30
Read the following statement regarding recession limb of unit hydrograph
(A) . It extends from point of inflection at the end of the crest segment to the commencement of the natural groundwater flow
(B) . The starting point of recession limb represents the condition of maximum storage
(C) . The recession limb is also called as concentration curve
(D) . Shape of recession limb depends on storm as well as basin characteristics
Choose the correct answer from the options given below:
EXPLANATION
Stream Gauging & Hydrograph Analysis
- Recession Limb Characteristics of a Unit Hydrograph:
- Extent of recession limb: Extends from the point of inflection on the falling side of the crest segment down to the commencement of baseflow groundwater recession. (Correct)
- Maximum basin storage: The inflection point at the top of the recession limb marks the cessation of effective rainfall inflow; storage within the watershed is at its maximum and the recession represents pure drainage of stored surface and subsurface detention. (Correct)
- (C) Concentration curve: The rising limb is called the concentration curve, not the recession limb. (Incorrect)
- (D) Dependency: The recession limb is predominantly independent of rainfall storm characteristics, depending almost exclusively on physical basin geometry and channel storage parameters. (Incorrect)
- Conclusion: (A) and (B) only (Option 4).
Correct option: (4) (A) and (B) only.
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