The area is prone to winter floods of fresh water and occasional salt water inundations. Low-lying land is more fertile but also has morasses, inundations and miasmas. Floods continued, however, with especially severe inundations in 1938, 1959 and 1975. This rain caused small inundations, storm drain overflows, and closed one major highway. Regular inundations were a cause for celebration; low waters often meant famine and starvation. Paperbark trees flourish on swampy land, helped by inundations when the reservoir over fills. While the inundations were slowly but steadily taking effect the RAF bombed German artillery positions. The Germans attacked its most southern point, the Grebbeberg, where there were no inundations. It seems that the number of cases augments during dry periods or after inundations. Floods and Inundations&colon; 5&colon; Conflagrations.