What is the 50-90 rule in kayaking?
Rule gives you “… the SPEED OF THE CURRENT at the end of each hour. Counting from slack, the current will flow at 50% of its maximum speed at the end of the first hour, 90% at the end of the second hour and full 100% or maximum speed at the end of the third hour and then back to zero with the same steps. The 50/90 rule states that: We expect zero flow speed as the tidal stream changes direction (slack water) One hour later, the flow attains 50% of maximum speed. Two hours after slack water, the flow attains 90% maximum speed.The 50/90 Rule What happens to the flow of the tide is approximated by a so-called 50/90 rule. Initially there is no flow; this is known as slack water. At the end of the first hour, the tidal stream reaches 50% of its maximum speed, at the end of the second hour, 90%, and at the end of the third hour, 100%.