The 5th International Conference on Water Resource and Environment (WRE 2019) was held in Macao, China from July 16th to 19th, 2019.

International Conference on Water Resource and Environment (WRE) is an annually-held conference. It aims to provide a platform for professionals and specialists to present their latest findings, opinions and views; to provide a forum to discuss the latest thinking by some of the leading scholars and experts of the world; to publish the best papers presented to advance the state of knowledge of water science in the world. Since its inception in 2015, WRE has been held successfully for four times: WRE 2018, WRE 2017, WRE 2016 and WRE 2015.