Flooding is definitely a major concern in the Bay Area.
One of the other things you want to make sure is that you have cast insurance which will provide you with the insurance to cover any cast members in the event there's any delays in filming.
Depending on the size of the event it will take some time before someone can come out.
In California, there are about 260,000 people who have flood insurance. That's a small number when you compare it to the about 12.5million homes in the state.
