Water from next door

[Stone Teran]

I will be closing on a property this Friday and I went over there today during heavy rains to see why the bottom floor floods.  The business next door has an odd abandoned/under-construction parking lot that drains into my (future) property.  I plan to talk to them about it.  If they tell me to piss off, would I typically have grounds to either force them to fix the problem and/or compensate me for it?