Sewer main rainy Systems announced on urban supply routes in the size Rankings = 1 x (1, 3x1, 2) m to the rankings = 4 x (2, 0x2, 5) m and circular reinforced concrete culvert size from D = 1500-2500mm. -Drainage branch systems deployed on regional routes, internal road is circular reinforced concrete culvert size D = 600-1500mm
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