Suspended sediment in the Rivers Tweed and Teviot

Suspended solids concentrations were monitored over a 3-year period from April 1994 to March 1997 at two sites on the River Tweed and one on the Teviot, a tributary of the Tweed. Values of the median suspended solids concentration ranged between 6.6 and 8.0 mg ly1 for the three sites. The relationship between suspended solids concentration and flow varied both between years and by month, showing the influence of sediment supply and diatom growth. Estimates of the flux of suspended solids from the Tweed basin at the tidal limit ranged from 38 000 to 89 800 t yeary1, depending on the year. Converted into a yield, these values are at the lower end of the range of both published estimates and those for other LOIS rivers