Abstract

Flooding is a serious urban problem, especially in HoChiMinh city in recent years. Many researches for flow accumulation by terrain have been proposed. Accordingly, terrains are splitted to grids. Single or multiflow algorithms will theoretically show the accumulated water trend. So that, to reduce flooding, increasing road or extending drainage system is common work. However, the consider things is what will be influence and impact: locally or globally on the whole calculated areas. In this paper, the authors propose the firstly heuristics graph-theoretical spatial analysis algorithm to redirecting the flow for archiving the accumulation beyond one determined threshold value.