8.G.9
9. Know the formulas for the volumes of cones, cylinders, and spheres and use them to solve realworld and mathematical problems.
How do water towers work?
A water tower is an incredibly simple device. Although water towers come in all shapes and sizes, they all do the same thing: A water tower is simply a large, elevated tank of water.
Water towers are tall to provide pressure. Each foot of height provides 0.43 PSI (pounds per square Inch) of pressure. A typical municipal water supply runs at between 50 and 100 PSI (major appliances require at least 20 to 30 PSI). The water tower must be tall enough to supply that level of pressure to all of the houses and businesses in the area of the tower. So water towers are typically located on high ground, and they are tall enough to provide the necessary pressure. In hilly regions, a tower can sometimes be replaced by a simple tank located on the highest hill in the area.
A water tower's tank is normally quite large. A normal inground swimming pool in someone's backyard might hold something like 20,000 or 30,000 gallons (that's a lot of water!), and a typical water tower might hold 50 times that amount! Typically, a water tower's tank is sized to hold about a day's worth of water for the community served by the tower. If the pumps fail (for example, during a power failure), the water tower holds enough water to keep things flowing for about a day.
One of the big advantages of a water tower is that it lets a municipality size its pumps for average rather than peak demand. That can save a community a lot of money.
Say that the water consumption for a pumping station averages 500 gallons of water per minute (or 720,000 gallons over the course of a day). There will be times during the day when water consumption is much greater than 500 gallons per minute. For example, in the morning, lots of people wake up at about the same time (say 7:00 a.m.) to go to work. They go to the bathroom, take a shower, brush their teeth, etc. Water demand might peak at 2,000 gallons per minute at 7 a.m.  there is a big cost difference between a 500gallonperminute pump and a 2,000gallonperminute pump. Because of the water tower, the municipality can purchase a 500gallonperminute pump and let the water tower handle the peak demand. At night, when demand normally falls to practically zero, the pump can make up the difference and refill the water tower.
Source: How Stuff Works https://people.howstuffworks.com/water.htm
Water towers are tall to provide pressure. Each foot of height provides 0.43 PSI (pounds per square Inch) of pressure. A typical municipal water supply runs at between 50 and 100 PSI (major appliances require at least 20 to 30 PSI). The water tower must be tall enough to supply that level of pressure to all of the houses and businesses in the area of the tower. So water towers are typically located on high ground, and they are tall enough to provide the necessary pressure. In hilly regions, a tower can sometimes be replaced by a simple tank located on the highest hill in the area.
A water tower's tank is normally quite large. A normal inground swimming pool in someone's backyard might hold something like 20,000 or 30,000 gallons (that's a lot of water!), and a typical water tower might hold 50 times that amount! Typically, a water tower's tank is sized to hold about a day's worth of water for the community served by the tower. If the pumps fail (for example, during a power failure), the water tower holds enough water to keep things flowing for about a day.
One of the big advantages of a water tower is that it lets a municipality size its pumps for average rather than peak demand. That can save a community a lot of money.
Say that the water consumption for a pumping station averages 500 gallons of water per minute (or 720,000 gallons over the course of a day). There will be times during the day when water consumption is much greater than 500 gallons per minute. For example, in the morning, lots of people wake up at about the same time (say 7:00 a.m.) to go to work. They go to the bathroom, take a shower, brush their teeth, etc. Water demand might peak at 2,000 gallons per minute at 7 a.m.  there is a big cost difference between a 500gallonperminute pump and a 2,000gallonperminute pump. Because of the water tower, the municipality can purchase a 500gallonperminute pump and let the water tower handle the peak demand. At night, when demand normally falls to practically zero, the pump can make up the difference and refill the water tower.
Source: How Stuff Works https://people.howstuffworks.com/water.htm
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