What is a common type of drilling rig used for water wells?

The selection of truck-mounted rotary rigs as a common type of drilling rig used for water wells is well-founded. These rigs are designed specifically for drilling in a variety of terrains and are efficient for reaching significant depths to access groundwater. Their mobility and versatility make them ideal for well-drilling applications. They typically feature a rotating drill bit that cuts through various types of soil and rock, enabling the creation of boreholes for water extraction.

Truck-mounted rigs also offer advantages such as easy transport to different job sites, the ability to be set up quickly, and the capacity to drill deeper than many alternative methods. This combination of features allows for effective and efficient water well construction.

Other types of drilling rigs mentioned, such as helicopter-mounted rigs, are generally used in more specialized situations where ground access is limited or difficult, making them less common for standard water well drilling. Hand-held augers are often used for shallow boreholes, which may not be suitable for deeper water wells where a substantial water source must be accessed. Sonic drilling rigs, while useful in certain applications, are not as frequently utilized for typical water well drilling due to their higher costs and specific operational requirements.