What is the minimum percentage of grade allowed for a planter next to a structure?

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The minimum percentage of grade allowed for a planter next to a structure is critical for ensuring proper drainage and preventing water accumulation, which can lead to structural damage. A grade of 0% to 1% allows for very gentle slopes that facilitate water movement away from the foundation without causing erosion or excessive runoff.

This slight gradient is adequate to guide rainwater and irrigation runoff towards drains or away from the building, promoting healthy soil moisture levels while protecting against potential water damage. In landscaping practices, especially near structures, water must be directed away to maintain structural integrity and avoid issues related to water pooling or saturation.

Higher percentages, such as those mentioned in other choices, would create steeper slopes that are unnecessary for planters and could result in soil erosion, increased runoff, and difficulties in plant maintenance. Thus, the 0% to 1% range is optimal, balancing effective drainage and practical landscaping needs.

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