style="line-height: 20px;">Abstract: A tracer experiment using Rhodamine WT dye was carried out to measurelongitudinal dispersion in a 14-km reach of the River Severn in Wales, U.K. Theriver’s discharge was measured at six points and the depth, width andcross-sectional area were measured at 86 points along the test reach. Thechannel geometry was close to being statistically uniform. Discharge andvelocity were both nearly constant. Dye concentrations were recorded at stationsbetween 210 and 13775 m downstream of injection. Dye was injected over ashort interval as a near-uniform line source across the channel. Theseconditions make the data useful for testing mathematical theories of dispersion.They are presented in full. style="line-height: 20px;">Keywords: Channels; dispersion; tracers; River Severn
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