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I t I <:) 0') ~ ..... . I I ,I . m - ~ ti - ~ , It v It ti ti u .' n -216- located on Mancos shale derived soils, and, if the 15 Mgm/ha loading were attributed to the rest of these lands, the total salt load would approach the commonly estimated 1.0 x 106 Mgm/yr contribution. PL 93-320 authorized the "Lower Gunnison" as irrigation salinity source control planning unit, and did not specify any measures or only the Uncompahgre River portion of the Lower Gunnison in the language of the Act. Tables 2-5 and 2-6 describe the canal and lateral systems in the Lower Gunnison. Table 2-7 presents the canal optimization parameters for the Lower Gunnison canals. Salinity Control-- The Regional 208 Water Quality Plan (Colorado Depart- ment of Local Affairs, 1979) urges that the total region be evaluated in a salinity control program and that dollars should be spent where the greatest effects can be obtained. Improved water conveyance, distribution, application and removal systems will be required for any agricultural salin- ity control program. This would also include irrigation scheduling services in conjunction with the other on-farm improvements. Two major salinity efforts presently being conducted in the Lower Gunnison area are being done by the USDA, Soil Conservation Service (SCS) and the U.S. Department of the Interior, Water and Power Resources Services (WPRS). The WPRS has established an extensive surface and subsurface monitoring program in the Uncompahgre Valley and a surface water quality program in the rest of the Lower Gunnison. i.