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Select the maps to a drainage is the most important stage in the city, because the drainage design, decided to drainage of the entire cost. It depends on many factors: the terrain, engineering geology, hydrogeology, detection of tri N levels in the city now and in the future......The city has nobumitsu mountainous terrain very complex territory is divided into city river backpack. At the same time, according to the watershed distribution of the main fish in the bone surface of the natural watershed.For this complex terrain, we propose two schemes for the drainage organization to consider:
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