Hydrometeorology is a combination of two sciences Meteorology and Hydrology. It is science dealing with the atmosphere and land phase of the water cycle with emphasis on the interrelationships between meteorology and hydrology in providing scientific and technical bridges between them. Hydrometeorology is defined as the study of the atmosphere process that affects the water resource of the earth. It is concerned with the study of the atmosphere condition and the land surface of the hydrologic cycle with the emphasis on the inter-relationships. The basic meteorological elements for hydrometeorology are the characteristic of rainfall means its intensity, duration and frequency, air temperature, wind speed, sunshine duration and intensity and cloud coverage of the sky the major factor on water resource