An evaluation of barriers to control sediment entering a curb inlet is completed. Hydrologic limitations are evaluated to determine what happens to the volume of water and accompanying sediment when significant runoff occurs from different soil types. Equations are presented to demonstrate the need for very low discharge values or large pond surface areas for effective control of sediment. Test results on sediment captured by gravel barriers placed in front of an inlet and using an inlet insert show deposition of only larger sized particles even when low flow rates exist. Evaluation of soil particles trapped by curb sediment traps showed nearly identical results as a barrier and insert. Based upon this analysis, it has been concluded that curb inlet barriers are not effective in controlling sediment in runoff waters when discharge values are high and have minimal effectiveness for low flow values.
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