Facilities - Identify Underground

Underground facilities and structures

Underground catch basins/storm drains, manholes, vaults and drywells are invisible except for a manhole cover or inlet grate.

Underground structures are used to trap sediment and debris, allowing stormwater to soak into the ground and filter pollutants. They are used as a junction between pipes to route stormwater.

Wet facilities
Dry facilities

Introduction to recognizing facilities on your property

Dry well Lid

Drywell lid (sometimes this lid is also a manhole or closed detention vault)