In low precipitation periods – where and how is the limited available water distributed and what possibilities are there for improving retention in the soil and the landscape?

Groundwater makes up 30 to 50 percent of California’s water supply, but until recently there were few restrictions placed on its retrieval. Then in 2014 California became the last Western state to require regulation of its groundwater, and water managers in the state’s premier agricultural region – the state’s Central Valley – are tasked with estimating available groundwater. It’s a daunting technological challenge – but scientists can help by pairing satellite data with high-resolution monitoring to estimate groundwater depletion.

The prevailing wisdom for wave energy capture has been to construct a large installation offshore, a few kilometers in the middle of the sea. But, says one expert, that’s expensive and unreliable. Offshore waves can reach tsunami-like heights that can pulverize the equipment, so few insurance companies have been willing to cover these kinds of installations and, if they do, it’s at a high cost. There is a less expensive, safer alternative: Installing “floaters” on existing manmade structures – piers, jetties and breakwaters – and putting the main energy-creating equipment with its sensitive computers and generators on land.

Reusing low-saline oilfield water mixed with surface water to irrigate farms in the Cawelo Water District of California does not pose major health risks, as some opponents of the practice have feared, a new study finds.

Farmers in parts of the western United States who rely on snowmelt to help irrigate their crops will be among the hardest hit in the world by climate change, a new study reveals. The study pinpointed basins globally most at risk of not having enough water available at the right times for irrigation because of changes in snowmelt patterns. Two of those high-risk areas are the San Joaquin and Colorado river basins in the western United States.

By 2030, global warming alone could push Chicago to generate 12 percent more electricity per person each month of the summer. If the city generated any less electricity, it would be risking a power shortage that may require drastic measures to avoid rolling blackouts, according to projections from a model designed by Purdue University researchers.

Providing potable drinking water to deployed troops operating in low resource or contested environments is no simple undertaking. Logistics teams face great risk delivering water and often incur what would otherwise be preventable casualties. Low-power extraction technologies could capture potable water from ambient arid air, giving deployed troops greater mission flexibility.

A cluster of internet-enabled devices, including a water-flow sensor, pH sensor, ultrasonic sensor, and “PIC” microcontroller, may be used together as a watchdog system for water quality.The simple and low-cost system being developed by the team of researchers in India makes water quality assessment and water security widely available without the need for sophisticated technical knowledge.

Tension is rising between Egypt and Ethiopia over the huge Ethiopian dam project on the Nile. Egypt is worried that the construction of the Renaissance Dam, a $4 billion dollars project launched by Ethiopia in 2012 and scheduled to start operations in 2022, will substantially reduce water flow in the Nile. Egypt depends on the Nile for about 90 percent of its water supply. Egypt insists on a guarantee from Ethiopia that Egypt would receive a minimum of 40 billion cubic meters of water annually, but Ethiopia argues that this would give Egypt an unreasonably large share of the Nile’s water.