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<br /> <br />lJ02S3~ <br /> <br />Table 3.--Faators and rating ranges used in the pacific Southwest <br />Inter-Agency Committee method for estimating sediment <br />yields using terrain characteristics <br /> <br />Factor <br /> <br />Rat i ng <br />range <br /> <br />Surface geology------ <br /> <br />0-10 <br /> <br />Soils---------------- <br /> <br />0-10 <br /> <br />Cl imate-------------- <br /> <br />0-10 <br /> <br />Runoff--------------- <br /> <br />0-10 <br /> <br />Topography----------- <br /> <br />0-20 <br /> <br />Ground cover--------- <br /> <br />-10-10 <br /> <br />Land use------------- <br /> <br />-10-10 <br /> <br />Upland erosion------- <br /> <br />0-25 <br /> <br />Channei erosion and <br />sediment transport. <br /> <br />0-25 <br /> <br />[From Shown, 197D] <br /> <br />Main characteristics considered <br /> <br />Rock type. <br />Weathering. <br />Ha rdness . <br />Fracturing. <br /> <br />Texture. <br />Sa 11 n i ty . <br />Aggregation. <br />Caliche. <br />Shrink-swell. <br />Organic Matter. <br />Rockiness. <br /> <br />Storm frequency, Intensity, and duration. <br />Snow. <br />Freeze-thaw. <br /> <br />Volume per unit area. <br />Peak flow per unit area. <br /> <br />Steepness of upland slopes. <br />Relief. <br />Fan and flood-plain development. <br /> <br />Vegetation. <br />Li tter. <br />Rocks. <br />Understory development beneath trees. <br /> <br />Percentage cultivated. <br />Grazing intensity. <br />Logging. <br />Roads. <br /> <br />Rill sand gu 11 i es. <br />Lands 1 ides. <br />Wind deposits in channels. <br /> <br />Bank and bed erosion. <br />Flow depths. <br />Active headcuts. <br />Channel vegetation. <br /> <br />23 <br /> <br />1- '~ <br />