According to the pilot, he was departing from runway 17 at the end of a 500 foot displaced threshold. While accelerating, the right wheel went through a shallow pool of standing water on the runway, which caused the airplane to veer to the right. The airplane continued into the grass down a slope and impacted the base of the slope. Examination of the airplane revealed that the left canard (front wing) broke at the mid-span of the wing. The pilot did not report any preaccident mechanical malfunctions or failures that would have precluded normal operation. Examination of the standing water revealed that it was approximately one inch deep, and according to the airport manager, it is due to a run off stream under the runway. A review of the airports AWOS and NOTAMs revealed that the standing water was not reported.