Comparative Study Of Methodologies To
Determine Inlet Efficiency From Test Data:
HEC-12 Methodology Vs UPC Method
Author(s)
M. Gómez & B. Russo
Abstract
The hydraulic capacity of a storm drainage inlet depends upon its geometry as
well as the characteristics of the gutter flow. Inlet capacity governs both the rate
of water removal from the gutter and the amount of water that can enter into the
storm drainage system. Inadequate inlet capacity or poor inlet location may cause
flooding on the roadway resulting in a hazard to pedestrians. Actually, the most
important reference that allows the estimation of inlet hydraulic capacities is the
known HEC-12 procedure, but it was elaborated for some different types of grate
and its use is limited to these. In recent years the Department of Hydraulic,
Maritime and Environmental Engineering (DEHMA) of the Technical University
of Catalonia (UPC) has carried out a new methodology that is always usable for
every type of grate and every type of street geometry that could be applied to
inlets not previously tested but similar to those used in the experimental
campaign
A comparative study between these methodologies was carried out and this
demonstrated the similarity of the results in terms of captured flow according to
the roadway flow. In particular, the hydraulic efficiency of a specific grate (P-
50*100) was studied according to the two methodologies and the results showed
that for the same roadway flow the two functions are similar up to 120 l/s
approximately and then the UPC methodology gives smaller values of efficiency.
Keywords: inlet interception capacity, gutter flow.
Keywords
inlet interception capacity, gutter flow.
Related Book
Other papers in this volume
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