Inspection of the number of days of medium and high flows showed that the same declining trend observed in other metrics is observed in these metrics (Figure 3). In general this decline is more pronounced in the observed flow data rather than the modelled flow data, especially in the lower Flaxman Valley (Penrice gauge). It is generally considered that dam development does not have a significant impact on medium and high flows as these predominatly occur during the high flow season when dams are full and spilling (VanLaarhoven, 2012, VanLaarhoven and van der Wielen, 2012). The large differences noted in the Flaxman Valley, especially in the medium flows, likely reflects the very heavy dam development in this area.