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Moffat, Marston and Foothills-but some is used for irrigation and industrial purposes, or is provided to local suppliers by contract. In addition to the primary goal, there are several other considerations, such as environmental enhancement and recreation, maximizing hydropower revenue, and minimizing treatment and distribution costs, In some instances, the collection system is used for flood reduction for local communities. All of these issues are important to effective operations. To enhance the dependability ofthe collection system, reservoir storage must be managed to provide space to capture spring runoff so that no reservoir spills water while another fails to fill, To attain these conditions, the water supply from all sources must be forecast or estimated, Construction projects, maintenance activities, water quality considerations, contractual obligations and numerous other factors also restrict how the collection system is operated. In most years, more water is available to the collection system during the runoff season than can be consumed or stored, However, during the winter months and in dry years, the available water from streams is less than the demand for water, so that water must be withdrawn from storage, Reusable and Non-Reusable Water All water delivered by Denver Water to its customers is classified as reusable or non- reusable. Whereas return flows of non-reusable water belong to downstream water rights and cannot be used a second time by Denver Water, return flows of reusable water can be used over and over again until that water is fully consumed, The main sources of reusable water in Denver Water's collection system are: · The Blue River, · Fraser River water diverted by the Meadow Creek system, the only reusable water associated with the Moffat Collection System. · Transferred agricultural water rights, Reusable water that is delivered by Denver Water is tracked until it returns to a stream as effluent from a wastewater treatment plant or by groundwater return flow as a result of lawn irrigation. The Metro Wastewater Reclamation District Plant and the Littleton- Englewood Wastewater Plant are the primary return flow points of Denver Water's reusable water. Denver Water currently reuses portions of these supplies thrQugh exchanges and transfers, which are described below. In the near future the recycling plant will rely on reusable effluent as its source of water, Reusable effluent would also be the primary water source for an indirect potable water project. Exchanges, Transfers and Substitutions In an exchange, reusable water is added to a stream at a downstream point to enable diversion ofthe same amount at an upstream location, In a transfer, water is released 10 C:\Documents and Settings\vyp\Local Settings\Temporary Internet Files\OLK 150\MoffatSystem I 00603 ,doc