Question

differences between flood hydrograph and unit hydrograph

Answer 1

Answer:

Unit Hydrograph

An unit hydrograph (UH) is the hypothetical unit response of a watershed (in terms of runoff volume and timing) to a unit input of rainfall. It can be defined as the direct runoff hydrograph (DRH) resulting from one unit (e.g., one cm or one inch) of effective rainfall occurring uniformly over that watershed at a uniform rate over a unit period of time. As a UH is applicable only to the direct runoff component of a hydrograph (i.e., surface runoff), a separate determination of the baseflow component is required.

Flood Hydrograph

A flood hydrograph is a graph of two axis, 'discharge' and 'time'. Plotted on the graph is the amount of discharge over a period of time. By looking at a hydrograph, a lot of information and data can be. gathered about the river, the precipitation, the surrounding area and. vegetation etc.

Answer 2

The difference between Flood hydrograph and Unit hydrograph are as following:

Explanation:

Flood hydrograph:

• Flood hydrographs are graphs that show how a drainage basin responds to a period of rainfall.
• These graphs are used to plan the flood or draught situation in an area.
• They usually show the river discharge that has occured as a result of rainfall.
• It basically shows that how a river is affected by the storm with respect to time.

Unit hydrograph:

• Unit hydrograph is a graph for a specific time period of excess rainfall ( extra water runoff).
• It is basically a linear response function of watershed.
• A unit hydrograph shows the temporal change in flow per unit.
• In other words it can be said that how the flow of the steam will be affected overtime by the addition of one unit of runoff.
• It is very much essential in predicting the impact of rainfall on a stream.

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