Stochastic Hydrology and Hydraulics

, Volume 11, Issue 2, pp 145–171 | Cite as

Regionalization of unit hydrograph parameters: 1. Comparison of regression analysis techniques

  • Y. -K. Tung
  • K. -C. Yeh
  • J. -C. Yang


Hydrologic regionalization is a useful tool that allows for the transfer of hydrological information from gaged sites to ungaged sites. This study developed regional regression equations that relate the two parameters in Nash's IUH model to the basin characteristics for 42 major watersheds in Taiwan. In the process of developing the regional equations, different regression procedures including the conventional univariate regression, multivariate regression, and seemingly unrelated regression were used. Multivariate regression and seeming unrelated regression were applied because there exists a rather strong correlation between the Nash's IUH parameters. Furthermore, a validation study was conducted to examine the predictability of regional equations derived by different regression procedures. The study indicates that hydrologic regionalization involving several dependent variables should consider their correlations in the process of establishing the regional equations. The consideration of such correlation will enhance the predictability of resulting regional equations as compared with the ones from the conventional univariate regression procedure.

Key words

Hydrologic regionalization unit hydrograph regression analysis multivariate regression seemingly unrelated regression validation 


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Copyright information

© Springer-Verlag 1997

Authors and Affiliations

  • Y. -K. Tung
    • 1
  • K. -C. Yeh
    • 2
  • J. -C. Yang
    • 2
  1. 1.Wyoming Water Resources Center & Statistics DepartmentThe University of WyomingLaramieUSA
  2. 2.Department of Civil EngineeringNational Chiao-Tung UniversityHsinchuTaiwan, Republic of China

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