After missing out on Halo 3's Forge completely I decided to hit Reach's hard and fast. Drainage is a map that I (gamertage = l slicedbread l) co-designed with my friend (gamertag = Yavimayaembrace).

Quick overview:
The original concept for the level was to do something unlike any level made so far and to push our luck. That combined with theory crafting while taking a shower lead to wanting to make a level inspired by sewers. From there my friend and I worked cooperatively in Forge at the same time, each working on a different end of the level independently, and hammered out what is now "Drainage" in approximately 9 hours. No previsualization was done.

The level is completely asymmetrical and is very claustrophobic in nature. The most notable feature, and hopefully not an overbearing novelty, is that 90% of the level is submerged in water anywhere from ankle deep all the way up to your Spartan or Elite's neck. This can really provide some unique ways to stalk, camp and surprise your enemies. This also drastically affects how grenades are used.

Edit 1:
The juicy filter is also turned on. Originally we tested both Green + Orange and Green + Old time, both of which provided a very eerie and murky feel. However, they both made the vision very dark and difficult to manage when combined with the maze like feel of the map and the trouble of navigating through water. However, if someone 3rd parties wanted to try the level out with them enabled, please let us know what you think!
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The following weapons and items are located on the map: Shotgun, Needle Rifle, Concussion Rifle, Rocket Launcher, Energy Sword, Human Sniper Rifle, Human Mounted Turret, DMR, Fragmentation Grenade, Health Pack and overshield.

Currently the spawns are setup for free-for-all and Blue and Green teams (because Red and other colors stand out too much) so keep that in mind. The level was made with Free-for-all, Oddball, Juggernaut and Team Slayer in mind, but the attached custom gametype is just my preferred Team Slayer variant for the map.

About the designers:
Myself and my friend are both Video Game Art and Design majors at the Illinois Institute of Art: Chicago specializing in environment and level design. We want to make as much headway into Reach's Forge as possible and to accomplish that we need as much feedback, both positive and negative, as possible. So please leave all thoughts, notions and ideas you have.

Thank you very much ahead of time, and enjoy yourselves!

Video walkthrough in Forge:
Bungie.net : Halo Reach : File Details

Image previews:
Please also understand that these images do not do the level real justice as it is very difficult to get images of much of the level all at once.

There is plenty in the level that was not mentioned in this description as I don't want to ruin all the fun, so please download this and give it a shot, we'd love to hear anything you have to say!