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

Yeou-Koung Tung*, Keh-Chia Yeh, J. C. Yang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Scopus citations


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 water-sheds 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.

Original languageEnglish
Pages (from-to)145-171
Number of pages27
JournalStochastic Hydrology and Hydraulics
Issue number2
StatePublished - 1 Jan 1997


  • Hydrologic regionalization
  • Multivariate regression
  • Regression analysis
  • Seemingly unrelated regression
  • Unit hydrograph
  • Validation

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