Which statement best describes hydraulics in irrigation design?

• A. Electrical wiring for controllers.
• B. Pressure, flow, and pipe sizing to deliver water to zones.
• C. The study of plant diseases.
• D. Placement of decorative features.

Answer: (B)

Hydraulics in irrigation design is about how water moves through the system: the pressure needed, the flow rates to each zone, and how pipe sizing and layout influence delivering water efficiently. It focuses on ensuring there is enough pressure to push water through mains, laterals, valves, and emitters, while accounting for friction losses and elevation changes so every zone receives the intended amount. By sizing pipes and routing them correctly, you maintain consistent pressure across zones, avoid under- or overwatering, and keep water use efficient. This concept is distinct from electrical wiring for controllers, plant disease studies, or placing decorative features, which fall into electrical systems, plant pathology, and landscape aesthetics, respectively.