The shallow depression collects and filters rainwater from impermeable surfaces such as roofs, driveways and streets. By capturing runoff, this allows water to infiltrate through soil and plant roots, filtering and slowing the flow to reduce pressure on the drainage network.

Although a rain garden can be installed anytime the ground is not frozen, the optimum time for this is when the soil is sufficiently dry enough to work with. For the best establishment of plants, early autumn to spring is advised.

The ideal rain garden plants are moisture-tolerant species which have deep root systems to enhance water absorption into the soil while also enduring dry periods. Native plants are always recommended as they are well adapted to local growing conditions and support wildlife.

As plants establish, regular watering will be required. The SuDS also benefit from weeding, pruning, replanting if needed, and ensuring drainage inlets remain clear.