Now, my solution will get the 'coons out of the storm drain- but it won't necessarily prevent them from moving to a better real estate location....
....go to
http://www.yardlover.com/products.php?pid=845 and you will find coyote urine crystals....yes, really. Place these around and in the storm drain- it should trick the coons into thinking Mr. Wiley Coyote has taken up residence. Repeat after every rain until they are gone...
....a cheaper solution is to have your husband pee in the storm drain and scent mark it- as coons don't like humans, either. However, the tickets for indecent exposure and urinating in public probably cost more than the coyote urine crystals-
IF he gets caught. The public humilation from the neighbors could be costly emotionally....but worth the great laugh for you.
I guess I would stick with the coyote urine. Be sure and use it around anywhere else you don't want them to move to.....e.g., around the porch, near a shed, etc. Let them move to the next street over! And WHERE GLOVES when pouring it- even the crystals STINK!
BTW- we live on an acre in the woods (yes, woods in Illinois!)....we have a plethora of coons, possum, coyotes, fox, rabbits, moles and voles, deer, skunk, snakes, etc. and we manage to coexist- well, I hate when the owl dive bombs me when I let the dogs out, and we did worry that the hawks might get the cats were they were kittens. We don't use the urine crystals at home because we don't care if they share the woods with us....but I have used the coyote and fox urine in my research (don't ask)....it does stink and rodents and other "vermin" hate it!