Recent heavey rains caused problems with water run off. My neighbor has contacted me about putting in French drains to prevent water run off from causing him foundation problems. Also my back yard is slowley ending up next door. What legal obligations do I have with this matter? How much does it cost for a French drain. I estimate to extend from my back yard to the street in front is approximatly 80 feet.Please E-Mail me at firstname.lastname@example.org Cost, benefits, and contacts.