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<br />. <br /> <br />002030 <br /> <br />_. <br />~;, <br /> <br />Conclusions <br /> <br />Test results indicate low rates of seepage for both the Hogback <br />and Upper Fruitland Canals in the Shiprock area. Observation <br />wells installed next to the ponding test sites also support this <br />conclusion in that they were either dry or the water levels in <br />them did not change during the test period. These seepage rates <br />are similar to those of 0.07 ft3/ft2/day as estimated by <br />Reclamation for concrete lined canals with good joint fillers. <br />They are very low when compared to Reclamation estimates of <br />seepage rates for canals constructed in materials of various <br />types as listed below. <br /> <br />Canal in clay and clay loam 0.41 ft3/ft2/day <br />Canal in volcanic ash 0.68 ft3/ft2/day <br />Canal in sand and volcanic ash 1. 20 ft3/ft2/day <br />Canal in sand and gravelly sand 2.20 ft'/ft2/day <br />. <br /> <br />. <br /> <br />Test results also indicate that seepage rates do not vary greatly <br />from site to site. It is likely that silt being transported into <br />the canals from the San Juan River is a major factor in these low <br />seepage rates. This may be especially true during periods of <br />high run off. <br /> <br />Based on these test results, these canals should not be major <br />contributors of salinity to the San Juan River. <br /> <br />8 <br />