I thinks it's a question of money: "underground" hydrants in the streets are more expensive, and have to be checked regularly for dirt... (once in a year in Germany if I remember well). So the US went for the cheap solution, which is fine but needs to make sure nobody leaves his car in front of the hydrant.
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I thinks it's a question of money: "underground" hydrants in the streets are more expensive, and have to be checked regularly for dirt ... (once in a year in Germany if I remember well). So the US went for the cheap solution, which is fine but needs to make sure nobody leaves his car in front of the hydrant.