Artefacts in 3D Render When Adding Springs

[craftycurate]

Colour artefacts appear in 3D render when addings springs to Muddy Canyon terrain.See circled areas. The size of artefacts increases with the Power of the spring.

Artefacts appear where spring flows enter the river basin.

Thanks
Richard

gts file attached.

[cajomi]

The springs are in developement. To be true, since the last build, I am only working on them.