Waterwise Wednesday: The First Flush

The First Flush is the initial stormwater runoff that picks up pollutants as it flows over surfaces. The photos below show what the first flush looks like at two Scottsbluff outfalls.


The swirl sheen indicates oil and grease washed off the roads by the stormwater runoff.
Murky gray water of the first flush carrying sediment, oils, heavy metals and other pollutants.
The clear water on top is clean groundwater that typically flows from this outfall. The murky gray water is first flush stormwater mixing with the clean groundwater as it travels to the North Platte River.