The direction of groundwater flow and general direction groundwater may carry contamination cannot be determined using two wells (two groundwater level or piezometric surface measurements).  Why?   One of the following option is correct. a) Darcy's law requires more than two points. b) Groundwater energy surface is in 2-D. The characteristics of a 2-D surface must be defined by more than 2 points (at least 3). c) Since one well will show higher energy than another, a third well is needed to confirm that the flow direction is between the two wells. d) The premise of the question is not correct. The energy gradient can be estimated from two points and flow direction can be estimated as long as the distance between the two points is known.

Structural Analysis
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ISBN:9781337630931
Author:KASSIMALI, Aslam.
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The direction of groundwater flow and general direction groundwater may carry contamination cannot be determined using two wells (two groundwater level or piezometric surface measurements).  Why?  
One of the following option is correct.
a) Darcy's law requires more than two points.
b) Groundwater energy surface is in 2-D. The characteristics of a 2-D surface must be defined by more than 2 points (at least 3).
c) Since one well will show higher energy than another, a third well is needed to confirm that the flow direction is between the two wells.
d) The premise of the question is not correct. The energy gradient can be estimated from two points and flow direction can be estimated as long as the distance between the two points is known.
 
 
 
 
  
Fick's law requires more than two points
 
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