What are fixed and mobile water supplies?

• A. Fixed: hydrants, pools, lakes; Mobile tenders/tankers and fire apparatus, but with limited supply.
• B. Fixed supply is only hydrants; Mobile supply is unlimited.
• C. Fixed supply refers to water from aircraft; Mobile supply is from fire trucks only.
• D. Fixed supply is from rainwater cisterns; Mobile supply is from river pumps.

Answer: (A)

In airport firefighting, water sources are grouped into fixed and mobile supplies. Fixed water supplies are those that are permanently in place and can deliver water to the scene without needing to be moved. This includes hydrants tied into the airport or municipal water system, and natural or man-made bodies of water like pools and lakes that can be drafted from or connected to for a steady source.

Mobile water supplies, on the other hand, are carried by vehicles that bring their own water to the incident. These are water tenders or tankers and other fire apparatus that transport water to the scene, but they have a finite amount of water per load, so the overall supply may be limited and often needs refilling from fixed sources or other mobile units to sustain operations.

That makes the described pairing correct: fixed supplies include hydrants, pools, and lakes, while mobile supplies consist of tenders/tankers and other apparatus carrying limited water.