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 S

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

small-diameter gravity sewer (SDGS) system

A type of collection system in which a series of septic tanks discharge effluent by gravity, pump, or siphon to a small-diameter wastewater collection main. The wastewater flows by gravity to a lift station, a manhole in a conventional gravity collection system, or directly to a wastewater treatment plant.