A groundwater velocity probe is provided comprising a surface with a first portion and a second portion, an injector for injecting a tracer proximate the first portion, a detector for detecting the tracer proximate the second portion, and a timer for measuring time elapsed between injecting the tracer and detecting the tracer. A method of measuring groundwater velocity in an aquifer is also provided comprising the steps of providing a groundwater velocity probe in an aquifer, the groundwater velocity probe having a surface with a first portion and a second portion, an injector for injecting a tracer having a characteristic property proximate the first portion, a detector for detecting the characteristic property of the tracer proximate the second portion, and a timer for measuring time elapsed between injecting the tracer and detecting the characteristic property of the tracer, injecting the tracer proximate the first portion, starting a timer in a datalogger, detecting the characteristic property of the tracer proximate the second portion, inputting an electrical signal representative of the characteristic property to the datalogger, and measuring time elapsed between injecting the tracer and detecting the characteristic property with the datalogger.
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