Grassed swales and water retention ponds pretend to be drain away dirty and surface water run-off through collection, storage, and cleaning (via bio-filtering) before allowing it to be released back into the environment. Surface runoff will be directed to the grassed swale system where it will be filtered by plants. The cleaned water then will be used in climate-smart urban farming precinct to realize some of the municipality-enabled urban farming activities.
Vegetated swales can be easily implemented as they are linear structures. However, if combined with water retention ponds, surface requirements are larger.
Vegetated swales get the recovery of the investment in about 5 years.