Water and Wastewater Terms Beginning H

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

haunching

The portion of the material placed in an excavation on either side of and under a pipe from the top of the bedding up to the springline or horizontal centerline of the pipe. This backfill layer extends from a trench sidewall to the opposite sidewall. This is the most critical area in providing support for a pipe.