Book excerpt: The issue of drainage, i.e. 'draining the water off', is as important as the issue of irrigation, i.e. 'application of water'. Drainage influences food security, agricultural occupation, municipal usage, sanitation and hygiene, land restoration, water resource management, hydrological disaster management and ecological balance. This book provides the reader with a tri-dimensional exposure of drainage at par with surface and subsurface drainage, and sustainable systems. It constitutes the experiences of renowned authors and their associates from around the world who have dealt with wide ranging subjects of the drainage phenomena. This book will benefit field engineers, academicians and graduate students who share this area of interest.