Catch basins are an important part of your drainage system they allow sand, sediment, and other materials to settle out of storm water before travelling to a detention basin or drain lines

1. Things You Need to Know about Catch Basins
Catch basins are an important part of your drainage system—they
allow sand, sediment, and other materials to settle out of storm water
before travelling to a detention basin or drain lines. Find out:
● Why Catch Basins Are Important
● How to Keep Catch Basins Clean
● Common Catch Basin Problems
● How to Get Ready for the Spring Snow Melt
http://www.lincolngroup.ca/everything-need-know-catch-basins/