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Custom Soil Resource Report <br />Components whose percent composition is below the cutoff value will not be <br />considered. If no cutoff value is specified, all components in the database will be <br />considered. The data for some contrasting soils of minor extent may not be in the <br />database, and therefore are not considered. <br />Tie -break Rule: Higher <br />The tie -break rule indicates which value should be selected from a set of multiple <br />candidate values, or which value should be selected in the event of a percent <br />composition tie. <br />Interpret Nulls as Zero: No <br />This option indicates if a null value for a component should be converted to zero before <br />aggregation occurs. This will be done only if a map unit has at least one component <br />where this value is not null. <br />Layer Options: All Layers <br />For an attribute of a soil horizon, a depth qualification must be specified. In most cases <br />it is probably most appropriate to specify a fixed depth range, either in centimeters or <br />inches. The Bottom Depth must be greater than the Top Depth, and the Top Depth <br />can be greater than zero. The choice of "inches" or "centimeters" only applies to the <br />depth of soil to be evaluated. It has no influence on the units of measure the data are <br />presented in. <br />When "Surface Layer' is specified as the depth qualifier, only the surface layer or <br />horizon is considered when deriving a value for a component, but keep in mind that <br />the thickness of the surface layer varies from component to component. <br />When "All Layers" is specified as the depth qualifier, all layers recorded for a <br />component are considered when deriving the value for that component. <br />Whenever more than one layer or horizon is considered when deriving a value for a <br />component, and the attribute being aggregated is a numeric attribute, a weighted <br />average value is returned, where the weighting factor is the layer or horizon thickness. <br />Water Features <br />Water Features include ponding frequency, flooding frequency, and depth to water <br />table. <br />Depth to Water Table <br />"Water table" refers to a saturated zone in the soil. It occurs during specified months. <br />Estimates of the upper limit are based mainly on observations of the water table at <br />selected sites and on evidence of a saturated zone, namely grayish colors <br />(redoximorphic features) in the soil. A saturated zone that lasts for less than a month <br />is not considered a water table. <br />This attribute is actually recorded as three separate values in the database. A low <br />value and a high value indicate the range of this attribute for the soil component. A <br />27 <br />