Water and Wastewater Terms Beginning P

A B C D E F G H I J K L M N O P Q R S T U V W Y Z

pipe grade

The angle of a sewer or a single section of a sewer as installed. Usually expressed as a percentage to indicate the drop in feet or tenths of a foot (meter) per hundred feet (meters). For example, 0.5 percent grade means a drop of one-half foot (meter) per 100 feet (meters) of length.