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The results of the historical South Platte River calls were reviewed in the context of water <br />development and changes in river administration in the basin. Main stem calls can be <br />characterized based on two regions that represent effects upstream and downstream of Water <br />District 2. LRE analyzed the water right priorities, including bypass calls, which would have <br />historically called out a junior water right below the Jay Thomas Ditch and a junior water right <br />above the Burlington Ditch. Of note, many of the calls that affect the South Platte River above <br />the Burlington Ditch also affect rights below the Burlington Ditch down to the Jay Thomas <br />Ditch. <br />• Water District 2 below the Jay Thomas Ditch was chosen to identify calls originating <br />mostly from the South Platte River downstream of the Cache la Poudre River confluence <br />(i.e., Water Districts 1 and 64) and to account for the major post-1950 water <br />developments in the basin (e.g., C-BT and other transbasin supplies). <br />Water District 2 above the Jay Thomas Ditch and, in particular, above the Burlington <br />Ditch, was chosen to identify calls originating mostly from the South Platte River <br />downstream of the Clear Creek confluence (i.e., Water Districts 1, 2, and 64). In addition <br />to addressing other water developments that have occurred lower in the river basin, <br />analysis of calls affecting the river above the Burlington Ditch would likely represent the <br />effect of increased upstream DWB exchange of water supplies and subsequent removal of <br />water from the river system. <br />Calls from 1950 to present have changed based on changing water demands and uses of water, <br />available water supplies, varying climate, and river administration practices. Historical daily <br />calls in the South Platte River basin below the Jay Thomas Ditch are summarized with dots <br />(direct flow rights) and triangles (storage rights) in Figure 1. Common calling rights are <br />highlighted on the figure to provide reference. Historical recorded calls occurred predominantly <br />during the summer. As shown in Figure 1, 1929 refill calls have occurred more frequently <br />starting in the mid-1970s. Additionally, junior recharge calls started occurring more frequently in <br />the late-1980s/early-1990s to provide supplies for augmenting out-of-priority well depletions. <br />A significant amount of information is presented in Figure 1. A stepwise discussion of the <br />information in the figure is presented below (generally following the information in the figure <br />from top to bottom): <br />• The upward-sloping, solid line on the top of the graph illustrates the upper boundary of <br />water rights that could place a call (e.g., a 1950 priority in 1950; a 2005 priority in 2005). <br />This shows how the recent, junior recharge water rights (red dots on top right of figure) <br />have only occurred since the late-1980s because they have been adjudicated in the last 20 <br />or so years. <br />• Over time, recorded storage calls have become more frequent (thicker amount of blue <br />triangles on figure) and more junior - in particular, see calls in Figure 1 by the 1914 <br />North Sterling fill right (admin. no. 26302.23522 -green triangles), the District 1 refill <br />rights (admin. no. 31423.29219 -green triangles), and adjudication and administration of <br />the 1972 and junior recharge rights (admin. nos. 446993.0 and higher -red triangles). <br />Page 8 of 14 <br />