丘陵地区河沟两侧大多为田地,每年会积累大量秸秆杂草。应组织人员汛期前对河床与径流区域内的枯枝、杂草以及村镇内河边的柴草进行清理,以免随洪水下流堵塞村庄中的桥涵孔洞,影响泄洪。除了江河流域性大洪水外,近些年我国山区洪水造成的人员伤亡和经济损失愈显突出,有的年份因山洪灾害造成的死亡人数甚至占到了洪水 Hilly areas on both sides of the ditch mostly fields, each year will accumulate a large number of straw weeds. Before the flood season, staff should be organized to clean up the dead branches and weeds in the riverbed and runoff area as well as the firewood on the riverside in the villages and towns so as to prevent the overflow of flood and floodwater from blocking the holes of bridges and culverts in the villages with the downstream of floods. In addition to major floods in river basins, the casualties and economic losses caused by floods in mountainous areas of our country have become even more conspicuous in recent years. In some years, the number of deaths due to flash floods has even reached the level of floods