IYU Carpark Experiment, Pakenham

Study site at the IYU Carpark

This design aims to retain large volumes of stormwater in the landscape to support street trees. Although we are testing this design in a carpark, we have manipulated the system/catchment area ratio (10%) to mimic the intended application: a typical street in a new residential development.

Key design elements:

• a grated inlet pit with a sump to intercept sediment takes flows from the impervious catchment
• flows are conveyed by 225 mm solid pipe to a structural soil trench
• 225 mm slotted pipe in the trench promotes exfiltration
• a 300 mm deep reservoir in the structural soil trench is created by a riser in the downstream pit