Stormwater is runoff. When it rains, snows, sleets, or hails that precipitation comes into contact with many types of surfaces in the city: buildings, parking lots, streets, houses, yards, cars… and the list goes on! Ideally rain water would be absorbed into the ground, however in urbanized areas like Waco there is a lot of impervious surface that prevents absorption. When the rain water can’t be absorbed it becomes runoff. Without our storm drainage system that runoff would cause a lot of flooding.
Our MS4 is comprised of storm drains, ditches, lined and unlined channels, creeks, and streams. Stormwater in the City of Waco drains into these conveyances and flows to Lake Waco, the North Bosque River, and the Brazos River.