Hydrological data processing and quality control of observations on rainfall and river flow : error calibration, a case study of Sungai Muda at Jeniang, Kedah: volume one / Muhammad Suhairi Abdullah

This study is to analyse the systematic compilation of data, analysis of error and calibration of data collected. Since hydrologic phenomena are mostly random in nature , their prediction cannot be done in absolute terms and hence some statistical method analysis is made to predict the frequency for any desired events or occurrences. Data obtained from measurement gauges of rainfall and river flow must represent the actual condition of the catchment area . There are some of external factors that influence the accuracy of the data such as the process of Infiltration , Transpiration and Evaporation which produce the percentage of error that might affect the accuracy of data. This study involves the collection of rainfall and river flow data of dairy, monthly and annual basis at the particular research area chosen , for this thesis the area chosen is Sungai Muda at Jeniang , Kedah . Using some particular methods the percentage of error can be calculated . Finally, possible sources of error are evaluated , and method is proposed for predicting the magnitude of error using data that are commonly available for severe, historic rainfall.