We’ve got some friends who have two sump pumps. One is a backup and sounds an alarm when it is switched on. But this only works as long as they’re home to hear it. [Felix Rusu] came up with a solution ...

[Matt] literally finds himself in a sticky situation. There’s an oil slick in his sump well. These wells work in conjunction with drain tiles to pump water away from the foundation of a house.

Flood sensors don't need bells and whistles to work well; they just need to tell you when your basement is flooding. You can make your own flood sensor and alarm for a couple bucks, but if you want ...