COMPARISION OF MONTHLY STREAM FLOW MODELS

Abstract

Hydrologic data ue most important in all the water resources projects. Generally, hydrologic data of sufficient long period is not available. The generation of long period synthetic streemflow data is potentially of great use in the design of water resources systems. This is due to this ability, these data give to study the response of real systems to seque-nces of streailmflow other than the one simple otherwise availa-ble i.e. historic record, which is of limited use in the design situation. Data generation procedures are used to provide, equally likely flow sequences to the historic one in capacity yield analysis. The synthetic sequences give the designer a qualita-tive picture of the probability of failure, storage, relation in simulation studies. Models used to generate synthetic seq-uences depend greatly on the time intervcls (yearly, monthly, daily or 'hourly) for which sequences of synthetic streanflow are required. Over the, past decade a no. of models have been The developed for the generation of monthly flew for ' , _. design and operation of water resources systems. The models can be broadly classified as univariate and multivariate models, in univariate models the flow is generated at a single site ind.e- pendently, while in multivariate models simultaneous sequences of flow at various sites under consideration are generated.