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Eugene -Springfield Area Natural Hazards Mitigation Plan <br />2. Hazard Descriptions <br />Natural Climate Variability <br />Precipitation deficiency High temperature, high winds, low <br />(amount, intensity, timing) relative humidity, greater m <br />sunshine, less cloud cover 0 <br />of <br />Reduced infiltration, runoff, <br />o G <br />deep percolation, and Increased evaporation <br />°y 0 <br />ground water recharge and transpiration <br />m <br />C <br />O Soil water deficiency <br />.m <br />� t <br />3 <br />Plant water stress, reduced <br />> > <br />0 0 <br />y biomass and yield <br />00 <br />F_______________ _____________ <br />Reduced streamflow, inflow to <br />R .. <br />reservoirs, lakes, and ponds; <br />am <br />reduced wetlands, <br />o m <br />wildlife habitat <br />o p <br />ao <br />T <br />S <br />Economic Impacts <br />I <br />social Impacts <br />Environmental Impacts <br />Figure 2-1. Types ofDrought (National Drought Mitigation Center)12 <br />2.2.2 Climate Change <br />Since the mid-1900s, the mountains in the Pacific Northwest have experienced a <br />decline in spring snowpack due to a change in precipitation type from snow to rain <br />and a shift in the timing of snowmelt. Warmer temperatures are causing earlier <br />snowmelts which can lead to the water supply being increasingly out of sync with <br />the area's typical water demands.13 The National Climate Assessment predicts a <br />slight decrease in the average annual precipitation and an increase in temperatures. <br />This could mean longer, more severe, droughts.14 <br />2.2.3 History of the Hazard in Eugene -Springfield <br />The National Drought Mitigation Center at the University of Nebraska -Lincoln <br />tracks drought conditions across the country. Data can be broken down at the county <br />or watershed basin levels. This data is recorded as a percentage of the area <br />12 United States. University of Nebraska National Drought Mitigation Center. Types ofDrought <br />Accessed August2019. https://droughtunl.edu/Education/DroughtIn-depth/TypesofDrought.asl)x <br />" Cook, Edward R., Richard Seager, Mark A. Cane, and David W. Stable. North American drought: <br />reconstructions, causes, and consequences. (Earth -Science Reviews 81, no. 1, 2007), 93-134. <br />14 United States. US Global Change Research Program National Climate Assessment Overview: <br />Region Impacts. 2014. Accessed October 2017. <br />http://nea20l4.globalchange.gov/highlights/overview/overview. <br />2-3 January 2020 <br />