Stormwater & Site Design Studio

Estimate peak runoff, storm volume, detention storage, rainwater yield and a full-flow Manning pipe diameter from one catchment scenario.

Updated September 2026

Results

Workflow

Uses the Rational Method for peak runoff, rainfall depth for event volume, a simple volume-minus-permitted-discharge detention estimate and full-flow Manning sizing for a circular pipe.

Important limitations

Not a complete drainage-network or detention hydrograph model. Time of concentration, inlet capacity, partial flow, surcharge, tailwater, local losses, storage routing, climate factors and local drainage criteria require project-specific design.

Scope & assumptions

Preliminary engineering workflow — verify final design with the applicable standards, project data and manufacturer information.