Why do we care about the stream flow?
High stream flows typically overflow into the stream’s flood plain. This maintains a healthy plant community near the river, and filters the water as it soaks through the soil on the way back to the river. Some plants, such as cottonwood trees, require this flood stage for their seeds to germinate and thrive.
At higher stream flows, the water has more “erosive power” and also carries more sediments. These higher flows help shape streams more than low “baseflows”.
How do human activities affect the stream flow in East Canyon Creek?
Humans alter stream flow by building dams to store water during runoff for later release, or by diverting water for irrigation and other uses. The annual stream flow above East Canyon Reservoir is very different from the flow below.
Urban areas can also greatly affect stream flow. Less water can soak in because of the pavements, resulting in flash floods, and reduced baseflows.
Alternatives to pavement can help reduce excessive runoff from urban areas.