As the Froude number approaches 1.0 (critical depth), the user should strongly consider alternative methods. For installations immediately downstream of concrete channels, a vertical velocity distribution coefficient of 1.25 (an option in the calculator) should be used due to the difference in velocity profile over the two surfaces.īoth the EM 1601 riprap computation and HEC-RAS model application are suitable for shallow slopes with gradually varied flow.

In expanding transitions, flow can concentrate on one side of the expansion and design velocities should be increased. In areas where flow changes from tranquil to rapid and then back to tranquil, riprap sizing methods applicable to hydraulic structures (HDC 712-1) should be used.

The procedures in this calculator are applicable to gradual transitions where flow remains tranquil.

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