Vegetative filters were installed to treat runoff from two beef feedlots, one dairy lot, and one swine feedlot in central Illinois. Two configurations were used-channelized flow and overland flow. Runoff underwent settling for partial solids removal and was then applied directly to vegetative filter area. Runoff from most smaller rainfall events infiltrated completely, resulting in no discharge. Runoff from larger events partially infiltrated and partially discharged. Discharge sample analysis indicated a removal of over 95 percent of nutrients and oxygen demanding materials on a mass balance basis and over 80 percent reduction on a concentration basis when compared to runoff applied to the filter area. Discharge rates were very low and minimal dilution was necessary to meet state water quality standards. Design criteria were developed for overland flow and channelized flow systems. The proposed criteria would completely infiltrate runoff from small storm events and provide adequate treatment for discharge during larger events.

Grant no. R804341-01-1. Aug. 1979. Includes bibliographical references.