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e PART VI. FUTURE DEVELOPMENT This section of the report summarizes the project depletions and salt pickups used by the Colorado Rlver Simulation System (CRSS) to estimate the impacts of depletions and salt pickups caused by develop- ment at selected stations within the basin. Part VIII summarizes the results of the computer modeling. Table Aon pages 57 through 59 presents a summary of the estimated present and projected future depletion of water through the year 2010 for both the Upper and Lower Basins of the Colorado River. The projec- tions for the years 1983 through 2010 represent the best estimate by the Bureau of Reclamation of how water use will be developed over the next 30 years. The projections were made after consultation with individual States within the Colorado Basin; however, the projections adopted by Reclamation for planning purposes are not necessarily concurred with by the States. e Table B on page 60 lists the salt pickups used by the CRSS model for the calculation of salinities in the Upper Basin. The Lower Basin salinities. are calculated on a reach-by-reach basis using cumulative depletions and pickups, instead of on a project-by-project basis as in the Upper Basin, and are not listed. The salt pickups listed are the actual figures used in the model to calculate the salinity changes pro- jected by CRSS. Irrigation and transbasin diversions show salt gains and losses, respectively; other uses (municlpal, industrial, evapora- tion, mineral, etc.), with the exception of the Las Vegas Wash, show no gains in loading due to salt pickup. A. Upper Basin Depletions[13] Table A summarizes estimates of depletions due to the activities of man in the Upper Colorado River Basin. These estimates were made by the Bureau of Reclamation in consultation with the water resource agencies of the Upper Basin States and have been reviewed by the States. The values shown herein do not necessarily have the concurrence of the States. Estimates of use in 1983 were developed by updating depletions re- ported ln the Upper Colorado Region Comprehensive Framework Study pub- lished in June 1971. Projections of water use beyond 1983 were devel- oped from information supplied by State water resource agencies and from construction schedules of projects authorized for construction or al- ready under construction. e In Table A the entry under each State labeled '~vaporation, Storage Units" represents that State I s share of total evaporation from Flaming Gorge Reservoir, Lake Powell, and the Aspinall Unit Reservoirs which will be charged to that State when total Upper Basin water development is reached. This is provided for in Article V of the Upper Colorado River Basin Compact. 30