Drainage is a research area focused on the management and control of water flow in various systems, such as agricultural fields, urban environments, and natural watersheds. It involves studying techniques and methods for preventing flooding, controlling erosion, and ensuring proper water management to support healthy ecosystems and sustainable development. Research in drainage often includes topics such as surface water management, subsurface drainage systems, stormwater management, erosion control, and water quality monitoring. This field is interdisciplinary, drawing on knowledge from fields such as civil engineering, hydrology, geology, and environmental science.