The Chinese built dikes and levees along rivers to prevent flooding. The earliest dikes were built in the 11th century BC, and they were constantly improved and expanded over time. By the 13th century AD, there were over 100,000 kilometers (62,000 miles) of dikes in China. These dikes helped to protect millions of people from flooding.
Dredging rivers
The Chinese also dredged rivers to remove sediment and debris that could block the flow of water. Dredging was done using a variety of methods, including manual labor, animal-powered machinery, and water-powered dredging machines. Dredging helped to keep rivers flowing smoothly and reduced the risk of flooding.
Planting trees
The Chinese planted trees on riverbanks to help stabilize the soil and prevent erosion. Trees also helped to absorb excess water and reduce the risk of flooding.
Building reservoirs
The Chinese built reservoirs to store water during the wet season and release it during the dry season. Reservoirs helped to regulate the flow of water in rivers and reduce the risk of flooding.
Flood warning systems
The Chinese developed a flood warning system to alert people to potential flooding. The system was based on observations of water levels, weather patterns, and other factors. When a flood was predicted, people were evacuated to higher ground.