Inflow Dishes

Published: February 17, 2018 | Last updated: July 5, 2023

What Does Inflow Dishes Mean?

Inflow dishes are a type of manhole insert manufactured from high-density polyethylene (HDPE). These shield surface water from infiltrating through the manhole cover and entering the chimney and barrel.

The dish is positioned directly below the manhole cover and is firmly seated around the manhole frame rim. Water that enters through the manhole opening is caught by the dish and ejected through the manhole cover pick holes.


Trenchlesspedia Explains Inflow Dishes

Inflow dishes are a simple and cost-effective solution to preventing water ingress through the lid of manhole sections. A leaking lid causes water to enter the manhole chimney and barrel, which can result in structural deterioration. This can give rise to extensive repairs and traffic disruptions, which can be costly.

Before installation of the dish, the manhole cover is removed, and the rim is cleaned to remove all dirt and debris. The inflow dish is then manufactured in accordance with the manhole frame and cover size to ensure that the dish is seated firmly around the frame rim.


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