No absolute water levels are provided. The time period of source information used to create this coverage was published in Dunn, 1977. The coverages were built and cleaned and checked for node errors with no dangles, incomplete polygons or node errors known. No known overshoots, undershoots, dangles or open polygons are known to exist. Both electronic and visual searches were made for such errors.
All polygons have labels and attributes.
The data is incomplete, however, for the boundary of the Local Water Quality District. The Hackett et al. This data represents the water level in wells on the date drilled. Not all wells were allowed into the data base. Wells were located based upon address and subdivision block and lot data.