United States Department of Transportation
i
Hydraulic efficiency of grate and curb-opening inlets under clogging effect.
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2012-04-01
[PDF-1.41 MB]
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Abstract:The goal of this project is to investigate the hydraulic efficiencies of Type 13 (bar inlets), Type 16
(vane inlets), and Type R (curb-opening inlets) for street and roadway drainage. Although these inlets
have been widely used in many metropolitan areas, the design empirical formulas and coefficients have
not been verified. In this study, a flume was constructed in the laboratory to simulate street gutter
flows ranging from 6 to 18 inch of flow depths. Type 13, 16, and curb-opening inlet models were built
using a 1/3 scale to investigate the depth-flow relations under both on-grade and in-sump conditions. It
was found that the flow interception capacity for a sump inlet is determined by either weir or orifice
hydraulics, whichever is less for the given flow depth. Two new splash-velocity curves were developed
to model the street gutter flow around a Type 13 or 16 inlet on a grade. In this study, a decay-based
clogging factor was developed and recommended for the design of a series of inlets. The clogging
effect shall be applied to the effective wetted length for an inlet that operates like a weir, or to the
effective opening area for an inlet that operates like an orifice in a sump.
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