wierd water texture purple and black "stripes" and squares

[LASER-----X]

i was playing gmod and the water was perfect, but now, when i look at the water from a distance it has purple and black "stripes" and squares, but when i go closer to it, the water is normal. I have CSS, hl2/ep1/ep2, tf2, and portal.
System info:
Microsoft Windows XP Professional (5.1, build 2600)
Processor: AMD Athlon(tm) 64 Processor 3400+, MMX, 3DNow, ~2.2GHz
Memory: 958MB RAM

I have pictures but i am unable to show them.

[chesseylol]

Its probably DoD.

[Kirad]

What map are you viewing the water on?

[LASER-----X]

ch_saturnvalley_b3.bsp
and
ch_tazmilly_b1.bsp
there's alot more maps where i have this problem, like when i play a deathrun gamemode online.

chesseylol: what is DoD?

[CoolCorky]

Day of Defeat: Source.

And I'm guessing none of those maps have cubemaps. Open the console, and type in the following commands:

mat_specular 0
buildcubemaps
mat_specular 1

[LASER-----X]

thanks it worked

[longbyte1]

There's also this fix of that on garrysmod.org. I can't find it anymore.