Trenches, Conduit, Groundwork

We've reached the second phase of the town home landscaping project. If this is your first read and you'd like to see a drawing of the landscape design plan as well as read about work done to date, then check out Post 1: Landscape Design ~ The Town House Plan or for the image friendly version just check out the pic at left taken at the completion of Phase I. Phase II will consist of digging a trench for the electrical conduit to power a water feature, lights, and laptops; the installation of said power train, and then the covering of trench and the groundwork for the patio.

With the plan in place, a quick (long and involved) trip to the local warehouse lumber store yielded a puzzle bag of PVC conduit bits, exterior grade electrical wire, various waterproof (g.f.c.i.) outlets and switches, and a bottle of Grape Fierce Gatorade (delicious btw). To start I put my dad to digging the 24"ish deep trench in which to bury the conduit. While the electrical wire is exterior grade and can be simply buried as is in the dirt, for safety reasons I took a couple extra precautions. Wouldn't want someone getting fried from burying some bulbs. So a 24" depth trench and PVC conduit should prevent a shocking time. For this project, I'm running three feeds. One for the water element switch, one for the lighting switch, and one for a free duplex to use for whatevs when sitting at the table.

After cramming the three feeds into the first lengths of conduit, we began the dance of trying to feed the remaining lengths (around 30') through the network of loops bends and falls. Which was completed with various grunts twists and yanks. The picture seen here shows the conduit snaking its way through the trench, and then up and over the retaining wall. There will be two exterior waterproof switches by the door to our home office. One will operate the water feature, and the other will operate accent lights. We easily could have skipped the added elements, but really this type of work is very easy and takes any garden to the next level.

With the conduit complete and buried, the next step was to prep the ground above the electrical run for the patio. Using long bits of wood and a spirit level to mark the grade, my dad and I began whacking in stakes around the perimeter. Next was attaching 2x4 pressure treated lumber to the stakes for the frame. We got the first half done, and then began grading the earth. We're planning on removing around 2" of soil from the top of the frame down. This is in order to leave enough room for weed block, a layer of finely crushed gravel for the patio to lay on, and then the patio itself. We've decided on a sandstone from Colorado. For detailed instructions on the groundwork and laying of a patio, check out this site.

Landscape Design ~ The Town House Plan

Practicing my version of architecture means I get to geek out on simple things, like designing my garden. Rather than just say what I want, I'll use AutoCAD to create a comprehensive set of plans which will included elevations and sections for the decking / bench / stair element, site-work for the electrical and landscaping trenches, plans and etc. Let's do it. So after some measuring (and a year of living at our house in order to gauge what would be best for the garden), we have a solid plan in place. We had a spare weekend. We had a day laborer to dig our ditch. Hence this blog post, post spare weekend and post initial implementation.

Phase I - plant the screening. We chose bamboo as the privacy screen since the plant does quite well in the Pacific N.W. and isn't overly hedgey looking (my blog - my words). Our old house had bamboo running rampant, but some quick research revealed a way to conquer the power of rhizome. In short: dig a 21" deep trench with a slight funneling towards a narrow bottom. Install a 24" tall bamboo barrier, ours being a 40ml thick polypropylene sheet. Support the barrier with rebar, then refill the trench half-way with the original dirt and tamp down. Fill trench the rest of the way with a delicious compost/dirt 50/50 mix. The end goal of which is too encourage the rhizome to grow up towards the surface due to 1) being contained by a barrier that slopes outwards and guides shoots up 2) create an undesirable growing medium below (tamped down dirt) and a desirable growing medium above (delicious dirt). That way the rhizome can't escape its confines by travelling underneath your defenses.

This image shows me securing the ends of the barrier together using metal plates and bolts. Don't want the rhizomes able to sneak in between the overlap thereby bypassing my defenses! Anyhoo, the 21" deep trench with 24" tall barrier means you'll around 3-4 inches of material above the ground. The reason for this is to force shoots to expose themselves when trying to launch an invasion over your defenses. Pluck ... Ghandi goes the rhizome. Additionally, you fill the upper 3-4 inches with mulch to further lure shoots upwards into a warm and moist sunny surface. We plan to also cover the mulch with black rocks, which will make for a zen-like design. That being bamboo, cedar fence, black rocks, buddhaful.

Tricia donned her garden outfit ("fatigues" and pink gloves, fashion shades, ponytails) and started placing the the bamboo plants. Ours were purchased quite tall so that we don't have to practice patience. Privacy Screen Now Please. We adopted and planted 8 bamboo clusters. Already there's a huge difference at the townhouse. Also, my back feels great. Advice: hire a day laborer for heavy work. Ours had to axe through roots that were the size of trees. If I was doing the grunt work myself, one of two things would have happened after being blocked by the root: 1) broken back 2) the root would have become the designer (my trench would have stopped there)

Next we'll do the groundwork for the electrical run and the patio. The plan includes a water feature in front of the privacy screen, and uplights to highlight the existing laurel and newly planted bamboo. So another trench for the conduit, and then over that will be the patio. In our case we'll be installing a border of pressure treated wood, leveling and tamping down the area within this border, and then laying stone. I'll publish another post at that point.