Thank the environmentalists for this. Years ago San Diego installed concrete lined drainage canals to handle storms like this. But over the years they filled with dirt and debris and non-native trees started growing in the canals. The environmentalists screamed that removing those trees was wrong so the trees stayed and the canals filled with more dirt and debris. When these storms hit the water couldn't drain in the canals so it overflowed into the neighborhoods.
Of course Brandon will say it's all Trumps fault, because Russian and 1/6 and stuff.