Irrigation canal holds a key position in irrigation net work. Design parameters are selected on the basis of available data and past experience. Similar is the case for roughness co-efficient (n).With passage of time due to natural and living creature intervention, variation in the value of roughness coefficient may cause changes in water surface profile elevation and resultantly the discharge drawn by the irrigation outlets from the canal. In the present study the selected (design) value of roughness co-efficient for a lined distributary was verified and it’s affect on water drawing capacity of irrigation outlets was determinate and results are presented in this book.This book certainly enhance learning among researcher, scientists, students and farm mangers and helps planning research studies for the survival of humanity. The author appreciate the efforts of Barthlemy Chaton and his team in facilitating during book finalization and highly acknowledge publishing of this book by VDM Publishing House Ltd., for technical knowledge sharing internationally.

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