|Open standpipe piezometers are similar to observation wells, with the exception that the perforated portion of the pipe and sand filter region (backfill) is sealed in a discrete zone and the riser pipe is much narrower. The smaller diameter of the pipe reduces the lag time related to changes in ground water levels. Above the sand filter, the remaining backfill should include a seal (either cement/bentonite or bentonite pellets). Surface runoff should be prevented from entering the standpipe by installing a box or monument that does not prevent the pipe from venting. Groundwater levels in standpipes are read using an electronic dipmeter which signals when the water surface inside the pipe is encountered. The depth is measured using the graduated cable. Open standpipe piezometers have a long, successful performance record and are preferable to observation wells in many applications. Open standpipe piezometers should be used only in materials of high to moderately high permeability so that lag time remains relatively short. Standpipe piezometers are less effective in low-permeable silts or clayey soils to measure fluctuations in groundwater levels.
Details for U.S. Fish and Wildlife Service - Ecological Services - Northern Indiana Field Office
Office: P.O. Box 2616 Chesterton, IN 46304
Contact Name: Elizabeth McCloskey
Contact Title: Biologist
Phone Number: 315-369-6290
Fax Number: 219-983-9816
Email Address: Elizabeth_McCloskey@fws.gov
Website URL: http://www.fws.gov/r3pao/n_ind/
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