Flow Charts

The charts allow assessment of allowable roadway flows, in drainage system design, for criteria stipulated in Qudm, the Queensland Urban Drainage Manual.

Criteria

Calculations are based on the Izzard Equation for flow in a triangular channel and the manual includes an explanation of the derivation of this equation and how it is used for calculation of allowable flows.

Interactive Design Aid

An interactive design aid that allows calculation of flows for many conditions outside the scope of this manual is available for download.