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2024 Hennepin County All -Jurisdiction Hazard Mitigation Plan <br />Volume 2 — Hazard Inventory <br />a portion of the heat is received by the surrounding soil which prevents ice lens formation and <br />heave action. For unheated structures, heaves can be prevented through keeping waters out of <br />freezing zone. Another mitigation method is to ensure soils surrounding structures are those less <br />susceptible to frost problems. <br />4.1.3.13.3. Distribution pipelines. Pipelines are susceptible to frost heave -produced ground <br />movements. Pipe materials, joining methods, soil conditions and water drainage are all important <br />factors in prevention of damages. In areas susceptible to frost heave damage, pipeline materials <br />should shift away from cast iron and threaded steel pipe and be replaced by plastic of welded <br />steel. Other measures can be taken to reduce the chances of frost damage to pipelines. These <br />include drainage to reduce water in the soil and eliminate standing water over pipelines. Soil <br />conditions may also be modified to reduce susceptibility to ice lens formation. <br />4.1.3.13.4. Flooding. Deep frost penetration can worsen spring meltwater flooding by preventing <br />soil absorption of snow melt or rainwater. Flood control and management measures must <br />consider the potential for deep frost effects in spring flood scenarios. <br />4.1.3.14. Response <br />Unknown, pending conclusion of the Hennepin County Emergency Management assessment in 2024. <br />4.1.3.15. Recovery <br />Unknown, pending conclusion of the Hennepin County Emergency Management assessment in 2024. <br />28 <br />