Every summer starts the same way. In the spring, we plan, purchase, and plant our new seed and seedlings into pots, planters, and rich, brown raised beds. Then we water. At first watering is fun, especially when we're anticipating the first new shoots. After a couple weeks, reality sets in. Time is short, there's too much to do, and the plants still need to be watered. Weeds—plants out of place—are a never-ending problem and all that careful watering produced a bumper crop. The last straw is always the sticker shock that accompanies the first water bill of the summer.
At this point, we realize the only practical way to control our water consumption, reduce weeding, and provide ample water for our veggies and flowers without wasting a drop is to put in some kind of irrigation system. We dutifully head to the home improvement store and survey our options. There are hundreds of emitters, spikes, spray heads, tubing, and timers. Where in the world do you start?
There are a plethora o' advantages in having a drip irrigation system. First, it saves time ... lots of it. With a good quality timer, the system takes care of watering your plants, so regardless of how pressed you are for time, your plants won't have to pay the penalty. A few days of waterless stress during a warm spell and all those plants will croak overnight and your investment of time and money is lost. And you won't have to kick yourself for running out to do errands only to come home five hours later to a small flood plain. Finally, by putting water only where you want it reduces weeding significantly.
How big is your garden? What are you watering? Will you need to designate zones that require different amounts of water? Are you also doing containers or hanging baskets? Each pot or plant may have slightly different requirements.
The best way to start is by creating a plan. Create a rough drawing that accounts for the plants you want to water. Color code them with watering requirements ... don't worry about getting it absolutely right at this point ... you can swap out emitters if the 1/2 gallon per hour emitter doesn't do the trick and easily replace it with a 1- or 2-gallon emitter. Focus on the plan but don't get too hung up on details yet.
Regardless of the method you use to create your plan, make corrections on the drawing as they occur to you. You save yourself a lot of wasted time and parts. It's always better on paper than once you have the lines laid out and cut.
When you do this for the first time, it's often a good idea to start small with just the plants on the deck or a small herb bed. Once you get the hang of it, scaling it up to accommodate anything else you want to water is relatively simple.
Once you know what you how your system will be laid out, you can start making your shopping list.
The tools you'll need include a hammer, a good pair of shears, and a special hole punch for irrigation systems that can be found in the area of the home improvement store that has all the other irrigation supplies.
Purchase about 15% more of the tubing, emitters, connectors, and plugs than you think you'll need, but save the receipt. If you tend to be very meticulous, you can plan exactly what parts you'll need, but you will still probably need a few extra parts to finish the job. Seems like it always takes a few more than you think and it's so much easier to have them than make yet another trip to get them. When the system is completely finished and everything works, keep a couple spares and return the rest.
The faucet connects, in order, to the timer, the backflow preventer, pressure regulator (if needed), swivel adapter, and 1/2" main line.
As mentioned before, one good timer is worth six inexpensive ones. Read the manual first, then store it where you can find it again.
Set the timer to water as needed. Plan on resetting it according to the conditions as they change throughout the summer. As the days get longer and warmer, you'll probably need to increase watering times and durations. (Water early in the morning to maximize water uptake and minimize evaporation. And don't forget to mulch.)
When late fall rolls around, remove the timer and store it indoors over the winter to prevent damage.