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Which of the following will pose difficulties in adopting U.H.G. principles and processes in evaluating flood hydrographs of basins? 1. non-uniform real distribution within a storm 2. Intensity variation within a storm 3. The centre of the storm varies from storm to storm in case of large catchments 4. Dividing into a number of sub-basins and routing the individual DRHs through their respective channels to obtain the composite DRH at the basin outlet 5. Large storages within the catchment

Which of the following will pose difficulties in adopting U.H.G. principles and processes in evaluating flood hydrographs of basins? 1. non-uniform real distribution within a storm 2. Intensity variation within a storm 3. The centre of the storm varies from storm to storm in case of large catchments 4. Dividing into a number of sub-basins and routing the individual DRHs through their respective channels to obtain the composite DRH at the basin outlet 5. Large storages within the catchment Correct Answer 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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