Group 1 - The project marks the commencement of the underground tunnel excavation phase for the Hangjia Lake South Drainage West Channel Expansion Project, with the first shield machine "Xianxing" successfully starting its operation [1] - The shield machine is approximately 90 meters long, weighs about 2500 tons, and has a diameter of 12.1 meters, designed to excavate a 5-kilometer underground tunnel [1] - The assembly of the shield machine involved over 12,000 components and was completed in 88 days, showcasing the efficiency of the municipal water group [1] Group 2 - The project aims to enhance flood control and drainage standards in the western region of Hangzhou from a 20-year to a 50-year occurrence level [2] - The construction includes multiple water inlets and a Y-shaped underground drainage channel, which is 29 kilometers long and buried 55 meters underground [2] - The drainage capacity is designed at 250 cubic meters per second, with a backup capacity of 300 cubic meters per second [2]