WSUD & Stormwater Management

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A Water Sensitive Urban Design (WSUD) report, often referred to as a Stormwater Management Plan, is a mandatory requirement for most development types—including residential extensions over 50 sqm, commercial projects, and industrial complexes. The objective is to achieve specific load reduction targets for urban runoff:

• Suspended Solids: 80% retention
• Total Nitrogen: 45% retention
• Total Phosphorus: 45% retention
• Litter: 70% reduction

Compliance & Modeling Tools

These targets are verified using industry-standard modeling software, ensuring your project meets local council expectations:

• MUSIC: Model for Urban Stormwater Improvement Conceptualisation.
• STORM Calculator: Provided by Melbourne Water.
• InSite Water: Utilized for specific council requirements.

The Assessment Process

The assessment evaluates the entire proposed site, focusing on all impervious areas. The initial analysis determines how the site performs using standard rainwater tanks. If further mitigation is required, advanced treatment methods are integrated, such as rain gardens, buffer strips, pervious paving, and enviss pits.

Once a STORM score of 100% or greater is achieved, a comprehensive roof catchment plan is developed to document the requirements for WSUD excellence and regulatory approval.