There are three sources, all of which are from Lu 'an County, and the north branch is called Sigutan River, which originates from Xiaochungang and flows southeast, passing through Fan 'an and crossing the main canal of Pihang. The length from Longhekou to Chaohu Lake is 6? Sigutan to Shuanghe Town; Is Zhongzhi called Chenjiahe? Also known as Zhangdian River), it originated in Ma Jian Porcupine Ridge and Hengtanggang of Phoenix Terrace, and flowed eastward. After the two small stocks meet in Zhangdian, they cross the Dashan aqueduct at the half pier and flow eastward to Beina Zhilongzui in Shuanghe Town. The south branch is called Zhangmuqiao River (also known as Xiaojie River), which originates from the riding hillock of Dashanzhai and flows northeast to the Donghekou. The water comes from the west, flows eastward through Nanguan Pavilion, and passes through Jiangjunshan Aqueduct to Longzui. The three branches meet at Longzui, and the following is the trunk of Fengle River, which is also the river at the junction of Shucheng and Feixi counties. Flowing eastward to Taoxi, the river is curved, and there is no dike in history. After the founding of New China, small dikes and levees were built along the river. After crossing Taoxi Bridge, it flows eastward through Xincang and sanhe town and joins Hangbu River at Datan Bay, with a total length of 1 17.5 km and a drainage area of 2,080 square kilometers. The reach from Shuanghe Town to Taoxi River is 27.37km long, with river bottom elevation15.4 ~ 7.9m, river bottom width10 ~ 20m and dam crest elevation of 24.5 ~19.0m.. The reach from Taoxi to Datanwankou is 3 1.55km long, with a river bottom elevation of 7.9 ~ 5.9 m, a river bottom width of 20 ~ 70 m and a dike top elevation of 24.5 ~ 14.5m ... The historical maximum discharge of Taoxi Station is 661m3/s (/kloc-0 The highest water level in history is17.43m (1July 969 15), and the lowest water level is1September 5, 9661m.