Last fall, a soil expert came to my house to assess the site and our drainage problems. This is a nice free service. Based on soil survey maps of the area, he determined what type of soil we have and then could recommend how deep we have to dig the rain garden to reach soil with better drainage. He had tips on how to install overflow pipes and where to buy inexpensive mulch. He was very willing to walk up and down our slope to see all our problem areas and recommended how to deal with each.
|Eroded trench in my yard (with tape measure in inches for scale).|