"Rotary drilling uses a sharp, rotating drill bit to dig down through the Earth’s crust."

To keep loose sand and gravel from collapsing into the borehole, it is necessary to use well casing and screen. The screen supports the borehole walls while allowing water to enter the well; unslotted casing is placed above the screen to keep the rest of the borehole open and serve as a housing for pumping equipment.

Explore proper well development using air with columnist Thomas Kwader.