Stormwater requirements in SMAF areas can be complex, particularly where detention and retention outcomes need to align with Auckland planning expectations. This calculator helps users work through those requirements more efficiently and establish a clearer basis for stormwater planning.

The SMAF Calculator supports engineers, developers, and specifiers by making it easier to assess likely stormwater outcomes and move toward a more compliant solution. It is designed to reduce complexity early and provide a more practical path through detention and retention calculations.