The Numurkah Stormwater Management Strategy was prepared by Moira Shire Council, in collaboration with Spiire, for a growth area north of Wattle Drive in Numurkah, intended for future residential development.

The strategy includes urban design concepts, catchment plans, flow estimation, hydraulic calculations, water quality modeling, and a drainage strategy.

• The growth area is about 43.3 hectares with minimal slope, making overland flow management challenging.
• Lake Numurkah, located to the south, acts as a drainage basin and faces seasonal drying.
• The site is prone to flooding from Broken Creek during high rainfall events, necessitating flood mitigation measures such as a proposed flood levee.
• There is an existing irrigation channel (No. 6/6) from Goulburn Murray Water, which will eventually be piped to manage flood risks effectively.

Various drainage strategy options were considered, with a preference for a pumped retarding basin and raingarden discharging through Wattle Drive.

The proposed development plan integrates with existing and planned infrastructure to ensure coherent urban development.

The growth area will be developed in four parcels, with planning approval already obtained for Permit 1.

Key objectives include road connectivity, green open spaces, central water-sensitive urban design assets, and maintaining existing site features like a local café.

• The strategy addresses flow conveyance, water treatment, and flood management.
• Flow conveyance involves designing infrastructure to manage and direct storm water efficiently.
• Water treatment will use water-sensitive urban design principles to maintain water quality.
• Flood management includes measures like retarding basins and appropriate grading to handle potential flood events.