A large number of rotten wood and broken branches and some garbage, with the erosion of rain, drift down the river, piled up in the middle of the pier, resulting in the blockage of the river, slow water flow and sudden reduction of water flow, not only affect the normal flood drainage, but also pose a threat to the bridge, there are security risks. At this time, a section of the river upstream of the bridge has accumulated a large amount of water, and the villagers' crops are planted on both sides of the river. Once the treatment is not timely, the drainage is not smooth and the rain continues to accumulate, the river may overflow, which will cause serious economic losses and unimaginable consequences !