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Air-operated piezometers have been found suitable for measuring water pressure on the base of a concrete spillway weir. Hydrostatic pressure cells were embedded in native chalk; thin plastic tubing leads were extended through freshly poured, large-aggregate concrete. Sheet-brass barriers attached to leads with Flex fittings prevented piping. Operation for 2 1/2 years has been satisfactory.
piezometers, air, hydrostatic pressure, spillways, weirs, pressure cells, chalk, piping (erosion)
Warlam, A. A.
Consulting engineer, Hastings-on-Hudson, N. Y.
Thomas, E. W.
Civil engineer, Foundation & Materials Branch, Omaha District, U. S. Army Corps of Engineers, Omaha, Neb.