Alan,

This site has some 3 1/8" sink strainers, which could possibly
work for you:

http://www.neatitems.com/strainer.htm

It seems that it should be fairly easy to make your own strainers
if necessary. The moderately open-mess gutter screen material
might be a good item to use, since it is designed for a similar
purpose and intended to block materials which are of similar size
to what you want to block. It should be available at any hardware
type store.

I'd make 4 or 5 strainers, cut to the appropriate size from the
gutter guard material. Then I'd use super-glue gel to bond
several small super-magnets around the perimeter of each screen
to help hold it in place over the (metal) drain in the driveway.

Small used super-magnets are rather inexpensive and available
on the Internet. They are made of Neodymium-Iron-Boron and
are recovered from motors, microwave ovens, disk drives, etc.
The $0.20 magnets (item #10) at this site might work for the idea
I suggested:
http://www.wondermagnets.com

If you feel that the screens won't clog often and don't need to
be removed often, then obviously a more permanent method
of attachment would be preferable to using the magnets.

Good luck,
Gideon

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Alan Smithee wrote in message ...
I have a 3" drain on my driveway next to the house which takes rainwater and
puts it back into the city's sewer system. During stormy weather the drain
has a tendency to slow down or stop because of bits of twigs, leaves and
other debris start to accumulate around it. If this happens it's possible
that my garage floor gets flooded because a small lake starts to form around
the drain. I've heard of laundry sink strainers can help. Do they make this
in a 3" size? How else could I fix this problem?