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Considera tion of Task Force' s Estimate <br /> The Emerald Canal Feasibility Task Force' s final report estimated the <br /> Emerald Canal costs as $22,103,000 for aarrecreational channel adapted�to <br /> handle flood flows from Amazon Creek. This estimate includes costs that were <br /> not considered in the technical appendix estimate for the diversion channel. <br /> Additional costs included were for diversion of flow from the Willamette River <br /> to the millrace, for modifications to Amazon Creek, for park and recreation <br /> facilities, and for relocation of utilities. <br /> Using the Task Force' s estimate for lands and damages and for relocations <br /> of utilities as a starting point, a cost of $26,921,000 was developed for the <br /> diversion channel from Amazon Creek to the Willamette River. Of this amount, <br /> $12,000,000 is for lands and damages and $7,000,000 is for relocation of <br /> utilities. To amortize the total of $19,000,000 for these two costs would <br /> take $1,616,000 per year. <br /> With average annual flood control benefits of $373,000 per year the <br /> benefit-to-cost ratio is 0.23 with construction cost omitted. Including <br /> construction costs would produce a benefit-to-cost ration to 0.16. <br /> Because the origin of portions of the Task Force's estimate was unavail- <br /> able, no attempt was made to revise the technical appendix estimate to include <br /> utilities relocation or revised lands and damages costs. Also, without these <br /> costs, the benefit-to-cost ratio was considerably below unity. <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> Conclusions <br /> As a result of this reconnaissance study, the following conclusions can be <br /> drawn: <br /> 100-year flood event for Amazon Creek is equivalent to 2,300 cfs of <br /> IIflow at the downstream end of the existing concrete-lined channel in the <br /> creek. <br /> 16 <br />