Determination of unit hydrographs by multiple storm analysis

B. Zhao*, Yeou-Koung Tung, J. C. Yang

*Corresponding author for this work

Research output: Contribution to journalArticle

4 Scopus citations


This paper discusses the derivation of a unit hydrograph by multiple storm analysis using least squares methods. Variations of least squares method was generalized using the framework of weighted ridge analysis. The paper also shows two theorems to support using multi-storm analysis to derive UH. In addition, an issue was addressed on the scaling effect in the conventional multi-storm analysis which could create potential bias toward large storms in deriving a multi-storm UH. For that, a simple scaling procedure was proposed to reduce such potential bias problem. Numerical investigations were conducted to examine the performance of the scaling procedure by comparing with the conventional multi-storm analysis (without scaling) and the HEC-1 weighing procedures. Based on various performance criteria using a total of 39 storms from three watersheds, the proposed scaling procedure was found to produce a quite desirable UH.

Original languageEnglish
Pages (from-to)269-280
Number of pages12
JournalStochastic Hydrology and Hydraulics
Issue number4
StatePublished - 1 Dec 1994


  • Unit hydrograph
  • least square methods
  • regression analysis

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