Petrus Syariman


Highways are often damaged by excessive water content below road surface. The road section between
Palimanan - Jatibarang, West Java is an area often flooded particularly at left and right sides of road. To
prevent floods, a study on these ditches had been implemented to determine the dimension of a ditch
proportional with hydrological conditions in its vicinity. The method applied in this study had been the
mapping of detailed highway situation, rainfall intensity analysis, design flood analysis, and flow discharge
simulation using a HEC-HMS model. Study results showed that flow discharge passing through the out-let
drainage is 3.88 m3/sec and 6.29 m3/sec respectively, for a return period of two and five years. With a flow
velocity assumption of 1.2 m/sec and a cross sectional area of out-let drainage on site of 3.19 m2, inundation
time at vicinity of out-let is respectively four hours for a return period of two years, and six and half hours for a
return period of five years. The average cross sectional dimension recommended for a return period of two
years is 1.36m x 2.0m, and for a return period of two years, 2.0 m x 2.0 m.


Road surface, flood, ditch, flow discharge, inundation time


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