As the runway will always be at a higher elevation than the water I am initially flying- which makes for an interesting water landing.
When moving the ac in the map, set 'Altitude' to 0 before clicking OK. Or use slew mode and once over the water use the Z key to 'decend'.
If you're intent on having a Beaver amphibian, I will vouch for the excellence of the
Aerosoft Beaver X (payware).
Dave
At that time [1909] the chief engineer was almost always the chief test pilot as well. That had the fortunate result of eliminating poor engineering early in aviation.