Vulnerability of Surface-Water Features to Groundwater Pumping

These data represent surface water features, derived from the Minnesota DNR's Public Waters Inventory and the US Fish and Wildlife Services' National Wetlands Inventory.<br/><br/>1. PWI basins were intersected with NWI wetlands - the area of each unique wetland type within each basin was calculated. Each basin was then assigned that wetland type which covered the greatest proportion of its extent.<br/><br/>2. Approximate depths were assigned to all wetland types present in the study area. The data were saved in tabular form, and joined to the basins feature class by wetland type - thus an approximate depth was derived for each basin.<br/><br/>3. The basin extents were clipped from the wetlands feature class - wetland fragments less than 60 square meters were then removed, as the basin and wetland edges weren't perfectly coincident, and polygon slivers remained after the clip.<br/><br/>4. The depth table was joined to the wetlands by wetland type, and each wetland was assigned an approximate depth. Adjacent wetlands of the same depth were then dissolved together.<br/><br/>5. Basins and wetlands were merged into a single feature class. An ID was assigned to each wetland, based on the county in which the greatest proportion of the wetland is found.