Step 2: Build the water containment system.

Next line the depression with a poly liner. I purchased mine from the local big-box hardware store in the paint department. I wrapped the plastic up and attached it to the lower edge of the wooden box with galvanized roofing nails. In the lowest corner, I did not fully attach the plastic at the top, so that water could run over when full.

Once your liner is installed, prepare a section of corrugated drainage pipe. This pipe is 4 inches in diameter and has small holes throughout the pipe to all water to escape. Place a cap on each end of the pipe. In one end, drill a hole and insert a PVC pipe which will be used to fill with water. No need to bother gluing everything together; the purpose is to let the water seep into the rocks anyway.

Next lay the prepared pipe into the depression. I recommend you size the pipe to run the full length of your bed, but it is not critical to loop the pipe as I have done here. The pipe simply speeds up distribution of the water throughout.

Next fill the depression with rocks. Ideally you will fill to the top of the corrugated pipe

<p>Hello comment section, I have an emergency. I am using this design for my eagle project which is in 2 weeks but I didn't realize the instructions do not tell you how to build the actual box. If someone could please tell me how to build the box above with the same wood given in the instructions, that would be amazing. </p>
What type of soil do you use? Is it just topsoil or more of a potting soil mix?
What was your overall cost?
Nice design. Two suggestions. First, you want to cap the tube going into the container when not in use to avoid the odd rodent exploration possibility. I did this with my earthtainer clone. Second, I used a cork with piece of light plastic rod as a floating dipstick. The rod went thru a small hole drilled into the cap. I had one mark for full and another for empty and that way I could tell the level of water by looking at the height of the dipstick
<p>Clever idea. Do you have a picture of this?</p>
why is it a bad idea to use pressure treated wood for the bed?
Because of the chemicals in it. They can get into soil and into plants.
I wanted to ask specifics on this as the info I had found said the only chemical of concern with vegetables was arsenic which hasn't been in pressure treated wood since 2004. Are there other chemicals the plants will take up that my info maybe didn't cover? If so what am looking for? I ask because I am poor and my deconstructed deck is slated to make some nice raised beds for me before next season. Thanks.
<p>Using pressure treated wood is up to you, as you say, they haven't used lethal (that we know of) chemicals for treatment for some time. A friend worked at a saw mill, one day they were discussing this issue and calculated how much wood you would have to consume to get near problem levels. The amount of treated wood was in the measure of many cubic yards. </p><p>Treated timber isn't an issue if you are doing a wicking bed anyway, because you often use a plastic liner inside the bed which will keep soil away from touching anything leaching out of the wood. Check out some of the other wicking beds here on instructables to see what I mean regarding using a liner. Hope that helps. If it was me, I would be making good use of that decking timber and building a lined type bed.</p>
I have to agree about not using pressure treated wood. Perhaps Arsenic is the most toxic and worrisome, but if you are using this to grow food you will eat, then you are taking the risk that in 10 years research will demonstrate a link between illness and whatever is presently being used to treat wood. You can find untreated wood inexpensively at may places. Construction sites will often have dumpsters full of culls. My local big box store has nearly free pieces that are warped or odd-sized. We also have a place called Construction Junction that has recycled lumber. Finally Craig's List often lists free wood that you can take for the hauling. <br>

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