List the method of irrigation drainage system in agriculture production

Here are the main methods of drainage systems used in agricultural production, which are crucial for managing water, especially in irrigated areas:

1. Surface Drainage Systems: These methods remove excess water from the soil surface.

   • Land Grading/Leveling: Shaping the land to create a uniform slope, allowing excess water to flow off efficiently.
   • Open Ditches: Channels dug to collect and convey surface runoff water away from fields.
   • Bedding/Crowning: Creating raised beds or crowns in fields to shed water into furrows or small ditches.

2. Subsurface Drainage Systems: These methods remove excess water from below the soil surface, lowering the water table and preventing waterlogging and salinity.

   • Tile Drains (Pipe Drains): Perforated pipes (e.g., plastic or clay) buried underground to collect and carry away excess groundwater.
   • Mole Drains: Unlined channels created by a mole plough, typically used for temporary drainage in heavy clay soils.
   • Deep Open Ditches: Deeper channels that serve as outlets for tile drains and can also directly lower the water table in adjacent areas.
   • Vertical Drainage (Drainage Wells): Pumping water from wells to lower the water table, often used in areas with deep aquifers.