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A well-designed rain garden is intended to manage stormwater runoff effectively while promoting biodiversity and enhancing the landscape. The primary components of a rain garden include soil, stone, and vegetation.

Soil is crucial because it aids in the filtration of water as it percolates through the ground, allowing harmful substances to be captured while promoting groundwater recharge. The type of soil used often includes a mix that supports plant growth while also enhancing water retention.

Stone typically plays a role in facilitating drainage and stabilizing the structure of the rain garden, helping to prevent erosion and providing aesthetic appeal.

Finally, the vegetation selected for a rain garden is vital for managing runoff, as plants absorb water and help to filter pollutants. Native plant species are commonly used, as they are better adapted to local climate conditions and support local wildlife.

In contrast, materials like concrete, metal structures, grass and synthetic materials, or plastic and rubber liners do not align with the primary goals of a rain garden, which focuses on natural water management and ecological benefits.