The storm water system for Rohnert Park consists of the City’s street gutters, storm drain inlets, catch basins, pipes, and outfalls, as well as ditches and constructed channels mostly maintained by Sonoma Water. The entire system diverts rain and other runoff away from developed property. The storm water system is entirely separate from the sewer system; storm water and other runoff that enters the storm water system are not treated before it flows to the local creeks and rivers.