Thanks to new equipment, the U.S. Army National Guard’s 257th Engineer Team drilled four water test wells in different locations in the republic of Djibouti, a small country in northeast Africa.
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.