What is the purpose of a splash block in drainage systems?

The purpose of a splash block in drainage systems is primarily to prevent roof drainage erosion. When rainwater flows off a roof, it can create a significant amount of energy at the point where it hits the ground. This high-energy impact can lead to soil erosion, particularly if the ground is unprotected and susceptible to washout. A splash block is typically placed beneath downspouts to disperse the water flow over a larger area, reducing the velocity of the water as it exits the downspout. By doing this, it minimizes erosion around the foundation of a structure and helps maintain the integrity of the soil and landscaping.

Enhancing aesthetic appeal, directing water flow, and storing rainwater may all be relevant considerations in a broader context of drainage design, but they do not directly address the specific function of a splash block as effectively as erosion prevention does.