Enunciate the reasons for waterlogging and describe various management strategies to mitigate waterlogging.
Waterlogging refers to a condition where soil pores become saturated, reducing aeration and restricting root growth. It is a major problem in canal command areas and poorly drained regions.
Reasons for waterlogging:
Excessive canal irrigation: Continuous use without drainage raises water table.
Seepage losses: From unlined canals and field channels.
Poor natural drainage: Clayey soils and flat topography restrict percolation.
High rainfall: Inadequate runoff disposal causes accumulation.
Over-irrigation with tubewells: Indiscriminate pumping raises soil moisture beyond capacity.
Obstruction of natural flow: Roads, embankments, and bunds impede water movement.
Management strategies:
Surface drainage: Construction of open drains, ditches, and field channels for quick removal of excess water.
Subsurface drainage: Installation of tile or pipe drains at depth to lower water table.
Bio-drainage: Planting trees like Eucalyptus and Poplar with high water consumption.
Irrigation scheduling: Adopting need-based, controlled irrigation reduces excess application.
Canal lining: Prevents seepage and reduces recharge to groundwater.
Rainwater harvesting and recycling: Captures excess water for later use.
Conjunctive water use: Balances groundwater withdrawal with surface water application.
By integrating engineering, biological, and management approaches, waterlogging can be mitigated sustainably.
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