Laserfiche WebLink
2024 Hennepin County All -Jurisdiction Hazard Mitigation Plan <br />Volume 2 — Hazard Inventory <br />Current flash -flood guidance for 1, 3, and 6-hour rainfall can be found at: <br />• https://www.weather.gov/ncrfc/LMI_ROF_NFP_FlashFloodGuidance <br />4.3.6.12. Prevention <br />To improve water management and protect the sewage system from damage, cities can revamp their <br />underground pipe and drainage systems by separating rainwater from the sewage system. The separation <br />enables the wastewater treatment plant to function properly, without it being overburdened by large <br />quantities of storm water. <br />Other more obvious methods are to keep sewer systems clean of clog up with waste, debris, sediment, <br />tree roots and leaves. <br />4.3.6.13. Mitigation <br />Areas that have been identified as flood prone areas can be turned into parks, or playgrounds, buildings <br />and bridges can be lifted, floodwalls and levees, drainage systems, permeable pavement, soil <br />amendments, and reducing impermeable surfaces. Reducing impervious surfaces could include the <br />addition of green roofs, rain gardens, grass paver parking lots, or infiltration trenches. <br />Other mitigation strategies include developing a floodplain management plan, form partnerships to <br />support floodplain management, limit or restrict development in floodplain areas, adopt and enforce <br />building codes and development standards, improve storm water management planning, adopt policies <br />to reduce storm water runoff, and improve the flood risk assessment. <br />4.6.3.14. Response <br />One of the most important things to be done during the initial response is to make sure that people are <br />safe. If their homes have been damages and are unlivable, finding a place for them to stay is among one <br />of the top priorities. Next is the access to places if roads are washed out or still underwater. One <br />complicated factor with flood disasters, is sometimes you do not know how bad the damage is until the <br />water recedes, which can take time and slow the response. Another important part of response is to make <br />sure water supply is available as quick as possible if there has been any contamination. The role of <br />Hennepin County Emergency Management is to coordinate resources that our municipalities may need <br />to accomplish all response needs. <br />4.6.3.15. Recovery <br />As mentioned in river flooding, recovery from floods can take weeks, to months, to years. Extreme <br />rainfall/flooding is unlike quick onset disasters (e.g., tornadoes) where you can see the damage <br />immediately, sometimes with excessive rainfall/flooding you must wait for the flood waters to recede to <br />find out what damage there is to recover from. A lot of the time, the longer the water level stays too high, <br />the more consequences are introduced that you must then recover from. <br />4.6.3.16. References <br />129 <br />