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Synopsis Two sets of experiments with irregular channels were designed and carried out in order to clarify some aspects of resistance to flow in irregular channels and to separate losses due to boundary shear from those caused by the irregularities in the flow cross-section ("form" losses). It is demonstrated that a certain type of irregularity, in which the flow cross-section remains constant or nearly so, does not produce any "form" loss. This type of irregularity is the one in which any change in the width of the channel is associated with a change in the elevation of channel bed (change in depth of flow) such that the flow cross-section remains the same, or nearly so, through the irregularity. However, other types of irregularities associated with rapid changes in flow cross-section, in which the flow cross-section does not remain constant through the irregularity, produced "form" losses which accounted for up to 92% of the total loss in the channel.
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