An understanding of groundwater and surface- water exchanges in the northeast Twin Cities Metropolitan Area has been limited by the lack of hydrologic data. Groundwater and surface- water exchanges can be important in determining lake levels where these exchanges are an important component of the water budget of a lake.
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Water levels declined from 2003 to 2011 in many lakes in Ramsey and Washington Counties in the northeast Twin Cities Metropolitan Area, Minnesota however, water levels in other northeast Twin Cities Metropolitan Area lakes increased during the same period. Statistical analysis of lake levels and field study of groundwater and surface- water exchanges in the northeast Twin Cities Metropolitan Area, Minnesota, 2002 through 2015: Chapter A of Water levels and groundwater and surface- water exchanges in lakes of the northeast Twin Cities Metropolitan Area, Minnesota, 2002 through 2015 Image courtesy NASA Landsat7 Science Team and USGS Eros Data Center About 20 miles south of the airport is the Bingham Canyon Copper Mine (tan pixels), the world's largest open pit excavation. Salt Lake City International Airport is visible on the northwestern edge of the city. A number of water reservoirs can be seen east of the mountain range. The greyish pixels in the center of the image show the developed areas of the city. The furrowed green and brown landscape running north-south is a portion of the Wasatch Mountains, some of which are snow-capped (white pixels). The southeastern tip of the Great Salt Lake is visible in the upper left of the image. This true-color image of Salt Lake City was acquired by the Enhanced Thematic Mapper Plus (ETM+), flying aboard Landsat 7, on May 26, 2000. Today Salt Lake City, the capital of Utah, is home to more than 170,000 residents. The city was first settled in 1847 by pioneers seeking relief from religious persecution. The city is located on the southeastern shore of the Great Salt Lake and sits to the west of the Wasatch Mountains, which rise more than 3,500 meters (10,000 feet) above sea level. Salt Lake City, Utah, will host the 2002 Winter Olympic Games. A field study of groundwater and surface- water interactions in selected lakes was completed to (1) estimate potential percentages of surface- water contributions to well water across the northeast Twin Cities Metropolitan Area, (2) estimate general ages for waters extracted from the wells, and (3) assess groundwater inflow to lakes and lake-water outflow to aquifers downgradient from White Bear Lake. Groundwater flow was simulated using a steady-state, groundwater-flow model to assess regional groundwater and surface- water exchanges and the effects of groundwater withdrawals, climate, and other factors on water levels of northeast Twin Cities Metropolitan Area lakes. OverviewThis study assessed lake-water levels and regional and local groundwater and surface- water exchanges near northeast Twin Cities Metropolitan Area lakes applying three approaches: statistical analysis, field study, and groundwater-flow modeling. Statistical analyses of lake levels were completed to assess the effect of physical setting and climate on lake-level fluctuations of selected lakes. Water levels and groundwater and surface- water exchanges in lakes of the northeast Twin Cities Metropolitan Area, Minnesota, 2002 through 2015 In consideration for the receipt of the information on this page, the recipient agrees to use the information solely for the private noncommercial purpose of identifying a property in which the recipient has a good faith interest in acquiring.
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