Super king air pilot reported hydroplaning on landing and hitting a runway light.

Attributes
ACN	1572503
Time
Date	201808
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	Super King Air 300
Operating Under FAR Part	Part 91
Flight Phase	Landing
Route In Use	Visual Approach
Flight Plan	IFR
Person 1
Function	Pilot Flying Single Pilot
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine Flight Crew Instrument
Experience	Flight Crew Last 90 Days 50 Flight Crew Total 14000 Flight Crew Type 850
Events
Anomaly	Ground Event / Encounter Object Ground Event / Encounter Loss Of Aircraft Control Ground Excursion Runway

Narrative:

Upon landing; aircraft hydroplaned as was evident by the photographs that were taken the following morning. There were rain showers in the area; and the runway appeared wet on landing. The left main and nose landing gear slid off the side of the runway and became stuck in the mud. After touchdown; the aircraft felt like it was on ice; and started drifting left. With the power levers at idle; I applied right rudder to try to realign the aircraft on the centerline of the runway.in conclusion; had the runway been grooved this incident would not have occurred. There was minor damage to the aircraft from hitting a runway edge light.

Original NASA ASRS Text

Title: Super King Air pilot reported hydroplaning on landing and hitting a runway light.

Narrative: Upon landing; aircraft hydroplaned as was evident by the photographs that were taken the following morning. There were rain showers in the area; and the runway appeared wet on landing. The left main and nose landing gear slid off the side of the runway and became stuck in the mud. After touchdown; the aircraft felt like it was on ice; and started drifting left. With the power levers at idle; I applied right rudder to try to realign the aircraft on the centerline of the runway.In conclusion; had the runway been grooved this incident would not have occurred. There was minor damage to the aircraft from hitting a runway edge light.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.