Rainfall-Runoff Characteristics of Rangitaiki and Whirinaki Watersheds

by A. R. Rao, Purdue Univ, West Lafayette, United States,

Document Type: Proceeding Paper

Part of: Structures for Enhanced Safety and Physical Security


The Rangitaiki and Whirinaki watersheds in New Zealand have considerably higher storage and infiltration rates than others in New Zealand. The Rangitaiki watershed is flat compared to the hilly Whirinaki watershed. The runoff from these watersheds are affected by the differences in topography and soil characteristics. The stochastic characteristics of weekly and monthly runoff from these watersheds were analyzed and the results are reported in this paper. The weekly and monthly mean, standard deviation, skewness and kurtosis, the correlograms and spectra of the Rangitaiki and Whirinaki flows are presented. The rainfall-runoff cross correlation characteristics are investigated. Stochastic models for the weekly and monthly flows are developed and discussed.

Subject Headings: Watersheds | Rainfall-runoff relationships | Runoff | Stochastic processes | Rain water | Soil properties | Infiltration | New Zealand | Oceania

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