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produce w11at is referred to in this TM as a daily mass balance. Details on the mass balance and <br />subsequent data processing are described >11 Section 2. <br />Inflows included the Streamflow into the reach defined by the upstream flow gage, streamflows <br />from tributaries, industrial and municipal discharges, and reservoir releases. Outflows included <br />85 key diversions and 10 aggregate points as defined in SPDSS Task 3 Memorandum (LRE, <br />2007a) and stream outflow defined by t11e downstream flow gage. Diversions defined as key <br />diversion structures were identified as diversion structures representing the approximately <br />upper 85 percent of net absolute decreed water rights within each water district in the SPDSS <br />study area. Diversions defined as aggregate points are groupings of diversions which were not <br />identified as key diversions (LRE, 2007a). The inflows and outflows used u1 this analysis are <br />listed from upstream to downstream separately for each reach in Appendix A. Straight-line <br />diagrams displaying the surface water inflows and outflows within the SPDSS study area Have <br />been developed by Colorado Division of Water Resources (CDSS, 2007) and show their <br />locations schematically. The data collection, filling of nussing data and f>11a1 analysis of inflow <br />and outflow daily records are described below. <br />1.2.1 Streamflow Data <br />Daily streamflow data recorded for each gage utilized was obtained from HydroBase using <br />TSTools. Tl1e TSTool command files used to obtain these data are included in Appendix B. An <br />evaluation of the data obtained indicated that several stream gage records were incomplete. <br />Since a daily record is required for each component of t11e mass balance, various filling <br />techniques described below were implemented to fill the missing data. Table 2 depicts the <br />percentage of daily records nussing for each gage which defined the reaches used in the <br />analysis based on stream gage locations. <br />Table 2 -Missing Streamflow Data for Gages that Defined the Reaches <br /> <br />Station <br />ID <br />Station <br />Abbreviation <br /> <br />Station Name Percentage of <br />Missing Data <br />(1950-2005) <br />6708000 PLAWATCO SOUTH PLATTE RIVER AT WATERTON 0% <br />6709500 PLULOUCO PLUM CREEK NEAR LOUVIERS 27% <br />671000 PLADENCO SOUTH PLATTE RIVER AT DENVER 0% <br />6720500 PLAHENCO SOUTH PLATTE RIVER AT HENDERSON 0% <br />6721000 PLALUPCO SOUTH PLATTE RIVER AT FORT LUPTON 1~% <br />675000 PLAKERCO SOUTH PLATTE RIVER NEAR KERSEY 0% <br />6758500 PLAWELCO SOUTH PLATTE RIVER NEAR WELDONA 5°0 <br /> <br /> <br />6759910 <br /> <br />PLABALCO SOUTH PLATTE RIVER AT COOPER BRIDGE NEAR <br />BALZAC AND SOUTH PLATTE P`iVER AT <br />BALZAC,CO (COMBINED) <br /> <br />0% <br />676000 PLAJUCCO SOUTH PLATTE RIVER AT JULESBURG (COMBINED) 0% <br /> <br />6752000 <br />CLAFTCCO CACHE LA POUDRE AT CANYON MOUTH NEAR <br />FORT COLLINS <br />0% <br />6752500 CLAGRECO CACHE LA POUDRE NEAR GP~EELEY 0% <br />6713500 CHEDENCO CHERRY CREEK AT DENVER, CO. 23% <br />6712000 CHENEFCO CHERRY CREEK NEAR FRANKTOWN, CO. 0% <br />SPDSS Phase 4 Task 46 Technical Memorandum -Final <br />0~4i 10108 <br />