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Representative Slope Rating Bollish Pit Tables -Representative Slope RECEIVED Summary by Map Unit -Logan County, Colorado FEB 16 2001 Soil Survey Map Unit Name Rating (percent) Total Acres Percent of AOI Division of Kectamation, Area Map Unit in AOI Mining and Safety Symbol 24 But Allf~ complex, 9 `r20A" - 28 3 60.7i: r ;#ir275 paceut!slopas, 108 Stoneham-Cushman 6.0 0.1 0.1 complex, 3 to 9 percent slopes 109' ~~ , ^ 'thedalnudRIsrim-Shingle ~ 15:0 ' ..~ `- 10.3 22,0 comgilex, Ato'-20 ~p~rceitt slope's 118 Wages loam, 0 w 3 2.0 8.0 17.1 percent slopes Description -Representative Slope Slope gradient is the difference in elevation between two points, expressed as a percentage of the distance between those points. In the underlying database, this at[dbute is actually recorded as three sepazate values. A low value and a high value indicate [he range of this attribute for the corresponding component. A "representative" value indicates the expected value of this atribute for [he coreesponding component. For [his soil property, only the representative value is used. Parameter Summary -Representative Slope Units of Measure: percent Aggregation Method: All Components Aggregation is the process by which a set of component attribute values is reduced w a single value that represents the map unit as awhole. - A map unit is typically composed of one or more "components". A component is either some type of soil or some nonsoil entity, e.g., rock outcrop. For the attribute being aggregated, the first step of the aggregation process is to derive one attribute value for each of a map unit's components. From this se[ of component attributes, the next step of the aggregation process derives a single value that represents the map unit as a whole. Once a single value for each map unit is derived, a thematic map for soil map units can be rendered. Aggregation must be done because, on any soil map, map units are delineated but components are not. For each of a map unit's components, a corresponding percent composition is recorded. A percent composition of 60 indicates that the cortesponding component typically makes up approximately 60% of the map unit. Percent composition is a critical factor in some, but not all, aggregation methods. The aggregation method "All Components" rewms the lowest or highest attribute value among all components of the map unit, depending on the cortesponding "tie-break" rule. In this case, the "tie-break" rule indicates whether the lowest or highest value among all components should be returned. For this aggregation method, percent composition ties cannot occur. The result retluned by this aggregation method represents either the minimum or maximum value of the corresponding attribute throughout the map unit. The result may well be based on a map unit component of very minor extent. Component Percent Cuwff USQ4 Nxmal iewor~n Web Soil Survey I.I 10/112006 rmm~lbuSmk< National Cooperative Soil Survey Page l of 2