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The free overfall as a flow measuring device in a circular channel

2001; Volume: 148; Issue: 4 Linguagem: Inglês

10.1680/wame.2001.148.4.235

1753-7800

Mark Sterling, Donald W. Knight,

Hydrology and Watershed Management Studies

The critical depth of flow (h c ) and the brink depth (h b ), for a circular pipe with and without a horizontal bed are used to estimate the channel discharge. The brink depth ratio (h b /h c ) for a given cross section geometry is shown to be a constant for subcritical flow. The brink depth ratios for various channel geometries and bed slopes are presented in a form readily accessible to engineers. Two worked examples, one for an irrigation channel and the other for a larger circular sewer, show how the discharge Q can be obtained from measurement of the brink depth.