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reasons, we will concentrate our attention on the question of storage in the Colorado /Gunnison, the Arkansas, and the South Platte. In recent decades, reservoir storage has been only part of the answer to water supply development. Water users also rely on direct flow diversions, transbasin imports, acquisition of irrigation rights, groundwater development, water reuse and coordinated operations with other providers as major components of their water supplies. Most of the water development projects currently being contemplated or underway involve combinations of these strategies. Basin level activities are described below, but the inclusion of specific projects should not be interpreted as endorsements. 1. Arkansas Basin In the Arkansas Basin, the Southeastern Colorado Water Conservancy District, Colorado Springs, a number of other in -basin municipal water providers and the City of Aurora are all examining a range of new storage projects, reservoir enlargements, re- operations of existing reservoirs and new raw water pipelines for water supply development purposes. The Southeastern District has sponsored a cooperative planning process for in -basin water users (the Preferred Storage Options Plan, or PSOP) to examine potential storage projects that could help meet municipal in -basin water supply needs and facilitate cooperative water - sharing arrangements between in -basin cities and farms. Options preliminarily selected in the PSOP include enlargements of Pueblo and Turquoise Reservoirs and re- operation of existing storage capacity in Pueblo Reservoir. In addition to participating in the PSOP, Colorado Springs is examining a range of water supply options of its own. Over 80% of Colorado Springs' water supply comes from transbasin sources and is therefore reusable. Most of Colorado Springs' reusable return flows accrue to Fountain Creek, which joins the Arkansas River within the City of Pueblo, downstream of Pueblo Reservoir. In addition, Colorado Springs has acquired a significant amount of irrigation rights from the lower Arkansas River. Colorado Springs is examining several storage and pipeline options for regulating and delivering its reusable return flows and irrigation rights to its service area for municipal use, either by exchange to its existing points of diversion in the upper Arkansas or by direct pipeline delivery. In addition to the storage options preliminarily selected in the PSOP, Colorado Springs is considering a new water delivery pipeline from Pueblo Reservoir to its service area, as well as new on- stream storage reservoirs in the Upper Arkansas basin. In the long term, a pump -back facility from Ruedi Reservoir into the upper Arkansas River may be considered. The City of Aurora has acquired major portions of the irrigation rights associated with the Rocky Ford Ditch and Colorado Canal. Aurora is examining several storage and pipeline options for maximizing the delivery of that water to its service area, either by upstream exchange to its existing point of diversion at the Otero Pump Station or by direct pipeline delivery. Aurora is considering new gravel pit storage below Fountain Creek, new reservoirs in the lower and upper Arkansas, and new pipelines directly from the Arkansas River to Aurora. So far, Aurora's water supply needs and planning efforts have not been included in or coordinated with the Southeastern 35