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==Introduction== | ==Introduction== | ||
===History=== | |||
Greywater is the water from your sink, shower and washing machine(everything but the toilet) that goes down your drain to the treatment plant. This water can be filtered and then used to water plants in your own backyard (see the general Greywater page for more info). The Campus Center for Appropriate Technology (CCAT) has had plans to build a new greywater treatment marsh since the CCAT house (yes, the actual house) was moved a few years ago, changing the layout of the yard. As our project for Engineering 305 class ("Appropriate Technology"), we decided that making this plan a reality would be an appropriate use of our time and energy that many people could continue to learn from for years. | |||
===Description=== | ===Description=== | ||
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* Surge Tank | * Surge Tank | ||
A Surge tank was included in the design of this system to provide protection from overflow. The tank itself serves as a place for the untreated water to go if a large amount of water flows out of the house all at once. Surge capacity. how much? gallon? | |||
* Gravel Marsh | * Gravel Marsh | ||
The actual treatment area is 4 ft wide by 14 ft long by 3 ft deep. Because this system was built on a hill, we had to dig even deeper than 3 ft to make up for the slope. | The actual treatment area is 4 ft wide by 14 ft long by 3 ft deep. Because this system was built on a hill, we had to dig even deeper than 3 ft to make up for the slope. We decided that 2 lower baffles and 3 upper baffles would suit our treatment needs. The baffles are barriers that direct water flow and maximize surface area therefore maximizing the amount of treatment in the given area. | ||
==Construction== | ==Construction== | ||
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* Diverting Greywater | * Diverting Greywater | ||
We started by digging a hole 5' deep by the greywater outlet for the sedimentation basin to sit in. The 3' tall, 50 gallon basin rests in the bottom. | |||
* From the House to the Marsh | * From the House to the Marsh | ||
After this, we dug the trench from the outlet to the marsh location. The trench was 3' deep and 27' feet long. The trench was started during the previous semester. Don't underestimate how long it takes to dig by hand. | |||
* Extra Plumbing | * Extra Plumbing | ||
We layed 2" piping inside a 4" sleeve in the trench. The sleeve was required by HSU Plant Operations because a driveway needed to be built over it. | |||
* The Big Hole | * The Big Hole | ||
We marked the shape of the marsh and the hole for the surge tank (located between the trench and the marsh itself), and started digging. To accomidate the calculated flow from the house, we needed a marsh 10' long, 4' wide and 3' deep. (INSERT DETAILS ABOUT FLOW) We decided that based on the slope of the adjacent hill, we would need to dig a hole 5' deep in order to have a marsh 3' deep. | |||
* | * Baffles? Baffles! | ||
We cut out baffles made of plywood and hardwood to about 4' wide, 2.5' high and lined the 3 top baffles with pond liner in hopes of delaying decay. We installed the bottom two by wedging them in the dirt. | |||
* | * Pond Liner | ||
At our local landscaping store, we purchased a 23' x 10' cut of pondliner. We calculated this size by figuring the area of the marsh walls plus the area of the two bottom baffles, and an extra foot on all sides (it might be a good idea to calculate an extra 2' on all sides as the liner shifts when you start filling it with gravel). It was helpful to tack the edge of the liner into the ground when filling it. After the liner was in, the 3 top baffles were installed; one a foot from the marsh inlet, one a foot from the marsh outlet, and one smack in the middle of the two bottom baffles. the bottom of the top baffles were placed approximately 6" from the marsh floor. | |||
* Gravel | * Gravel | ||
* Planting | * Planting | ||
Revision as of 00:08, 21 May 2008
Introduction
History
Greywater is the water from your sink, shower and washing machine(everything but the toilet) that goes down your drain to the treatment plant. This water can be filtered and then used to water plants in your own backyard (see the general Greywater page for more info). The Campus Center for Appropriate Technology (CCAT) has had plans to build a new greywater treatment marsh since the CCAT house (yes, the actual house) was moved a few years ago, changing the layout of the yard. As our project for Engineering 305 class ("Appropriate Technology"), we decided that making this plan a reality would be an appropriate use of our time and energy that many people could continue to learn from for years.
Description
- Greywater Outlet
During renovation of the CCAT house, plumbing was designed to divert greywater from blackwater; making it easier for the future greywater project. This outlet is located 3 ft beneath the ground.
- Sedimentation Basin
The basin is composed of a 50 gallon drum which was aquired through the Campus Recycling Program. Inside it (niki/drawing?). It is located directly next to the outlet, the top of the 3 ft barrel is 2 ft below ground level.
- Pipe to Marsh
A 27 ft long, xx in wide pipe was needed to pipe the water from the Sedimentation Basin to the Surge Tank. The reason why these two components are so far apart is because a driveway needed to be built between the outlet and the marsh site.
- Surge Tank
A Surge tank was included in the design of this system to provide protection from overflow. The tank itself serves as a place for the untreated water to go if a large amount of water flows out of the house all at once. Surge capacity. how much? gallon?
- Gravel Marsh
The actual treatment area is 4 ft wide by 14 ft long by 3 ft deep. Because this system was built on a hill, we had to dig even deeper than 3 ft to make up for the slope. We decided that 2 lower baffles and 3 upper baffles would suit our treatment needs. The baffles are barriers that direct water flow and maximize surface area therefore maximizing the amount of treatment in the given area.
Construction
Detail
- Diverting Greywater
We started by digging a hole 5' deep by the greywater outlet for the sedimentation basin to sit in. The 3' tall, 50 gallon basin rests in the bottom.
- From the House to the Marsh
After this, we dug the trench from the outlet to the marsh location. The trench was 3' deep and 27' feet long. The trench was started during the previous semester. Don't underestimate how long it takes to dig by hand.
- Extra Plumbing
We layed 2" piping inside a 4" sleeve in the trench. The sleeve was required by HSU Plant Operations because a driveway needed to be built over it.
- The Big Hole
We marked the shape of the marsh and the hole for the surge tank (located between the trench and the marsh itself), and started digging. To accomidate the calculated flow from the house, we needed a marsh 10' long, 4' wide and 3' deep. (INSERT DETAILS ABOUT FLOW) We decided that based on the slope of the adjacent hill, we would need to dig a hole 5' deep in order to have a marsh 3' deep.
- Baffles? Baffles!
We cut out baffles made of plywood and hardwood to about 4' wide, 2.5' high and lined the 3 top baffles with pond liner in hopes of delaying decay. We installed the bottom two by wedging them in the dirt.
- Pond Liner
At our local landscaping store, we purchased a 23' x 10' cut of pondliner. We calculated this size by figuring the area of the marsh walls plus the area of the two bottom baffles, and an extra foot on all sides (it might be a good idea to calculate an extra 2' on all sides as the liner shifts when you start filling it with gravel). It was helpful to tack the edge of the liner into the ground when filling it. After the liner was in, the 3 top baffles were installed; one a foot from the marsh inlet, one a foot from the marsh outlet, and one smack in the middle of the two bottom baffles. the bottom of the top baffles were placed approximately 6" from the marsh floor.
- Gravel
- Planting
- Sedimentation Basin installation
- Surge Tank installation
- End use
Plans
Photos
Maintenance and Testing
Future Projects
Vision
Special Thanks
Special thanks goes out to all of the lovely volunteers we had at CCAT every Friday, the CCAT Co-D's for being so patient and supportive, everyone who helped with the design and construction of this here marsh, Nathan Chase, the Engineering 305 class, Miller Farms, HSU Plant Operations, thanks to bullrushes, wheelbarrows, shovels, rice, chocolate and water. This project simply couldn't have been possible without this wonderful, supportive community.