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Doctors Medicines MCQs Q&A

  1. 1. 3 and 4 only
  2. 2, 3 and 4 only
  3. 1, 2 and 5 only
  4. 1, 2, 3 and 5 only
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1 Answers

Option 4 : 1, 2, 3 and 5 only

Concept:

Unit Hydrograph (UH): It is defined as the hydrograph of storm runoff resulting from an isolated rainfall of some unit duration occurring uniformly over the entire area of the catchment, produces a unit volume (i.e., 1 cm) of runoff.

Assumptions for generating unit hydrograph: 

  1. Uniform areal distribution within a storm: Rainfall intensity due to a particular storm is uniformly distributed throughout the whole catchment area.
  2. Intensity of rainfall is invariant within a storm: Rainfall intensity does not vary within the reach of the storm.
  3. Catchment does not have any large and concentrated storage.
  4. Superposition and addition of UH of a sub parts of catchment area with proper routing will produce the same UH if calculated considering the catchment area as a whole and one.
  5. In case of large storms when centre of storm is varying unit hydrograph theory is not valid and not applicable.

 

∴ Only statement 4 complies with the assumptions of unit hydrograph theory and rest of the statements do not. So, statement 1, 2, 3 and 5 will pose difficulties in adopting unit hydrograph principles.
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