Sloshing

Give the path of the water a lot of respect. One can take a bowl or dish and fill it with water. Holding it over the sink - slosh it back an forth. Note it doesn't take much motion to empty the bowl or dish while well below expected pole shift level motions. In like manner plan on all of the water leaving small reservoirs and lakes you are looking at. As a worst case look at the path the water would take if it all came in the direction you wish to live. Mentally mock up the water in the original reservoir literally sloshing around out of control, running in different direction. The water running over the land mostly seeking low land, sometime sloshing to higher land. The point is after the pole shift, I doubt any water will be left in many lakes and reservoirs. Theoretically, the side that will probably get the most water or the biggest slosh should be the side closest to the stopping direction of the shift. The next side to get the most water would be the opposite side. As the body of water gets bigger then it begins to act like an ocean with multiple large tidal waves.

Offered by Mike.

If something falls into the lake or if the bottom collapses somewhere, there will be a tsunami wave that will propagate toward the shore from the point of disturbance. The height of the wave will vary upon the volume of moved material first, then the wave shape and height with depend on various parameters, as the lake average depth, the distance travelled, the bottom slope near the shore, and the lake general morphology. The worst situation would be a long deep narrow Lake with vertical side shores and a smooth slope at the other side with people there. Other dangers of high waves in a lake are more generally due to weather conditions like local storms with high pressure gradients that move around the lake. You may have sudden water level rise of several feet on the other side of the lake when the storm leaves, with eventually waves upon that.

Offered by Veronique.

This happens once in awhile on the Great Lakes. Just last year, there was a "wave" that crashed into the Traverse City area 6 feet above normal. There was no storm, an otherwise calm day.

Offered by John.