What is the topic of water conservation in Guangxi Hejiang Jiuqu?

Small water needs bricks, and flood needs stone sinus. According to the records of local treasures in Guangxi Province, the title of water in Guangxi Hejiang Jiuqu is a poem left by the ninth generation of officials, officials, second-class scholars and twelve scholars in Jiuqu Water. Small water is abundant in bricks and tiles, and large water is abundant in stone cow and stone sinus in Hejiang, which was called Heshui and Helinshui in ancient times. In Fengkai County, Guangdong Province, it is called Fengxi Sealing Water, which is famous for its dark green.