Comment by graycat

> I don't understand what you mean.

I explained in (2). The main point in (2) is that ALL the people in the threatened area, right on the street they ARE, where they live, work, shop, walk, whatever, get LOUD SIRENS, REALLY LOUD, to warn them and also transportation OUT'A there.

Alerts on cell phones, TV, radio, newspapers, "water stream gauges", etc. leave HUNDREDS of people, including a camp full of girls and counselors, still ASLEEP and now "missing" or "DEAD". As in (2), we need to WAKE them, everyone, UP and get them OUT.

There may be proposals to install flashing lights, bells, whistles, sirens, etc. on phone poles, etc., but in the ~60 years to the next such flood such means will likely be rusty, broken, dead, etc. Sooooo, (2) just has people alive at the time of the flood THEN using the cars, trucks, horns, sirens available and working THEN to solve the problem.