Answered on Apr 21st, 2014 at 6:32 PM
It sounds like you may have a cause of action against the city if the city created a condition that is causing erosion on your property. Have you contacted the city about the issue? Is the pipe discharging runoff from rain water?
When did you initially become aware of the erosion? There are special rules that govern claims against public entities, so it would be wise to move on this fairly quickly to avoid having any potential claim become time barred.