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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Special sessions : Determination of the hydraulic efficiency of intake structures like grate inlets and screens in supe...
Determination of the hydraulic efficiency of intake structures like grate inlets and screens in supercritical flow
Author : SVENJA KEMPER(1) & ANDREAS SCHLENKHOFF(2)
ABSTRACT
Regarding the increasing number of extreme rainfall events there is a need of determining the hydraulic efficiency of
existing grate inlets and improving these in order to take as much as possible of the storm water (note: ití»s not feasible to
catch the whole runoff). In order to investigate and improve the hydraulic efficiency of street inlets, several physical and
three-dimensional numerical test runs were done. Beside the total opening area of the grate, the shape and arrangement
of the bars lead to different hydraulic performances. Within the presented study the bars are positioned in a 90 degree
angle to the flow direction. Compared with the performance of coanda screens within supercritical flow conditions the
shape of the bars is varied. Typical bar openings of 36 mm and bar widths of 32 mm were considered as well as the
number of the bars regarding the total length of the inlet. Different shapes like a triangular or rectangular cross section
were tested. In the physical model the bars fixed on a frame were put in an opening in a tilting flume. The discharge
characteristics are then described by the Froude number controlled by the discharge and the slope of the flume
(longitudinal as well as transverse).
File Size : 1,668,026 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Special sessions
Date Published : 12/08/2015
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