Mason Park Biotention Water Sensitive Urban Design (WSUD) principles have been incorporated into the upgrade design of the Mason Park carpark, Underwood Road Homebush. Essentially, the designs aimed to treat runoff from the car park prior to discharging it in a cleaner state into Saleyards Creek, Homebush.

The resurfaced car park has been graded to direct water from the parking area, through existing mature vegetation and into a graded swale planted out with native grasses to uptake pollutants. Water then enters an overflow pit which then discharges water into Saleyards Creek. The swale has also been designed to capture and treat runoff from the surrounding sporting fields prior to release in to the nearby creek.