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~1 ~, , k'" ''') c,...:. 00 4. SALT BUDGETS a. Salt Contribution: It is esi,mated that about 600,000 tons of salt is contributed annually to the Colorado River through deep percolation and seepage. Salt contribution fr'om each of the monitored site is provided in Table 7. The total amount of salt entering into the Co'lorado River System from all the monitored sites is estimated at just over 1800 tons for 1991 or about 5.2 tons of salt per acre. Salt factor per acre inch of deep percolation ~a$ based, on the hydrosa Ii n i ty mode I deve loped fo r the different cana I systems; see Appendix F. The amount of deep percolation times the salt factor per acre inch provides salt load per acre. The salt load per acre times the acreage gives the total salt contribution to the Colorado System from the site. b. Reduction in Deep Percolation and Seepage: Deep percolation and seepage could be reduce'd substan1:ially ~ith installation of improved irrigation systems and better water management. Initial SCS estimates indicate that ~ith on-farm irrigation system improvements about 130,000 tons of salt could be r'educed annuall,y by project end. ~~.~}.~* ";;:'.' In 1991, about 58,999 feet of, underground pipel ine ~ere installed on- farm and 4,458 feet off-far~: Also, about 10,09 feet of concrete ditches and 44', 814 feet of ,gated pipe ~ere i nsta II ed. ,Improved surface and sprinkler irr'iga,tion systems ~e,re 'also installed. See CRSC project status report sect i on I.6. Insta II at i on of improved systems resulted in reduction of deep percolation, seepage and salt load through FY 91, as fo II ows: On-farm Off-farm 1991 Cumulative 1095 8174 53 4946 1148 13120 10908 31914 20783 18285 31661 50199 Seepage/deep perc. reduction (ac. ft.) On-farm Off-farm Salt Reduction (tons) . 27