RM of Westbourne Bulletin 99-36 - Agriculture and Agri-Food Canada
RM of Westbourne Bulletin 99-36 - Agriculture and Agri-Food Canada
RM of Westbourne Bulletin 99-36 - Agriculture and Agri-Food Canada
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Page 22 Information <strong>Bulletin</strong> <strong>99</strong>-<strong>36</strong> Rural Municipality <strong>of</strong> <strong>Westbourne</strong>Water Erosion Risk Map.The risk <strong>of</strong> water erosion was estimated using the universal soil lossequation (USLE) developed by Wischmeier <strong>and</strong> Smith (1965). TheUSLE predicted soil loss (tons/hectare/year) is calculated for eachsoil component in each soil map polygon. Erosion risk classes areassigned based on the weighted average soil loss for each mappolygon. Water erosion risk factors include mean annual rainfall,average <strong>and</strong> maximum rainfall intensity, slope length, slopegradient, vegetation cover, management practices, <strong>and</strong> soilerodibility. The map shows 5 classes <strong>of</strong> soil erosion risk based onbare unprotected soil:negligiblelowmoderatehighsevereCropping <strong>and</strong> residue management practices will significantlyreduce this risk depending on crop rotation program, soil type, <strong>and</strong>l<strong>and</strong>scape features.Table 8. Water Erosion Risk 1Class Area Percent(ha)<strong>of</strong> <strong>RM</strong>Negligible 51670 39.5Low 33817 25.8Moderate 43932 33.6High 92 0.1Severe 646 0.5Unclassified 148 0.1Water 586 0.4Total 130891 100.01 Based on the weighted average USLE predicted soil loss within eachpolygon, assuming a bare unprotected soil.
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