How to Understand how a basement sump pump works

This video is from AskMeDIY and covers how basement sump pumps work to keep your basement dry. The sump pump fits underneath the basement below the concrete slab. The sump pump in the video pumps 2,000 gallons per hour. The presenter turns the pump off to demonstrate how quickly the water would fill in with the pump off. He contends that the basement would be flooded in only three minutes if the pump would malfunction. The pump is plugged into a GFI protected outlet and the pump outlet flows through PVC out of the house. The video finishes up by explaining how rain water flows around the basement slab to collect under the basement slab.