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The Izzard Equation

The Izzard Equation for calculation of roadway flows is often presented without any explanation of its derivation or any justification for its likely accuracy. It is in fact the familiar Manning Channel Flow Formula applied to a channel of triangular shape. For that reason channel roughness coefficients to be used are the familiar Manning coefficients.

This bulletin looks at the derivation of this equation and gives a solution for calculation of flows for the roadway cross section shown above.

To read more or download Roadway Flow – Technical Bulletin No 6, click on the link below.
Bike Safety
Roadway Flow Technical Bulletin No 6 ( 0.83MB PDF FILE)
Australian owned and operated.
Design and manufacture of components for inlets to Stormwater drainage systems.
Maximum hydraulic efficiency of inlet components for lowest cost capture of approach flow – hence the name Max Q.
Fully quality controlled production.

Standards Australia - Quality Endorsed Company - Licence No 11222

Phone: 07 3832 3323
Fax: 07 3832 3321

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