Controlling erosion and waterflow is key to both your landscape and the environment. There are several steps to retaining an elevated piece of earth starting with the proper drainage at the bottom. Earth moves over time and conditions, the proper assembly will ensure that your project lasts longer than just the next season. All gutter flow should be directed away from any structure you want to last, which can be tricky when there is a giant slope near your property. Fill, slope, flow, and distribution create successful drainage.