Very heavy adobe, (Clay). Where 21Dog is it's more sandy... they can handle a lot more rain than we can. Here... the ground simply can't absorb water quickly, at all.
An inch of rain and we're flooded... BUT... I don't mean 'flooded' in the sense that most in the USA use it... like a foot deep in your living room. I mean the ground is saturated and stays wet for days upon days, weeks, even months with heavy rains.
We're in the middle of harvest... 21Dog is right, couldn't come at a worse time. Both damage to the crops and an inability to get into the fields even after the rain stops.
That said, I was in a flood threat (the foot deep in your living room type) most of this year - but that was due to the snow runoff and the inability of our river system to handle that much water.