haha, never built a damn. Billabongs do not.
Anyways, given the specs, the engineer is correct.
And Muzby the Panama Cannel does run the other way. North West to South East, gravity counts there.
In my ditch would be tidal power plants.
After I build my ditch, I want to build nuclear power plants, supplied by uranium from NT and wind and solar plants all the way down.
Run a power lines to India, and Asia who can in turn run the to power to Europe.
Big job, but can be done.
Would make this country the wealthiest on earth.
Terraforming, must be mastered, or we humans all die on this rock.