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8. Hydrographs

A hydrograph is a plot (or paired time-discharge values) of discharge versus time for a location (on a stream).

An idealized hydrograph has

• Rise portion

• Peak portion

• Recession portion

• Inflection point The hydrograph pictured also has a baseflow component

• Flow in absence of a storm

Direct Runoff Hydrograph

Baseflow Component

References

cite pages of textbook

1. Cleveland, T. G. (2015) Surface Water Hydrology Notes (Unit-Hydrographs Analysis) to accompany CE-3354, Department of Civil, Environmental, and Construction Engineering, Whitacre College of Engineering.

2. Cleveland, T. G. (2017) Surface Water Hydrology Notes (Unit-Hydrographs in HEC-HMS) to accompany CE-3354, Department of Civil, Environmental, and Construction Engineering, Whitacre College of Engineering.

3. FHWA-NHI-02-001 Highway Hydrology Chapter 6, Section 6.1

Spreadsheets

Listed below are spreadsheets that implement simple UH examples. They are Excel (circa 2009) spreadsheets, that work in current Excel, LibreOffice, and Numbers environments

1. ExampleUH_BackSub1.xls

2. ExampleUH_BackSub2.xls

3. ExampleUH_LeastSquares.xls

4. ExampleUH_TransferFn.xls

5. ExtendedBase_DifferentStorm.xls

6. ExtendedBase.xls

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7. Surface-Runoff Mechanics

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8.1 Baseflow Separation