Plants like reed can grow well in these trenches, as you can see. Farmers will often use a bulldozer and make row after row of these trenches. Something very uncommon happened this week in Wadi Natrun. Several days this week it has rained. This picture shows standing water just outside of the town.
Rain is rare enough here that people are generally unprepared for it.
Observe Dr. Carroll here getting rained on. He's having a good time.