URBAN RUNOFF DIVERSIONS FOR WATER QUALITY CONTROL - THEIR BENEFIT TO BEACH WATER QUALITY, AND THEIR IMPACTS ON WASTEWATER TREATMENTS WORKS

摘要

The City of Los Angeles has been constructing dry weather diversion projects throughout the City for thernpast several years. The purpose of the program has been to divert dry weather urban runoff fromrnstreams and beaches to improve water quality at the beaches during the dry summer months when thernbeaches are frequented most heavily. Since inception, the City has constructed numerous diversions,rnresulting in a substantial amount of all dry weather flows being diverted from beaches. Beach bacteriarncounts have been observed to be decreasing since the inception of the program suggesting that dryrnweather diversions are an effective means to improve beach water quality. Data from the waste waterrntreatment works and collection system also suggests that there have been no adverse impacts to therntreatment works or collection system from this dry weather flow. This paper will present data fromrnbeach water quality, data from the Hyperion treatment plant, and data from the collection system thatrnshows these conclusions. Dry weather diversions can be a very effective tool for improving beach waterrnquality.