Water 2015, 7, 4575-4592; doi:10.3390/w7084575 OPEN ACCESS water ISSN 2073-4441 www.mdpi.com/journal/water Article Impacts of the 2013 Extreme Flood in Northeast China on Regional Groundwater Depth and Quality Xihua Wang 1,2,3, Guangxin Zhang 1,3,* and Yi Jun Xu 4 1 Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China; E-Mail:
[email protected] 2 University of the Chinese Academy of Sciences, Beijing 100049, China 3 Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China 4 School of Renewable Natural Resources, Louisiana State University Agricultural Center, 227 Highland Road, Baton Rouge, LA 70803, USA; E-Mail:
[email protected] * Author to whom correspondence should be addressed; E-Mail:
[email protected]; Tel.: +86-0431-88542210; Fax: +86-0431-85542298. Academic Editor: Athanasios Loukas Received: 10 April 2015 / Accepted: 19 August 2015 / Published: 24 August 2015 Abstract: Flooding’s impact on shallow groundwater is not well investigated. In this study, we analyzed changes in the depth and quality of a regional shallow aquifer in the 10.9 × 104 km2 Sanjiang Plain, Northeast China, following a large flood in the summer of 2013. Pre- (2008–2012) and post-flood records on groundwater table depth and groundwater chemistry were gathered from 20 wells across the region. Spatial variability of groundwater recharge after the flood was assessed and the changes in groundwater quality in the post-flood period were determined. The study found a considerable increase in the groundwater table after the 2013 summer flood across the region, with the largest (3.20 m) and fastest (0.80 m·s−1) rising height occurring in western Sanjiang Plain.