Author(s): S. Kemper; A. Schlenkhoff

Linked Author(s): Andreas Schlenkhoff, Svenja Kemper

Keywords: Street inlet; Intake structure; Supercritical flow

Abstract: In order to localize inundation areas caused by heavy rainfall events, the capacity of street inlets (intake structure: connection between surface and underground drainage system) must be known. Physical as well as three-dimensional numerical model test runs were done to investigate the efficiency of common street inlets. The present paper deals with flow conditions of intake structures in detail. A numerical model with a simplified geometry of an intake structure (grate) with supercritical and turbulent flow conditions is used. The geometry consists of a rectangular channel with a longitudinal slope of SL=5.0% -7.5% and seven slots at the downstream end of the model (rectangular and triangular cross bars, slot width and cross bar width of 36mm). The upstream flow velocity v0 is between 1.0 m/s and 1.7 m/s with water depths h0 between 0.014 m and 0.025 m. An empirical approach is developed in the presented study to calculate the intercepted flow through each slot. The incoming velocity as well as the cross bar geometry can be found as the main influencing and limiting parameters on the discharge through the openings.

DOI: https://doi.org/10.15142/T3FP89

Year: 2018