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Following are the statements regarding grassed waterways:
(A) . The Manning's coefficient of roughness is 0.04 for design
(B) . These are designed to carry maximum runoff from a storm of 10 years recurrence interval
(C) . These are constructed across the land slope to remove excess water.
Choose the correct answer from the options given below:
EXPLANATION
Fluid Dynamics & Vapour Compression
- Design Criteria for Vegetated Grassed Waterways:
- For hydraulic design of grassed waterways using Manning's equation, the roughness coefficient for dense retardance grass cover is taken as $n = 0.04$. (True)
- Grassed waterways are non-scouring open channels designed to safely carry peak runoff from a storm of 10-year recurrence interval. (True)
- Waterways are constructed along the natural drainage depression (along the slope), not across the land slope, to safely convey discharge downhill. (False)
- Conclusion: Statements (A) and (B) only are correct (Option 1).
Correct option: (1) (A) and (B) only.
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