杩 Croucher is a water holding facility with logs tied into a tripod, also known as \"closed water triangle\
杩 croucher is also used to regulate the water volume, pick up the current bank protection, protect the bridge sluice and weir and rescue closure. \"Dujiangyan Water Conservancy Records of Guanxian County\" reads: \"Kangxi Ding Youyou year (1717), July, summer rain more than month... The river is swollen... Burst the new river, weave bamboo as a cage, store stones to block. On the second and third of August... On the first five days to return to the water 杩...... There are hundreds, and the water dries up.\"
Dujiangyan tripod is called 杩 Cha, which is a water holding facility with logs tied into a tripod, also known as \"closed water triangle\