Arctic amplification is the observed phenomena that the polar regions are warming twice as fast as tropical ... this means there's less force acting on the atmosphere, and thus less power ... the likelihood of more powerful storms is, therefore, reduced ... we should expect more rainfall, but the rainfall will be more widely distributed, making floods less likely ...
Those houses were built in the 100-year flood plain before we identified that land as in the 100-year flood plain ... 100 years ago ... so do the math ...
ETA: "More" is a weasel word ... this extra rainfall will be slight ... no where close enough to solve our current water problems, let alone our water problems 100 years hence ... conserve please ...