Sources of Pollution

You can tell something about the land use in an area by examining its aerial photograph.  For example, Agriculture shows as large rectangular fields of cropland.  Hydrological modification shows as straight channels made when canals are dredged, and square ponds made when fields that are surrounded to control water level become flooded.  Urban areas that contribute runoff show as jigsaw puzzle looking features with multiple colors located along waters bodies in this watershed.