wrote:
On May 4, 12:00 pm, Steve Barker wrote:
Anything that can get through the hole at the top will pass through
the downspout. no screen is recommended or needed.

In my neighborhood (built in the 1920's), all the downspouts run into
the ground and connect to the storm sewer system in the street. So I
need to keep stuff out to prevent clogs in the underground long
horizontal runs.

I have downspout screens that look like this:

http://www.guttersupply.com/p-screen...rs-round.gstml


The storm sewer needs "roughage," just like your digestive system.

That's why I put grass clippings in the street drain.