What is the volume of water that a 150' well can hold?

• A. 120 gallons
• B. 150 gallons
• C. 180 gallons
• D. 200 gallons

Answer: (B)

The volume of water in a well depends on the size of the bore (the cross-sectional area) and how deep the water column is. Think of the water in the well as a cylindrical column: volume equals the bore area times the water depth, and you convert that cubic footage to gallons.

In practical terms: V_gallons = 7.48 × (pi × (D/2)^2) × h, where D is the bore diameter in feet and h is the depth of the water column in feet. If you only know the depth (150 feet) and nothing about the bore diameter, you can’t determine a numeric volume.

For example, with a common six-inch bore (D = 0.5 ft), the full 150-foot column would hold about 221 gallons. With a smaller four-inch bore (D = 0.333 ft), it would be about 98 gallons. These illustrate how much the answer depends on bore size.

So, the question as stated is missing essential information (the bore diameter), which is why you can’t definitively pick a single numeric volume from the options. The given answer would require assuming a specific bore size that isn’t provided.