In the mid-1950s, a research team headed by Michael Evenari set up a research station near Avdat (Evenari, Shenan and Tadmor 1971). He focused on the relevance of runoff rainwater management in explaining the mechanism of the ancient agricultural features, such as terraced wadis, channels for collecting runoff rainwater, and the enigmatic phenomenon of "Tuleilat el-Anab". Evenari showed that the runoff rainwater collection systems concentrate water from an area that is five times larger than the area in which the water actually drains.