The difference between irrigation canals and storm drains in Phoenix, Arizona
As a former teacher, I know that it's important not to be too terribly fussy about some things, or else everything you say just becomes trivia. For example, here in Phoenix I commonly hear the word "mall" when in reality a particular place is actually a "shopping center". And for legal purposes, this can be important, such as clarifying that the Arrowhead Mall is different from the Arrowhead Towne Center, but in casual conversation, I know what you mean, and there really is no difference. So when people call storm drains and canals "irrigation canals", I tend to let it go. I know what you mean - it's a thin slice of land that water goes through. If I lived by a canal, or a storm drain, I certainly wouldn't consider it "waterfront property" - in fact, that gives me a chuckle. But if you really do want to know the difference between canals and storm drains, it's simply that one takes water in, and the other takes water away.