Page 193 - Freshwater-Biology-and-Ecology-Handbook

Figure 4.7 Figure 4.8
Bou-Rouch pump and standpipe Williams standpipe corer

Sometimes it is helpful or even necessary to obtain samples The Williams Standpipe Corer (Figure 4.8) has a similar pipe,
from the hyporheic zone: the deep interstitial gravels although instead of pumping water upwards, the Williams
beneath the surface benthic layer. Several specialised corer has a sampling aperture that is opened at the desired
sampling devices have been developed to obtain hyporheic gravel depth, rotated to scoop a sample inside the standpipe,
macroinvertebrate samples. and then closed before extraction. This provides a small but
non-filtered sample from deep within river gravels.
The Bou-Rouch Pump (Figure 4.7) is a hand-operated pump
that sucks interstitial water up a standpipe hammered into
river gravels and into a collecting net (Figure 4.6). This is
probably the quickest way to obtain a hyporheic sample,
although pumping can filter out the larger freshwater
invertebrates.

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