The Greenville-Banning Channel Urban Runoff Diversion Project was one of four channel sites chosen for the Urban Runoff Diversion Project within the Talbert Valley and Lower Santa Ana River watersheds; the other three Urban Runoff Diversion Projects were: the Huntington Beach Pump Station, Talbert Channel, and Santa Ana River Channel.
The purpose of the Urban Runoff Diversion Projects is to prevent untreated urban runoff from reaching the ocean waters. Urban runoff has been suspected as one of several possible sources that may contribute to high coliform bacteria counts along Huntington State Beach. The projects include the installation of pumps to divert over 95% of the non-storm runoff from the Talbert and Lower Santa Ana River watershed to the nearby OCSD wastewater treatment plant. The proposed projects divert seasonal urban runoff (containing animal waste, fertilizers, waste oils, and other chemicals that are nutrients for bacteria) into the sanitary sewer system at four different locations to reduce water pollution.
The construction of the Greenville-Banning Channel diversion included the installation of low flow pumps and an inflatable rubber dam which diverts non-storm water to OCSD for treatment before it reaches the ocean. The rubber dam is located on the Greenville-Banning Channel east of the existing bicycle trail bridge across the Santa Ana River and 2500 feet downstream of Adams Avenue. The pumped discharge flows westerly through a discharge pipe attached to the bicycle bridge, then southerly along the Santa Ana River maintenance road, then westerly on Atlanta Avenue to an existing OCSD sewerline at Brookhurst Street.