I'll bet the manufacturer's plans do indicate the exact height and what they're based upon. The vagueness you're referring is just what's publicly available.
Serious question- In your experience, when plans are initially filed, if a property owner submitted what you deemed did not adequately provide measurements, wouldn't they be rejected upon submission and not go through the filing process?
All comes down to the relationship you have with them. So in this application, before the construction plans were submitted, 315 ft is ok. When you apply for the waiver you likely just know how high you are going to go. But as soon as you submit the actual site plans, you need this to be updated to better reflect.
As for as the manufacturers plans, it's still way to vague IMO. Does Intamin consider the lowest point of the attraction the 0 height? So if the bottom of the lowest point of the ride is the 0 point, the drop is VERY big, but the height above the land it's over isn't as high.
BTW to add in: The reason you want a clearer application on height waivers, as a planner you can end up with a large number of inquires into a better description to know what it would look like.
An example: When I worked for a township, and we were developing a town center, and we were going to have a clock tower in it. We wanted to be vague at first of having the height of the structure to be 100 feet. In our first public forum on the area, people were up in arms of where it was going. They didn't want it up on the hill top because it would be 'an eye sore for the entire township'. Of course we wanted it there. So we got sneaky in the next one, and it was the
exact same without the exact same language. We wrote that 'The town center was to be placed at the highest elevation, with a clock tower to rise 50 feet over the maximum town core hight allowance". Reference, that height limit was 50 feet on the tallest buildings. So now, residents near there knew that the height limit was 50 feet, and only considered that the clock was 50 feet above that.