The only escape was the Weser River, which was flooded with spring runoff.
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Currently, efforts are being made by the Natural Resources Conservation Service of the United States Department of Agriculture to reduce the number of bacteria introduced into the river from untreated sewage, sanitary sewer overflow, agricultural runoff, leaking septic tanks, etc.
Satellite imagery has been used to identify thermal bars using their thermal characteristics as well as the concentration of suspended materials on their shoreward side, typically due to surface runoff to the lake.
Infiltration/Inflow, inappropriate connection of surface runoff drains into sanitary sewers