Question

The design velocity of flow in a grassed waterway is 2.0 m/s, then the cover condition should be:

• A. Good Grass Cover
• B. Sod of Excellent Cover
• C. Sparse Grass Cover
• D. No Vegetation

Hint:

Dense vegetation stabilizes grassed waterways, preventing erosion at high velocities.

Answer 1

The Correct Option is B

Step 1: Understanding Grassed Waterways
Grassed waterways prevent soil erosion by slowing down runoff.
Step 2: Evaluating Cover Conditions
- Good grass cover: Supports moderate flow. - Sod of excellent cover: Supports high-velocity flow (2.0 m/s). - Sparse grass cover: Unsuitable for high velocity. - No vegetation: Leads to erosion.
Step 3: Conclusion
For 2.0 m/s flow, sod of excellent cover is needed.