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Open AccessArticle

Variable Seepage Meter Efficiency in High-Permeability Settings

1
U.S. Geological Survey, Water Mission Area, Denver, CO 80225, USA
2
Department of Geology, Faculty of Sciences, University of Malaga, 29071 Malaga, Spain
3
Department of Geosciences and Natural Resource Management, University of Copenhagen, 1350 Copenhagen, Denmark
*
Author to whom correspondence should be addressed.
Water 2020, 12(11), 3267; https://doi.org/10.3390/w12113267
Received: 25 September 2020 / Revised: 17 November 2020 / Accepted: 18 November 2020 / Published: 21 November 2020
The efficiency of seepage meters, long considered a fixed property associated with the meter design, is not constant in highly permeable sediments. Instead, efficiency varies substantially with seepage bag fullness, duration of bag attachment, depth of meter insertion into the sediments, and seepage velocity. Tests conducted in a seepage test tank filled with isotropic sand with a hydraulic conductivity of about 60 m/d indicate that seepage meter efficiency varies widely and decreases unpredictably when the volume of the seepage bag is greater than about 65 to 70 percent full or less than about 15 to 20 percent full. Seepage generally decreases with duration of bag attachment even when operated in the mid-range of bag fullness. Stopping flow through the seepage meter during bag attachment or removal also results in a decrease in meter efficiency. Numerical modeling indicates efficiency is inversely related to hydraulic conductivity in highly permeable sediments. An efficiency close to 1 for a meter installed in sediment with a hydraulic conductivity of 1 m/d decreases to about 60 and then 10 percent when hydraulic conductivity is increased to 10 and 100 m/d, respectively. These large efficiency reductions apply only to high-permeability settings, such as wave- or tidally washed coarse sand or gravel, or fluvial settings with an actively mobile sand or gravel bed, where low resistance to flow through the porous media allows bypass flow around the seepage cylinder to readily occur. In more typical settings, much greater resistance to bypass flow suppresses small changes in meter resistance during inflation or deflation of seepage bags. View Full-Text
Keywords: seepage meter; groundwater–surface–water interaction; sediment–water interface seepage meter; groundwater–surface–water interaction; sediment–water interface
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MDPI and ACS Style

Rosenberry, D.O.; Nieto López, J.M.; Webb, R.M.T.; Müller, S. Variable Seepage Meter Efficiency in High-Permeability Settings. Water 2020, 12, 3267. https://doi.org/10.3390/w12113267

AMA Style

Rosenberry DO, Nieto López JM, Webb RMT, Müller S. Variable Seepage Meter Efficiency in High-Permeability Settings. Water. 2020; 12(11):3267. https://doi.org/10.3390/w12113267

Chicago/Turabian Style

Rosenberry, Donald O.; Nieto López, José M.; Webb, Richard M.T.; Müller, Sascha. 2020. "Variable Seepage Meter Efficiency in High-Permeability Settings" Water 12, no. 11: 3267. https://doi.org/10.3390/w12113267

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