Sediment Basins with Slotted Riser Outlets: An Evaluation

摘要

An evaluation of sediment basins formed by installing slotted risers on existing highway culvert inlets along State Route 299 in Trinity County, near Redding, California is documented. Grain sizes of the sediment retained in the basins and of sediment that passed through the slotted risers during storms were measured. The sediment is decomposed granite. The volume of retained sediment was measured four times from the time the basins were built in 1978 to 1983. Hydraulic operating characteristics were observed during two storms in January, 1983. This is a follow-up study to a previous Caltrans project entitled 'Sediment Accumulation at Highway Culverts Modified with a Slotted Pipe Riser on Inlet'.