THE EFFECT OF PLUGGING STORM PIPE CULVERT ON HEAD LOSS (II)

Mahmoud Ghonem, Magdy Mowafy, Amgad El-Ansary, Hamdy El-Ghandour

Abstract


Debris flows affecting highways and plugging a storm culverts always cause overtopping of the
road by sliding debris causing increase of the total head losses. The experimental study in this research
aims to examine the effect of the cross sectional plugging percentage on the total energy (total head)
loss. A storm pipe culvert was tested for five different discharges (Q=8.5 to 38.8 lit. /sec), different
submergence ratios (Y2/d = 1.0, 1.5, and 2.0), fixed longitudinal plugging length ((Lr) = 50%), and
different cross sectional plugging percentage (Ar = (0%, 10%, 30%, 50%). Results of the study
estimate the risk of road failure, predict implications of relatively high flows, and identify culverts that
need to be replaced. Increasing the cross sectional plugging (Ar) from 10% to 50% led to rise in the
increasing factor of the relative energy head loss by about 103 % at Y2/d=1.0, and by about 136 % at
Y2/d=2.0 with the average pipe Froude number Fp=0.41.

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