A typical ECG in AF shows no P waves and an irregular ventricular rate. AF is often treated with medications to slow the heart rate to a near normal range (known as rate control) or to convert the rhythm to normal sinus rhythm (known as rhythm control). Electrical cardioversion can also be used to convert AF to a normal sinus rhythm and is often used emergently if the person is unstable.
How does a water tower work? Water towers provide extra water storage for a town's water supply. They hold about a day's worth of water, so if the town's pumps fail (like during a power outage), the water tower acts as a backup water supply.
When water is not at peak demand, water is stored in the tower. When it's at peak demand, the city's pumps can only handle so much, and the rest is fed in from the tank at the top of the tower. This helps a community maintain consistent water pressure, no matter what the demand may be.