Last year whoever gives out the rain forgot to send any to Portugal so the rivers almost ran dry. The reservoirs where so low that properties that had been flooded when the reservoirs where built got forgotten.
I don't know how long it's been raining because i was away in the UK for a while. When it rains here sometimes the rain forgets to stop for days at a time.
The ground on the left of the picture for most of the years gets baked by the sun all day everyday. When the rain comes the ground to to hard to soak up all the rainfall and it just runs of into the drains.
This picture shows the effect of the rainfall washing what loose earth there may be.