R wateralpha

Name: r_wateralpha
Default value: "1"
Cvar flags: None
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~copied from FuhQuake manual~
r_wateralpha (0..1) default: 1
This variable determines the level of opacity for liquids, which requires
the use of maps that were VISed with transparent water. When using maps that
have not been VISed in such a way, you have to use "r_novis 1". If r_novis is
set to "1" or when using a map VISed with transparent water and using setting
"r_wateralpha" to a value lower than "1", the player will be able to see objects
and walls through liquids if the server allows that. This is a very nice feature
to have in the game, for more information refer to the r_novis command. You
can use any value between "0" and "1" for "r_wateralpha", here are some
Examples:
0.00 = Transparent.
0.25 = Low opacity.
0.50 = Medium opacity.
0.75 = High opacity.
1.00 = Solid.