Sometimes all that can be achieved is slow shutter, due to available light.
From memory, this image was taken using a shutter speed of 30 seconds, ISO 100, and a relatively high F stop value to get good depth of field (though of note, wider angles make really high f stop values less critical, so experiment).
A faster shutter would mean I would need to adjust something else, likely ISO, but I would need to go quite high to get near a speed that would capture the motion (as opposed to blur it).
That would of course make the image grainy (also called noise).
So you work with what you have and try for the best result possible under the conditions available to you.
