Estimates for the annual historic flow of the Yarmouk range between 450 and 500 MCM,25 though the river has a highly variable flow regime and is prone to severe flooding. The mean annual flow was 152 MCM at Maqarin and 120 MCM downstream at Addasiya (Figure 14). Early records from both Yarmouk gauging stations for the period 1963-1984 show a certain degree of variation with high- and low-flow periods.