After rills begin forming, they are subjected to variety of other erosional forces which may increase their size and output volume.

Output volume rose by 1.9% in 2010 compared to 2009, productivity increased by 1.6%, and direct subsidies fell by 12%.

Calculating methods differ in the use of either output volume or input volume for measuring the volume of activity.

The protocol supports metadata packets that determine the final output volume on the receiving end.

To prevent digital signal overflow and its audible result, the digital output volume must be kept low enough so that bit 14 will never be used.