| http://www.w3.org/ns/prov#value | - The injected tracers used for groundwater velocity estimation have included such substances as chloride and bromide [Mackay et al., 1986], and fluorescent dyes [Kasnavia et al., 1999].[6] Because of the time and cost of performing natural gradient tracer tests a variety of instruments have been developed to measure groundwater velocity at the scale of a single well.
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