ما الفرق بين السد والسدة

The difference between a dam and a weir is that a dam is built on rivers and valleys to control floods, provide fishery wealth, and generate electricity. A weir, on the other hand, acts as a low-head water reserve dam and consists of a number of large gates through which water passes. Dams serve multiple purposes such as flood control, water storage, and electricity generation, while weirs are specialized structures primarily used for water control and regulation. Both structures play important roles in water management and resource utilization.