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The groundwater table in the piedmont plain was only about 12m in depth in the 1950s and 1960s, but it lowered dramatically afterwards to about 2527m in depth (currently 2123m above sea level) due to overpumping of groundwater and drought in the region. This change has adversely affected the sustainable development and food supply of this important agricultural area. The groundwater table at Luancheng...
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