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Pick two of the five assumptions that are required to apply the unit hydrograph to a...

Pick two of the five assumptions that are required to apply the unit hydrograph to a watershed. For each assumption, state what it is, describe it, and give an example of how that assumption might be violated in the real world.

Engineering   Civil-Engineering   
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Answer #1

1) Time invariance - it means that for a given effective rainfall and catchment, direct run off hydrograph (DRH) will always be same irrespective of when it occures.

Real world voilation -with season sometimes basin characteristics changes, that lesds to change in rainfall pattern so in the DRH but as per the assumption DRH will be same for given catchment.

2) Uniform effective rainfall - in derivation of unit hydrograph it is assumed that rainfall is uniformly distributed over the catchment basin.

Real word voilation - rainfall is not uniform in a catchment most of the time.

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