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Table 1

Timing of sampling and duration of pre-exposure of mesh bags and tiles (2014) or nutrient diffusing substrates (2015). The start of the flow event is set as day 0. Sampling 1 was performed before the onset of the flow event. MB = mesh bags, NDS = nutrient diffusing substrates.

Year Round Exposure of tiles/NDS in flumes MB in stream MB in flumes Sampling 1 Flow event Sampling 2
2014 1& 2 −13 −6 to −3 −3 0 0–3 7
2015 1* −3 −6 to −3 −3 0 0–3 8
2015 2** −7 −11 to −7 −7 0 0–3 7

Pre exposure time had to be reduced compared to 2014 due to a partial collapse in the supporting structure of the flumes.


Due to clogging of one of the valves, the experiment was restarted after one week, reducing the pre-exposure time of the NDS and extending the time the mesh bags were in the flumes prior to the flood.

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