United States Department of Transportation
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Abstract:The goal of the present study was to determine the efficiency of a specific culvert geometry, labeled as
Index 216 Closed Flume Inlet (CFI) in the FDOT’s Design Standards, and to determine if geometric changes
affect the efficiency of the current design. The experimental study was initiated by testing the impact of
various changes to the Index 216 CFI geometry to determine the optimum configuration with respect to
hydraulic operation. The 4-ft unconstricted geometry was found to be optimal CFI configuration.
Subsequently, extensive series of tests were carried out to estimate the hydraulic performance of this
geometry for a wide range of settings and flow conditions. Final empirical relationships to predict the CFI
intercepted flow have been developed using analysis and visualization. While there are no references to
compare the results obtained in the present study, the hydraulic performance of the tested drainage structures
is aligned with the analytical inferences. Moreover, the trends of the results obtained herein are in agreement
with results of previous studies conducted on similar drainage structure geometry. Overall, it can be
concluded that: (i) increased cross- slopes convey more stormwater through the drainage structure for the
same longitudinal slope and (ii) decreased longitudinal slopes convey more flow through the drainage for
the same cross-slope. The efficiency of the drainage structures for larger cross-slope is modest while a sharp
decrease occurs for larger longitudinal slopes. The assessment of the CFI hydraulic performance also
includes the estimation of the self-cleaning velocity. It is observed that the self-cleaning velocity is exceeded
for all tested situations
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