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1991年6月5～10日,米脂全县降雨137.3mm,其中6月7日,34min内降雨60mm,使该县18.3％的淤地坝冲毁,50％的梯田遭受不同程度的损坏,洪水造成直接经济损失达2 471.4万元,占1990年全县农业总收入的70.5％。泉家沟、对岔、高家沟树木园等重点村,重点治理流域,工程安全无恙,基本达到土不下山,水不出沟。他们的主要经验:坚持集中连片综合治理;坚持高标准高质量;坚持工程措施与生物、耕作措施紧密结合;坚持新修与养护并重。今后的防御对策:进一步发挥水土保持系统工程的综合作用;建立高效多功能的水保体系;提高质量;积极开发主导产业;合理利用陡坡地。
From June 5 to June 5, 1991, the whole county of Mizhi County had a rainfall of 137.3mm, of which rainfall of 60mm occurred within 34min on June 7, causing 18.3% of the silt dam in the county to be destroyed and 50% of the terraces suffered different degrees of damage. The flood caused direct economic losses of 24.714 million yuan, accounting for 70.5% of the total agricultural income of the county in 1990. Quanjiagou, the fork, Gao Jiaogou Arboretum and other key villages, focusing on the management of the basin, the project safe and sound, basically reached the bottom of the earth, the water does not ditch. Their main experience: adhere to the integrated contiguous management; adhere to high standards and high quality; adhere to engineering measures and biological, tillage measures in close contact; insist on both repair and maintenance. Future defensive measures: to further develop the integrated role of soil and water conservation systems engineering; to establish an efficient and multi-functional water and soil conservation system; to improve quality; to actively develop leading industries; and to make rational use of steep slopes.