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<br />Project Lands <br /> <br />addition, however, small quantities of foreign runoff will. be <br />contributed from minor, natural drainageways originating in the <br />uplands and crossing the service area. These drainageways have <br />well entrenched and stabilized channels with adequate capacity <br />to protect all irrigable lands from cross drainage flooding, <br /> <br />In the past the irrigable lands in the low bottoms have been <br />flooded occasionally from the river. Trinidad Dam and Reservoir <br />will furnish flood protection for these lands under the "with" <br />project condition. <br /> <br />Eltcept 1'or very minor acreages, all irrigable lands have <br />sufficient slope to permit the escape 01' excess sur1'ace ,waters. <br />Moreover, there are sufficient outlets.for the surface runoff <br />to enter the natural drains which, as mentioned previously, are <br />adequate to convey the surface waters to the river. Because of <br />these favorable conditions, no plans have been made for project <br />works to improve surface drainage. <br /> <br />.'.1 <br />"1 <br /> <br />Subsurface Drainage <br /> <br />The land classification survey included determinations 01' <br />subsurface conditions in the project area, Borings to depths of <br />five feet confirmed that subsurface drainage, although somewhat <br />restricted in Some areas, is adequate for sustained irrigation <br />on all lands classed as irrigable. To confirm that the soil <br />substrata have satisfactory hydraulic conductivity, samples from <br />lO-foot borings taken in representative areas were tested in the <br />laboratory. <br /> <br /> <br />Since irrigation has been practiced in the area for many <br />years, the present water table levels are fairly stable, In <br />future "with" project operations no changes in subsurface drainage <br />conditions are expected to develop which would adversely affect the <br />irrigabili ty of the lands. The :princi:pal change in the irrigation <br />practices resulting from the :project will be to distribute the <br />water deliveries more evenly throughout the irrigation season. <br />This change will not significantly disrupt the existing stabilized <br />conditions, and sustained irrigation can continue to be practiced <br />on the irrigable lands, <br /> <br />-. ",; <br /> <br />32 <br />