Catch basins are storm sewer inlets that collect water during storm events and are the first step in the stormwater drainage systems. Storm sewer systems are designed to remove water from our developed areas as quick a possible during storms. When storms occur, water and anything else on the streets enters the storm sewer system through the catch basins. Pet waste, oil, litter, and leaves carried in the stormwater is discharged directly into our streams and rivers untreated.