Waal River reached historical low level amid heatwave during dry summer. Footage filmed in Nijmegen on Sunday shows water level indicator signs not even touched by the river’s water as shallowed Waal has houseboats standing on dried river bed. « This year the water is the lowest I have ever seen here and it has been low in the past. I think five years every summer. It is really low and then all the boats here, they hit the grounds, » said houseboat owner Esther. Earlier on Wednesday, July 3utch government declared national water shortage during dry summer and assembled a national team to control water usage.