STUDY ON THE USE OF OBSTRUCTING OBJECTS TO DIFFUSE FLOOD WATER VELOCITY DURING ROAD CROSSING

Abstract

Laboratory experimental investigations were conducted to identify suitable shape and
dimension of objects as well as its capability to reduce flow velocity. The first stage of the study was to
identify suitable shape and its arrangement. In this test a scale of 1:20 was used in a flow table experiment.
The water flow pattern was recorded focusing on the distance and amplitude of the pattern as water flow pass
the obstructing objects. The second stage of the investigation involved a hydraulic model investigation. In
this investigation, the velocity reduction effects of the selected objects shapes were studied. The results are
classified into three distinguishable patterns of diffusion. Two objects shapes and arrangements selected for
use in the hydraulic model investigation indicated its capability to reduce flow velocity satisfactorily
consistent with the flow pattern in the preliminary findings.