I have a serious problem that my city calls a common enemy...Hillside Erosion. The city says , "Not Our Problem"! I share a common hillside with "close", not very nice, neighbors. When it rains the water is pouring down the hill from under their gate which sits exactly at our common fence line. Huge ruts have developed on their side of the fence which at this point opens up for both of us down the hill. The runnoff is down to the concrete holding the fenceposts on a part of a 6 ft section of fence that belongs only to me, but is happening on their yard. I need an easy, cheap, attractive fix for this 6 ft in their yard. HELP!!!!!!!!