Wastewater math
Tank Area Formulas for Wastewater Operators
The area of rectangular and circular tanks.
The formula
Formulas
Rectangle area
Area = length × widthWPI Formula/Conversion Table (2023), Printed page 1 of 10, Area of Circle and Area of Rectangle
Circle area from diameter
Area = 0.785 × diameter²WPI Formula/Conversion Table (2023), Printed page 1 of 10, Area of Circle and Area of Rectangle
Circle area from radius
Area = π × radius²WPI Formula/Conversion Table (2023), Printed page 1 of 10, Area of Circle and Area of Rectangle
Worked example
Step by Step
A rectangular basin floor is 15 ft long and 9 ft wide. What is its surface area?
What Do We Know?
Length is 15 ft and width is 9 ft.
What Are We Finding?
Find the two-dimensional surface area in square feet.
Identify the Shape
The surface is a rectangle.
Choose the Formula
Area = Length × Width
Put In the Values
15 ft × 9 ft
Check the Units
Feet times feet gives square feet (ft²).
Answer
135 ft²
Answer: 135 ft²
Practice
Try It Yourself
Practice this math in the Math Center, with hints and worked steps.
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