Water Sustainability: A Looming Global Challenge

By Dan McCarthy

The future of water is anything but clear. We face a future world fraught with water

challenges – too much, too little, too contaminated or inaccessible to meet our needs.

We live in a rapidly changing world in which many of our expectations about natural

resources may no longer be met. The seeming abundance of safe, low-cost water may

falsely lead us to assume perpetual easy access to all the low-cost, high-quality water we

want, when we want it.

The water industry today must examine these assumptions. Although water covers 70

percent of our planet’s surface, less than one-half percent is freshwater available for our

use. Most of our planet’s water is in oceans and too salty for many uses. Much of the

remainder is locked in frozen glaciers, is remote from population centers or circulating in

our atmosphere. So this seemingly abundant resource is actually quite constrained.

What’s changing?

Three factors are having an impact on our freshwater resources:

· Population growth – The world’s population is 6.6 billion and growing. As a

result, humans are demanding more of the earth’s resources to sustain life and

economic activity. Science and engineering have been developing and

implementing technologies to alleviate some of this burden. However, there is a

limit beyond which little can be done. It appears probable that we are nearing this

limit.

· Economic growth – Economic growth in water scarce regions increases water

demand. Last year the planet’s urban population exceeded the rural population for

the first time in history. Fifty percent of the world’s population resides in

metropolitan areas, increasing demands on water systems.

· Climate change – Planning and design criteria based on historic records may no

longer be applicable in a world where water resources are heavily impacted by

drought, flooding and/or an increase in mean sea level. As a result, facilities may

be found to be at significant risk in the face of rapid climate change.

Article

As seen in the 3/20/08 edition of the Water Online (www.wateronline.com) newsletter.

Then and now

Previous generations had the luxury of the earth’s excess natural "bio-capacity." The

capacity of the natural systems and cycles that renew our "wastes" and enable the

conditions to support our human and ecological environments was far greater than the

demands of the world’s population.

Currently, however, the growing demand for earth’s natural resources, like water, is

creating an imbalance between the earth’s bio-capacity and its inhabitants’ desired

standard of living.

The good news is that we never destroy water. The earth’s water supplies are fixed:

what we had yesterday is the same as what we’ll have tomorrow. Though many of the

resources needed for economic development are being depleted, water – at least in

terms of quantity – is a constant.

The problem is the location, timing and distribution of rainfall. Our industry’s

challenge is to help communities ensure that water is always where we need it, when

we need it, which is not necessarily where it falls to the earth as rain.

Water, water everywhere, but…

Competition for available water is increasing because water is not distributed evenly

over the globe. Nine countries possess 60 percent of the world’s available fresh water:

Brazil, Russia, China, Canada, Indonesia, the United States, India, Columbia and the

Democratic Republic of Congo. However, local variations of population distribution

and freshwater supply are highly significant. Many communities, once water-rich, are

facing a new challenge as water supply and demand are now imbalanced.

In most European cities with more than 100,000 people, groundwater is being used at

a faster rate than it can be replenished. Available water costs more and more to

capture or draw from aquifers. Large cities like Mexico City, Bangkok, Manila,

Beijing, Madras and Shanghai have experienced significant aquifer drops of between

10 to 50 meters.

Other water scarcity examples include the Yangtze River Basin in China; Australia,

now in its 10th year of a record drought; the Colorado River basin, also in the midst

of a long-term drought of historic proportions; and parts of the Southeast United

States, especially northern Georgia.

Droughts or increased flooding may not be the only unfortunate consequence of

changing rainfall patterns. These changes may also result in storm sewers and

drainage systems that are inadequate to handle current and future needs because they

were built on past assumptions that may now be invalid.

Article

As seen in the 3/20/08 edition of the Water Online (www.wateronline.com) newsletter.

Preparing for an uncertain future

We are moving from what has been viewed as a time of certainty within our industry

to a time of great uncertainty; we’re being driven by the forces of change in our

climate – and in the water business.

The challenge for key global water industry players, like Black & Veatch, and for our

clients around the globe is to develop and implement sustainable solutions that will

better manage the entire water cycle and help their customers and communities

prepare for an uncertain future.

These solutions will focus on how best to protect water at its source, treat it to the

highest standards, deliver it to homes and businesses, and then collect and again treat

the wastewater before reintroducing it safely back into the environment. We also seek

methods of sourcing "new water" through reuse, aquifer storage and recovery or

desalination of water, for example.

Political leaders at all levels and the general public want to know what their utility

leaders are doing to prepare for these challenges. They realize that water suppliers,

regulators and customers can’t simply discuss or debate the future as it arrives; they

must plan and take action today to minimize uncertainty and risk. All stakeholders

must work together to craft robust long-term strategies and implement cost-effective

solutions for mitigating and, if necessary, adapting to the potential impacts of climate

change.

Taking the long view

The water industry must focus on the long view when facing the challenges of rapid

population and economic growth, along with supply deficiencies or wet weather

problems. And added to those trends are other pressing issues, like aging water

infrastructure, degradation of water quality, changes in water rights and tightening

regulations.

That’s why Black & Veatch and other leaders in the global water industry are

working to develop innovative solutions to address climate change, water scarcity and

sustainability planning. We are seeking triple-bottom-line solutions that meet our

clients’ social, economic and environmental goals; are sustainable; and are politically

and commercially viable.

Just as in the 1990s, when decision making shifted from capital costs to life-cycle

costs, now in the early part of this century, the importance of triple-bottom-line

decision making is being recognized and emphasized during all stages of planning.

Article

As seen in the 3/20/08 edition of the Water Online (www.wateronline.com) newsletter.

Managing the future

The ultimate stakeholders in this debate are yet to be born. One thing is certain:

coming generations will not take water for granted. Because the future of water is

dynamically bound to the present, now is the time for far-sighted leaders to act.

Sustainable planning is no longer an isolated challenge; regional solutions require

integrated planning among municipal, industrial and agricultural water users.

Proactive watershed management is key to helping a community optimize its water

opportunities. A holistic water review should examine the best combination of

solutions for a community – conservation, non-potable reuse, indirect potable reuse,

impaired waters from brackish or contaminated waters, desalination or water sharing

among adjacent communities. These are not easy decisions – but they must be

addressed.

(About the Author: Dan McCarthy is President and CEO of Black & Veatch’s global

water business, with headquarters in Kansas City, Mo.)

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