Evaporating water reduces the temperature, so more fuel can be added, increasing power.

Also, it is requiring that the agencies treat the water to reduce corrosion of pipes.

Lower water temperature reduces water's effectiveness for cooking or preparing hot drinks.

The extra water will reduce the effective capacity of the system and may flush solids out.

The water reduces friction so sliders travel down the slide very quickly.

The water might reduce their swelling, allow more blood past the bonds-perhaps even loosen the bonds themselves.

In addition water on the runway also reduced braking capacity.

Removing water from the coal bed reduces pressure and releases methane.

As noted above, water and various other fluids can reduce stickage.

When the water reaches a vigorous boil, cover and reduce the heat to medium-low.