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<br />Footnotes Continued - AnnuJlized Adverse NED Effects <br /> <br />d. Underground barriers are a two inch wide concrete walls which ex [end into <br />the ground about five feet. Holes created by rodents often allo~ irrigation <br />water to flow uncontrolled and erode benches and ditches. Maintenance and <br />repair for underground barriers is very small. <br /> <br />e. Enduring Practices <br /> <br />Irrigation ditch lining S I <br />Irrigation land leveling 4 <br />Irrigation Systems - trickle <br />Underground barriers <br /> <br />Estimated average annual cost/acre S 5 <br /> <br /> <br />Large irrigation water turnout with <br />lift gate, energy dissipators in center <br />and erosion apron in foreground. <br /> <br />j <br /> <br />-27- <br />