OWP will be closed from 4:00 pm on Friday, December 20, 2024, until 8:00 am on Thursday, January 2, 2025, for Winter Break.
(All times are PST.)

If exams are submitted:	Course certificates will be mailed:
By December 13th	By December 20th
After December 20th	Early January

Please note: Postmark dates will not be honored.

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 wastewater collection line or a single section of a collection line 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 0.5 feet (meters) per 100 feet (meters) of length.