Downspouts and retaining walls
We bought a house and the landscaping in front consists of these mounds of earth covered with landscape cloth and mulch. They're maybe 8 inches above the level of the yard and one is probably 6' by 15'. The mulch washes down the sides of the mounds and it's a mess to mow near them. I thought about removing the biggest mound then I thought about building a retaining wall around it. My issue is a downspout. I don't think all the water from the downspout would be good for even a short retaining wall. Would the drainage pipe that I've seen in retaining wall how to videos be enough to handle the flow from a good hard rain? Do I make an exit through the wall for the pipe?