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 N
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
nominal diameter
An approximate measurement of the diameter of a pipe. Although the nominal diameter is used to describe the size or diameter of a pipe, it is usually not the exact inside diameter of the pipe.
