One of the greater enemies of a river is the uncontrolled spills. The contamination produced by a varia spill based on the type and of the amount of the same one.

The photography shows a spill that we can find before the Bridge of San Roman in Llovio.

The mugiles usually roam by the zones where spills of this type exist, all the opposite who trouts or salmons that prefer well oxygenated clean waters and. The flora near this type of spills tends to disappear.

A river with spills causes that little by little it dies, a solution to the spills is the creation of water purifiers (to see water purifier), that they are able to canalize the different spills, although the best solution would be than any bad action of the man was avoided.