Web alarm clock for 8:22 a.m.
After escorting the children across the flooded street, you can finish up, dry off, and leave at 8:22 am. Set the alarm before putting your phone away so the morning does not run unnoticed toward 9:00 am. That gives you a clear stopping point after checking that everyone has reached the other side safely.
With traffic, splashing water, rain on a roof, and people calling to one another, a quiet alert may disappear into the background. Choose a volume you can hear over the noise and keep the phone close rather than buried inside a bag. Test the sound once if conditions are loud. The alarm for the flooded street will not sound if you close this browser page or let the phone sleep, so keep both active until the alert has played.
Once the children are across, listen for how the street changes as the early commute builds. By 8:22 am, engines, tricycles, school traffic, and rainfall can make spoken directions harder to catch than they were earlier. Stand where you can see each child reach dry ground, use short hand signals when voices are masked, and make your final headcount before leaving.