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<br />UUUJJ\) <br /> <br />Draft - Do Not Cite <br /> <br />11 <br /> <br />August 2003 <br /> <br />Flows for the other five scenarios were calculated with the RiverWare computer model ~ <br />by the Reclamation office in Grand JlIDCtiOn, Colorado. For the Reclamation and Western <br />scenarios, flows at the Delta and Grand JlIDction gages were predicted using scenario-based <br />hypothetical dam releases at the Aspinall Unit and historical flow information for diversions and <br />inflow from tributaries. RiverWare is a generalized river basin modeling system that integrates <br />multipurpose aspects of reservoir systems, such as flood control, navigation, recreation, water <br />supply, and water quality, with power system economics. RiverWare was developed by the <br />Center for Advanced Decision Support for Water and, Environmental Systems (CADSWES) at <br />the University of Colorado in Boulder, Colorado (CADSWES 2003). <br /> <br />2.3 SEDIMENT-TRANSPORT MODELING <br /> <br />In addition to water and dissolved constituents, solids are conveyed by water flowing in <br />natural and artificial channels. Regardless of their origin, these solids are referred to collectively <br />as sediment. (Kiado 1978). The movement of the sediment downstream is termed sediment <br />transport. Although sediment transport is often used to refer to only the movement of fine <br />materials, such as silt or sand, sediment transport also encompasses the movement of gravels and <br />more coarse material (e.g., boulders) in flowing water (Henderson 1966). Over periods of <br />geological times, rivers are very effective erosional and depositional agents that are responsible <br />for major landscape modification, including cut and fill (Hey 1987). <br /> <br />A distinction is often made between a number of possible forms of sediment transport. <br />These forms include sp8yended load, bed load, and wash 10a9- The most common form of <br />sediment transport is suspended load. For suspended load, solid particles derived from the <br />bottom of the channel are maintained in suspension by the turbulence of the flowing water <br />(Henderson 1966). For bed load, transported material rolls or slides along the bed of the channel, <br />with occasional jumps into the mainstream The movement of the particles can be intermittent <br />The material in bed load is consistent with material present in the bottom of the channel. Wash <br />load refers to the movement of very fine particles (e.g., clays, silts, and abrasion products) <br />transported by water; these particles, in general, do not originate from the bed. Total sediment <br />load for a system is the sum of all three general forms of load. Depending on specific local <br />