How to Calculate the Volume of a Well

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# How to Calculate the Volume of a Well - PowerPoint PPT Presentation

How to Calculate the Volume of a Well. Introduction. Discuss which dimensions are needed. How to obtaining the dimensions. Example Alternative method. Goals of this Presentation. Establish the importance of properly calculating the volume of a well.

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### How to Calculate the Volume of a Well

Introduction
• Discuss which dimensions are needed.
• How to obtaining the dimensions.
• Example
• Alternative method
Goals of this Presentation
• Establish the importance of properly calculating the volume of a well.
• Describe the dimensions that are needed for the calculation and how to obtain them.
• Create a clear understanding of the calculations through an example problem.
• Describe alternate methods to completing the calculations.
Why is this important?
• The volume of the well is used to determine the amount of plugging material needed.
• The volume is also used to determine the needed amount of disinfectant.
• Assuming the wrong volume of the well could lead to many future problems.
According to the video what dimensions are needed in order to accurately calculate the volume of a well?
• Well diameter
• Total depth
• Depth of the water
Obtaining Well Dimensions
• Diameter of the well – measured distance across the inner lip of the well
• Total well depth – measured distance from top to bottom of well.
• Water depth – measured distance of depth of water in the well. (Tie a weight to some string and drop it to the bottom of the well. Retrieve the string and measure the portion of the string that is wet.)
Hand Dug Well Example
• You have large hand dug well that is 3 feet in diameter and is 45 feet deep. The depth of water in the well is 10 feet.
Hand Dug Well Example
• The volume of the well is calculated by the formula.

V = ((Π * D2)/ 4)* d

Where :

Π= 3.1416

D=diameter of well (feet)

d= depth of well (feet)

Hand Dug Well Example
• The volume of the well is

V= ((3.416* 32)/4) *45

V= 318.53 ft3

1 yd3 = 27 ft3

V= 11.79 yd3

Example
• An abandoned well is 6 inches in diameter, 100 feet in depth, and the water level is 40 feet.
Example
• The volume of the well is

D= 6in/ 12in/ft = 0.5 ft

V= ((3.416* 0.52)/4) *100

V= 19.62 ft3

Alternate Method
• Use Table 1 Plugging Material Calculation Sheet.
• And the diameter of the well.
Alternative Method
• Bags of cement needed (94 lb per sack)

100 feet / 7.2 feet = 13.8 sacks

• Bags of Bentonite needed (50 lb per sack)

100 feet / 3.5 feet = 28.5 sacks

Conclusion
• Well depth, diameter, and depth of the water are all needed in calculating the volume of the well.
• How to obtain these dimensions.
• There are several ways to calculate the amount of plugging material that is needed.