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green water.--A local term for water released ring to the absence of sediment in the water. lot of algae. from a major reservoir, refer- Also, reservoir water with a . headgate.--The point on the stream at which water is diverted. A headgate can be a simple board structure on the stream bank, or a complex hydraulic struc- ture consisting of radial gates and many other devices. in priority.--See priority system. inviolate space.--Inviolate reservoir storage space refers to space allocated to a single purpose, usually flood control, which cannot be infringed on for other uses, not even sediment accumulation. To keep the space inviolate, the elevation of the top and bottom of the various pools must be redefined periodically. For this purpose, reservoir-sedimentation surveys are conducted after set periods of ~ime, and after major floods. :: irrigation pool.--See reservoir-space allocation. joint-use pool.--See reservoir-space allocation. junior right.--A relative term describing a water right with a priority less than that of a "senior right." In general use in the Arkansas River basin, junior rights refer to those water rights seldom in priority; senior rights refer to those water rights usually in priority. made whole.--To leave the river in the condition it would have been had the . exchange, reservoir release, or other action not taken place. (Robert Jesse, Colorado Water Division 2 Engineer, written commun., August 23, 1984.) native water.--As used in this report, water naturally occurring in the basin in which it is found; not imported from outside the basin. :.; , Jj off-stream reservoir (off-channel reservoir).--A surface-water storage reser- voir located outside the channel of the stream that constitutes the principal source of the water stored in the reservoir. Off-stream storage is supplied by a ditch or conduit, with the headgate located on a stream other than that in which the reservoir is situated. Those off-stream reservoirs located in the channel of a tributary might store minor quantities of the waters of that tributary as well. Like other reservoirs in Colorado, a storage right is required that describes the source, quantity, use, and priority of all water stored. on-stream reservoir (on-channel reservoir).--An on-stream reservoir derives most of the water stored from the stream on which the reservoir is located. A storage right is required. penciled out.--A local term used to describe the transfer of water from the "compact pool" (conservation pool) to the "agreement pool" (accounts) in John Hartin Reservoir. See Arkansas River Compact section. penstock.--The conduit that conveys water under pressure to the turbines of a. hydroelectric powerplant. viii