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1985年4月25日和5月4日,四川理县城区以东2公里多,杂谷脑河右岸的日底寨沟先后发生两次粘性泥石流(容重变化在1.8—2.3吨/米~3),阻塞流量120多秒立米的杂谷脑河,回水至打色尔沟口,长500多米,淹没成(都)阿(坝)公路长300多米,水深0.7—1.7米,公路道班和理县公路养护段大院部分被淹。泥石流堵河形成一个临时水库,蓄水约11万立方米。堵坝溃决后,大量泥沙冲下,使堵坝下游25米左右的成阿公路桥下河床很快垫高1—2米,威胁到桥的安全。桥东端下游沿岸的理县党校等单位,既受溃决洪水危害,又受日底寨沟泥石流出山口后可能改道的威
On April 25, 1985 and May 4, 1985, more than 2 km east of the urban area of Li County, Sichuan, there were two viscous debris flows at the end of Zhaigou, the right bank of Zagunao River (the bulk density varied from 1.8-2.3 tons / m 3 ), Blocking the flow of more than 120 seconds of stereotypes Zagunao River, back to the water to play Ergou Mouth, more than 500 meters long, submerged into (a) A (dam) Highway 300 meters long, 0.7-1.7 meters deep, Lixian highway maintenance section of the compound was flooded. Debris flow blocking the river to form a temporary reservoir, water storage of about 110,000 cubic meters. Blocking dam after the collapse, a large number of sediment washed down, so that dam downstream 25 meters into the A highway bridge quickly raised 1-2 meters, threatening the safety of the bridge. Bridge County downstream of the county party schools and other units along the coast, both by the flood damage, but also by the end of Zhaigou debris flow out of the pass may change after the Granville