Available Water Flow

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Available Water Flow

• Meter Size
• Typical flow depending on size
• 5/8 12 GPM
• ¾ 15 GPM
• 1 20 GPM

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Available Water Flow

• Determine available flow with Bucket Test
• Water meter measure at backflow preventer

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Available Water Flow

• Bucket Test
• Pump measure at pump

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Bucket Test

• (5 gallons / seconds to fill) X 60 seconds
• Gallons per Minute (GPM)

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Available Pressure

• Pounds per Square Inch (PSI)
• Static PSI
• Pressure when water not moving
• Measure with PSI gauge on water spigot (meter)
• Operating PSI
• Pressure during operation

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Low Pressure.
High Pressure..
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High Pressure
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Low Pressure
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Low Pressure
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Low Pressure
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Pressure Measurement
Pressure gauge
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Pressure Gauge (Pitot Tube)

• Measure operating pressure

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Water Pressure
Created by

• Elevation
• Weight of water

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Water Pressure

• 1 of elevation (head) 0.433 psi
• In irrigation terms, 1 of elevation is referred
  to as 1 of head

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Water Pressure

• 2.31 of elevation 1 psi

2.31 ft.
1 psi
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Pressure and Container Size
A
B
C

• What (relatively) will be the pressure at the
  base of various containers?
• Same for all (only the height of water column
  determines the pressure )

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