Design of a stepped rain garden plan

Quick answer：

A stepped rain garden plan is a landscape design that incorporates terraced levels to manage stormwater runoff effectively. These gardens are designed to absorb and filter rainwater, reducing runoff and preventing soil erosion. The terraced levels allow for a gradual slope, promoting infiltration and providing multiple layers of vegetation to trap pollutants and reduce nutrient runoff. The design typically includes a base layer of permeable materials, a layer of mulch, and a series of stepped levels with various plants suited to different soil and light conditions.