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3.6.2.1 Spatial Coverage. The HydroBase water rights tabulation for Division 1 and <br />Water District 47 contains records for decreed water rights in the South Platte and North Platte <br />River basins, providing sufficient coverage for SPDSS purposes. However it does not include <br />instream flow and natural lake level water rights information. <br />3.6.2.2 Period of Records. The electronic water rights tabulation includes water rights <br />decreed since the first adjudications in the individual water districts within Division 1 and Water <br />District 47. Call records typically exist for the mainstem of the South Platte River in both hard <br />copy and electronic format since approximately 1930, but only in hard copy format for the South <br />Platte tributaries. <br />3.6.2.3 Completeness of Records. Information in HydroBase indicates what water <br />rights at a given structure have been transferred to other uses but does not provide sufficient <br />detail to describe the terms and conditions of these transfers. For example, many of the water <br />rights in the South Park area of the Upper South Platte River basin were originally decreed for <br />irrigation, but were transferred to municipal purposes in the 1980s and 1990s. HydroBase <br />indicates that these water rights have been transferred to municipal uses but the database does <br />not describe the terms and conditions associated with these transfers. Similarly, the current <br />structure of HydroBase is not designed to include details of augmentation plans and substitute <br />supply plans. CWCB instream flow appropriations are inventoried in the HydroBase database, <br />but are included in the "other" category of water rights listed and are not uniquely identified. <br />Priority call records in paper form are maintained by Division 1 and Water District 47 for the <br />mainstem of the South Platte, but few records are available for the tributary watersheds. <br />3.6.2.4 Reliability of Records. Water rights data in HydroBase provide an accurate <br />summary of the water rights originally decreed for a given structure. It is assumed that the water <br />rights tabulation has undergone quality control review by the DWR and is considered sufficiently <br />accurate for the purposes of the SPDSS. The reliability of information on water rights transfers, <br />augmentation plans and substitute supply plans will be dependent on information filed with the <br />court, digitized by DWR personnel and reviewed by owners. The CWCB maintains an accurate <br />and reliable tabulation of instream flow rights. Call records have been maintained by Division 1 <br />and Water District 47 for the mainstem of the South Platte; however, procedures for recording <br />calls and dry river conditions were inconsistent in the early records. Also, the availability of call <br />records for tributary watersheds is inadequate. <br />3.6.3 Additional Data Required <br />A complete record of the physical and legal attributes of major operating water rights in <br />Division 1 and Water District 47 would be necessary for developing a complete and accurate <br />water resources model. Although the water rights tabulation in HydroBase accurately defines <br />original water rights, it needs to be supplemented with additional transfer decree, augmentation <br />plan, substitute supply plan, CWCB instream flow and priority call data. Additional water rights <br />data required to meet the needs detailed in Chapter 2 are presented in Table 3-1. <br />p:data\gen\spdss~final report\chapter 3.doc 3 -14 <br />October 31, 2001 <br />