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Water Quantity <br />Water quantity is a concern for three reasons; <br />o flooding can cause damage to structures and septic systems and can cause <br />erosion, <br />o depleted surficial aquifers lower water tables resulting in the drainage of <br />wetlands, reduced lake water levels, reduced stream base -flow, and stress on <br />plant life adapted to historic water levels, and <br />o shortages in drinking water supplies. <br />The Metropolitan Council completed a study that concluded that several metropolitan <br />communities would experience drinking water shortages between now and 2030. Figure <br />8 shows anticipated drawdown where groundwater and surface water is closely <br />connected. This drawdown will dramatically impact surface water elevations. <br />2030 Dra..dawn where Ground -Surface 4 later Interacts <br />0 - 1 fagot <br />i - 3.281 feet (1 meter)_ <br />▪ 3281-5feet <br />▪ 5 - 10 feet <br />Greater than 10 Feet <br />90% <br />0055 <br />70% <br />80% <br />50% <br />40% <br />3055 <br />20% <br />1055 <br />0% <br />1 <br />1911-1950 1951-1960 1961-1970 1971-1980 1981-19910 1991-2000 2001-2010 <br />I I <br />Figure 8: Surficial Groundwater Drawdown <br />1 <br />Metropolitan Council (: <br />Photos: Aerometric <br />Anoka Conservation District Comprehensive Plan October 2014 page 17 <br />