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. Reducing soil subsidence caused by peat oxidation is a majorchallenge in the Dutch peatlands. To maintain suitable conditions for dairyfarming water levels are periodically lowered to keep pace with soilsubsidence. Consequently, soil subsidence continues, causing increasingwater management costs. We experimented with pressurized drainage in PolderSpengen, a peatland polder in the west of the Netherlands that is primarilyused for dairy farming. In this polder, surface water levels of 40 cm belowground surface are maintained, which results in average soil subsidencerates of 7 mm yr −1 . Pressurized drainage is a novel technique to reducesoil subsidence, it uses field drains that are connected to a small waterbasin. Surface water can be pumped in or out the water basin, which enablesactive manipulation of the pressure head in the field drains. The objectiveof this study is to implement this technique into practice and determine itseffect on groundwater tables, soil subsidence rates, and water demand. Weapplied pressurized drainage in 55 ha of peatland meadows in PolderSpengen, distributed over seven farms. We monitored groundwater tables,surface elevation and water demand. Preliminary results show that during theextreme dry summer of 2018, groundwater tables could be maintained at 40 cmbelow ground surface, which is 60 cm higher compared to locations withoutpressurized drainage. This reduced soil subsidence by 50 %. Throughout theentire summer of 2018, the water demand amounted to 3–5 mm d −1 . Webelieve the technique can effectively contribute to minimize soilsubsidence, but relatively high implementation costs may be a barrier tolarge-scale implementation.

Pressurized drainage can effectively reduce subsidence of peatlands – lessons from polder Spengen, the Netherlands