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<br />Ramsey County | Multi-Jurisdiction Hazard Mitigation Plan 8 <br />sinkholes and soil compaction. According to the USGS, more than 80% of the identified <br />subsidence in the United States is a consequence of human impact on subsurface water and is <br />an often-overlooked environmental consequence of land and water-use practices. Increasing <br />development can exacerbate subsidence problems and initiate new ones. <br />3.9.2 LOCATION <br />Parts of Ramsey County sit on a thick layer of limestone rock that is riddled with small holes and caves, <br />known as karst topography. Its large rivers and hills also create many slopes and cliffs. Heavy surface <br />rains may cause karst landscapes to fail causing landslides or sinkholes. Figure 9 shows karst distribution <br />throughout Minnesota. <br />Figure 9. Karst Distribution in MN <br /> <br />Source: www.ramseycounty.us <br />Figure 10 displays unstable soils and bedrock in south Ramsey County.