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~ ~ .,L', . <br />i. .. I. <br />.Y '* <br />y. i <br />' M ,• _ri~f ~ 1 ~ ,`~~ ` ~~ , ~ Y,I ~ 7~(•y~C {!Z .T~ l [~~1py'~i~ <br />Figure 2 -Portal area. Shrubs in lower part of photo have developed in depressions that were <br />created during regrading for moisture retention. Green standpipe in right side of photo is a <br />piezometer. <br />Although the sample data indicate species diversity was lo~v, it is evident that the grasses, torhs, and <br />shruhs on the site are a self=sustaining mix of vegetation that provides long-term erosional stahility. <br />The mosaic of shrub clusters and open grass land on the site provides interspersed areas of ~vildlite <br />cover and forage. <br />f;'ro.~•inn ('onn•u! C!l1LI ,Sedinre-1l 1''icld <br />The vegetative cover on reclaimed areas appears to be preventing rill and gully formation. Uuring <br />the bond release inspection and recent inspections. hillslopes did not show signiticantdown-cutting <br />from concentrated flow, even on the steepest slopes. No delta or sediment tans have been found on <br />the site during recent inspections. <br />Using the observed cover values in the Universal Sail Loss 1Jquation, the calculated soil loss rate is <br />?.9 tons/acre/year, calculated as: 40k X 0.30; X i.Q~ s X U.08~.~ X l .U~~ = 2.9 tons/acre/year. •I~he <br />(.!SI.F, is the product of the following five factors: rainfall-runott~(R), soil erodibility (h), slope- <br />length-steepness (I,S), cover-management (C), and erosion control practice (I'). 'l'he calculated soil <br />loss rate of ?.9 tons/acre!year is a moderate soil loss rate for steep-sloped rangeland in southwest <br />Colorado, and indicates the cover is adequate for erosion control. Sediment yield can be expected to <br />he similar to yield tom surrounding undisturbed lands. <br />