Water Wise House in Mt. Washington

Mt. Washington Home. Source: LA Times

"Those who follow sustainable design say the new residence could very well be one of the most water-efficient houses in the region, a milestone for L.A. as the city seeks better models of conservation. The Nob Hill Haus, as its owner-designers call it, could serve as a template for the house of the future here." (Click here for a link to the full LA Times story.)

Laundry, bath, and sink water flows into this tank before traveling through perforated underground pipes that feed plants. Source LA Times

Partners Frank Pasker and Grit Leipert "let California's scarcity of two resources — power and water — shape the design philosophy for" their new 2,400 square foot Mt. Washington home, which is designed to reduce energy and water consumption to the greatest extent possible. The couple's ultimate goal is to make it a net-zero energy home.

The Los Angeles region is poised to grow considerably over the next couple decades and a similar "design philosophy" is needed for the region to grow sustainably. Climate scientists predict drier and shorter Sierra winters, which means less water for Southern California. As Pasker points out, "California challenges you to do something because of the climate...You want to work with the climate, not against it." Working with the climate, with a particular focus on energy and water, will become the hallmark of successful sustainable design and help shape the future of development in Southern California.

Composting Bins. Souce: LA Times

Green Credentials:

• Gravity fed grey water system with no pumps, filters or electrical devices
• Grey water system treats 160 gallons of water per day, which then waters the yard through a series of underground perforated pipes
• 1,500 gallon cistern used to capture rainwater and water backyard plants
• 50% water use reduction from the typical Los Angeles home
• 120 gallon roof-mounted solar water heater
• 50% thicker walls than required to reduce heating/cooling needs
• 3.2 kilowatt solar array designed to offset any electricity use

1,500 gallon cistern, which holds captured rainwater for plant watering. Source LA Times

Integrating Sustainability into Bus Shelter Design

Bus stations provide an open platform for layering multiple sustainable technologies in a single location. Installing photovoltaic panels on top of bus shelter canopies is one of the most common practices of sustainable bus shelter design. Some cities are also beginning to explore the possibility of using bus shelters to capture and manage storm water.

Solar-powered bus shelter in San Francisco

San Francisco is in the process of rolling out 1,100 new bus shelters that use roof top solar panels to run lights and power an on-site wifi network, which has the potential to provide significant coverage when expanded citywide. The creative repurposing of bus shelters as a platform for advancing environmental and social sustainability goals holds tremendous promise and is an area that is likely to see further innovation, particularly as bus rapid transit lines like the Orange Line (and future Wilshire Line) continue to attract riders.

Solar panels on bus shelter canopy in San Francisco

To understand the potential for leveraging bus shelters as a way to advance sustainability in Los Angeles, consider that Metro operates 15,967 bus stops throughout its service area. If the transit authority built bus shelters similar to those being used in Corona, which use roof top solar panels to feed 1,748 kilowatt-hours of electricity per year into the grid, it could generate roughly 27,910,316 kWh per year of energy. That's enough energy to power approximately 4,560 homes.

15,967 bus stops x 1,748kWh/bus stop = 27,910,316 kWh
27,910,316 kWh/6,120 kWh per LADWP res. customer = 4,560 households

With nearly sixteen-thousand bus stops in the Metro system, there's a tremendous opportunity to use these sites for producing renewable energy, showcasing local artists and providing other socially valuable services like wifi or way-finding information. Given DWP's target for renewable energy production (35% by 2030), the demand for renewable energy in Los Angeles is high and as local capacity for renewable energy production increases, there is less need for running expensive high powered transmission lines through sensitive environmental habitat.

Clearly Los Angeles could be doing more to deploy its own contextually sensitive design for sustainable bus shelters and leverage such a program to advance additional co-benefits for the region: "green" its transportation system, decrease carbon dioxide emissions, reduce storm water runoff, create jobs for the manufacturing and installation of new sustainable bus shelters, expand free wifi coverage, showcase local arts and culture, and enhance the dissemination of important public information.

Sources:

- Renewable Energy World, "City of Corona Turns Bus Shelter into Mini Power Plant"

- Los Angeles County Metropolitan Transportation Authority (Metro)

- LADWP Green Power Annual Report 2009

"Whiskey's for drinking; water's for fighting."

Los Angeles lives on the water it imports from Northern California and the Colorado River. California is expected to add millions of new residents over the next couple decades, many of which are likely to reside somewhere in Southern California. Constrained resources and rising demand make our reliance on imported water unsustainable. Also, transporting water is incredibly energy intensive. According to some estimates, 20% of California's carbon dioxide emissions result from pumping water throughout the state.

Some people are already thinking about to how reconcile the demand for growth and development with the environmental, economic and social imperative to build sustainably. A recent article by Metropolis Magazine discusses the nexus between water and sustainability. The article culminates in a call to action for those interested in designing a sustainable vision for our cities:

"The Living City Design Competition calls on the world’s most ambitious designers to create an inspiring but realistic vision for the future of civilization. Competition teams will conceptually retrofit existing cities, demonstrating how real communities might transform their relationship with the resources that sustain them. These re-imagined cities must achieve each Imperative of the Living Building Challenge, the built environment’s most rigorous performance standard.

To be certified under the Living Building Challenge, a project must capture and treat all of its own water onsite using ecologically sound processes. It must also ensure that 100% of storm water and building discharge feeds the project’s internal water demands or is released onto adjacent sites for management through gradual surface flow, groundwater recharge, agricultural use or adjacent building needs."

Los Angeles River

The challenge to have no net import and no net export of water within a given site is the ultimate metric for water sustainability and ought to be the goal for all buildings in the Los Angeles region. There is no reason why resources and money should be spent to send rainwater out to sea when it could be harnessed for more productive uses, thereby eliminating the need for the costly and damaging practice of importing water.