PERMFILE120949 - Laserfiche WebLink

Home Browse Search

Depth [o a Selected Soil Restrictive Layer Rating Bollish Pit Tables -Depth to a Selected Soil Restrictive Layer Summary by Map Unit -Logan County, Colorado Soil Survey Map Unit Name Rating (centimeters) Total Area Map Acres in Unit Symbol AOI 1r3 %:I7iatlUtvaa complex Null 28.3 ;: < "910 2~ pepttitt ,,: ,:Y., , ., 108 Stoneham-Cushman 56 0.1 complex, 3 to 9 percent slopes 109 Thedalund-Kim= 25 . I0.3 .,Shingle cotuplex, 9 to 20 pedceat slopes 1 18 Wages loam, 0 to 3 Null 8.0 percent slopes RFGEIVED FEB 1 6 2001 Percent of AOI Dtvtsion of Reclamation, Mining and Safety 60:Z .; 0.1 22.0 17.1 Description -Depth to a Selected Soil Restrictive Layer A "restrictive layei' is a nearly continuous layer that has one or more physical, chemical, or thermal properties that significantly impede [he movement of water and air through the soil or that restricts roots or otherwise provides an unfavorable root environment. Examples are bedrock, cemented layers, dense layers, and frozen layers. This theme presents the depth m the user selected type of restrictive layer as described in the underlying database for each map unit. If no restrictive layer is described in a map unit, it is represented by the "> 200" depth class. In [he underlying database, this attribute is actually recorded as three separate values. A low value and a high value indicate the range of [his attribute for the corresponding component. A "representative" value indicates the expected value of this attribute for the corresponding component. For this soil property, only the representative value is used. Parameter Summary -Depth to a Selected Soil Restrictive Layer Units of Measure: centimeters Restriction Kind: Bedrock (paralithic) Aggregation Method: All Components Aggregation is the process by which a set of component attribute values is reduced to a single value that represents the map unit as a whole. 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 fast step of the aggregation process is to derive one attribute value for each of a map unit's components. From this set 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 corresponding 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 "AIL Components' returns the lowest or highest attribute value among all components of the map unit, depending on the corresponding "tie-break" rule. In this case, the "tie-break" rule indicates whether the lowest or highest usrw Namt Bnaaecey web Soil Survey 1.1 10/11/2006 "~ rmm~.rioo s.,.~ National Cooperntive $oa Survey Aege t oC 2