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Why is final cover and seeding and/or mulching critical for mound systems?
To enhance aesthetics
To prevent slope erosion
To improve drainage
To promote plant growth
The correct answer is: To prevent slope erosion
Final cover and the subsequent seeding and/or mulching are critical for mound systems primarily because they help prevent slope erosion. Mound systems are designed to manage wastewater by dispersing it over a broad area, and this often involves landscaping that can be vulnerable to erosion from water runoff, especially during rain events. When the slope of a mound is left bare, it can easily wash away soil and disrupt the functionality of the system, leading to potential failures. Covering the soil with vegetation or mulch not only stabilizes the slope but also helps absorb water, reducing runoff and promoting infiltration. This layer acts as a protective barrier against erosion by minimizing the impact of raindrops on the soil surface and reducing the velocity of water moving across the surface. Additionally, the root systems of plants can bind the soil together, further enhancing its stability. While improving aesthetics and promoting plant growth do have their places in mound systems, they are secondary benefits in comparison to the vital role that erosion prevention plays in maintaining the integrity and effectiveness of the system.