capacity, dead storage and stage area- <br />capacity information. No information is available to identify the ownership of the various <br />accounts in a reservoir. Currently, the operating principles of each reservoir are not available in <br />HydroBase. In addition, HydroBase only keeps track of one source for a reservoir, even if there <br />are multiple sources with the same priority. <br />3.5.3 Additional Data Required <br />For water resources planning, a complete record of physical and operational data for the study <br />period of record is needed for major storage facilities in Division 1 and Water District 47. <br />The data collection effort would next concentrate on identifying major reservoir structures <br />(defined as those approximately greater than 10,000 acre-feet) in the basin. Then, DWR <br />personnel and the owners of the selected key reservoirs would be interviewed to collect available <br />hydrologic data, document use of the reservoirs and develop operating rules. The hydrologic <br />data collected through these efforts would be digitized and incorporated into HydroBase and <br />missing historical storage records estimated. <br />It is anticipated that the surface water modeling effort would be divided into several phases. In <br />the first phase, the major reservoir structures in the basin would be simulated and the smaller <br />reservoir structures would be incorporated into subsequent phases. As shown in Table B-4, <br />there are 50 reservoirs with reported annual storage greater than 10,000 acre-feet. The data for <br />these structures would be gathered. Based on previous modeling experience in the South Platte <br />River basin, several of the reservoirs with capacities less than 10,000 acre-feet have significant <br />impacts on basin operations. Data for these reservoirs would also be collected during SPDSS <br />implementation. It is reasonable to estimate that data would be collected for up to nine of these <br />smaller reservoirs. Table 3-1 summarizes the additional reservoir data required. <br />p:data\gen\spdss~final report\chapter 3.doc 3 -12 <br />October 31, 2001 <br />