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II I I I I I I I I I I I I I I I I I I 2'"' (',I~ j0 \) To physically move water from upper basin reservoirs to lower basin reservoirs is predicated on a number of factors including current upper basin storage and the expected runoff from snow melt. The window of opportunity to assess water needs and to move water from the upper Arkansas River basin reservoirs to the lower basin reservoirs (i,e, Lake Henry and Lake Meredith) is considered to be relatively very short, The window of opportunity typically occurs in the months of April and Mayas shown in Figure V-4, In late March and early April, measurements of snow pack, assessing the anticipated runoff volume, and determining current upper basin storage capacity needs provides varying degrees of uncertainty in determining the amount of water needing to be retained at the upper reservoir or conveyed to lower basin reservoirs, As shown in Figure 1-2, the current average April and May deliveries to Lake Meredith are approximately 94 and 240 cfs per day, respectively, Based on the Colorado Canal capacity of 760 cfs, this would allow 666 cfs and 520 cfs of flow in April and May to be diverted, respectively without impacting current users, Storage requirements based on utilizing the additional canal capacity during these two months is approximately 92,000 AF, Based on this criteria, Lake Meredith would need to be enlarged an additional 41,000 AF, The third primary question m the scope of service states: "How will water transfers occur in exchanging water among users", The water transfers will be based upon addressing users needs in the lower and upper Arkansas River having the goal to optimize delivery to, exchanges from, and storage in Lake Meredith and Lake Henry, The opportunity for large water deliveries and transfers will occur in a relatively short time frame as shown in Figure 1-2. Therefore, a water delivery/transfer decision system incorporating anticipated snow melt runoff, reservoir storage availability and other factors needs to be assessed for better optimization of raw water deliveries in April and May. URS Greiner -7-