I called the city and there is definitely an ordinance against dumping your sump discharge onto someone else's property. I also talked to my neighbor and told him, not asked, to stop!! He said, "It's draining into the street." I told him it was soaking into the dirt where it's landing. The city inspector's office will be making unannounced visits to my property for a couple of weeks. They can't send him a letter telling him to stop this practice until they actually see the water being dumped next to my driveway. I should have taken pictures! Water is going to be a problem for longer than a couple of weeks, seepage will still be going on after the crest. I'm going to have some friends check on the house after I'm gone.
Thanks all for your input!!