Which statement about friction loss charts is true?

• A. They are not used for hose length calculations.
• B. They depend only on the color of hose.
• C. They are not applicable to modern hoses.
• D. They show friction loss per 100 ft for a given GPM and hose size.

Answer: (D)

Friction loss charts quantify how much pressure is lost as water flows through a hose at a specific diameter and flow rate. The key point they provide is friction loss per 100 feet for a given GPM and hose size, so you can estimate the total loss by multiplying that per-100-foot value by the actual hose length (in hundreds of feet). This makes the statement describing the per-100-foot value for a given GPM and hose size the accurate one. The other options miss how these charts are used: the color of the hose has no impact on friction loss, modern hoses still use these charts, and you do calculate total loss for a hose run by scaling the per-100-foot figure to length.