page_title: Drainage
hierarchical_section_title: Drainage
context_page_description: Drainage is the natural or artificial removal of surface and sub-surface water from a given area. Many agricultural soils need drainage to improve production or to manage water supplies.
context_section_description: Drainage is the natural or artificial removal of surface and sub-surface water from a given area. Many agricultural soils need drainage to improve production or to manage water supplies.
caption: The Zuiderzee in the Netherlands was partly changed into land by building polders and draining them. Old land is mostly green, new one is darker in color.
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