① In June 65438+1October 065438+April 2005, the preliminary project of "three changes to two" mainly regulated 2. 1 km in the estuary of Gecko, that is, cut the beach and protect the slope at the estuary of Taian Town, Hanjiang District, widen the channel section, effectively reduce the cross-flow velocity and solve the problem of navigation suspension in flood season every year.
(2) From July 2006 to August 2008, this stage was called the second phase expansion project of the Beijing-Hangzhou Canal, mainly to expand the shiplocks along the route, especially some shiplocks with low capacity such as Shao Bo and Shiqiao. According to the planning and design scheme, Shao Bo and Shiqiao shiplocks were changed to three lines on the basis of two lines, which built a wide "road" for passing ships and played a role in diverting ships and alleviating traffic congestion.
③ From June 2009 165438+ 10 to April 20 10, this stage is called the "Three-to-Two" urban greening promotion project of Yangzhou section of the Beijing-Hangzhou Canal (hereinafter referred to as the "Beijing-Hangzhou Canal Greening Promotion Project"), which mainly solves the problem of green belts on both sides of the waterway in the "Three-to-Two" project. From the mouth of Huaisi ancient canal to Shiqiao lock, the canal with a total length of 10 km is covered with a green belt with a width of 6 meters, and the width of some key bank sections reaches 20 meters, which has become a beautiful landscape along the canal.