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. bJ\~:ramount of water diverted at the new location. A downstream exchange is most often referred to as being delivered using the stream system as conveyance, with an appropriate transit loss being assessed to the water being conveyed. The ability to make an exchange without injury is frequently called an EXCHANGE POTENTIAL or EXCHANGE CAPACITY. In general, an upstream exchange potential exists whenever the stream is alive and carries water throughout the reach under consideration, The longest exchange envisioned in the use of Amity's water is that which would be required to divert water from the upper Arkansas above Sa1ida, Colorado. In this exchange, water could be made available to the City of Aurora or the City of Colorado Springs through the jointly owned Homestake Project. An exchange such as this could be accomplished in steps, if necessary, whereby the first step would be to exchange water into Pueblo Reservoir and then, at a different time, exchange the water further upstream as the exchange potential exists. It may be possible to use John Martin Reservoir to facilitate this exchange, particularly with respect to Amity's Compact water, as well as the 50,000 acre feet of storage right which Amity can transfer from the Great Plains Reservoir to the John Martin Reservoir. . An additional long distance exchange could be executed under proper conditions allowing water to be diverted from Fountain C,eek at or near the Fountain-Colorado Springs metropolitan area. An exchange potential must exist throughout the Arkansas-Fountain reach for this exchange to work. Intermediate exchanges could be utilized to provide water to points of diversion such as the headgate of the Colorado Canal near Boone, Colorado. Given that Colorado Springs and Aurora are recent purchasers of a significant share of the Colorado Canal and the Lake Meredith system, and that they choose to build conveyance facilities from that location to the city, Amity water could be made available to Colorado Springs at that point, as well as Aurora. An exchange upstream to the Colorado Canal headgate may involve considerably less difficulty than an exchange further upstream. Another possibility to get Amity water to the Colorado Springs and Aurora systems would be to build a pipeline from the Fort Lyon Canal, the canal that delivers the storage right to the Great Plains Reservoir, and pipe that water across to Lake Meredith, a pipeline of less than 13 miles. This would not require any change of point of diversion. . Water users downstream of the Amity, such as those in the State of Kansas, could utilize Amity's water without injury quite simply by the direct delivery either through the Amity Canal itself, or a combination of the Amity Canal and the Arkansas River. Provisions would have to be made to provide historic return flows to the same reaches of the Arkansas that had historically enjoyed them from irrigation of Amity lands. -4-