I was finally able to search the picture you linked, it was from the Scablands. It is hard to say how many floods it took to make that particular canyon. As I already pointed out the channeled scablands were made by a series of post glacial floods:
That probably did not happen in just one year:
"When the topsoil was all washed away the floodwaters scoured thousands of square miles of basalt bedrock and created the coulees we see today. Once Glacial Lake Missoula drained and the flood stopped, the ice dam gradually formed again and the glacial lake was re-created. Eventually, the second ice dam collapsed and another mega flood was unleashed. Geologists believe this happened more than forty times over a period of several thousand years, and only stopped when the last ice age ended. Each mega flood compounded the erosion of the previous one and culminated in the bizarre landforms we now call the Channeled Scablands."
Please note, more than forty, not one.
Channeled Scablands
If you relied on a creationist source for your information they probably lied to you.
Now do you want to discuss the photo that I linked. Now that I am home I can do it properly: