1st International Conference on Rain Water Cistern Systems
Honolulu, Hawaii, USA - June 1982

Section 2: Rainfall Analysis

Page 83

Deterministic and Probabilistic Processes of Weekly Rainfall

Yu-Si Fok, Ronald H.L. Fong, Edwin T. Murabayashi and Andrew Lo
University of Hawaii at Manoa, USA

Introduction

In the design of rain water catchment cistern systems, the following design variables are considered essential:

1. Input (weekly rainfall) 
2. Catchment area (roof-top area) 
3. Storage capacity (cistern volume) 
4. Output (withdrawal/use).

Of these, the weekly rainfall is the only design variable that is uncontrollable and unpredictable. Thus, to design an adequate water catchment cistern system, the weekly rainfall must be estimated, using available statistical methods from existing rainfall records. In this paper, the deterministic and probabilistic processes of weekly rainfall data are discussed and presented for design purposes.

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