orriculum:

a water based spell to stop or slow events, or to push someone back. 

To “Stem the Tide” is a nautical expression to describe ships sailing against the tide of the water, that was slowly them down. 

🌊  gather: crushed rosemary, a divination board, a representative object. 

* a divination board can be a pendulum board, ouija board, anything that has various answers

🌊  go to bathwater or a puddle, other body of water if you are landlocked.

🌊  weigh the divination board down at the bottom. 

🌊  sprinkle crushed rosemary over the water

🌊  place the representative object to float in over the center of the board. 

🌊  gather energy around your hands, perhaps even with a tempest spell. 

🌊  using your hands, influence and push the tide to move where the object is over the board. the object is like the planchette or pendulum for the board, but you are giving it the answers. 

🌊  though you cannot change the entire tide or command where a wave crashes, you affect the waters in your own way, making ripples and splashes.