Reduction of Surface Infiltration
Reduction of Surface Infiltration Through Use of Geophysical Methods and Grouting
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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.
Figure 3. Grout being injected into the streambed.
Figure 4. The two graphs show how the conductivity peak has virtually disappeared and how flow has been restored across the formerly damaged streambed.