Editing Siting Boreholes

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===Siting Boreholes: Geophysical Surveying===
 
===Siting Boreholes: Geophysical Surveying===
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|Geophysical surveying to support water borehole siting is often needed because the information collected during [[Borehole Siting:Reconnaissance | reconnaissance]] isn't enough to allow a confident assessment of where groundwater can be found. Geophysical surveying is a huge topic and only a very brief introduction is given here.
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Geophysical surveying to support water borehole siting is often needed because the information collected during [[Borehole Siting:Reconnaissance | reconnaissance]] isn't enough to allow a confident assessment of where groundwater can be found. Geophysical surveying is a huge topic and only a very brief introduction is given here.
  
 
There are many different geophysical techniques and countless types of equipment. Two of the main geophysical techniques used in borehole siting are electrical resistivity; and ground conductivity using FEM (frequency domain electromagnetic).  
 
There are many different geophysical techniques and countless types of equipment. Two of the main geophysical techniques used in borehole siting are electrical resistivity; and ground conductivity using FEM (frequency domain electromagnetic).  
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A detailed introduction to geophysical techniques that are useful for borehole siting can be found in the chapter '''Finding Groundwater''' in [https://www.developmentbookshelf.com/doi/book/10.3362/9781780441290 MacDonald et al. (2005)], which can be downloaded online.
 
A detailed introduction to geophysical techniques that are useful for borehole siting can be found in the chapter '''Finding Groundwater''' in [https://www.developmentbookshelf.com/doi/book/10.3362/9781780441290 MacDonald et al. (2005)], which can be downloaded online.
  
 
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[[File:P1040187.JPG |  left|thumb| 400px| Geophysical surveying for water borehole siting in Northern Ghana, using EM34. Photo credit: British Geological Survey.]]
 
[[File:P1040187.JPG |  left|thumb| 400px| Geophysical surveying for water borehole siting in Northern Ghana, using EM34. Photo credit: British Geological Survey.]]
 
[[File:P1040430.JPG |  right|thumb|  400px|Resistivity surveying equipment for geophysical surveying. Photo credit: British Geological Survey.]]
 
[[File:P1040430.JPG |  right|thumb|  400px|Resistivity surveying equipment for geophysical surveying. Photo credit: British Geological Survey.]]
 
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