Hyetograph and Hydrograph Analysis

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EXERCISES

$3\mathrm{.}1$ Explain UH theory with its basic assumptions and applications.

$3\mathrm{.}2$ Describe the governing factors affecting the shape of the unit hydrograph. How is the UH different from the distribution graph?

$3\mathrm{.}3$ Describe the methods of UH derivation from rainfall$-$runoff data of an event.

$3\mathrm{.}4$ In Question $3,$ how is the conventional method advantageous over other methods? If the available rainfall$-$runoff data correspond to multi$-$period storms, which methods are suitable for deriving a UH of the desired duration?

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$3\mathrm{.}5$ Describe Collins' method. State the reasons for the occurrence of oscillating ordinates in the recession limb of the derived UH$.$ What are the procedures followed to do away with the oscillating ordinates?

$3\mathrm{.}6$ Describe the methods of single division and least squares for deriving a $UH$ and discuss their advantages and disadvantages.

$3\mathrm{.}7$ What are the unit period and volume of the UH$?$ State the theory for changing the unit volume of the UH of a specific duration.

$3\mathrm{.}8$ Describe $H$ and $S-$curve hydrograph and their relationship. How are these related with the $UH?$

$3\mathrm{.}9$ What is superimposition method and how is it advantageous over the $S-$curve method?

$3\mathrm{.}10$ Discuss various methods of averaging unit hydrographs.

$3\mathrm{.}11$ A thunderstorm of $1-hr$ duration with $20mm$ excess rainfall volume resulted in the following direct surface runoff $($DSRO$)$ hydrograph at the outlet of the catchment. Find out the $UH$ of $1mm$ excess rainfall volume and $1-$hr duration.

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