Bored wells, constructed with an auger driven into the earth, are limited in depth to approximately:

• A. 30 ft
• B. 60 ft
• C. 100 ft
• D. 150 ft

Answer: (B)

Bored wells created using augers are generally limited in their effective depth due to several factors related to the method of construction and the equipment used. When utilizing an auger, the excavation process involves the mechanical drilling of soil, which is feasible only to certain depths without encountering significant difficulties.

Typically, bored wells reach depths of up to approximately 60 feet when using this method. Beyond this depth, the auger may face challenges such as reduced effectiveness in drilling due to increased soil cohesion or encountering harder rock formations that the auger is not designed to penetrate. Additionally, at greater depths, the risk of cave-ins and issues related to removing cuttings from the wellbore increases significantly, thereby making further advancement both difficult and risky.

For these reasons, the depth limit of around 60 feet is well-established for bored wells constructed with augers, as it balances the mechanical capabilities of the equipment used and the practical considerations of maintaining the integrity and safety of the well structure.