Without knowing the exact details of how you found the height of the water in the swimming pool, it is difficult to determine if your method was the most efficient. In general, some of the more efficient methods would involve:
• Using a measuring tape or ruler attached to a pole and lowering it into the water to read the depth directly. This is a simple method with minimal error.
• Using a depth sounding device specifically designed for measuring water depth. These can provide accurate depth readings with minimal effort.
• Monitoring the water level over time as water is added or removed. This requires initially calibrating the water level to a known depth.
• Performing trigonometric calculations using the angle of a pole inserted into the water and the pole's length. This can provide accurate measurements but requires more setup.
There may be other techniques depending on the tools available. The key elements of an efficient method would generally involve minimal setup effort, accurate measurements with minimal error, and minimal manual labor. Generally, the more direct the measurement technique that directly reads the water depth, the more efficient it will likely be.
Without knowing the specific details of your approach, it is difficult to conclusively determine how efficient your method was. But hopefully this overview provides some context for factors that impact the efficiency of various methods for this type of measurement task. Let me know if you have any other questions!