OAR 340-051-0055: Guidelines for the Design and Operation of Animal Waste Control Facilities: Drainage and Waste Volume Control

(1) Roof drainage and uncontaminated surface drainage should be diverted such that it is not allowed to flow through confinement areas or enter waste water holding lagoons, sumps or tanks, unless it can be demonstrated by detailed design and proven operational practices that wastes and contaminated drainage waters can be effectively controlled by other means. (2) Where large winter use confinement areas are exposed to heavy rainfall, and wastewater storage and disposal capacities are limited, such areas should be covered to minimize wastewater volume. (3) Waste collection systems utilizing water for flushing manure from floors should minimize water use, and washwater reuse practices should be employed wherever possible. (4) Animal drinking water and atmospheric control sprays should be managed such that drainage through contaminated areas is minimized.