|
The terrains of Taiwan are mostly constituted of hills and mountains while residential and commercial developments are concentrated in the sparsely scattered plains and basins. In terms of Greater Taipei area, topography investigations reveal that low-lying land areas at elevation below 20 meters are approximately 243 square kilometers. Yet owing to centralization of politics and economy as well as the convenience of transportation systems, the metropolis develops industry and commerce prosperities and also a dense population of six million and five hundred thousand. Due to the river characteristics being short, steep and fast- flowing, when typhoons and torrential rain attack the city, the floods rapidly surge into the sea. If it happens to be at high tide, the flood will backflow and is unable to drain away. Therefore the frequent flooding troubles, such as typhoon “Nari”, caused loss of human lives and properties and heavily damaged the economy. The commonly used flood prevention process is to build dikes along the river banks to contain the flooding. As corresponding solutions, flood prevention pumping stations are also established in densely populated industry, commercial and residential districts to drain the water when in urgent flooding conditions. In light of urban drainage system, the pumping stations are the last defense lines of the flood prevention frontier. Therefore the performance of pumping operations will definitely determine the risks and scales of the flooding in the metropolis. This research plan is focusing on the Jilong river banks where flooding occurred frequently to analyze the correlations between floods and the operations of established pumping stations in order to discern the critical management of pumping stations and to locate possibly ignored details and, furthermore, to provide the authorities with improvement solutions to reduce the damages caused by the floods to the least.
|