08-04-25 - City Council Work Session Agenda

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Additionally, the Metropolitan Council's Localized Flood Map Screening Tool' identifies localized flood hazards, referred to as Bluespots, which are broken into risk categories based on potential flood water depth. This tool is meant to show potential localized flood risk areas during short-term, extreme rain events. The tool shows several Primary, Secondary, Tertiary, and Shallow Bluespots mapped throughout the study area with maximum depths ranging from 0.37 feet to 8.92 feet. Primary Bluespots are the first areas to fill with water and are generally considered higher risk, while Secondary Bluespots are separate, isolated low areas generally considered low risk. All three sources of flood data show a risk of flooding within the study area. Consideration should be taken during the design and review of individual proposed development to verify that appropriate flood mitigation measures are being implemented to protect future development as well as neighboring properties. Further analysis of flood risks and mitigation is described in Item 12: Water Resources. Cooling Degree Days As defined by the National Weather Service, degree days are based on the assumption that when the outside temperature is 65°F, heating or cooling is not needed to be comfortable. Degree days are the difference between the daily temperature mean and 65°F. If the temperature mean is above 65°F, 65 is subtracted from the mean and the result is the cooling degree days. For example, if the mean temperature over a 24-hour period is 70°F, then there have been 5 cooling degree days.8 Cooling degree days are used as a proxy to estimate cooling needs for buildings. According to Heat Vulnerability in Minnesota, the number of cooling degree days in 2019 for Anoka County was 379. The number of cooling days in 2050 for Anoka County is projected to be 453 and 598 for RCP 4.5 and 8.5, respectively.9 ' Localized Flood Map Screening Tool. Metropolitan Council Available at https://metrocou ncii.org/Communities/Planning/Local-Planning-Assistance/CVA/Tools-Resources.aspx. 8 "What Are Heating and Cooling Degree Days." National Weather Service. Available at https://www.weather.gov/key/climate heat cool. 9 Heat Vulnerability in Minnesota. Minnesota Department of Health and the University of Minnesota. Available at httos://mar)s.umn.edu/climatehealthtool/heat aoD/. Lino Lakes Main Street - AUAR 13 July 2025 Page 21 of 617