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| − | ==Reduction of Surface Infiltration Through Use of Geophysical Methods and Grouting==
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| − | This page is a placeholder to be completed during June 2009
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| − | Geophysical instruments can be used to locate the areas where significant amounts of water are disappearing underground (Figures 1 and 2). Then small holes can be drilled or hammered into the stream less than 1 m into the rock beneath the sediment, and used to inject grout beneath the streambed (Figure 3). The approach has restored 85 - 100% of stream flow, and has even been used to reduce infiltration into active mining operations. The effectiveness of this approach is illustrated in Figure 4.
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| − | <div style="text-align:center">'''Figure 1. A two-person version of terrain conductivity being used to locate where stream water is leaving the streambed'''<br />[[Image:TerrainConductivity_.jpg]]</div>
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| − | <div style="text-align:center">'''Figure 2. Another way of measuring terrain conductivity to identify where water is leaving the streambed, and a graph presenting the results. The peaks represent areas of high conductivity where the water is infiltrating.'''<br />[[Image:Anotherwayofmeasuringterrainconductivity.jpg]]</div>
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| − | Figure 3. Grout being injected into the streambed.
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| − | Figure 4. The two graphs show how the conductivity peak has virtually disappeared and how flow has been restored across the formerly damaged streambed.
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Latest revision as of 12:41, 17 August 2010
