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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 Drawrdawn ufiere Ground -Surface 4 J'ater 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 />506 <br />00% <br />70% <br />60% <br />50% <br />40% <br />30% <br />20% <br />10% <br />0% <br />% Groundwater <br />1941-1950 1361-1960 1961-1973 1971-1300 1931-19910 1991-2000 2001-2010 Metropolitan Council <br />f fl ly ! Photos: Aerometric <br />Figure 8: Surficial Groundwater Drawdown <br />Anoka Conservation District Comprehensive Plan October 2014 page 17 <br />