10.11.3. Tidal Errors

Try these first

1. 1.

   What are tidal errors?

   Hint

   Think about how tides change water levels.

2. 2.

   Why is a tide gauge important?

   Hint

   Consider which device reports tide information.

3. 3.

   What causes tidal errors in hydrographic surveying?

   • Incorrect tide level application
   • Using historical data
   • Correctly measuring water depth

   Hint

   Think about what actions lead to depth inaccuracy.

4. 4.

   True or False: Tidal errors can be completely avoided.

   • True
   • False

   Hint

   Consider the variations in tide levels.

5. 5.

   If a hydrographic survey reports a depth of 15 meters but fails to adjust for a tide that rises 3 meters, what is the actual depth?

   Hint

   Think about how the tide changes the perceived depth.

6. 6.

   A survey team used a datum that is 2 meters off. If they measured a depth of 10 meters, what was the actual depth in relation to the correct datum?

   Hint

   Consider both scenarios for possible depth adjustments.