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3.4.3 Additional Data Required <br />For water resources planning, a complete record of diversions for the study period of record is <br />needed for transbasin diversion structures in the Division. The HydroBase records should, <br />therefore, be supplemented with historical data available from (1) owners of transbasin <br />diversions, (2) DWR hard copies of transbasin data, and (3) USGS records. Missing records <br />(such as Roberts Tunnel deliveries from 1964-1974) will be filled from the owners' records and <br />from USGS records. If these sources are incomplete, the missing record will be estimated. <br />Another effort for this task will involve resolving conflicting records. For example, diversions <br />through Roberts Tunnel are measured at the inlet and outlet of the tunnel and the differences are <br />most likely due to seepage and to measurement inaccuracies. Accurate and complete records of <br />the transbasin diversions are important because the deliveries represent foreign water, which in <br />most cases can be fully consumed by first or secondary uses. The information shown in <br />Table B-3 indicates that the 19 transbasin structures have some periods with incomplete records. <br />These missing data need to be filled and daily records need to be obtained if available. Table 3-1 <br />summarizes the additional transbasin diversion data required. <br />3.5 RESERVOIRS <br />Historical reservoir records are important as a basic water resource data need and for use in water <br />rights administration and modeling. Reservoirs regulate streamflows and are important <br />components of river systems. Reliable reservoir physical and operational data (e.g., storage, <br />stage and releases) are required to accurately develop baseflows and conduct realistic simulations <br />of the historic and future operations of the facilities and their effect on streamflows in the basin. <br />3.5.1 Description and Inventory of Available Data <br />Table B-4 in Appendix B summarizes reservoir storage information that was taken from <br />HydroBase. As with surface water diversions (Section 3.3), the reported values in Table B-4 are <br />based on estimates developed from the current HydroBase database for Division 1 and Water <br />District 47. <br />3.5.2 Data Assessment <br />The available reservoir records were reviewed for spatial coverage throughout Division 1 and <br />Water District 47, the period of record available, the completeness of available records, and the <br />overall reliability of the data. <br />3.5.2.1 Spatial Coverage. In Table B-4 in Appendix B, 2,885 reservoirs are identified <br />in the South Platte River basin and 262 reservoirs in the North Platte River basin, (including the <br />25 reservoirs in the Laramie River basin). This covers the river basins in Division 1 and Water <br />District 47. <br />p:data\gen\spdss~final report\chapter 3.doc 3 -1 1 <br />October 31, 2001 <br />