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Data required for the SPDSS modeling efforts and reviewed in the data assessment <br />performed as part of the FS include the following: <br />- Streamflow gage records <br />- Surface water diversion records <br />- Transbasin diversion records <br />- Reservoir content and operational information <br />- Climate data <br />- Land use data <br />Streamflow Records <br />A summary of available Streamflow gage records for the North and South Platte River <br />Basins was provided in the SPDSS FS in Table B-1 of Appendix B. Based on the SPDSS <br />FS and additional review of Streamflow records stored in HydroBase, it was determined <br />that the spatial coverage, completeness, and reliability of data are good for water <br />resources planning purposes from 1950 to present. <br />Diversion Records <br />An assessment of available surface water diversion records was performed in the SPDSS <br />FS. The assessment of surface water diversion records found that while spatial coverage <br />of surface water diversion structures is good, the recorded and digitized data throughout <br />the study period of 1950 is incomplete. Table 1 shows that less than 50 percent of the <br />ditches in each water district have records stored in HydroBase prior to 1970. However, <br />Les Dalby with Division 1 indicated that fewer headgate diversion records were kept <br />prior to the mid-1970s due to manpower and technology limitations and that, in general, <br />larger ditches and ditches key to administration were measured. He believes that <br />available records have been digitized and entered into HydroBase, although there maybe <br />infrequent data for smaller ditches with estimated annual diversions provided by the user. <br />Table 1 <br />Structures with Diversion Records in HydroBase prior to 1970 <br />Water <br />District Number of Structures with <br />Records in HydroBase Number of Structures with <br />Records Prior to 1970 Percent with Records <br />Prior to 1970 <br />1 418 172 41% <br />2 108 18 17% <br />3 104 37 36% <br />4 166 35 21% <br />5 124 47 38% <br />6 148 68 46% <br />7 140 32 23% <br />8 289 52 18% <br />9 59 19 32% <br />47 520 174 33% <br />48 63 0 0% <br />76 2 0 0% <br />64 77 33 43% <br />80 145 0 0% <br />23 418 172 41% <br />Page 2 of 21 <br />