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<br />Agricultural costs can be measured bY'crop yield reduction, high leaching
<br />requirements which often !'ecessitate costJ,y subsurface c1ra:(.nage ~ystems,
<br />special tillage practicasand higher labor cost.s (Anclerson and .Kleinnsn;1978;
<br />Robinson et al., 1976; ancl Moore et a1. ,'1974). The soils ancl soil structure
<br />also can be severely damaged by excess salinity requiring many years to be
<br />reclaimed. Moore (1972) presente an inteTesting c1isoourse .on the neoessary
<br />and sufficient oonclitions for long-term agrioulture. ptimarilyrelated to
<br />sal:l:n:tty. Moore e.t a1., (1974b) have developed orop production functions
<br />relat~ng . quality anll eupplY of "Water in the Colorado River :Basin. . Kleinman
<br />et al. (1974) and Kleinman snd:Brown (1977) diseuss the damages. to agricul-
<br />tural production by salinity in the UCRB. .
<br />
<br />
<br />The Soil, Coneervation estimates the total municipal damages in the Lower
<br />.Colorado River Baein chenge at sn snnusl rata of~291,200 per mg/1 change .in
<br />saltcon.centration. Agricultural damagesiMrellse $124 ,800snnually peT mg/l
<br />(USDA, SCS, 1979b).
<br />
<br />The USDI, WPRS (1980a) is preser>tlyusinga total annual c1amage f:tgure of
<br />$447,700 per mg/l incr.ease at: Imperial Dam (January 1, 1980 prices) for the
<br />.range of concent:rations expected in the next' 20 years. (e2S-1225mg/l). These
<br />c1amage values do not consider costs passed into the Mexican use sector or the
<br />value of good inteTnatione1. relationeh:lps; Oyarzllbal-Tamargo and Young (1976)
<br />presented preliminsry damage estimstes at $5 million per year in 1.975.
<br />
<br />Public Law 9J~320
<br />
<br />,Water reso.urce development as well as all of the associated water demartlls.
<br />of elletgy development.oan potentially incres,se the salinity in the Colorado
<br />Rivet. The purpose of Public Law 93-320 (Colorado River Basin Salinity
<br />Control Act, June 24, 1974) is to mitigate salinity,increases causecl by the
<br />incliVidual Colorado River Basin states in developing their respective .sllow-
<br />ances of water from the Colorado River. Title II of PI. 93-320 (Section 207)
<br />sp.,cific;ally statu .that"nothing in this title shall be construed to altar,
<br />amencl, repeal, modify ,interpret, or be in confliot w:lth the provisions of the
<br />Colorado River Compact (45 Stat., 1957), the Upper Colorado River Basin Com-
<br />pect (63 Stat., 31) . . .," or any othercompaot or agreement and/or eny
<br />proj,ec;t which allocatee the Colorado River ss to quantity:
<br />
<br />P,L93-320,TitleII direets,the Sec;retaTY of .the Interior to inveotig/ilte,
<br />plan and implement: a saUnity oontrol program in the Upper Coloracl'o'R1ve'r
<br />'. .",BllS.:l,l,l.,. Cooperat~,on and coordination ..by theSecTetary of, Agrioulture and the
<br />U. S. llnvirol11llental Protection Agency we;re also requirecl.. The le.gilillation
<br />authorized four projects for c;onatruction: (1) Grsnd Velley, Colorado; (2)
<br />.Paradox Valley, Colorado,; (3) ,Crystal. Geyser, ,Utah;'ancl(4J LaS,V"'llas ,wash,..
<br />Nevad.a. Twelve othar projeots above Imperial Dam were iclentif:tedfor. .further
<br />study.
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<br />The Lo"Wer Gunnison, Uintah :Basin, Colorado Indian Reservation. ancl the
<br />Palo Vercle Irrigation District were specifically iclentified as "irrigation
<br />source control programs." Point sources were iclentified as La Verkin Springs.
<br />Littlefielcl Springs, and Glenwood-Dotsero Springs. Other diffuse sources
<br />mentionecl in the legislation which shoulcl also be investigated were Price
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