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:d.....l :.. ouoaSl South Platte Water Rights Management System voirs upon request and to add new reservoirs that did not yet exist when the USGS topo- graphic base was published. Attributes The reservoirs layer contains only the attributes generated and used by ArclInfo for describing and manipulating linear data. Other Streams Layer The other streams layer contains small streams and other water features included in the USGS DLG that were not necessary for SPWRMS modelling. Development The other streams linear layer was separated by performing bulk operarions on the DLG mosaic. Elements which were not desired in this layer were selected via their coded attributes and deleted. Such elements include map boundaries, aqueducts, ditches, and reservoir shorelines. Stream gauges Layer The stream gauges point layer contains locations and names of gauging stations, which are mostly stream gauges; however, there are some stations on transmountain diversions and reservoirs. Real-time data for gauges is obtained via satellite and transmitted from a VAX at SEO to the SPWRMS database by a UNIX eron process developed at CADSWES. This data transfer utility is described in the SPWRMS Programmer's Manual. Source Data for the stream gauges layer was gathered in two stages. The prototype area was completed first, where a total of 36 gauges were located. Seventeen were identified from gauge locations shown on the USGS I :24.000-scale map series. Changes to the mapped locations came from USGS Water Resources Data for Colorado (e.g., the "Clear Creek at Golden" gauge was moved in 1974). as well as from phone calls and visits to Water Commissioners and SEO Hydrographers. Sixteen gauge locations were provided by the City of Aurora. Finally, gauges located on the three structures classified as transmoun- tain-the Roberts and Hoosier Pass Tunnels and the Denver Metro STP-were located by inference from the USGS hydrography layer. The inferred location of the Metro STP was corrected according to information later provided by the District 8 Water Commissioner. The second stage of data development involved obtaining a list of gauge data available via satellite. Locations for the additional gauges were determined in consultation with SEO. Development Locations of gauging stations were hand-digitized by CADSWES from paper source materials using Arennfo. During the data entry procedure, gauge numbers and water district IDs were specified as attributes of the gauges. Locations of the gauges were then adjusted so that the points would land exactly on lines of the stream network. In most cases, gauges were moved less than 50 meters on the ground (.05 cm on 1: 100.0OD-scale map) to achieve this match. This procedure proved a good test of digitizing accuracy. ArclInfo utilities were then employed to create corresponding nodes in the stream network so that the gauge locations could be located by the SPWRMS application via the in-memory stream network. Database Manual 17