Alton-Envirohood.jpg | A storm chamber inlet protected from debride by an envirohood. It is essential that the top of the chamber is lower in elevation than any other outlets from the catchbasin. This is because the chamber’s capacity should be fully utilized before runoff is allowed to travel farther downstream. | Alton-Envirohood.jpg | A storm chamber inlet protected from debride by an envirohood. It is essential that the top of the chamber is lower in elevation than any other outlets from the catchbasin. This is because the chamber’s capacity should be fully utilized before runoff is allowed to travel farther downstream. |