Does anyone know an easy method to determine the radius of influence for slug tests ? As in, the representative volume of aquifer material being tested during a slug test. Thank you in advance!
The problem with estimating the radius of influence for a confined aquifer is that it depends on both transmissivity (T), time (t), and storativity (S). Bear (1972) derives a commonly used relationship R=1.5(tT/S)^0.5 for a confined aquifer. S can be estimated for the formation if it is not known. Because the R is in a log term many feel that the actual value of R is not extremely important because ln(R/r) will not change greatly. Haimson and Doe (1983) rationalized that if R is somewhere between 10 and 100 m, using 30 m for R should be close to +- 20%.
READ THIS PAPER
G. C. Mishra & P. K. Majumdar, Unsteady Solution for Well Recharge in A Low Diffusive Aquifer, J. Irrigation and drainage, ASCE, Vol. 136, No. 12, December, 2010
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