OAR 340-051-0065: Guidelines for the Design and Operation of Animal Waste Control Facilities: Conveyance Facilities and Practices

(1) Liquid manure irrigation systems should have delivery mains buried wherever practicable to minimize the amount of pipe exposed to the hazards of surface damage and failure. (2) Trucks or tank wagons carrying manure or manure slurry on public roads should be of water tight construction and sufficiently closed or baffled to prevent spillage of any kind. (3) Manure slurry delivery pipelines crossing streams or gullies should be permanently placed with adequate protection from streamflow hazards and/or braced to prevent excessive bending stress in the pipe.