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<br />related to TDS, and is the term most frequently used by irrigators to refer to <br />TDS; for most practical purposes, they are equivalent. Salinity is also <br />measured (indirectly) by specific conductivity. The average salinity of <br />Colorado River water as it enters the Grand Valley is at moderate levels for <br />irrigation purposes. <br /> <br />USGS data for the period of from 1975 to 1996 shows the mean of total <br />dissolved solids (salinity) in the Colorado River at the USGS gaging station <br />near Cameo at the head of the Valley to be about 500 mg/1, with a range of <br />values from 103 to 921 mg/l. Specific conductivity averaged 866 Uc/cm. <br />(See Table F-2, Appendix F). <br /> <br />The dissolved solids in the water in the government High1ine, Orchard Mesa, <br />and Grand Valley Canals are basically the same as the dissolved solids in the <br />Colorado River. The water has been used for irrigation purposes for over <br />100 years, with no long range adverse affects on the soil or crops. Water <br />with salinity concentrations of 1000 mg/l or less is generally considered <br />satisfactory for irrigating most crops. <br /> <br />IV-10 <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I, <br />I <br />t <br />I <br />I <br />