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SPDSS Task 4 Memorandum <br />November 23, 2004 <br />Transmountain diversions are unique because they typically start in one Water District <br />and end in a different Water District. As such, most transmountain structures typically <br />have at least two administrative structure identifiers, one for the source basin and one for <br />the destination basin. Administrative diversion records will usually be reported by the <br />Water Commissioner in both the source water district and the destination water district. <br />However, it is the administrative diversion records from the source basin that are coded <br />and accessible as "DivTotal" in HydroBase using the data management interface (DMI) <br />TSTooI (Time Series Tool), developed by the State. <br />Although administrative structure records and state hydrographer station records usually <br />originate from the same set of data, there are often discrepancies when stored in <br />HydroBase. This is generally because Water Commissioner records represent initial <br />"real-time" readings used in administration, and hydrographer records represent data "re- <br />worked" to accurately reflect the hydrologic conditions at the gage. <br />Table 2 shows the continuously monitored station identifiers and administrative structure <br />identifiers for each of the transmountain structures. <br />TSTooI displays and analyzes time series data stored in HydroBase. TSTooI relies on the <br />coding of data as described in the Water Commissioner Manual developed by Colorado <br />DWR and the Office of the State Engineer (SEO). TSTooI allows viewing of data by specific <br />source or use code, and allows viewing of total diversions through a structure. As is the case <br />with most transmountain diversions, administrative data is provided by the water <br />commissioner in the basin of origin as well as the basin of termination. Both sets of data are <br />often stored in HydroBase; however, each set of data is coded differently. Administrative <br />data from the basin of origin is typically coded as diversions by water class (DivClass) <br />whereas data from the basin of termination is typically coded as releases by water class <br />(RelClass). Diversion data coded as RelClass is not accessible through TSTooI. <br />In addition to continuously monitored station data and administrative structure data available <br />through HydroBase, when possible data was obtained from other sources. Additional <br />sources included: <br />• USGS Water Supply Papers, <br />• George Varra, Water Commissioner for Water District 3, <br />• Upper Colorado River Basin StateMod Model, <br />• Northern Colorado Water Conservancy District (NCWCD), <br />• Denver Water Board, <br />• Coors Brewing Company, <br />• City of Aurora, <br />• City of Englewood, and <br />• City of Fort Collins. <br />Page 6 of 19 <br />