Definition & Operational Usage of Water Supply Plan
What Is Water Supply Plan?
A water supply plan is the strategic component of the Incident Action Plan detailing primary and secondary water sources, hose lay routes, relay pump positions, and backup supply contingencies for an emergency incident.
⚠️ Operational Safety Warning:Apparatus tank water (usually 500 gallons) lasts only 2.5 minutes when flowing a 200 GPM line. Secure continuous supply immediately.
Why Water Supply Plan Matters on the Fireground
Planning water supply ahead of time prevents initial supply failure. A formal plan ensures seamless transition from engine tank water (500 gal) to pressurized hydrant or relay supply.
Relevant NFPA Standards
- NFPA 1010: Standard on Professional Qualifications for Firefighters
- NFPA 1550: Standard for Emergency Responder Health and Safety
Field Procedures & Tactical Steps
- Identify primary water source (hydrant, draft point) during pre-incident planning.
- Specify initial supply lay route for first-due and second-due engines.
- Establish secondary backup water source in case primary main fails.
- Assign relay pumpers for long supply lays (> 500 ft).
- Review water supply plan with all responding officers during pre-briefings.
Common Context & Application
Formulated during pre-incident planning for commercial hazards and executed during initial structure fire size-up.
Frequently Asked Questions about Water Supply Plan
How long will a 500-gallon engine booster tank last at a flow rate of 175 GPM?
At 175 GPM, a 500-gallon booster tank will be completely empty in approximately 2 minutes and 50 seconds of continuous flow.
What is a hydrant supply lay?
A supply lay is the deployment of Large Diameter Hose (LDH) from a hydrant to the engine (forward lay) or from the engine to the hydrant (reverse lay).
Other Names for Water Supply Plan
water resource planhydrant strategydrafting plan
Water Supply Plan may also appear in training materials, NFPA standards, or department SOPs as: water resource plan, hydrant strategy, drafting plan.
Relevant Tools
Operational calculators related to Water Supply Plan:
Category:Fireground Operations
— Core tactics, command, suppression, ventilation, search, and water supply terminology used on the fireground.