The first step in understanding erosion is knowing what is causing the erosion. What is the problem stemming from. There's so many options! Poorly placed downspouts, bad grading, no sunlight to allow vegetation to grow, steep grades, landscape upgrades, tree removal, and on, and on. I typically try to get customers to start by thinking back to when this issue started, or maybe just identify where the water is coming from. Maybe the source can be differed into a safer corridor.