To advance studies of fluvial morphology, of the understanding of the effects of channel character upon streamflow, and of the analysis of channel changes, it is desirable to have a volumetric index of the stream network. A volumetric index is developed by integrating the regression equation which relates channel capacity to total stream length between network limits. This measure of the volume of the network is illustrated for two basins in New South Wales, Australia, which have different drainage densities but comparable network volumes. The index is also employed to demonstrate the reduction in channel volume to 58 percent of that expected, downstream from a reservoir in Yorkshire, England, and to indicate the increase of channel volume to 1.9 times the expected value downstream from an urban area in Yorkshire.

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