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Further pressure on the river-floodplain system is exerted by activities that drain excess water from the soil to increase areas suitable for crop production. Land areas may also be drained to serve for forestry or coastal and urban development. Drainage for agriculture has led to major losses of wetlands throughout Europe and is related to several hydromorphological pressures such as channelization of rivers and channel deepening (Vartia et al., 2018). In Europe, 35 % of wetland loss between 2000 and 2006 was due to conversion to agriculture (EEA, 2012); only in south-western Sweden, almost 70 % of wetlands have been lost due to drainage over the last 50 years (Franzén et al. 2016). In many European countries mainly in northern and central Europe, more than 40 % and up to 100 % of farmland is being drained (based on data from ICID, undated).[1] 

[1] http://www.icid.org/imp_data.pdf