Grass clippings.

Grass clippings. Grass clipping through into the street is unlawful because it clogs the catch basins that could potential cause flooding or pollutians into streams.

Some people have been known to sweep their grass clippings into the street.
It's just to let people know that clippings can cause flooding by clogging up basins.

This helps your area keep from flooding or getting your sewer drain cleaned out.
It could even cause sewer backage. This is another perventive measure for the local community to participate in.

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