Hall Plot—Technique to monitor water-Injection wells

Technical animation describes the equation used to interpret ground-water pressure and the character of the host rock during waste-water injection. This technique to continuously monitor water-injection wells was developed by Howard Hall in 1963. This simple tool is based on the assumption of steady state radial flow. Hall’s method uses information about the mean ambient reservoir pressure, and it is assumed that the equivalent radius, er , of the reservoir domain influenced by the well is constant during the observation period.
Written,  directed and narrated by:  Nancy Dorsey, Geological engineer, Environmental Protection Agency (EPA)
Animation by Jenda Johnson, Earth Sciences Animated, for IRIS
Narration editing by John Stadleman, communications specialist, EPA
Reviewed by:
 Ken Johnson, Environmental engineer, EPA
 William Bates, Geologist, EPA
 Colin Dyroff, Chemical engineer, EPA
 Dan Yates, Ground Water Protection Council
Made possible by support from the National Science Foundation (NSF)

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