Something Shrek said got me thinking. He said that a friend had 10 raised beds over an acre of drainfield and all was well. Has anyone else done that? 3/4 of my 3/4 acre is covered in 2 leach fields. One failed after 10 years and the second one is 20 years old. I have a thing that enables me to switch between the two which is good in the winter when the snow is melting and saturating the soil. I do have one raised bed in the main area but I have read that too much weight on top not only crushes the pvc pipe but the water is not able to evaporate as easily. My soil in that area is only about a foot deep. They had to blast for the second drain field. I live on a volcanic plateau. Anyone else have any experience in this problem? I sure would like to increase my garden area.