order to divert the water to irrigate the cehngdu plain, li bing had the hard rocks cut off.but at that time the explosive had not been invented and there were no modern machines, how did li bing manage to do so? he had fire lit under the rocks to heat them up, then poured cold water onto the hot rocks.by this way the rocks cracked and split.after 8 years of this tough work, a channel of 20m wide was formed.
飞沙堰溢洪道位于金刚堤底部与人字堤之间，宽200米，高2.15米，是都江堰水利工程最重要的组成部分 。在枯水季节，当水位低于2.15米时，就引水灌溉成都平原 。洪水季节时，当水位高于2.15米时，多余的水就会通过飞沙堰泄到外江 。此外，飞沙堰还有一个重要的作用就是排沙 。
feishayan spillway lies between the end of jingang levee and renzi levee.it is about 200 meters wide and 2.15 meters high from the bottom to top.it is the most important component of dujiangyan irrigation project.in dry season, when the water level is lower than 2.15 meters, it leads water into the baopingkou to guarantee irrigation.in rainy season, when water level is higher than 2.15 meters, exceive water is discharged into outer river.the third function of the spillway is to discharge sand.
鱼嘴分水堤位于岷江中心，因形似鱼嘴而得名 。它将岷江一分为二 。外江是自然河道，其作用是在雨季排泄大量洪水 。内江是李冰人工挖掘的河道，其作用是引水灌溉成都平原 。李冰修建内江时，挖的比外江深，枯水季节，四成的水进入外江，六成的水进入内江，保证成都平原的春耕用水 。洪水季节时，水位上深，由于外江比内江要宽，因此六成的水进入外江，四成水进入内江，避免成都平原遭受洪水侵害 。由于鱼嘴也是位于弯道，利用弯道环流原理，夹杂大量泥沙的底层水将八成沙石抛向外江，而进入内江的泥沙只有二成 。yuzui dividing dyke lies in the middle of minjiang river, the front part of which reaches down into the river, looking like a fishs mouth, thus it is called fish mouth.it divides minjiang river into two parts: the outer river and the inner river.the outer river is a natural river course, whose main function is to drain floods during rainy seasons.the inner river was manmade.it carries river water to chengdu plain for irrigation.when people dug the inner river, he made it much deeper than outer river.in dry season, 60% of the water goes to inner river to guarantee irrigation and 40% to outer river.however, outer river is much wider than inner river.in rainy season, 60% of the water goes to outer river and 40% to inner river, preventing chengdu plain from the flood.with the same working principle as feishayan, the yuzui dividing dyke can discharge 80%of sand into the outer river.thus, only 20% of sand enters the inner river. 参考网站：/2.锦里
jinli ancient street
锦里是西蜀历史上最古老、最具商业气息的街道之一，早在秦汉、三国时期便闻名全国 。锦里古街依托成都武侯祠，北邻锦江，东望彩虹桥，以秦汉、三国

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