Drip irrigation systems play an important role in desert-friendly xeriscapes. When properly designed, installed and managed, drip irrigation efficiently maintains the optimal range of moisture in the soil. It applies water in precise quantities, to the right depth and on a set schedule. Installation and modifications are easy to do and relatively inexpensive.
Drip irrigation is the recommended method of delivering water to shrubs, trees and all other plants that are not considered turf grasses. When using drip irrigation there are a few things to keep in mind to make sure you are watering as efficiently as possible.
Below are some “Rules of Thumb.”
Grouping plants of similar water needs on the same drip line makes establishing and maintaining plants much easier. This is called hydrozoning.
Drip emitters should be placed where the backfill meets the root ball. Larger plants need several higher than normal flow rate emitters to water the transplanted roots plus the backfill. Water needs to penetrate the soil deep enough so that the entire root ball plus the soil below the roots are wet.
To grow a healthy tree, add ground covers, ornamental grasses and/or shrubs. They act as a supportive network around a tree so the tree roots can grow from one irrigated spot to another, sharing water with all the plants under and beyond its canopy.
Shrub and groundcovers under a healthy tree.
The length of time it takes for plants to become well- established varies greatly and depends on the species of the plant and the site conditions. The best adapted, fastest rooting plants may become well-established in one or two growing seasons. Some plants — such as those in extremely hot or exposed windy locations — may take three to five years of weekly watering during the summer before the quantity of water they need can be reduced.
For the first month or two after planting, keep the drip lines running once a week for 45 minutes at a time. If there's no rain and the temperature push 100 degrees for many days in a row, you may need to water every 4 to 5 days. After a few months, you can follow the watering recommendations offered in the Water by the Seasons chart. For plants to get properly established, it is important that water penetrates the soil at least 6 inches deeper than the roots of the new plants.
Once your trees and other plants are established, the best way to efficiently water your trees and plants and maintain a healthy landscape is to follow the Water by the Seasons recommendations shown below.
Current Drought conditions mean even more water will need to be used for your high-water use lawn to remain healthy. If you have been thinking about transforming your lawn into a desert friendly xeriscape there is no better time to do it than right now! These types of landscapes are more resilient to climate variability and can provide for up to 30% in water savings or more. Rebates of $1.00 per square foot are available for our residential customers. Certain restrictions apply, and your plans must be approved in advance by Water Authority staff so don’t start removing your lawn until you have submitted an application and contacted the inspector. Learn about our Xeriscape rebate here and get the link to the application portal.
Our expert staff can provide advice and free resources on how to start your beautiful xeriscape transformation. If your application is approved an inspection will be scheduled to verify that your grass type is considered high water use and has sprinkler irrigation. The grass must be currently cared for at the time of the inspection to qualify for the rebate. The inspection is a great opportunity to ask questions and get opinions from our xeriscape expert on various aspects of transformation projects such as plant selection, irrigation conversion and tips for saving money by doing it yourself or hiring a professional landscaper.
To remove your lawn we recommend using a sod cutter because it’s a fast and effective, chemical-free method to remove your lawn. Many local equipment rental companies rent sod cutters. Approved participants of the xeriscape conversion rebate program may receive 25% up to $100 in rebate off the cost of renting equipment like a sodcutter or skidsteer for removing grass. Before removing the lawn, make sure the soil is not too wet or too dry. Set the cutting blade depth at the shallowest setting necessary on the sod cutter to help retain as much valuable soil on site as possible. The removed sod should be recycled at one of our local composting facilities. One advantage of using a sod cutter is that it is chemical-free, fast, and you can continue with the next step of your project on that same day.
Please note: This method is not recommended for lawns that have mature trees. Sod cutters can damage shallow, fine-hair feeder roots that are critical for water and air uptake. Sod cutters are also not recommended for lawns with Bermuda grass due to the nature of its rooting system. For these cases you might want to consider herbicides. Take advantage of our free ask an expert email service if you have questions about what type of lawn you have or any other questions about xeriscape transformations.
Additionally, xeriscape rebate participants get 25% off the cost of installing bulk organic mulch up to $100. Not only is organic mulch such as shredded wood chips, aesthetically appealing, it provides numerous other benefits. Mulch increases moisture retention in the soil, encourages healthy root establishment, and greatly reduces weeds. A 3”-4” thick layer of organic mulch and drip irrigation are two of the best tools we have for keeping our landscapes healthy and resilient in times of drought.
Check out the Desert Friendly Xeriscape Rebate page to learn more about the qualifications, requirements and process to apply for this generous rebate. You may also contact our xeriscape specialist Amos Arber, at aarber@abcwua.org or 505-208-2015
Author: Amos Arber, Xeriscape Incentive Inspector, and Certified Arborist for the Water Conservation Department of the Water Authority. Have a question about the article? AskAnExpert@abcwua.org
Spring is here, and it is a dry one. Remember that we are under a drought watch, which is no reason to panic, BUT it does mean we need to be much more careful with our water and aware of how efficiently we are using it in our yards.
This April, there are three easy activities you can do to help make sure your system is working more efficiently.
1. Double check your irrigation settings. Your plants are actively growing now. They need an extra drink of water to stay healthy, but it is important that we are not giving them too much. Your plants will do better with a deep watering done less frequently. Print out our Seasonal Watering Chart, which shows how often we recommend watering each type of plant. Water your lawn one to two times per week, your trees two times per month and your shrubs two to three times per month.
Check with a screwdriver to make sure the water is reaching the roots but not going so deep that the roots can’t reach it. The proper depth is on the right side of our chart above.
2. Make sure that your trees and shrubs are watered around their drip line so they can efficiently use the water they are getting. This is where woody plants (trees and shrubs) are best able to take up water from the soil. If your emitters are at the trunk or base of your shrubs, your plants are not able to use all of the water you are giving them. You need to move the emitters out to the drip line, and you may need to add additional emitters. For example, if there are only two emitters serving a mature tree that needs over 400 gallons of water in April, it will be nearly impossible for that tree to get enough water to remain healthy without adding more emitters.
3. Because of the “stay at home” health order, many of us have been focusing on improving our yards. This is the perfect time to upgrade your irrigation system so you can water more efficiently. You may only need to replace the nozzles on your sprinklers, or you may be looking at a complete yard transformation. By making changes sooner rather than later, you will benefit in three ways: You will save money sooner, probably have a better chance of getting into a contractor’s schedule if you need help and put less stress on your plants if the work is done in the cool spring weather rather than during the summer.
It’s also the perfect time to reach out to us for help. Send us an email at AskAnExpert@abcwua.org to ask landscape questions or to arrange an appointment for a free consultation.
Author: Richard Perce, Irrigation Efficiency Specialist with the Water Resources Division for the Water Authority. Have a question about the article? AskAnExpert@abcwua.org
As I write this, a cold thin snow cover still hides the ground, but it won’t last long. If we’re lucky, the snow will slowly melt and seep into the soil; if we aren’t lucky, it will sublimate right into the atmosphere – straight from solid to gas. Alas, the roots of our trees lie in the dry desert soil, waiting for water.
It’s always that way, here in the arid Southwest. Our soil, lacking in moisture, also lacks living and dead organic matter. The water that falls on our land either falls infrequently, too little or too much all at once. Still, the plants and trees persist. It is up to us, the human caretakers of these places and trees, to do whatever we reasonably can to provide them with what they need to survive.
Sounds kinda doom-and-gloom, you say? It does! This year promises to be very dry and likely very hot. We all need to do our part to conserve water, and yet we want to keep those established trees healthy and help recently planted trees get established. So, what to do?
It turns out that the two best things we can do are relatively simple. We can reasonably and regularly irrigate the trees (more details below) and apply a layer of coarse organic material as a mulch over the root zone of our trees.
Since every tree in every yard is different, how often you’ll need to water your trees largely depends on how quickly water moves through the soil. In sandy and gravelly areas (Westside and Foothills), the water passes through the soil quickly, moving past the tree roots. These types of soil need watering more often but with less water each time.
Here is how to do it: Water long enough that after a day, when the water has soaked in, the soil has been moistened about 16-24 inches deep. Poke a thin piece of metal (a long screwdriver or something similar will work) into the ground and see how deep you can push it in. That will tell you approximately how deep the water penetrated the soil.
Do this in a broad area, focusing not on the trunk but on the part of the ground under the outer half of the canopy and maybe a bit beyond the drip line (edge of the canopy). Feel the soil with your fingers to determine when to water again. You don’t want to let the soil completely dry out between irrigations! Also, pay attention to the leaves, noticing if they are full and flush or droopy and tired.
The best way to water soil that has more clay in it is to irrigate less often but with more water. This kind of soil holds more water, but that water moves slowly. Be careful not to overwater, especially near the trunk. Too much water in the soil interferes with root function and can more easily lead to root rot and decay issues. Concentrate the water in the outer half, and also in a bit of the canopy shadow, all the way around the tree.
Wood chips, which can be obtained from a tree service or a local vendor, are the ideal mulch for trees. No matter what soil type and irrigation pattern you have, putting approximately three inches of wood chip mulch directly on the soil does wonders for your trees. As with any mulch, wood chips cover and cool the soil and reduce evaporation. As the chips decay, they foster the development of a forest-like soil ecosystem, which is just what tree roots really benefit from. Think of the ground surface in a forest — bits and pieces of old trees, slowly decaying at the surface. Add a new layer of mulch every couple of years, and watch your trees thrive!
Other mulches, like pine bark chips or pecan shells, are not quite as good as wood chips. Rock mulch is not a good choice. It absorbs sunlight and releases that energy as heat that rises through the tree’s canopy and strips even more precious moisture from stressed leaves.
Did you know that the Water Utility Authority will help cover the cost of some of this work? Through the Treebate program, they will offset a portion of the cost of certain purchases — such as new trees — and activities such as pruning and other maintenance work, soil improvements through compost and mulch and even some irrigation costs. Check out tree recommendations and all the program details here.
Irrigation controllers can be intimidating, particularly because they only get adjusted seasonally and it is easy to forget how to program the timer correctly.
In this article, we are going to explain some terms and point out some functions which are universal, regardless of the type of controller you have. We are also going to provide some pointers on what will help you keep track of it all, as well as provide you with links to a few programming videos that discuss the most common irrigation controllers in Albuquerque. So let’s dig in!
On nearly every controller you will find the following functions: program, time/date, start time, run time, days to water, autorun, and off. You will almost always have some +/- keys and some right and left arrow keys. These +/- and arrow keys are used to set your times and days. Other functions may be included on various timers as well.
Illustrated are two of the most common controllers installed in Albuquerque, the Hunter Pro-C and the Rainbird ESP-Me. They look different at first glance, but a closer inspection shows that they have essentially all the same functions.
What do you need to know to be able to set your controller this spring?
Time/Date: This is an important detail to keep up-to-date so that you are watering at the correct time and on the days that you want to water.
Zone/Station: A zone, or station, is all the sprinklers or drip lines that are controlled by a single valve. You may have one sprinkler valve and one drip valve split between your front and back yard. Each one is a separate zone which means you have two zones.
Program: Programs are how you group your zones that have plants with similar water needs. Using the above example:The lawn sprinkler zone would be selected on Program A. If the drip zone has similar water needs (trees and shrubs) you would group them both on Program B. This is because your lawn (Program A) needs to be watered differently from your trees and shrubs (Program B). If you have an additional zone, like for a vegetable garden, you will put that drip zone in Program C to water differently.
Start Time: It is important to know that the start time applies to the whole Program, not to each zone in a program. Controllers will run zones in succession within a program.
Run Time: This is the amount of time each station, or zone, waters every time it comes on
Example of spring programming:
Program A starts at 6:00 a.m.and your lawn sprinkler zone runs for eight minutes. Program A, zone 1, will quit watering by 6:08 a,m. If you had more lawn zones, they would water one right after the next.
Program B, your trees and shrubs zone starts at 10:00 a.m. It runs for 75 minutes so Program B would end watering at 11:15 a.m.
Days to Water: Once again, the days to water apply to all the zones, or stations in one program.
Example of spring programming:
Program A, your lawn, needs to be watered once or twice a week in the spring so you would set Program A to run twice a week.
Program B, your trees and shrubs, need to be watered only once a week in the spring so on Saturdays, for example, when you know that you have a better chance of checking the system for issues.
Tips & What to Watch For: Here are some tips to make programming easier and some tips to avoid common mistakes
Create a seasonal or monthly calendar and hang it up next to your controller.
Label each zone (Example: Zone 1 - front lawn close to the street)
Create calendar reminders for yourself, either on your phone or paper calendar, for each season.
Normally you won’t change the amount of time each zone waters seasonally, just how often you are watering.
Always double, or triple, check which program and zone you are on when you adjust the settings so you don’t end up setting a lawn zone to water like a drip zone.
Make sure you are back at Auto/Run whenever you have finished making adjustments. Your controller may not run at all if it isn’t, or it may revert to its emergency programming (usually 10 minutes for every zone, every day).
Replace your battery back-up every year. You don’t want to reprogram your whole controller if the power goes out.
Links to common controllers found in the Albuquerque area:
Author: Richard Perce, Irrigation Efficiency Specialist with the Water Resources Division for the Water Authority. Have a question about the article? AskAnExpert@abcwua.org
According to the National Weather Service, 2020 tied with the second warmest and fourth driest year on record. As we go into this season with deepened drought conditions, let’s discuss last year's weather events.
Water usage is affected by various factors including weather conditions and events. Water usage is also intimately interconnected with the day-to-day decisions each of us makes when using our most precious resource in the southwest. While we can’t control the weather or unexpected events, we can all make a difference by looking for simple ways to be more water savvy at home. Consistently checking for leaks and replacing indoor and outdoor fixtures with a water sense label is a good place to start. And, you can sign up for one of our new classes that will teach you how to service your irrigation system and how much to water your plants.
Information extracted from two reports produced by the National Oceanic and Atmospheric Administration (NOAA); 1) “Assessing the U.S. Climate in 2020” and 2) “2020 NM Annual Weather Highlights”.
Temperature
In 2020 the statewide average temperature was well above normal (by 3.2 degrees), and by end of the year, the state drought conditions ranged from severe to exceptional intensity.
Here in Albuquerque, the temperature tied the fifth warmest year on record, and by mid-October, Bernalillo County entered into a drought advisory.
According to the report published by National Centers for Environmental Information, titled “Assessing the U.S. Climate in 2020", the U.S. has had five warmest record years since 2012.
It was also the most active wildfire year on record across the west. Five of the six largest fires in California history, and the three largest fires on record in Colorado, occurred during 2020.
We are starting the season with intensified drought conditions and with that our customer outdoor demand is likely to increase.
Precipitation
Average precipitation for New Mexico was 5.57 inches below the normal average of 13.99 inches per year. This makes it the fourth driest year recorded.
In Albuquerque, the range of rainfall by zip code is between 8-12 inches per year and the average precipitation was 50% below normal in 2020. Recorded precipitation for the Albuquerque airport was 5.88 inches ranking 2020 as the 23rd driest in 128 years and the driest in the last 10 years.
Our neighboring states, Nevada and Utah, ranked the driest on record for 2020.
This winter season was between 30% and 50% drier than normal, and the spring season outlook seems dry. To assure you are watering efficiently all season make sure to follow our seasonal watering recommendations
