This past week, I’ve been working on gutting my landscape. The reason for this is because the first order of business is to install a site drainage system. The reason this is first on the list is because I have to excavate in order to install my upgraded electrical power line from the power head on the street. I then have to cover it up and pour concrete because that is where I am going to place the temporary storage box for all the household crap I have to move in order to vacate my master bedroom to build out the addition. A real Chinese puzzle. But I digress. So, if I’m going to excavate and break up concrete and hardscape, I better do this once. That means that I have to plan for ALL underground utilities, being it 12V lighting, drainage, or irrigation.
When I started looking into irrigation, I wanted to make sure that I was making a very conservative plan as water, especially for irrigation, is a scarce resource here in Southern California. My studies revealed that the two approaches which made most sense were drip irrigation with a xeriscape, and use of grey water from the laundry. First the xeriscape.
The idea of a xeriscape is not new. There are several high quality example gardens in our area, and we have visited them on more than one occasion. The idea is that you provide some drip irrigation to start the plants out, and as they mature, they require less and less water. Plus, drip irrigation is very efficient as it waters the roots directly, as opposed to spraying water all over the place and having the excess run down the storm drain. Let’s face it: if you live in Southern California, or any other place which is subject to drought, then you should be ashamed of yourself if you have spray irrigation. Especially if you have a lawn. If you like the expanse of green, then get artificial turf. The modern and smart way to landscape is with drip irrigation and water conservative plants.
The best reference I was able to come up with was a website called irrigationtutorials.com. The person who writes this is a professional landscape architect, and his information is very detailed and practical. Regardless of what irrigation system you choose, you would do well to visit this site and to peruse, if not read thoroughly, what he has to say. I learned a TON about what to do, but more importantly, what NOT to do. Pay particular attention to the section on backflow prevention. This is serious stuff, especially if you don’t want your drinking water contaminated with whatever happens to be on or near your drippers. After all, animals, both domestic and wild, have to do their business somewhere!
The other thing I discovered, and I am STOKED about this, is the use of grey water for irrigation. Grey water is waste water from your house that is not sewage, e.g., not from your toilets. So, anything from your sinks, showers, dishwasher, or laundry, is considered grey water. Now, if you’re ultra conservative, you could set up a system that uses ALL of your grey water for irrigation purposes. But some of this requires permits and professional design. However, there is a low-cost DIY approach: using the effluent of your washing machine. Your washing machine uses a lot of water per load. If you have a top loader, then it’s 40 gallons per load (20 gal wash and 20 gal rinse). Even the high-efficiency front-loaders are 20 gallons per load. So, why not put all of that water to use in irrigating your property? The answer is that it’s pretty simple and definitely within the realm of a DIY project. First, there’s typically no permit required. Second, it’s relatively cheap. All you need is a 3-way valve, a vacuum breaker, some PVC pipe and fittings, some materials to make a bunch of mini-dry wells (perforated pipe, gravel, and circular pavers), and some inexpensive valves to regulate the flow such that you have an even distribution of water. There are some regulations that you have to be aware of, such as property line setbacks and having sufficient surface area to distribute water so that it doesn’t pool or overflow, but these requirements are spelled out very succinctly in a number of on-line articles. The best one is a manual that was produced by the city of San Francisco, CA (San Francisco Grey Water Design Manual) that is a very comprehensive guide. It includes detailed instructions for installation of a DIY laundry effluent grey water system. In my jurisdiction, Chula Vista, CA, the city took (plagiarized) elements of this manual for local guidance. So, if you care about water conservation and are in an area where drought is a concern, this something very simple and do-able for the average DIY.
The San Diego County Water Authority published a good guidebook on how to design a “water-smart” landscape (here). Additionally, the City of Chula Vista posted some professionally designed xeriscapes. Here is the link, but for some reason, it’s not working at the moment I’m writing this, so I’ve posted one of the plans here: wildlifefriendly-irrigationplanwildlifefriendly-planwildlifefriendly-plantimageswildlifefriendly-concept,
So, this was an expansion to the original project, but for several reasons, I think this is the way to go. I’ll have more details about my site plan in future posts.