A creek rises at my doorstep. My driveway is a spillway washed by surf I’ve never heard. An estuary of the Pacific Ocean flows between the basketball courts and the picnic shelter in my neighborhood park. Where I live is seven miles from the coast, but the sea laps its streets unseen. The Los Angeles County Flood Control District manages the network of catch basins, laterals, conduits and channels that puts my doorstep one step away from the open ocean. The network is for stormwater, but it also carries the daily runoff from more than 2,000 square miles of watershed.