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<br /> <br />00l78~ <br />2513.31--2 <br /> <br />B. <br /> <br />TITLE 2500 - WATERSHED MANAGEMENT <br /> <br />Physical condition of the burned area. <br /> <br />1. Aspect (relative to usual storm movement). <br /> <br />2. Topogra~hy: steepness of slopes, channel gradients. <br /> <br />3. Geology: slope of rock formations as related to surface <br />slopes, permeability, stability. <br /> <br />4. Soils: general structure, depth, stability, erodibility. <br /> <br />5. Original cover, amount of debris remaining as related to <br />its effectiveness in holding soil and retarding runoff. <br /> <br />/ <br /> <br />6. Channel debris loads, amount of additional debris that may <br />move down to channels. <br /> <br />~ <br /> <br />C. Flood factors. <br /> <br />D. <br /> <br />1. Channel conditions. <br /> <br />a. Capacity. <br /> <br />b. Restrictions and obstructions; encroachment. <br /> <br />c. Controls: dams, dikes, floodways, etc. <br /> <br />2. Climate. (Hydrologic appraisalJ~ <br /> <br />a. Storm magnitude and duration expected on a 10-year <br />frequency. (Total storm rainfall). <br /> <br />b. Rainfall intensities (maximum daily and hourly) <br />expected on a 10-year frequency. <br /> <br />c. Probable antecedent soil moisture (as priming for a <br />flood) . <br /> <br />Developments subject to hazard of flood and $ediment deposition <br />damage, their value and significance; <br /> <br />1. Transportation systems. <br /> <br />a. Roads and highways. <br /> <br />b. Railroads. <br /> <br />J1Jl)e 1975 <br />~-2 &l~~lement No. 31 <br /> <br />Forest Service Manual <br /> <br />" <br /> <br />e <br /> <br />e <br /> <br />e <br /> <br />e <br /> <br />e <br />