2000 Volume 44 Pages 337-342
In developing countries, elevated roads on embankments that cross flood plains and approach roads to bridges which thrust out into river channels are often seen. Such structures interfere with flood flow, causing scouring around piers and soil embankments. One possible solution to this problem would be the construction of bridges completely over flood plains or rivers; however, this is not entirely realistic due to limited financial conditions in the affected countries.
When designing such roads and bridges, two facts must be taken into account: rivers are in their natural state (i, e., without flood control) and there is a high probability of floods occuring beyond a design flood discharge due to insufficient hydrological data. Design criteria in Japan cannot simply be applied to the local situation. In this paper, such problems actually occuring at individual locations are analyzed and feasible countermeasures are proposed from the point of view of river disaster prevention.
