Water is a topic that is here to stay, as our water coverage throughout the week has shown.

With increased concern about water scarcity, especially as the climate continues to heat up, companies and governments alike are putting new scrutiny on wringing out every possible inefficiency from their operations.

There are plenty of tried-and-true methods for companies looking to make immediate reductions in water use, and many of the industries most at risk from water shortages or restrictions have found a number of ways to address water issues.

In order to make a step-change in both the depth and the breadth of water efficiency -- that is, saving more water as well as getting more companies and industries to take conservation to heart -- new practices and innovations are going to have to take root.

That is where clean technology comes in. As Joel Makower reported this week, clean energy is on the rise, despite a lack of traditional incentives like climate legislation, high oil prices or a booming economy.

But the ever-widening spotlight on cleantech has to date been almost entirely focused on alternative energy sources like solar, wind and geothermal. Technologies like the mysterious and much-hyped "Bloom Boxes" for fuel-cell energy get the lion's share of the spotlight and funding, while other areas are hung out to dry.

This is beginning to change, as evidenced by a recent prize competition aimed at water-saving tech startups. The ImagineH2O prizes handed out earlier this month, gave a total of $70,000 to three companies that are laying the groundwork for breakthroughs in water efficiency.

And the potential for savings is huge. Scott Bryan, the director of operations at ImagineH2O, explained during the awards ceremony for this year's prizes that, "In some parts of the country, you can save more energy by turning off the tap than turning off the lights."

The winners of the prizes highlight just how wide the playing field is for applications of water-centric cleantech.

Fruition Sciences

The winner of the grand prize, Fruition Sciences is focused on the agricultural space, specifically vineyards. The company has developed a technology that precisely measures the amount of water a grapevine is currently using, and lets vintners know when they should water -- and when they should stop.

Wine grapes produce better fruit when they're "thirsty," Thibaut Scholasch, the co-founder and Vice President of Research and Development at Fruition, told me at the Imagine H2O awards ceremony. But winegrowers have little idea how much is too much, which makes it easy to waste enormous amounts of water in the fields.

"People aren't even aware there is a problem," Scholash said. The company is entering its third year of operations, and with their technology installed in 13 vineyards in California's legendary Wine Country, Fruition has seen impressive results.

The technology has enabled winegrowers to save 24,000 cubic meters of water on a 30-acre vineyard -- that's 150 swimming pools' worth of water, Scholash said. And to top it all off, that water savings also leads to better wines.

Fruition is focused on top-shelf wineries while they're getting up to speed, but as the results begin to bear fruit, Scholash said Fruition plans to expand to wineries the world over.

Next page: The Rainwater HOG and WaterSmart Software