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The Bouwer and Rice Slug Test -- An Update i by Herman Bouwerb -map w+ i i ABSTRACT INTRODUCTION i The Bouwcr and Rice slug test was developed to The slug test developed b-s Bouvier and Rict measure aquifer hydraulic conductivity around boreholes (1976) permits. the measurement of saturated (production monitoring or test wells) The wells can be hydraulic conductnit) (K)of aquifer materials partially penetrating and partially screened perforated,or with a single well The method consists of quickly otherwise open The slug test can be based on quickly %3th drawing a volume of water from the well and mcasunng the lowering or raising the water level in a well or bort subsequent rate of rise of tht water level in the well,or by hole from equilibrium and measuring its subsequent adding a slug of water and measuring the subsequent rate rate of rise or fall, respectivel) The method w as of fall of the water level in the well Whilc originall) designed to measure K of the aquifer around the developed for unconfined aquifers the method can also be screen or otherwise open portion of the K ell for used for confined or stratified aquifers if the top of the screen or perforated section is some distance below the fully or partially penetrating v►clls in unconfined upper confining layer Anomalies ("double straight line aquifers Because of its simplicit) , the Bouvtcr and effect")sometimes observed in thr measured rate of rise of Rice slug test has become a frequit)htly used tool in the water level to the well arc attributed to drainage of a ground-Water investigations This paper addresses gravel pack or developed zont around the tit 11 f»1' -i inr sonic of the experiences obtained %ith the method, lowering of the water level 'I ht ((it.1 including the validity of falling level tests, use of be eliminated b) ignoring the tach d it the second straight lint purtior it - , the method in confined aquifers, effect of draining calculation of h)draulrt condut 1 % i �i - �� gravel packs on the rise of the %ater level, effect of applicable to an) diamntr ami • It i� 1"It hole diameter, and computer processing of field Provided that the dimension. s%U t ni art c n a re d data by the ranges for which tht pita .rn factor Kt ha%httn worked out The smaller tht diamcitr of the holt, however, METHODOLOGY the more vulnerable the results w til be to aquifer heteroge netttcs and to inaccuracies in estimating effective well Geometry and symbols of a slug-tested Kell diameters Computer programs for rapid processing of the arc shown in Figurc 1 7 he rate of flow of ground field data have been developed water into the well %hen the m 2trr lev el in tht well is a distance y loKcr than the static ground %ater table around tht %ell is calculated with the 7 hitni equation as (] } Q = 2rrK1K yln(Re/rw) aContribution of the U S Department of Agriculture, Agricultural Research Service where Q= volume rate of flout into well, bLaboratory Director, U 5 Water Conservation K = hydraulic conductivity of aquifer around %%,ell, Laboratory,Phoenix,Arizona 85040 Received December 1986, revised August 1988, Le = length of ice cenrd, perforated, or othrCN isC accepted September 1988 open section of well,y = vertical difference between Discussion open until November 1. 1989 water level insidt v%ell and static water table outside