WETS Irrigation Technician Practice Exam

Keep the emission device a small, dedicated distance from hardscape to ensure water goes into the planting bed and not onto sidewalks, patios, or driveways. Four inches is the recommended spacing because it places the device close enough to deliver water effectively to the desired area while reducing the chance of spray or runoff onto non-target surfaces. If it sits too close, like two inches, water can spray onto the hardscape, creating slippery surfaces and wasted water. If it’s farther away, such as six or eight inches, the spray pattern may reach the hardscape anyway or miss the planting area, leading to uneven coverage. Four inches balances efficient irrigation with protection of the hardscape.