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<br />OJIG48 <br /> <br />e <br /> <br />San Juan River Channel Protection Estimates for Continuous Operation at Peak Flows <br />Above 5,000 cfs Between Navajo Dam and the Confluence of the Animas River <br /> <br />Specific Areas of Protection <br /> <br />Estimated Cost $ <br /> <br />e <br /> <br />1. Bank protection from the dam to Farmington assumed <br />to be needed for 20% of the channel. This is based on the <br />observation made at 5,000cfs flows. <br />*40 miles x 2 sides of the channel = 80 miles x .20 = 16 miles <br />*requirements for protection will vary and the methods assumed were <br />-diking <br />-channel armoring <br />-protective vegetation <br />-purchase flood easement <br />* a cost estimate was based on 8 miles of flood easement and 8 miles <br />of armoring. <br />-easement assumed to be 1000 feet from the channel bank for <br />8 miles which requires 970 acres. At $2,000 /acre an assumed <br />value which could be negotiated with the land owner. This would <br />cost approximately $2,000,000. $2,000,000 <br />-armoring was assumed to require 7 foot of channel protection <br />and 3 feet of over bank protection. A 3 foot thick cobble layer was <br />estimated. This is 30ft3/foot of channel length of 8 miles which <br />which requires 47,000yd3 of cobble. It was assumed the cobble <br />would be quarried, hauled on site and placed at $200/yd3 which <br />has an estimated cost of$9,400,000. $9,400,000 <br /> <br />2. Septic Systems - it was estimated that approximately 40 systems <br />would be flooded or caused to be inoperable due to the <br />high water level. At a projected cost to replace them at <br />$5,000 per system this comes to $200,000 <br /> <br />$200,000 <br /> <br />3. Canal Structures <br />Turley Manzanares Ditch was assumed to be rebuilt for <br />the test, therefore no cost in this stage <br /> <br />Citizens Ditch will withstand a test high flow but continued <br />annual high flows will require some level of protection. <br />The work was assumed to duplicate the work on the <br />Turley-Manzaneres Ditch of $500,000 <br /> <br />$500,000 <br /> <br />e <br />