The first two weeks of April brought the third highest rainfall to San Diego, about 1/3 of our average annual rain. Because it occurred over two weeks, the ground never had a chance to dry.
We found that one retaining wall behind the house and beneath the deck had collapsed and the concrete sidewalk behind the house had sagged away from the house and cracked even more.
Tomorrow the landscape company that cleared the canyon of junk plants and built the terraces that now hold the RC tracks will come to rebuild the walls and sidewalk.