Calculating volume of an arch dam

[Idol24]

Homework Statement

How would I calculate the volume of an arch damm?

Homework Equations

The Attempt at a Solution

 

[Dell]

you need to give more information, but in the general case, if you have the equation of the arc curve, and the height(supposing it isnt an angled/curved wall(height)) find the area of the top and multiply by the height