BCAB #1212 - Sentence 18.104.22.168.(3) - Manhole Size
June 21, 1990
Re: Sentence 22.214.171.124.(3) - Manhole Size
Drainage system for a new school.
Reason for Appeal
Plumbing Code Sentence 4.7.3.(3) requires a manhole to be one metre (39.4") in diameter. Appellant proposes to use 36 inch (.91 metre) manholes as one metre manholes are not available.
The one metre size resulted from metrification of the Plumbing Code and replaces the old standard three foot manhole. The appellants contend that three foot manholes are generally accepted and provide the performance level required by the Code.
Building Official's Position
The plumbing inspector has asked for a 3' 6" manhole because he feels it is the minimum acceptable available size for a workman to perform maintenance using flushing equipment and the minimum permitted by the Code is 3.2 feet. The 3' 6" size is also consistent with their Engineering Dept. and other jurisdictions in the Lower Mainland.
Appeal Board Decision #1212
Sentence 4.7.3.(1) of the Plumbing Code clearly stipulates a minimum manhole diameter of 1 metre which is 39.37 inches. Therefore, a manhole of only 36 inches or .91 metres is not acceptable.
George R. Humphrey, Chair