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BUBBLE RADIUS AND DISTRIBUTION <br /> As with mounding, it is often convenient to think of bubble <br /> movement as . being symmetrical and circular. In reality it is <br /> rarely so uniform. However, there are some general - findings <br /> which can serve as guidelines in interpreting results -of the <br /> bubble tests. First of all, bubbles in a more uniform sandy <br /> deposit move upwards at about, a 450 angle when released at <br /> critical bubbling pressure. Doubling the depth doubles the <br /> radius. Unfortunately, stratified deposits may also be <br /> encountered which may divert bubble vertical movement. <br /> For every doubling of pressure above critical bubbling <br /> pressure, the radius of influence will expand 1. 42 .times its. <br /> original radius. This approximation is based upon . <br /> maintaining a fixed thickness of aquifer while doubling the <br /> volume of the cylinder. <br /> An approximation of the relationship between depth, radius <br /> and pressure for a medium to fine sand is presented in <br /> Figure 5 . <br /> 45. <br /> 40 <br /> 35- <br /> LU <br /> W <br /> LL ao <br /> LIJ <br /> Z <br /> O <br /> N 20 <br /> 0 <br /> Z 15 <br /> (n 5 FEET BELOW <br /> M 10 STATIC WATER <br /> CD <br /> S_ <br /> 0 - .10 20 30 40 SO 60 <br /> AIR PRESSURE (PSI) <br /> Figure S. Relationship Between Bubble <br /> Zone Width, Depth of <br /> Spargepoint and Pressure for <br /> a Medium Sand Aquifer <br /> 11 ' I <br /> Va f� 1\l� l�' f, Lr,- 1 ��S1C1vlS ..I &C,1.1 1Lc� f 41 �I14G � toyA �o �1�� Nl�y l`f1 I`]"1`1 . ' I <br /> 11 <br />