Now let’s work with the Material properties, to alter our river’s appearance.

In the Scene Tree, expand River_0 to show Area1(full).

In the Properties Tree, expand Material and then Fresnel Water.

In the Property Page, set Generate Map to Every Frame.

Now, select the Colors/Depth property.

Choose a greenish-blue shade for the Surface Color value; Deep Color can be left black if you wish.

Use a Deep At setting of 10.

Render the scene once again to check the result.

Select the Flow Parameters property.

Set Flow Speed to 0.1.

Set Perturbations: Amplitude to 0.25.

Set Average Waves Spacing: Across to 1.

Set Average Waves Spacing: Along to 1.

Set to Wave Period (frames) to 20.

In the Speed Profile Property Page we see a curve defined by three points. The low points at each end of the curve indicate a slow-moving river current, while the high middle point represents a faster current (and more visible ripples) in the middle of the river.

Click and drag on the points.

Re-render the scene a few times to see the effect of different settings for Speed Profile.