------------------[INSTALLATION INSTRUCTIONS]------------------------
Just take these simple steps and you'll dancing in the rain in no time.
Just take the rain.spr file from the zip and put it in the SIERRA\Half-Life\valve\sprites directory.
VIOLA! instant rain, just add water.  This will be usefull when you download other maps with rain in it.
If you have forgotten put the .bsp file in the SIERRA\Half-Life\cstrike\maps directory.