Table 1.

Characteristics of the bioreactors at the different study sites

Bioreactors		Coordinates		Dimensions	Volume	Flow design1)	Total drained catchment	Relative amount of inlet drainage water treated in the bioreactor2)	Volume sedimentation pond
		Latitude (°)	Longitude (°)	W × L × D (m)	m3		Ha	%	m3
Gyldenholm	A	55.331	11.457	16.2 × 21.1 × 1.4	477	Horizontal-a	120	10	4.7
	B	55.3308	11.4571	16.2 × 21.1 × 1.4	477	Horizontal-a		17
	C	55.3306	11.4571	16.2 × 21.1 × 1.4	477	Horizontal-a		30
Hofmansgave	A	55.5387	10.4889	22.3 × 15.0 × 1.8	602	Horizontal-a	129	20	111
	B	55.5386	10.4888	22.3 × 15.0 × 1.8	602	Horizontal-a		15
	C	55.5385	10.4886	22.3 × 15.0 × 1.8	602	Horizontal-a		15
Egsmarken		55.234	10.5162	13.2 × 33.2 × 1.2	526	Horizontal-b	57	20	135
Dundelum		55.1551	9.4859	13.2 × 41.2 × 1.2	652	Vertical	45–60	33	81
Serupgård		56.3765	9.5984	5.8 × 36.0 × 1.3	271	Horizontal-b	80	13	76

¹⁾Horizontal-a. Fixed hydraulic gradient by inlet and outlet well (Fig. S6). Horizontal-b. Hydraulic gradient evolving dynamically (Figs. S7–S8)

²⁾The bioreactor units and subunits did not treat all drainage water from the catchment but only the relative share indicated in this column. For Gyldenholm and Hofmansgave, the share was based on measured amount of inlet water to the reactors, measured total water amount from the catchment and measured bypass flow. For the other three reactors, the relative share was estimated based on drainage maps and drained area compared to the size of the topographic catchment