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Glossary of CDSS Terms Abandonment The loss of a water right based on the coexistence of the intent not to use the right with actual nonuse of that water right. (Rice (1991)) Absolute Water Right A water right that has been perfected and placed to beneficial use. (Rice (1991)) See also conditional water right. Acre An area equal to 43,560 ft^2. Acre-Foot The volume of water required to cover 1 acre of land to a depth of 1 foot; 325,850 gallons or 1233.5 cubic meters. One acre-foot supplies a family of four for about one year. (Rice (1991)) Adjudication Ajudicial proceeding in which a priority is assigned to an appropriation and a decree issued defining the water right. (Rice (1991)) Administrative Procedures Proceedings before an officer of the executive branch of government as distinguished from proceedings before the judicial branch of government. (Rice (1991)) AOP Annual Operating Plan. The general term used to describe the 24 month plan prepared by the USBR indicating the projected operation of the Colorado River Reservoirs (AOP). AOP is also the name used for the Annual Operating Plan model being implemented for the CRDSS. This is a 24 month study model version of the CRSM. Appropriation The diversion of a certain portion of the waters of the state and the application of same to a beneficial use (under certain conditions an appropriation for instream flow or minimum lake level maintenance may be accomplished without the act of diversion and application to beneficial use). (Rice (1991)) ARC/INFO, Arclnfo ARC/INFO is a GIS designed by the Environmental Systems Research Institute. For more information [Click Here], or see bibliographic reference [ESRI (1992)]. ASCII American Standard Code for Information Interchange. A standard computer code used to facilitate the interchange of information among various types ofdata-processing equipment. The code defines the numerical representation of characters. Base Flow A base flow is similar to a natural flow; however, base flow is calculated by adding back only key diversions to the recorded stream gages. In other words, base flows are not truly natural flows in that "minor" diversions are left in the gage. Basin Rank A number used in Colorado by the state engineer in the tabulation of decreed water rights to indicate the relative standing of a decreed right with respect to all other decreed rights withing a water division. (Rice (1991)) Beneficial Use The use of that amount of water that is reasonable and appropriate under reasonable efficient practices to accomplish, without waste, the purpose for which the diversion is lawfully made and without limiting the generality of the foregoing, shall include impoundment of water for recreational purposes, including fishery or wildlife. (Rice (1991)) BESTS M Boyle Engineering STream Simulation Model (Boyle (1992)). BRM -Big River Model The basin simulation model used to perform water balance operations in the Colorado River Basin taking into consideration compact policy analysis. For the CRDSS, this is currently the CRSS.