House or building sewers and house or building drains must, where possible, be given an even grade to the main sewer of not less than one-quarter of an inch per foot.
53 P.S. § 4609
House or building sewers and house or building drains must, where possible, be given an even grade to the main sewer of not less than one-quarter of an inch per foot.
53 P.S. § 4609