How much does a wet runway increase aircraft landing distance?

Under standard dispatch rules, a smooth wet runway requires at least a 35% to 40% increase over unfactored dry landing distance (multiplier of ~1.35x to 1.40x), plus a mandatory 15% operational safety margin.

What is dynamic hydroplaning and when does it occur?

Dynamic hydroplaning occurs when standing water (depth > 3mm) builds a wedge in front of the tire, lifting it completely off the pavement. The minimum dynamic hydroplaning speed in knots is roughly calculated as 9 times the square root of the tire pressure in PSI (9 × √PSI).

FAA TALPA / RCAM Surface Matrix

Contaminated Runway Landing Distance Calculator

Calculate landing rollout distances on contaminated surfaces. Select FAA Runway Condition Codes (RWYCC 1–6) for rain, slush, snow, and ice, including 15% safety dispatch factors.

FAA TALPA / RCAM Runway Surface Condition

POH Unfactored Dry Landing Distance (Feet)

Reported Runway Condition Code (RWYCC)

Thrust Reversers Inoperative (MEL dispatch penalty)

Total Required Runway Length (With 15% Buffer)

3,416 ft

Factored ground roll: 2,970 ft (Multiplier: 1.35x) + 446 ft FAA safety buffer.

Reported Braking Action:Good

Hydroplaning Hazard: LowWet runway requires at least 35% increased landing distance over dry unfactored distance.

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The FAA Takeoff and Landing Performance Assessment (TALPA) initiative introduced the Runway Condition Assessment Matrix (RCAM). It replaces subjective pilot braking action reports with objective Runway Condition Codes (RWYCC from 0 to 6) based on contaminant type, depth, and temperature.