These questions refer to tides.
1. Why are vertical clearances of bridges along navigable waterways given as heights in feet above mean(average) water height?
2. Why would knowledge of tides be of any importance in a military landing action?
1. Why are vertical clearances of bridges along navigable waterways given as heights in feet above mean(average) water height?
2. Why would knowledge of tides be of any importance in a military landing action?