On behalf of the Ministry of Water Resources of P. R. China (MWR) and the International Association for Hydro-Environment Engineering and Research (IAHR), we are delighted to invite you to participate in the 35th IAHR World Congress, which will be held in September in 2013 in Chengdu, China. The Congress, inspired by the wisdom of "the wise find pleasure in water" from the ancient philosopher Confucius (551-479 BC), will focus on 6 themes: Water Engineering and Civilization; Hydro-Environment; Fluvial Hydraulics and River Management; Maritime Hydraulics and Coastal Engineering; Water Resources and Hydro- informatics; and Climate Change and Hazard Mitigation. It will be an exciting gathering for water and environment engineers to share knowledge and exchange ideas. Chengdu is a charming city with a long history, unique culture and delicious Sichuan food. The Congress in Chengdu will provide every delegate a life-time memorable experience. Tours will also be organized to well-known places such as Dujiangyan Irrigation Project, Jiuzhai Valley National Park and Three Gorges Project. The Congress is co-organized by China Institute of Water Resources and Hydropower Research (IWHR), Sichuan University, Tsinghua University and The University of Hong Kong under the auspices of MWR and IAHR. We look forward to welcoming you in Chengdu in September 2013.