Spot gauged flows on the lower River Frome, Dorset, April-November 2022

Measurements were taken by dividing the river channel into at least 10 equally spaced transects, with the depth and flow velocity recorded at each vertical transect. For small streams (< 3 m width), 5-10 transects were used. The flow velocity was recorded at a depth of 40% above the riverbed. The cross-sectional area for each transect was determined by multiplying the width of the transect by the average depth of the two adjacent vertical transects. This was then multiplied by the average velocity of the two adjacent vertical transects to get discharge for each transect. The sum of all transects provided total stream discharge. To conduct the measurements, a Valeport mechanical flow meter was used. Flows are reported as m3 s-1. Due to time constraints only one flow recording could be taken at each site, on each survey date, i.e. no replicates.