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Includes 

  • All areas farmed and drained artificially
  • Surface conduits, trench and watercourses that have been artificially (man-made) altered

Excludes

  • Drainage of peatlands 
  • Land in the marshs

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fig42
fig42

Figure 42 Figure 44 - Adjustable drainage in the Netherlands

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Source: https://www.wur.nl/en/article/Adjustable-drainage-can-retain-water-on-plots.htm 

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fig43
fig43

Figure 45 43 - Agricultural drainage

Source: https://chambres-agriculture.fr/actualites/toutes-les-actualites/detail-de-lactualite/actualites/le-drainage-agricole-des-techniques-a-remettre-a-lagenda-pour-les-agriculteurs-et-pour-les-territ/ 

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fig44
fig44

Figure 46 44 - Methods of drainage

Source: https://agriculturistmusa.com/methods-of-drainage/ 

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fig45
fig45

Figure 47 45 - Construction of drainage in Germany

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