MANHOLES are built with lateral, branch, main, trunk, and inteceptor sewer lines for the purpose of allowing access to the sewer lines by people and equipment for maintenance and repair functions. They are the round metal lids that you see mostly in streets. They are not just used for access to sewers but also for acess to water, electric, telephone, and natural gas facilities. Generally the function of the manhole or the agency it belongs to is cast into the lid. You should never remove a manhole lid of any kind for any reason.

Manholes in straight run sewer lines are generally not placed any further apart than the distance that can be cleaned by the appropriate type of equipment, this distance is generally 300 to 500 feet. Manholes are also placed at any change in sewer line direction, sewer line slope, sewer line elevation, pipe sizes, and sewer junctions.

Click on the images below to view larger images:

Loading a precast eccentric manhole structure cone section	Building an eccentric precast manhole structure	Laying 18" trunk sewer line
Bedding 18" trunk sewer line	Repairing caved-in trunk sewer line	Repairing caved-in brick trunk sewer & vitrified clay catch-basin lead
16' deep collapsed 60" brick interceptor sewer	PVC 18" trunk sewer pipe	8", 10" & 12" PVC branch sewer pipe
Vitrified Clay Pipe	Vitrified clay pipe and precast concrete adjustment rings

Maintaining a Wastewater Collection System >>

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