Compare drafting from a static water source to pumping from a hydrant, highlighting one key advantage of hydrant supply.

• A. Drafting relies on suction from a static source; hydrant supply provides pressurized, ready-to-use water that typically allows higher and more reliable flows with easier priming.
• B. Hydrant supply requires more priming than drafting.
• C. Hydrant supply eliminates the need to consider friction losses.
• D. Hydrant supply reduces the need for discharge pressure.

Answer: (A)

The key idea here is that hydrant water is already pressurized, so the pump can deliver water without having to fight against suction limitations. Drafting from a static source requires the pump to create suction to lift water from the source, which is limited by atmospheric pressure, the height of the water column, and the risk of losing prime if air enters the line or the source level drops. A hydrant connection taps into a pressurized water main, giving you ready-to-use water that’s readily available at higher and more reliable flows with less effort to prime.

That’s why hydrant supply is described as providing pressurized, ready-to-use water that typically allows higher and more reliable flows with easier priming. The other statements don’t fit because hydrant systems don’t inherently require more priming, they don’t eliminate friction losses in hose and piping, and they don’t reduce the discharge pressure needed to overcome system resistance.