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from an upstream reservoir so it can be stored in a downstream reservoir or delivered to a water treatment plant. Exchanges increase the amount of water that can be legally diverted at an upstream location. Exchanges that would injure a water right between the replacement and diversion point cannot be performed. The major source of replacement water for Denver's exchanges is the reusable water returning to the South Platte as effluent from the Metro Reclamation District and the Littleton-Englewood wastewater treatment plants. Exchanges and transfers give Denver Water the ability to move water from place to place within the collection system. For example, if operators want to store water in Dillon Reservoir when such storage is out-of-priority, they can perform a Williams Fork Reservoir-to-Dillon Reservoir water exchange, The exchange would be accomplished by releasing water out of Williams Fork Reservoir for use by downstream senior water rights and storing a like amount of water in Dillon Reservoir. An example of a transfer is the conveyance of water from Gross Reservoir to Ralston Reservoir to meet water needs at the Moffat Water Treatment Plant, Some of the exchanges commonly performed within the collection system are listed below: · Metro Wastewater Treatment Plant to Strontia Springs Reservoir, · Bi-City Wastewater Treatment Plant to Strontia Springs Reservoir. · Williams Fork Reservoir to Dillon Reservoir, · Williams Fork Reservoir to Moffat Tunnel. · Chatfield Reservoir to Cheesman Reservoir. · Blue River water to Cheesman Reservoir. Denver Water and South Adams County Water and Sanitation District have jointly acquired gravel pit sites along the South Platte River in Adams County, The pits will be converted to storage facilities and used to maximize exchange of reusable water upstream to Denver Water's facilities. Another important operation that is similar to an exchange is a substitution, where water is released from one source in place of another supply. While exchanges are instantaneous, there is a time delay for substitutions. Releases from Williams Fork Reservoir can be made in substitution for releases from Green Mountain Reservoir, a Bureau of Reclamation reservoir. This operation allows Denver Water to fill Dillon Reservoir which is located upstream of Green Mountain Reservoir and has junior water rights to Green Mountain, using water that Green Mountain was entitled to store. This operation can be conducted because Green Mountain Reservoir will usually fill from the water supplies that enter the Blue River between Dillon and Green Mountain reservoirs. If Green Mountain Reservoir fails to fill, water supplies from the Williams Fork Reservoir are released (substituted) to downstream water demands in place of releases from Green Mountain Reservoir. 11 C:\Documents and Settings\vyp\Local Settings\Temporary Internet Files\OLK 150IMoffatSystem 1 00603.doc