This book is intended to serve as a medium for dissemination of scientific and technical information emanated from research on weather variability, soil and water resources to the world. It is aimed at providing technical guidelines to those who involved in the practice of soil and water engineering, Irrigation and drainage engineering, environmental science and engineering, farmers, field assistants, engineers, researchers, students and decision makers. It contains detailed scientific and engineering approaches to: Investigate and analyze the water use pattern within River basin; Evaluate soil infiltration potentials for agriculture; Assess the automobile effluents discharge on ground water quality; Investigate the effect of weather variability on millet and sorghum yield; Evaluate the effect of physico-chemical properties of soil on crop yield; and Assess the water quality of flowing river for irrigated agriculture.