The hydraulic roughness of vegetated channels - interim report

The growth of weeds in rivers and canals is an ever present problem. In many existing waterways, the consequences of the weed growth will have been learned by experience. However, there are a number of situations where a prediction of the effect of weed growth is required. Intermittent flow over grass has been widely studied in the field and in the laboratory but comparable information on aquatic weeds, which are much more varied in form, is not readily available for general application. The purpose of this Commission is to extend knowledge in this field.