MAKE SURE TO TRASHBASH YOUR CACHE003.MAP BEFORE APPLYING THE PPF!
From the readme:
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Flood Gulch v. 1.0 by swese44
Well everyone, here you go. Water in Blood Gulch. I believe I am the first to get it on Xbox. Here's a complete description of the mod:
Water!
Rain
Looping rain sound
All new level textures redone
Sentinel laser weapon (gun model is the 1/2 size model of a sentinel)
Gigantic mossy rocks
Darker sky environment
Starry night sky with green clouds and night halo ring
Warthog has a new skin and big mud swamper tires. The gun is now a rocket launcher, oversized barrels shoot 3 rockets simultaneously then pauses. Also has blue lights.
Ghost has new skin
Lilypads on top of the water
Mist particle emitters
Green drips effects on bases and near sentinel laser guns (in the hills)
One of the coolest parts of the mod is the effects. I spent a lot of time setting up the water effects for the vehicles, projectiles and grenades. The visual and audio effects are pretty nice, you'll find out when you drive the warthog, skim the ghost along the ground, shoot rockets and throw grenades in the water, shoot bullets on the ground, etc.
One (really) dissapointing part of this mod was the flood characters. I originally had it so you would have played as the Flood Combat Elite biped, which was awesome since they can jump higher and have cool sound effects and dialogue. You could also shoot off their arms and heads, something that added a twist to gameplay since you couldn't pick up a gun after your right arm got shot off!

If you want to check out how the mod would have been, playing as the Flood Elites, check the box that says "no damage from falling" for the Flood biped in HMT, then copy the meta of the flood elite combat biped to the cyborgMP.
Big thanks to cLuis for HHT4, you are the man.
RunningRiot for trashbash.
Thinkreddie and MrMurder for letting me bug them about the Flood biped
Pokecancer for giving me info on how biped antr works, and for giving me a hand with the rain.
Grunt1287 for converting the rain sound cuz my computer won't cooperate with me.
I might have missed someone, just let me know
As always, give me feedback, good or bad. After spending 60+ hours on this mod, I won't mind spending a few more to try to get it perfect!

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I couldn't get the sentinel laser gun to have a fp model or the correct string entry, so if you wanna fix that for me let me know. MrMurder, you might wanna check that out, weapons are your specialty.