A Mechanical Stage-Height Stormflow Sampler
- Hans Riekerk *
A vacuum-powered sequential stormflow sampler with intake valves controlled by floats during both rising and falling water levels was developed and tested. The rising float assembly of each subunit triggered a mouse-trap valve that opened two vacuum lines, one of which directly collected a water sample. Simultaneously, a needle valve in the float pipe closed and kept the second intake line primed. The weight of the float assembly in the falling water level opened the second intake line to collect a water sample. Differences in time-series data from field trials of the stage-height sampler with six subunits ascending at 15-cm intervals as compared with a time-controlled sampler varied an average of 21 %.
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