Hydrograph and Unit Hydrograph Analysis

  • Zekâi ŞenEmail author


In any flood prediction study, the most important tools are hydrographs that reflect the change of surface water flow discharge by time after each rainfall occurrence. These hydrographs are in the form of single peak curves, where the peak discharge value is one representation of the historical flood occurrences. In flood calculations, hydrograph concept and its various properties and features are important for successful applications. Various basic hydrograph concepts such as natural, unit, dimensionless, instantaneous, and synthetic are presented with relationships among them and the significance of each one for peak flood discharge calculations. Furthermore, starting from the simplest rational method for flood peak discharge calculation, various comparatively more sophisticated alternatives are also explained in detail among which are Snyder, the Soil Conservation Service (SCS), and geomorphological approaches. Finally, the most commonly used rational method irrationality is explained leading to innovative rational methodology for the first time in this book.


Instantaneous Irrationality Hydrograph Geomorphologic Rational Unit Synthetic Natural Soil conservation service Snyder 


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© Springer International Publishing AG 2018

Authors and Affiliations

  1. 1.Faculty of Engineering and Natural Sciences, Department of Civil EngineeringIstanbul Medipol UniversityBeykoz, IstanbulTurkey

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