Water and sewer line need a horizontal separation of (5) five feet. Where. crossings are necessary, encase the sewer line with a continuous ductile iron pipe. of sufficient length, located such that a minimum (5) five feet separation exists. between each end of the casing pipe and the water line.
The difference has to do with cultural norms. The term 'culture' refers to attitudes and patterns of behavior in a given group. 'Norm' refers to attitudes and behaviors that are considered normal, typical or average within that group.
Norm: taboos. A norm society holds so strongly that violation results in extreme disgust and belief that the person is unfit to be a part of society (e.g. cannibalism) Norm: Laws. Strongest norms that are codified into legal sanctions (e.g. murder, theft, illicit drug use).