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 B

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

base

(1) A substance that takes up or accepts protons; dissociates (separates) in aqueous solution to yield hydroxyl ions (OH–); or contains hydroxyl ions, causing it to react with an acid to form a salt or possibly causing it to react with metals to form precipitates. (2) The bottom of the inside of a manhole. Also called apron, bench, or shelf.