Abstract
The city of Beijing has long-term concerns over the sustainable yield from its groundwater aquifers. The aquifers provide half of the city’s water supply and have seen falling water tables over the past century. The sustainable yield of aquifers below urban Beijing is assessed based on changes to the groundwater budget equation from virgin conditions. Sources of anthropogenic recharge, including leakage from water mains and sewer pipes, seepage from septic tanks, irrigation, gardening, and artificial recharge, are together as large as changes to the groundwater flux as a result of groundwater withdrawals. Changes to natural recharge, and to a lesser extent natural discharge, also significantly impact the water budget. Uncertainty persists in several components of the budget equation, in particular changes to the groundwater flux. Estimates of the upper and lower bounds for sustainable yield are relatively unchanged for the years 2000, 2010, and 2015. However, the components of the budget will change as se...
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