The Design Observer Group


Posted 03.21.12


Hadley Arnold & Peter Arnold

Drylands: Water and the West



[Photos by Peter Arnold]

By definition, water scarcity is the central challenge of sustaining life in arid lands. It’s easy to forget how large that challenge is: Arid and semi-arid lands make up one-third of the earth’s land surface and over one-third of the continental United States. The 20th-century American effort to provide water to these lands in the name of social progress and economic growth has given rise to some of the most spectacular civil engineering feats in history, and has served as one model for water systems internationally.

In the century that followed the 1902 Newlands Reclamation Act, the engineers of the American West constructed a 500,000-square-mile watershed designed to do two things — deliver us snowmelt and rid us of stormwater. The engineering (and ideological) paradigm behind this synthetic watershed is stationarity: the notion that systems fluctuate within an unchanging envelope that can be described, modeled and predicted. Predicated on a constant supply of political will, financial capital, cheap energy and Holocene hydrology, the American system is designed to flatten topography, culture and time.

The photographs of 20th-century structures presented in the first half of this slideshow constitute a contemporary archaeology of the architecture of stationarity.


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That system is now nearly obsolete. Its infrastructures have accelerated and exacerbated the largest and least understood environmental challenge of the 21st century: water is changing. It takes a lot of energy to transport snowmelt across deserts to agricultural and urban centers; likewise, in a negative feedback loop, it takes a lot of water to produce that energy. The carbon-intensive fuels used to deliver western water — mostly coal and natural gas — contribute to a warming climate that is reallocating the hydrologic cycle. Projected climate impacts in the Western United States include longer droughts, less snowpack and more intensive rain events.

Intelligent water solutions will break western water’s reliance on carbon-intensive energy for long-distance transport, and will look again to localized systems and reposition the hydrographic basin as the basic unit of durable occupation. In both urban and rural centers, a healthy Anthropocene will see a de-industrialization of water systems, an insurgence of adaptive alternatives and a design reckoning with a new paradigm of variability that replaces the assumption of stationarity.

Our exploration of the engineered surfaces of the West, industrial and pre-industrial, has led us to consider alternative models of irrigation societies — some archaeological, some historical, some contemporary — that operate outside the predominant American model and offer promising possibilities for re-imagining hydrologic urbanisms and architectures.

Examples of adaptive technologies and robust settlement patterns that we have photographed along the Lower Colorado River and the Upper Rio Grande include:
In the coming years, the portfolio of water systems and water cultures of the West will begin to re-diversify and de-industrialize. These photographs are intended to frame questions that can be explored through an open-ended design process with students and community collaborators. How are water systems integrated, not only functionally but also formally, in the design of dryland urbanisms? Under what conditions does the architecture of water systems shape strong public space? When do water infrastructures serve as instruments of social control and when do they serve as instruments of collaborative commonwealth? At what scale can water systems support not only sufficient volume but also biological and cultural diversity? What competing definitions of “efficiency” are at work in these photographs? What is fragile here, and what endures, and why?

These photographs remind us of the wide terrain of innovation written into the surfaces of the West, a record of adaptive design that transcends the 20th-century presumption of indefinite abundance.