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<br />in the Arkansas River basin in Colorado include: The minimum pool or perma- .
<br />nent pool is the pool below which water is not withdrawn. It can include a
<br />dead-storage pool below the elevation of the outlet works, or a recreation .
<br />pool, that is held at a certain level to provide scenic, fishing, boating, or
<br />other recreational opportunities. The minimum pool might be held at a certain
<br />level to enable delivery of water to a given required elevation. Above the
<br />permanent pool, is the active pool, where water can be regulated. The conser-
<br />vation pool is used to store water for later use. If the use is for irriga-
<br />tion, the conservation pool can be considered the irrigation pool; under other
<br />uses, it might be the power pool or the municipal pool. The flood-control
<br />pool (flood pool) is considered inviolate space, and it cannot be decreased
<br />during the economic life of the reservoir by sedimentation. Surcharge is
<br />water temporarily stored above the lip of the uncontrolled spillway, which
<br />helps decrease the peak of very large floods. Sediment pool is the space
<br />reserved for accumulation of sediment throughout the economic life of the
<br />reservoir, (usually 75 to 100 years). Because water surfaces of most on-
<br />stream reservoirs are constantly changing, the sediment is not deposited below
<br />a specific elevation; therefore, the top and bottom of the sediment pool are
<br />not defined by <.levation. The joint-use pool is a pool used for more than one
<br />purpose. For example, the joint-use pool in Trinidad Reservoir refers to the
<br />39,000 acre-foot sediment pool, which, before it is occupied by sediment depo-
<br />sition, will be used to regulate irrigation supplies. In Pueblo Reservoir,
<br />the joint-use pool refers to 66,000 acre-feet, which, between the dates of
<br />April 15 and October 31, is inviolate flood space; during the rest of the
<br />year, this space can be used to regulate irrigation supplies. Reservoir-space
<br />allocation is revised with sediment accumulation; thus, one might encounter
<br />such terms as initial, 50-year, and 100-year allocations.
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<br />riparian doctrine.--A form of water law that gives the owners of the land
<br />adjacent to the water course equal rights to the use of the water.
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<br />river call.--Under normal flow conditions, the Arkansas River call date is
<br />simply the decree date of the most junior diversion, drawing a part of its
<br />decreed rights from the Arkansas River. The date is determined by the
<br />Division Engineer in conjunction with Water Commissioners of water districts
<br />concerned, and affects diversions in Water Districts 10, 11, 12, 13, 14, IS,
<br />17 and 67. It is based on flows at the Portland, Pueblo, Avondale, and
<br />La Junta streamflow-gaging stations, and the decreed diversions in Water
<br />Districts 14 and 17. Advanced notice of increasing and decreasing river flow
<br />is provided by the Granite and Wellsville streamflow-gaging stations. Under
<br />certain conditions, two distinct call dates may exist: one for the river
<br />upstream from Pueblo, and a second for the river downstream from Pueblo. The
<br />date downstream will be later, because of substantial inflow or return flow to
<br />the river. The call date on tributaries is determined by both the river call
<br />and the flow in the specific tributary. For example, although the Arkansas
<br />River call may be 1882, an 1879 right on a certain tributary might not be able
<br />to divert, because all flow of that tributary is going to satisfy a 1875 right
<br />from the same stream. (Jim Kasic, Assistant Division Engineer, Division 2,
<br />oral commun., 1983.)
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<br />sediment pool.--See reservoir-space allocation.
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