Well, that there sucks..hmm..littering? maybe you could get the cops to charge them with littering, easy "fine" money for them. the word would get around and they would switch to a yard vacuum for cleanup instead of blowers.
Our county spends money like..uhh. insert any appropriate reference, but they do keep the drains done and the roads fixed and contract out the line clearing a lot. After the big flood some years back they learned their lesson, I think too many rich folks and even too many gov workers freaked out over it. compared to you guys rain it wasn't a lot, six inch, but it all fell in four hours, and being in a huge valley with mountains each side, man, low areas with creeks and river frontage like here built up fast.
Down here it's flat, so no where for water to go except into rivers a bayous. Harris county has been doing a lot of retention areas throughout flood prone areas. There making retention holding areas along side bayous and some are huge..
But since my culverts are clogged up, the water never gets there.
My street has 24" culverts, and most only have a few inches that water can get through.
I have started hounding the local news about it so maybe they can look into it.\
Funny, once the media runs a story, suddenly people take notice.