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You could create a river that was a good distance from the houses so all of the stuff would fall into the river.  My other idea is that you could move all houses away from the mountain to a safe place

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create a wall

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The answers I cam up with while brainstorming was (and some ideas may seem a bit silly but) anyways, my ideas were
A. Maybe put a cover over the rocks somehow that will absorb the rain so it doesn't get to the rocks.
B. Use less water maybe and just let natural things happen.
So those are my ideas and I'm still brainstorming of thinking of more ideas about this situation.