Water is stored in a tank sketched in the figure below to support the demand of a nearby community area. The system is designed so that pressure at the location B always lies in the range of 330 to 440 kPa (gauge). Water demand fluctuates between 0.3 and 1 m³/s regardless of pressure at B. The supply pipe of 600 mm diameter and 1 km length between A and B is made of steel and has the equivalent sand roughness of 1 mm. Although not shown in the figure, the supply pipe has five 90° bends, each having the head loss coefficient of 0.8. The figure shows that the bottom end of the tank is located 42 m above the ground, and the pipe is buried 1.5 m below the ground. A pump system regulates so that the tank keeps the same water level all the time. Assume water at 20°C, and air in the storage tank has the atmospheric pressure. To meet the design criterion for pressure at B, what should be the depth of water h in the storage tank?
Water is stored in a tank sketched in the figure below to support the demand of a nearby community area.
The system is designed so that pressure at the location B always lies in the range of 330 to 440 kPa (gauge).
Water demand fluctuates between 0.3 and 1 m3/s regardless of pressure at B. The supply pipe of 600 mm
diameter and 1 km length between A and B is made of steel and has the equivalent sand roughness of 1 mm.
Although not shown in the figure, the supply pipe has five 90◦ bends, each having the head loss coefficient
of 0.8. The figure shows that the bottom end of the tank is located 42 m above the ground, and the pipe is
buried 1.5 m below the ground. A pump system regulates so that the tank keeps the same water level all the
time. Assume water at 20◦C, and air in the storage tank has the atmospheric pressure. To meet the design
criterion for pressure at B, what should be the depth of water h in the storage tank?
![2. Water is stored in a tank sketched in the figure below to support the demand of a nearby community area.
The system is designed so that pressure at the location B always lies in the range of 330 to 440 kPa (gauge).
Water demand fluctuates between 0.3 and 1 m³/s regardless of pressure at B. The supply pipe of 600 mm
diameter and 1 km length between A and B is made of steel and has the equivalent sand roughness of 1 mm.
Although not shown in the figure, the supply pipe has five 90° bends, each having the head loss coefficient
of 0.8. The figure shows that the bottom end of the tank is located 42 m above the ground, and the pipe is
buried 1.5 m below the ground. A pump system regulates so that the tank keeps the same water level all the
time. Assume water at 20°C, and air in the storage tank has the atmospheric pressure. To meet the design
criterion for pressure at B, what should be the depth of water h in the storage tank?
Storage tank
h
42 m
1.5 m
1
Supply pipe
B
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