Which human-made structure is designed to inhibit or control river water flow?

Which human-made structure is designed to inhibit or control river water flow?

• A. Dams
• B. Levees
• C. Canals
• D. Reservoirs

Answer: (A)

Controlling river water flow is achieved by structures that directly obstruct or regulate the water’s passage. A dam is built across a river to block the channel, raise the upstream water level, and release water in a controlled way through gates or turbines. This combination of obstruction and regulated release slows, stores, and modulates flow, creating a reservoir behind the dam that serves purposes like flood control, irrigation, and power generation.

Levees, on the other hand, are raised banks along a river designed to keep floodwaters from spilling onto adjacent land; they don’t actively inhibit the flow of the river itself. Canals are engineered waterways that move water from one location to another, often changing its direction, rather than directly blocking or regulating the natural discharge. Reservoirs are the stored water behind a dam, not the structure that controls flow on its own.