Data Layers . Web Maps . Contact Info . The attributes required for this example are in the mapunit , comp , and layer tables.
Analysis begins at the layer table that is at the lowest level in the schema.
The results of the data aggregation are moved to the comp table, for map analysis purposes. The available water capacity is calculated for the entire profile as total inches of water. The laydepl and the laydeph are the low and high values of the range for the layer depth reported in inches. The awcl and awch columns contain the low and high values the available water capacity reported in inches of water per inch of soil. The column, wtavg in example 1, was added to the selected layer table attributes to hold the user-calculated weighted averages for the available water capacity calculation.