Measurement of Débris-Laden Stream Flow with Critical-Depth Flumes

Heavy burdens of erosion debris in streams of the San Dimas Experimental Forest, in California, have been found to cause substantial errors in measurements of discharge at some of the gaging stations. Stream-flow records are kept at a number of points·throughout the Experimental Forest. Furthermore, there are two sets of triplicate water-sheds, each shed having an area somewhat less than 100 acres, immediately below each of which is located a Parshall flume, a V-notch weir, a small reservoir, and a flat-crested weir over the dam forming the reservoir.