A watermark is a specific water level (measured in feet above MSL) that the lake can rise to or fall to before triggering LLA to send you an alert email. You will set a watermark for every alert you create using controls like the set shown below .
Alert me when my lake a level of ft. MSL.
Consider these questions:
Once you formulate answers to these questions and compare them to the current water level of your lake, the watermark that you should set for your alert will become more obvious.
Below are some suggestions for identifying the watermarks for your alerts.
Simple Observation MethodThe easiest method of determining a watermark settings for a specific alert is observation. Seeing your dock or boat in its current state can help you determine what watermark to set for your alert.
For example, if your dock is grounded currently and you know that the current level for your lake is 650 feet MSL; How many vertical feet will the lake need to rise before your dock floats again? You can certainly take an educated guess to determine this answer.
If the lake rises 2 vertical feet to 652.00ft. MSL, do you think that your dock will be floating? If so, create a rising to or above alert with the watermark set to 652.00ft. for your dock.
So, this alert might be titled Dock Alert and have the watermark controls set to read - Alert me when my lake rises to or above 652.00 Ft. MSL.The observation method might require a little fine-tuning once you see lake levels actually rise or fall to safe levels.
The "Eye Ball It" method to determine a rising water level watermarkThis method works well for a dock or boat that is currently grounded and is a simple and fairly accurate way of estimating the number of feet the lake needs to rise to get the object floating again. We are going to base this estimate off of your height. This technique may sound silly but it is fast, easy and usually requires no additional tools.
Drop line method to determining a falling water level watermarkThis technique works best when your dock or boat is still floating. You will determine how low the lake level can drop before you need to move your dock or boat out from its current floating position assuming your dock is not fixed into position. A tape measure can be used in place of the drop line if you do not mind getting your tape measure wet.
To set the falling water level watermark for your lake level alert, simply check to see what the current lake level is for your lake and subtract the number of feet and inches that you measured. Give yourself a slight buffer from the absolute lowest level by adding 6 inches back into the final number. You now have a safe watermark for your alert and will be alerted each time the lake level drops to within one foot of the level at which your dock or boat would be grounded.