This is a statewide polygon layer in which each polygon has a unique Water Body Identification number (WBID). The assessment units are drainage basins, lakes, lake drainage areas, springs, rivers and streams, segments of rivers and streams, coastal, bay and estuarine waters in Florida. The polygons roughly delineate the drainage basins surrounding the water body assessment units. The WBIDs are used in the Basin Rotation Total Maximum Daily Load (TMDL) program as well as other applications. WBIDs are assigned a FDEP district as part of their attribution. There are multiple instances where a WBID may be assigned to an FDEP district, but physically fall within the boundary of a different district. This is because WBIDs are grouped together into basins called Planning Units and there are instances where a Planning Unit basin will fall across FDEP district boundaries. In these cases, for consistency's sake, all the WBIDs that are in the Planning Unit will be assigned to the same FDEP district. For information on which district the WBID physically falls in, please refer to the FDEP Regulatory Districts layer.