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20 0 1年 6月 15日凌晨 6时 10分到 7时 40分 ,罗玉沟流域遭遇了 3 0 0年一遇的特大暴雨袭击 ,暴雨中心点雨量68 8mm ,历时 5 5min。洪水破坏农田 3 3 0hm2 多 ,冲毁民房 2 0多间 ,受灾户 10 5户 ,直接经济损失达 2 0 0多万元。实测洪水含沙量达 43 2 1kg/m3,流失泥沙约 3 6 5 3万t。土壤流失主要来自于坡耕地和其他坡地 ,其流失量约 3 4 83万t ,占土壤流失总量的 95 % ;水保措施遭破坏、工程建设中的弃土弃渣 ,均加剧了土壤流失。应加强流域内沟道防治措施建设 ,加大流域退耕还林还草力度 ,实施大面积封禁治理
On June 15, 2001, from 6.10 am to 7.40 am, the Luoyugou catchment hit a severe torrential rains in 2003, with a rainfall of 68 8 mm at the center of the storm, which lasted 55 min. The flooding destroyed more than 300hm2 of farmland, destroyed more than 20 houses and affected 105 households, with a direct economic loss of more than 200,000 yuan. The measured flood sediment amount reached 43 2 1kg / m3, and sediment loss was about 36.53 million t. Soil loss mainly comes from sloping farmland and other slopes, with a loss of about 34.83 million tons, accounting for 95% of the total soil loss; destruction of soil and water conservation measures and abandonment of spoil during construction have aggravated soil erosion . We should strengthen the construction of channel prevention and control measures in the basin, increase the intensity of returning farmland to forest and grassland, and implement a large-scale closure ban management