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. PART VII. ~~ICIPATED EFFECTS OF ADDITIONAL DEVELOPMENTS ...... ~ C)1 r :.' In order to estimate the probable effect of the authorized or con- templated developments on the quality of water at certain points along the Colorado River, the developments have been generally listed in down- stream order. By following the flow and salts down the river the esti- mated effects of the development can be shown at the pertinent stations for the years 1980 and 2000. These results are tabulated in Table E for the new period of record used in this report. The table was computed on the basis of the 1941-74 average annual flow and total dissolved solids. An additional station, "Colorado River above Parker Dam," was included in the table for purposes of clarification and maintaining continuity in computations. It should be noted that future concentrations were estimated without consideration to possible future control measures. Salinity control measures are discussed separately in Part VIII. . The anticipated future conditions evaluated in Table E would result from the construction of both Federal and non-Federal developments. Pickup of dissolved solids from newly irrigated lands where comprehensive studies have not yet been made has been computed for two assumed conditions, zero and 2 tons per acre. The future increase in evaporation over average present evaporation, by the Colorado River Storage Reservoirs, was considered negligible and therefore not included in future depletions. Present evaporations are reflected in present modified conditions. Following is a discussion of the various projects including a brief description of the physical conditions for each development authorized or contemplated for authorization. It should be recognized that the acreages and depletions as listed could change with change of plans on some of the contemplated projects. The figures presented below and in Table D are those which were current at the time of writing this report. In addition to the developments listed, a number of smaller private industrial developments either under construction or contemplated will result in certain depletions and will have some effect on water quality. The effects of all upstream developments are carried on down to and including Imperial Dam. A. Description of Projects 1. Above Green River near Green River. Wyoming Seedskadee Project.--This multipurpose project is located adjacent to the Green River in southwestern wyoming. . 49