1. Background: The Caogong Canal was originally constructed in the 17th year of the Daoguang Emperor's reign during the Qing Dynasty (1837) and irrigates an area of 6,000 hectares. The canal diverts water from the Gaoping River using a ground sill structure. However, this structure was severely damaged by sediment-laden heavy rains brought by Typhoon Morakot in 2009, Typhoon Fanapi in 2010, and Typhoon Nanmadol in 2011, which caused significant changes to the topography and landscape. Although part of the structure was repaired on April 26, 2012, a 560-meter section (0k+660 to 1+660) experienced downstream scouring, and the energy dissipation blocks between 1k+166 and 1k+306 (140 meters in length) remained unrepaired. To ensure a stable environment for agricultural production, it was deemed urgent to restore the bed stabilization structure.

(Pre-construction photos)	(Construction photos)

2. Function: This project was carefully planned to restore the efficient use of water resources from the Gaoping River. It aims to mitigate the impact of floods and ensure a stable water supply for the irrigation district, thus supporting agricultural development. The project also integrates river management and water intake functions to create a secure and ecologically sustainable water diversion system.
3. Total Project Cost: NT$89,652,264
4. Construction Period: January 6, 2014 – April 5, 2015
5. Project Benefits and Irrigated Area: The ground sill structure had suffered severe scouring due to typhoons, resulting in damage to the main structure and disconnection between the foundation blocks. The riverbed also experienced progressive scouring, weakening the connection between the structure and the riverbed, increasing the risk of headward erosion and making the downstream area prone to future collapse. After restoration, the improved connection between the foundation blocks has increased the stability of the structure. Additionally, the placement of specially shaped blocks downstream has reduced severe scouring of the riverbed, effectively preventing future collapse. This ensures a steady supply of irrigation water for 6,000 hectares of farmland.