This handbook provides a comprehensive and technically grounded examination of irrigation and drainage systems, integrating engineering principles with resource management and agricultural sustainability. It explains the scientific and hydraulic foundations underlying water distribution, application efficiency, and soil–water interaction within cultivated landscapes.

The discussion addresses operational planning, system design optimisation, maintenance strategies, and performance evaluation, linking technical precision with long-term water conservation. Particular emphasis is placed on the socio-economic dimensions of irrigation development, including its influence on agricultural productivity, rural livelihoods, and food security.

The handbook further explores the relationship between population growth and water demand, highlighting the need for adaptive management and equitable allocation. By combining hydraulic analysis with policy awareness and practical field considerations, it establishes a structured framework for sustainable irrigation governance and responsible drainage system operation.