Flow Rate Calculation
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Flow Rate Calculations: Determining Gallons Per Minute and Volume, Study notes of Chemistry
Formulas and examples for calculating flow rates and volumes of water in various units. It covers the calculation of flow rate using the formula Flow Rate = Volume ÷ Time, and the conversion of units such as cubic feet, gallons, and minutes. The document also includes examples of solving math problems related to flow rate and volume.
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Flow Rate Calculation
Calculating Flow Rate
How many gallons drained from this tank?
What is the detention time in this basin?
How much water went into storage?
How long will the water last?
WEIGHT
VOLUME
FLOW
TIME
VOLUME
FLOW
TIME
WEIGHT
DENSITY
VOLUME
VOLUME AREA
HEIGHT
FLOW
AREA
VELOCITY
LB/DAY MGD
mg/L
Measurements1.0 ft
3
=
7.48 gal
Number
Unit
Flow Rate Units
Volume:
Cubic Feet (ft x ft x ft)
Time:
Seconds
When divided,
Flow Rate:
Cubic Feet per second
(cfs)
Flow Rate Units
Volume:
Million gallons
Time:
Day
When divided,
Flow Rate:
Million gallons per day
(MGD)
Solving Math Problems
Read the Problem –
Twice!
Simplify the QuestionIdentify the FormulaFind the “Variables”
Flow Rate Problem
In 60 minutes, a water tank’s volume increases
by 4,200 gallons. What is the flow rate ofwater filling the tank? Flow Rate =
VolumeTime
Flow Rate =
4,200 gal60 min
70 gallons per minute
Flow Rate Example – I
In four hours, a water tank’s volume increases
by 24,000 gallons. What is the flow rate ofwater filling the tank?
Question:
What is the Flow Rate?
Formula:
Flow rate = Volume ÷ Time
Flow Rate Example – IIHow many gallons of water can be pumped
into a water tank in six hours, if thepumping rate is 2000 gallons per minute?
Question:
What is the Volume?
Formula:
Volume = Flow Rate x Time
Flow Rate Example – IIHow many gallons of water can be pumped
into a water tank in six hours, if thepumping rate is 2000 gallons per minute? Volume
2,000 gal
6 hours
60 min
1 min
1 hour
720,000 gallons
Flow Rate Example – IIIHow long will it take to completely drain a
full, 200,000 gallon water tank, if the drainrate is 5000 gallons per minute? Time
200,000 gal
1 min5000 gal
40 minutes
Invert and Multiply
Flow Rate Example – IVA storage tank that is 100 feet wide by
150 feet long with a water depth of 25
feet drains completely in 46. minutes. What was the flow rate
(gpm) during this draining
operation?
Flow Rate
=
Volume ÷ Time