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Colorado's Plan For Future Depletions January 12, 1998 <br />Documentation as Required by Cooperative Agreement, Page 9 <br />MiTestones W6-1, W7-1, W8-1, and Tab 3B(I)E <br />4.6.6 Native South Piatte Storage - Diversion Pattern <br />It is assumed that additional South Platte water would be developed by storage and that all <br />storage would occur during the months of April through July, with most storage occurring <br />during May and June. • <br />4.6.7 Native South Platte Storag,e - Use Pattern <br />The storage use pattern was developed based on average monthly use patterns for the City of <br />Boulder as a typical provider. Stored South Platte water is used primarily during August <br />through Mazch when natural stream flows are relatively low. <br />4.7 Transit Loss Factors <br />Assumed transit loss factors are those which were included in Tab 3B of the Cooperative <br />Agreement. A distance of 145 miles was used to represent the weighted average distance <br />between municipal providers in the three Regions and the Julesburg gage. <br />5 North/Central/South <br />Each of the sheets labeled North, Central and South contain a graph and table showing the <br />expected accretions/depletions associated with population growth and water supply activities <br />within the respective region. <br />5.1 Graphs <br />The graphs in each of these four sheets portray the results shown in the row labeled "Total <br />AccretionsJDepletions" in the tables below the graphs. <br />5.2 Seasonal Accretions/Depletions <br />Each of the North, Central and South sheets contains a table depicting the calculated seasonal <br />accretions/depletions attributable to each water supply source. The calculations are described <br />below. <br />5.2.1 "New" Transbasin Imports <br />For each region, the accretions/depletions for each month from new transbasin imports are <br />calculated as follows: regional new municipal water use x <br />% of transbasin imports in each region's water supply mix x <br />transbasin imports use pattern?for that month x <br />monthly municipal return flow factor for that month.