Step 1: Water Flow
The point here is to show the behavior of the water and the wheel. We are aiming the water jets to hit just under tangent to the edge of the wheel so we get maximum effect. Note the whit painted wheel section shows the spin.
A note on performance... You can see the short pipe on the far side is impacting the wheel well, but on the longer jet on the near side needs to be tweaked to maximize impact.