Question

Which of the following is a permanent gully control structure?

• A. Loose rock dam
• B. Brush wood dam
• C. Drop spillway
• D. Woven wire dam

Hint:

In gully control, permanent structures like drop spillways, chute spillways, and check dams are used for large, active gullies where stabilization is critical. Temporary structures are for smaller gullies or to support the establishment of vegetation.

Answer 1

The Correct Option is C

Step 1: Differentiate between temporary and permanent structures. Gully control structures are classified based on their design life and construction materials. Temporary structures are low-cost, have a short lifespan, and are typically used for small gullies or as initial measures. Permanent structures are made of durable materials like concrete or masonry and are designed for long-term stability.
Step 2: Classify the given options.
- Loose rock dams, brush wood dams, and woven wire dams are all considered temporary or semi-permanent structures. They are designed to slow down water flow and trap sediment, eventually creating conditions for vegetation to establish.
- A drop spillway is a permanent structure, typically built from reinforced concrete. It is designed to safely convey water from a higher elevation to a lower one without causing erosion, providing long-term gully control.