I started a thread about it:
http://www.bikeforums.net/showthread...22-RIP-Ergosum
Looks like from the data I was going about 20-30, as I had slowed down for a water crossing. The crossing ended up not having water in it so I didn't slow as much as I would have otherwise, and didn't notice the hole until it was too late.
Jeez Louise, good to hear you pulled that one off. Excellent cycling skills I'd say.