Actual scene photo of a stepped rain garden

Quick answer：

A stepped rain garden is a landscape design feature that incorporates multiple levels to manage stormwater. It collects and filters rainwater through layers of soil, plants, and other permeable materials, reducing runoff and promoting infiltration. The stepped design allows for better water flow and plant growth, and it can also be visually appealing. Rain gardens are an eco-friendly solution for managing urban stormwater and can improve water quality and reduce flooding.