Furthermore, some of the strongest growth has been in regions with low recharge rates as shown in Figure 7 (Burke and Villholth 2007). In OECD, surface water occupies two third of irrigated areas (OECD, 2015a). Watershed responses to reduced precipitation (including rain- and snowfall) and higher temperatures are typically amplified, due to vegetation interception and transmission loss (Arnell 2004).