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This article in SSSAJ

  1. Vol. 37 No. 1, p. 133-135
    Received: Mar 23, 1972
    Accepted: Sept 13, 1972

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A Multichannel Syringe Pump for Steady State Flow in Soil Columns1

  1. P. J. Wierenga,
  2. R. J. Black and
  3. P. Manz2



A multichannel syringe pump3 was designed for maintaining a constant rate of outflow over long periods of time. Low flow rates are obtained by using a timer-control which causes the pump to make one cycle per set time interval. The pump is not pulse free, but for many studies requiring steady state water movement in soil columns this is not considered too great a disadvantage. Measured over a 10-day period at a rate of outflow of 173 ml/day, the mean day-to-day variation was less than 0.2 ml/day.

3 The pump may be constructed with the aid of a machinist, or may be purchased from the Physical Science Laboratory, New Mexico State University. Approximate costs are $450, including labor and parts, for one six channel pump as described here. Construction details are available from the authors.

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