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Table 1

Latest controlled drainage studies in Nordic areas

Study	Method	Country	Period	Drain flow reduction (%)
Rozemeijer et al. (2016)	Experimental	Denmark	2007–2011	46–58
Carstensen et al. (2016)	Experimental	Denmark	2012–2015	6–52
Österholm et al. (2015)	Experimental	Finland	2011–2013	Negative
Povilaitis et al. (2018)	Experimental	Lithuania	2014–2016	55–80
Sunohara et al. (2016)	Experimental	Canada	2005–2013	60
Saadat et al. (2018)	Experimental	USA/Indiana	2007–2016	27–85
Wesström & Messing (2007)	Experimental	Sweden	1996–2000	60–95
Wesström et al. (2014)	Experimental	Sweden	2002–2005	40–60

Study	Method	Country	Period	Drain flow reduction (%)
Rozemeijer et al. (2016)	Experimental	Denmark	2007–2011	46–58
Carstensen et al. (2016)	Experimental	Denmark	2012–2015	6–52
Österholm et al. (2015)	Experimental	Finland	2011–2013	Negative
Povilaitis et al. (2018)	Experimental	Lithuania	2014–2016	55–80
Sunohara et al. (2016)	Experimental	Canada	2005–2013	60
Saadat et al. (2018)	Experimental	USA/Indiana	2007–2016	27–85
Wesström & Messing (2007)	Experimental	Sweden	1996–2000	60–95
Wesström et al. (2014)	Experimental	Sweden	2002–2005	40–60