No water pipe shall be roughed out closer than three feet (3') from the sewer pipe at the foundation of any building, and shall not be laid in the same trench with the sewer line or be so constructed as to cross the sewer line, and no water pipes shall be laid in the same trench as sewer, gas or any other pipe, but a separate trench must be provided for such water pipe at least three feet (3') horizontally from all other pipelines. (Prior code § 49-6-16)