I have a customer that has a wet spot on the side of her house. I think that there might be a spring there. She is in a subdivision and her house and her neighbors side yards drain down into this valley and runs though the back yard. I was thinking of running a french drain with pipe and pea gravel and day-lighting it out into the woods behind her house. The back yard already slopes that way so it should be easy to get some fall. It is about 110 ft long how do you price something like this? I have read some other threads and it looks like around $12 per foot. That seemed a little high to me but maybe not. Thanks.