WWRC 85-20
Design and Installation of a Weighing Lysimeter
Abstract
The design and installation of an sensitive weighing lysimeter are
described. Located near Laramie, Wyoming near the Big Laramie River, the
lysimeter is at the highest elevation of any similar facility in the United
States and should provide unique models for these conditions. The lysimeter
consists of a 1.067m diameter cylinder suspended within a 1.118m diameter
cylinder by three load rings held in tension. The soil profile depth is
1.372m. Approximately the bottom two-thirds of the soil profile was repacked
in 15cm lifts. The top 45cm of the soil profile and the vegetation was
installed undisturbed. The load rings are sensitive to approximately .3mm of
water on the surface of the lysimeter. The lysimeter drainage system allows
simulation of any desired water table depth. The data acquisition system can
sample lysimeter data, along with data from an accompanying weather station at
any selected interval and store the data for weekly unloading.
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