4 Reasons Why Urban Landscapes are a Linchpin for Climate Resilience

By Cora Kammeyer

Cora Kammeyer is a researcher at the Pacific Institute, and her work focuses on corporate water stewardship and California water policy. The Pacific Institute is a nonprofit water sustainability think tank. Our mission is to create and advance solutions to the world’s most pressing water challenges. To do that, we combine research and policy analysis with active outreach to inform water policy- and decision-making.

Jul 17, 2019 | Resources | 4 comments

When it comes to water sustainability and climate resilience, urban outdoor landscapes represent a wealth of opportunity.

Outdoor landscapes are a vital component of our cities. Whether it’s outside a home, a store, an office, or a manufacturing plant, the landscape is a property’s primary interface with the community and the environment. Properly designed and managed using sustainable landscape strategies, these outdoor areas can help communities weather droughts, mitigate floods, sequester carbon, improve human well-being, and more.

We can build sustainable landscapes, by which I mean landscapes that are in balance with local climate and ecology and actively contribute to watershed health. Key elements of sustainable landscapes include:

  • Building healthy soils
  • Preserving vegetative cover
  • Using climate-appropriate plants
  • Conserving water and other resources

This could include strategies like removing turf, building rain gardens, or installing permeable pavement or rain tanks.

To achieve sustainability, we need to make some changes.

Take California, my home state, as an example. California has notoriously variable precipitation patterns, and this is increasing with climate change. We are seeing longer and hotter droughts, and more intense storms; and more dramatic fluctuations between these two extremes. This means that our cities are facing increasing threats of water shortage on one hand, and flooding on the other.

Our current urban landscapes, marked by big lawns and paved areas, don’t do much to alleviate these problems. In fact, in many cases, they exacerbate them. Thirsty turf grass requires a lot of irrigation, especially in the peak of summer when it’s dry and hot, and water is in shorter supply. Over half of urban water use in California goes to landscape irrigation, and that portion is higher in the summer. Vast expanses of pavement—parking lots in particular—leave no place for rain water to go but down the drain, which has limited capacity to handle intense storms, leading to flooding and pollution.

There is a better option.

We can turn our urban landscapes into assets for climate resilience, rather than a source of risk. For example, look below at this side-by-side case study of two residential yards in Santa Monica, California (sustainable landscape on the left, traditional landscape on the right). Nine years of monitoring both landscapes showed that the sustainable landscape uses 83 percent less water, creates 56 percent less green waste, and requires 68 percent less maintenance than the more traditional landscaping.

 

 

 

 

 

(Santa Monica garden/garden case study)

Sustainable landscapes can provide a multitude of benefits, but I’ll focus on four themes here: drought, flood, carbon, and community.

Sustainable landscapes are resilient to droughts.

There are two key ways that sustainable landscapes can make urban communities more resilient to drought: using less water, and capturing water to use later.

Replacing grass with climate appropriate plants (and irrigating those plants properly) can reduce a landscape’s water needs by 70-80 percent. During the last California drought, we saw homes across the state doing this, a trend significant enough to be clear on Google Maps. This was a big part of why California’s urban communities were able to meet, in fact exceed, the emergency drought mandate of reducing water use by 20 percent.

Sustainable landscapes can also be designed to capture water and hold it—in the soil, groundwater, or rainwater catchment systems—for future use. Building healthy soils allows water not taken up by plants to infiltrate into the landscape, and even down into groundwater aquifers, rather than running off and being lost down the drain. Similarly, rain barrels and tanks can capture roof runoff, which can then be applied back onto the landscape when it’s needed. Research shows that applying these approaches across southern California and the San Francisco Bay Area could increase local water supplies by 20 billion gallons each year, which is roughly the amount of water used by the city of Los Angeles annually.

Sustainable landscapes help reduce flooding and water pollution.

As the climate warms, California is experiencing more precipitation in the form of rain (versus snow), and these rain events are growing in intensity. Our urban areas, particularly those in southern California, will need to better prepare for these storms, and in particular improve flood management. As discussed above, sustainable landscapes are great at capturing and holding water; this is also useful for mitigating local flooding. If water can run into rain gardens and soak into the soil, that means less water pooling on streets, parking lots, and sidewalks. Beyond designing existing green spaces to hold flood waters, reducing the amount of paved area and replacing it with permeable paving or more green space can greatly contribute to local flood reduction.

These strategies also help prevent water pollution in our oceans and stream, because sustainable landscapes can absorb and purify the “first flush” of a rain event, which contains the most polluted water (carrying all the grime and contaminants from our city streets).

Sustainable landscapes sequester carbon and reduce greenhouse gas emissions.

Water, energy, and land use management are all intertwined and deeply connected to climate. Healthy soils rich in organic matter, a key component of sustainable landscapes, can sequester carbon from the atmosphere, providing climate mitigation. Sustainable landscape practices can also reduce energy use (and associated greenhouse gas emissions) because they require less mowing, blowing, and green waste hauling than typical grass-dominated landscapes. There is also the energy embedded in water to consider—less irrigation (through climate appropriate plants and capturing water for reuse onsite) means less water that needs to be collected, treated, and transported to a landscape.

Sustainable landscapes improve community well-being.

Finally, sustainable landscapes provide benefits to human-scale benefits to communities, beyond helping them weather droughts and floods. Switching from outdoor areas dominated by grass and pavement to ones with beautiful native plants and expanded natural spaces improves our well-being. For example, there is research showing the employees who have access to sustainable landscapes at their workplace are happier and more productive. In addition, sustainable landscape practices (especially replacing pavement with rain gardens) can help combat the urban heat island effect, a public health threat which is growing worse with climate change.

Transitioning to sustainable landscapes in cities around the world requires innovation and collaboration.

The challenge (and opportunity) of achieving resilience to droughts and floods, reducing carbon emissions, and fostering community well-being is one faced by cities around the globe. These are imperative and deeply interconnected issues, and urban landscapes lie at a critical nexus among them all.

With urbanization increasing rapidly, and climate change impacts manifesting more prominently every year, the call to action is becoming more urgent. Tackling this multifaceted challenge will take the efforts and collaboration of diverse urban stakeholders, from residents, businesses, scientists, city governments, and on-the-ground change makers. At the Pacific Institute, a nonprofit organization focused on water and climate, we have been working for over 30 years on advancing innovative solutions for water-smart cities, including sustainable urban landscapes.

Discussion

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4 Comments

  1. I switched to Native California landscape in 2007-2008 and have seen a 75% reduction in TOTAL water use in the summer — the remaining 25% being mostly household use. And lower maintenance. And the maintenance I have to do is more rewarding. And I got to get rid of the lawnmower, spreader, trimmer, and other lawn maintenance equipment, the gasoline can, and the space to store it all. And I have far more bees, and birds (especially hummingbirds, but also finches) and lizards in the yard. And the yard smells AMAZING (salvia, ceanothus, fuschia, etc.). And it is more beautiful, with flowers blooming all year (manzanitas in Dec-Jan). It’s all good!

    But the reality is that most water is used in agriculture, and much of that on things like alfalfa, which is grown to feed cattle for meat. There is a long way to go before we are using our water resources in anything like an optimal way.

    Reply
  2. Hello, as a naturalist and certified Master Water Steward in Minneapolis, I appreciate your analysis but am concerned at the exclusive focus on humans and the lack of concern and references to wildlife. Humans need to protect and preserve wildlife habitat for its own sake, while at the same time these efforts help humans. I think it’s important to be explicit about the need for native plants, not only for “water efficiency” but because insects and other pollinators are literally dying of starvation–and their populations plummeting–because humans focus on landscaping for human aesthetics and benefits instead of for ecological function and benefits to wildlife. I hope you will take another look at this article and revise to incorporate the need for humans to value and protect all living beings–not just humans. Thank you.

    Reply
  3. I second the comments of Ms. Pepin. One of the most remarkable benefits even in my tiny native landscape is the reappearance of native bees (there are so many varieties!), butterflies, and other pollinators, as well as tiny flies, and spiders that make their webs between the leaves of the plants to catch the flies. It is amazing that I can create such an ecosystem in just a thousand square feet or so, between the herbs, bushes, and new trees. Imagine what a paradise we could create for ourselves with a system of interconnected parks that specifically emphasize diversity in flora and fauna. And my limited experience is that if you plant the flora, the fauna will come. Believe me, it makes a MUCH nicer residential landscape, much less urban landscape.

    Reply
  4. Beautiful contribution as always happens in these articles that I can read, are so close sometimes that tell something about what happens to us is to thank.
    If we lived in a house that had a food garden inside the house, where the water is captured in a complementary way from the atmosphere or rain, and where the gray waters irrigate the garden, the landscape of its inhabitants would change noticeably, and if we can add a architecture without limits by the available space or by the unusual way of seeing the life of its inhabitant, creating exclusive architectural forms with our own energy, and it would be a very high satisfaction also against the possibility of not requiring work outside the area; having where to share this local landscape exchanging the surpluses of the home garden, evidently organic, in a nearby free vegetable supermarket. Maybe the landscape of the faces of these people would be a contribution from their doors, who come to bring beautiful energy to the landscape and environment. Self-consumption and self-generation is the solution to mobility and quality of life in addition to growing without limits contributing.

    Reply

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