I have made a fake a lake just like this and it works perfectly. It is great to see that water is flowing to the engine. One warning is make sure you turn off the engine before you turn off the water supply. If you turn off the water first it will create pressure in the system.
2008 Outback V - Sold but never forgotten.
“Do not wait; the time will never be “just right.” Start where you stand, and work with whatever tools you may have at your command, and better tools will be found as you go along." -Napoleon Hill