THE PILOT MADE A TRAFFIC PATTERN APPROACH AND LANDED USING RUNWAY 26. DURING ROLLOUT, THE PILOT ENCOUNTERED AN ESTIMATED 10 KNOT LEFT CROSSWIND FROM ABOUT 180 DEGREES. THE AIRPLANE VEERED OFF THE RUNWAY, ENTERED A DITCH AND NOSED OVER. THE PILOT STATED THAT HE HAD NOT EXPEREINCED ANY MECHANICAL PROBLEMS WITH HIS AIRPLANE. THE PILOT REPORTED TO A RESPONDING SHERIFF THAT HE HAD LANDED DOWNWIND.