Table 1
Sampling effort per stream per year by backpack electrofishing. Surveys in the years 2005, 2010, and 2015 were carried out in autumn for ecological status assessments required by the EU Water Framework Directive (WFD). In spring 2014, the habitat survey was conducted. The mean channel width and depth of the sampled transects were measured during the habitat survey in 2014. The lowest and highest measured values are depicted in brackets.
| River Geul | Gulp tributary | Mechelderbeek tributary | Selzerbeek tributary | |
|---|---|---|---|---|
| Number of sampled transects for the WFD: | ||||
| –2005 | 27 | 6 | 1 | 6 |
| –2010 | 20 | 6 | 3 | 5 |
| –2015 | 20 | 6 | 3 | 7 |
| Number of sampled transects for the habitat survey 2014 | 36 | 12 | 4 | 21 |
| Total channel length (km) | 58.0 | 22.0 | 4.5 | 10.5 |
| Channel length Dutch territory (km) | 37.0 | 8.7 | 4.5 | 10.0 |
| Mean, minimal and maximum channel width of transects (m) | 9.5 (4–16) | 3.5 (2–5) | 1.3 (1–2) | 2.9 (2–4) |
| Channel mean depth of transects (m) | 0.4 (0.17–0.93) | 0.4 (0.20–0.97) | 0.2 (0.10–0.27) | 0.4 (0.15–0.73) |
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