Research paper
In-situ method for monitoring layered hydraulic impedance development during artificial recharge with turbid water

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Abstract

An in-situ procedure for monitoring changes in impedance of layered pit bottoms of artificial recharge facilities was developed and tested. The pit monitoring procedure requires only the measurement of the initial hydraulic conductivity, and the hydraulic conductivity during pit operation using a ring infiltrometer and a single tensiometric installation. Hydraulic gradient and impedance ratio criteria measured in a test facility enabled the extent of impedance formation due to clogging to be followed during the application of turbid water. Surface (0–8 cm) impedance changes of 200–800 times the initial impedance were measured for two sites, while only one site indicated a ten- to twenty-fold increase in impedance in the 8–23 cm layer. No changes in impedance were observed below 23 cm. Physical measurements indicated that deposition of silt predominated at the surface, while some of the clay penetrated to greater depths.

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Contribution from North Dakota State Water Commission in cooperation with the U.S. Bureau of Reclamation.

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