In traditional perception, most dams are rigid giants cast in reinforced concrete. However, in modern water conservancy projects, there is a type of dam that subverts this cognition—it is the shield rubber dam. This hydraulic structure integrating flexible materials and intelligent control is widely applied worldwide due to its unique advantages.

As the name suggests, the core of an shield rubber dam is a large flexible dam bag made of high-strength synthetic rubber (such as nylon and polyester). Its working principle is ingenious and efficient:

• • When water storage is required, air or water is filled into the dam bag anchored to the riverbed through a control system. The dam bag then inflates and rises, like a flexible "shield" blocking the river channel to form the required water storage level.
• • When the flood season arrives or water discharge is needed, simply drain the medium inside the dam bag, and the entire dam body will collapse quickly, clinging closely to the riverbed. It barely hinders the passage of floods or water flow, rapidly restoring the river's natural flood discharge capacity.

This "moderate relaxation and tension" characteristic is the essence of the shield rubber dam. It perfectly balances the contradiction between water storage and flood discharge in traditional water conservancy. Compared with expensive steel gates, it has lower construction costs and faster construction speed; compared with completely rigid structures, it has better seismic performance and lower requirements for foundations. Its smooth curves can also blend harmoniously with natural landscapes, making it commonly used in urban landscape rivers, irrigation water diversion, ecological water supplement, and cascade hydropower development.

It can be said that the shield rubber damembodies the modern engineering wisdom of "overcoming hardness with softness". Instead of confronting natural forces head-on, it achieves the harmonious coexistence of humans and water resources through flexible and intelligent regulation, becoming a flexible "weapon" to protect the safety of rivers and lakes and empower urban and rural development.