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<br />002891 <br /> <br />b. Provide mitigation measures necessary to prevent increased sediment <br />yields from exceeding "threshold limits" (as determined by the "state <br />of the art" HYSED model, or by actual measurements) identified for <br />each fourth-order watershed. <br /> <br />c. In the season of disturbance, reduce to natural rate any erosion due <br />to management activity. Reduce sediment yields within one year of the <br />activity. Accomplish reductions through mitigation measures such as <br />waterbarring and revegetation, as needed. <br /> <br />C. Individual Benchmark Analysis <br /> <br />One purpose of the benchmark analysis is to estimate the maximum obtainable <br />level of each resource. They are single resource oriented; not multiple-use <br />oriented, which is the mission of the Forest Service. They serve only as <br />reference points within which decisions will be made. While each individual <br />output level can be reached, it would be impossible to produce all of the <br />maximum levels simultaneously. Benchmark analysis helps to define the joint <br />production relationships among resources on the Forest. Such resource <br />interactions define the true decision space open to land managers. The shape <br />of this space depends on the nature and direction of the interactions which <br />mold it. Benchmarks contain many environmental, economic, budgetary, and <br />practical problems which make them difficult to implement precisely. Benchmarks <br />can only be affected approximately. <br /> <br />I <br /> <br />Only timber volumes associated with the planning period (50 years) are <br />displayed in the following tables. At times, volume from certain species <br />groups do not come into solution until late in the planning horizon. It does <br />not mean that these stands cannot be harvested now. It means the optimum point <br />of harvest is not within the first five decades given the purposes of the <br />benchmark. These stands can still be efficient. The analysis indicates the <br />stands are still growing, possibly beyond the point of culmination of mean <br />annual increment (CMAI). The stands are continuing to put on growth faster <br />than the discount rate of 4 percent. <br /> <br />Water yields displayed in the following Benchmark tables are incremental to <br />baseline. <br /> <br />Yield relationships were identified for three non timber multiple use benefits <br />(outputs) and these were were analyzed in FORPLAN. The analysis has the option <br />to use either timber harvests or noncommercial methods to achieve the <br />benefits. These outputs are: <br />- winter range elk, deer and associated hunting RVD's <br />- domestic livestock AUM's <br />- water yield <br /> <br />23 <br />