Pilot reported a loss of directional control that resulted in a runway excursion and damage to the a...

Attributes
ACN	1743581
Time
Date	202005
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Aeronca Champion
Operating Under FAR Part	Part 91
Flight Phase	Landing
Route In Use	Direct
Flight Plan	None
Person 1
Function	Pilot Flying
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Flight Instructor Flight Crew Commercial
Experience	Flight Crew Last 90 Days 43 Flight Crew Total 2350 Flight Crew Type 123
Events
Anomaly	Ground Event / Encounter Ground Strike - Aircraft Ground Event / Encounter Loss Of Aircraft Control Ground Excursion Runway

Narrative:

A wheel landing was made and the airplane was slowed without braking such that the tailwheel had been set down. At a speed of about 20mph; the left wing gained lift and the aircraft swerved to the right in a ground loop. Left rudder and left aileron inputs were made at the first indication of directional instability. The right main gear left the edge of the pavement and sank into the soft; wet surface; pulling the aircraft further to the right. The aircraft rolled forward into a drainage ditch approximately 6 feet deep containing low standing water; midway down the right side of the runway at an estimated speed of 10-15mph. Neither wing struck the surface; and the prop tips were not struck or damaged. When the aircraft nosed into the ditch; the front cowling was bent and the main landing gear were damaged. There were no injuries and there was no damage to property other than to the aircraft as described above.

Original NASA ASRS Text

Title: Pilot reported a loss of directional control that resulted in a runway excursion and damage to the aircraft.

Narrative: A wheel landing was made and the airplane was slowed without braking such that the tailwheel had been set down. At a speed of about 20mph; the left wing gained lift and the aircraft swerved to the right in a ground loop. Left rudder and left aileron inputs were made at the first indication of directional instability. The right main gear left the edge of the pavement and sank into the soft; wet surface; pulling the aircraft further to the right. The aircraft rolled forward into a drainage ditch approximately 6 feet deep containing low standing water; midway down the right side of the runway at an estimated speed of 10-15mph. Neither wing struck the surface; and the prop tips were not struck or damaged. When the aircraft nosed into the ditch; the front cowling was bent and the main landing gear were damaged. There were no injuries and there was no damage to property other than to the aircraft as described above.

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.