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建国以来,我省修建了大量治河防洪工程,减轻了水患,对于保卫国民经济和人民生命财产安全,起了重要作用.但是,近十几年来,河道内人为地设置了大量行洪障碍物,降低了泄洪能力.因此,河道清障已成为防洪工作中一个亟待解决的问题.河道的泄洪能力是由河槽的过水断面、糙率及比降决定的.一般地说,河槽过水断面大,糙率小(河槽光滑),比降大,其泄洪能力就大,反之则小.
Since the founding of the People’s Republic of China, a large number of flood control projects have been built in our province to reduce flooding and play an important role in defending the national economy and the safety of people’s lives and property. However, in the past 10 years, a large number of flood- , So as to reduce flood discharge capacity.Therefore, river clearance has become an urgent problem to be solved in flood control.The discharge capacity of a river channel is determined by the cross-section, roughness and slope of the river channel.Generally speaking, Large, rough rate (smooth river channel), than the larger, its flood capacity is large, otherwise small.