You stop soil erosion from rain by blocking both the impact of falling drops and the flow of water across your ground. Rain attacks your soil in two ways at the same time during every storm that hits your land. Drops smash into bare dirt and break it loose while runoff carries those loose bits down the slope. You need to defend against both attacks to keep your land safe from storm damage.
Rain erosion prevention starts with covering your bare ground as fast as you can after any soil work. I watched a graded slope behind my house wash away during one hard storm years ago. Gullies cut three inches deep in just an hour of heavy rain that afternoon. The slope next door that had grass on it lost nothing at all in the same downpour. That taught me how fast damage happens on exposed dirt around your home.
My neighbor had the same wake up call when she cleared a spot for her garden on a gentle hill. The first big rain carved channels through her fresh soil and dumped mud all over her patio below. She threw down straw right after and planted grass seed within the week. That simple fix saved the rest of her dirt from washing away over the following months.
Raindrop erosion control matters more than most people think when they first look at their slopes. Drops hit the ground at speeds up to 20 mph which packs a real punch against loose soil particles. Each impact blasts tiny craters in bare dirt and throws soil bits into the air around them. Those particles land in new spots or wash away with the runoff that forms after drops pile up.
Research from Oklahoma State shows the huge gap between bare and covered ground during storms. Vegetated areas produce only 10-20% runoff from rainfall that hits them. Bare soil sends 60-70% of that same rain running off the surface and down the slope. Plants soak up most of the water and hold soil in place while bare ground just sheds water and dirt together.
You can protect soil from rainfall right away with materials you spread over the surface of bare ground. Straw mulch costs little and blocks drops from hitting dirt within hours of spreading. Erosion blankets work better on steep slopes where loose mulch would wash or blow away in storms. Both options buy you time while you get plants set up for long term protection of your ground.
Fast growing grasses give you medium term coverage within three to six weeks of seeding bare areas. Annual and perennial ryegrass sprout quick and spread a mat of green over your soil surface. Their leaves break raindrop force while roots grip dirt particles together below the surface. This layer protects your slope through the critical first year while slower plants get started growing.
Permanent plantings like native grasses and shrubs provide long term rain protection your slopes need. These plants grow deep roots that hold soil tight against washing for years after you plant them. Their thick growth above ground catches rain and lets it soak in slow instead of running off fast. A good mix of plants turns your problem slope into a stable feature of your yard.
Send water flow away from your most tender spots during storms while new plants get going strong. Small berms or swales at the top of slopes push water to sides where it can drain safe. French drains or gravel channels catch heavy flow before it gains speed and cutting power. Every bit of water you redirect is less force hitting your young plants before they root in deep.
Read the full article: 15 Best Erosion Control Plants for Slopes
