Helix is one of a dozen local water agencies taking part in a countywide WaterSmart Landscape Contest this year.
Previously known as the California-Friendly Landscape Contest, the annual competition, now in its 17th year, rewards water-efficient landscapes created by customers of Helix and other participating agencies around San Diego County.
Landscape designs using the least amount of potable water necessary are greatly encouraged in arid or Mediterranean climates like in San Diego County. It’s an important motivation for homeowners to consider efficiency and sustainability to lower water use, saving a precious resource.
Landscape designs using the least amount of potable water necessary are greatly encouraged in arid or Mediterranean climates like in San Diego County. It’s an important motivation for homeowners to consider efficiency and sustainability to lower water use, saving a precious resource.
Maximizing your landscaping’s ability to capture and use natural rainfall can also help reduce or even completely eliminate your reliance on potable water for irrigation. Compare how much water your new landscape design will need against your existing landscaping’s water use. You’ll be able to estimate your future water savings.
Start by calculating the water use requirements of landscaping filled with plants that require high amounts of water, or moderate amounts, low or very low water requirements.
In these examples, evapotranspiration (ET), irrigation efficiency, and landscape area are exactly the same. The only difference: our examples are home to plants with different water requirements.
To calculate water use, you can refer to the San Diego Water Efficient Landscape Ordinance for guidance. Go to www.sdcounty.gov and search “Landscape Ordinance.” The four key variables are:
Use a landscaped area of 1,000 square feet, with an ET of 51 inches annually, and IE of 0.7. Look at the big difference your plant selection can make in your water use.
Example 1: High Water Use plants (PF = 0.8) – 36,137 gallons of water per year
Example 2: Moderate Water Use plants (PF = 0.5) – 22, 586 gallons of water per year
Example 3: Low Water Use plants (PF = 0.2) – 9.034 gallons of water per year
Example 4: Very Low Water Use plants (PF = 0.1) – 4,517 gallons of water per year
From the highest estimate to the lowest estimate, you could potentially save 17,103 gallons of water every single year.
This article is part of a year-long series inspired by the 71-page Sustainable Landscapes Program guidebook. The Water Authority and its partners also offer other great resources for landscaping upgrades, including free WaterSmart classes at WaterSmartSD.org.
Dry conditions in the Southwest, largely associated with La Niña, have intensified what the National Oceanic and Atmospheric Administration is calling the most significant U.S. spring drought since 2013, affecting an estimated 74 million people.
The 2021 drought is quickly becoming an emergency. Kern County’s supply from the State Water Project has been reduced to just 5 percent of a full allocation. Rainfall is about half of average. And with each passing dry day, the drought gets worse.
The Mendocino City Community Services District board declared a Stage 3 drought at its latest meeting, March 29. The district has recorded approximately 20.5 inches of rain for the year to date; this is the second-lowest recorded total in the past 100 years.
A Stage 3 drought includes the following mandates:
California could be facing a dry summer after two dry winters, but there shouldn’t be a huge impact on local supplies.
California water officials have already cut in half the amount of water they expect to deliver from the state water project.
That could be a major cut for central valley farmers and other water users that rely heavily on the Sacramento Delta for their water.
A series of key decisions await Gov. Gavin Newsom as the state heads back into a potential drought.
So this seems like the right moment to review what happened last time: Water was prioritized for big agriculture at the expense of the Sacramento-San Joaquin Delta, endangered species and California communities. The State Water Board, in a review of the drought of 2014-15, found operations “not sustainable.”
Landscaping plants have different water needs. The water requirement of each plant in your landscaping can be determined by gathering information about the plant and then comparing it to the amount of water needed by the cool-season grass growing in your climate zone.
Landscaping plants have different water needs. The water requirement of each plant in your landscaping can be determined by gathering information about the plant and then comparing it to the amount of water needed by the cool-season grass growing in your climate zone.
Take a tip from landscaping professionals. They use a resource called the Water Use Classification of Landscape Species to classify plants according to their water requirements, called Plant Factors.
These water requirements divide plant species into four categories: Very Low, Low, Moderate, and High.
When you are selecting plants for your landscaping, use the classification to choose low water use plants for your landscaping. You can also use it to group a handful of higher water use plants together if you want to indulge in a few favorites.
When you have decided on your plant palette and placement, you can now figure out the water use of your entire landscape area. This will help you plan out your artificial irrigation.
Determine water use before choosing plants for your new sustainable landscaping. Photo: San Diego County Water Authority
Watering needs for landscape plants use a measuring stick based on cool-season turf. It’s because cool-season turf is extremely thirsty.
When you replace turf areas with climate-appropriate plants that use less water and irrigate them with more efficient systems, you can conserve a tremendous amount of water. You don’t need to turn your landscaping into a dry and dusty area to do it.
High Plant Factor: Plants needing 60 to 100 percent of the water needed for a grass lawn (PF of 0.6 – 1.)
Moderate Plant Factor: Plants needing 30 to 60 percent of the water needed for a grass lawn (PF of 0.3 – 0.6)
Low Plant Factor: Plants needing 10 to 30 percent of the water needed for a grass lawn (PF of 0.1 – 0.3)
Very Low Plant Factor: Plants needing 10 percent or less of the water needed for a grass lawn (PF of less than 0.1)
According to the San Diego County Water Authority’s Sustainable Landscaping guidebook, plant selections are colored-coded to identify their water needs under this system. It gives you an easy way to group plants by their water requirements in your new landscaping, so you can irrigate them more efficiently.
This article is part of a year-long series inspired by the 71-page Sustainable Landscapes Program guidebook. The Water Authority and its partners also offer other great resources for landscaping upgrades, including free WaterSmart classes at WaterSmartSD.org.
