WRT115 – Water Technologies Calculations

WRT115 Module 2 Page 1
GateWay Community College

Module 2
Math Review-Flow, Velocity, and Pumping Calculations
Name: ___________________________________________
Please answer the following questions/problems by including complete answers and providing
all of the steps in finding the answer. Provide the definitions/equations/proportions/ratios used to
solve for the problem. You will need to show all your calculations (not just the answer) to
receive full credit. You may use any figures/graphs to support your answers. Do not be limited
to the blank space provided to provide your answers.
1. Provide the complete equation for Velocity. You will also need to include the correct units to
receive full credit.
2. A sensor travels 210 feet in a basin in 6 minutes, 12 seconds. What is the velocity in the
channel in feet per second?
3. A sensor is placed in a waterway and travels 386 feet in 3 minutes. What is the velocity of the
wastewater in the waterway in feet per minute?
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4. Provide the complete equation for determining “Flow in a channel (Q). You will also need to
include the correct units to receive full credit.
5. A waterway is 72 inches wide and has water flowing to a depth of 4 feet. If the velocity of the
water is 3.9 feet/second, what is the flow in the channel in cubic feet per second?
6. One cubic foot of water weighs how many pounds (lbs)? How many gallons are contained in
one cubic foot of water? One cubic inch of water weighs how many pounds (lbs)? PSI stands
for what?
7. With regard to columns of water, if a column of water is 2.31 feet high and exerts 1.0 psi,
you would need a water column of how many feet to produce a pressure of 40 psi?
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8. Define the term head and provide an example:
9. Define Stevin’s Law and include the correct units/terms to receive full credit:
10. Answer the following questions:
A: True or False: The numerator is always included in the bottom portion of an equation?
B: True or False: Influent and effluent mean the same thing?
C: True or False: Pumps utilized in both wastewater and water treatment are the same?
D: True or False: Water and Wastewater Operators do not need to know how to perform
basic pumping calculations?