Today is World Water Day and it just so happens that Jerry Yudelson, noted green building authority and author, has released a new conceptual tool to help people understand where water will come from in the future.  The tool mimics the popular Pyramid of Conservation used by Minnesota Power and explains water sourcing in ten increasingly expensive and complex steps.

As shown at the base of the pyramid, it’s easy and relatively cheap to use less water.  It’s a lot more complicated and expensive to desalinate ocean water for human consumption.  Here are the ten steps:

• Behavior – education, audit, water pricing, conservation, construction codes
• Low-cost/no-cost – leaks, aerators, low-flow showerheads, shower timers
• Irrigation – native or adaptive landscape, drip systems, web-based irrigation, sub-metering
• Hygiene – retrofits, low-flow toilets, water-free urinals, rebate programs
• Appliances – dishwasher, clothes washer, water softener
• Extreme Makeover – compost toilets, hardscape, no irrigation, on-site black water reuse
• Water Heating – solar water heating, hot water loop, efficient water heater
• On-site Reuse – rainwater collection, gray water, irrigation
• Off-site Reuse – sewer mining, purple pipe systems
• Desalination, New Water Sources

Of course, some of these can be done at home (i.e., retrofits, water-saving appliances, water heating), while others require a larger effort (i.e., desalination, off-site reuse).

Water is a precious resource that must be protected, and this is a primer to get that started.  All in all, this is a straight-forward, dead-simple graphic that can help us evaluate how to do that.

[=] Download a copy of The Pyramid of New Water Sources.

Credit: Yudelson Associates.