Category Archives: Hydro Notes

Tucson’s Water Security – Don’t Take it for Granted

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We residents of southern Arizona have a unique relationship with water.  Our water supplies are unseen – pumped from vast underground aquifers or piped hundreds of miles from the Colorado River.  Lacking natural lakes and rivers and with scant rainfall, we invest in backyard pools and irrigated landscapes.  This combination of scarcity and dependency reminds […]

Rate setting in an era of declining demand

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By:  Gary Woodard, Senior Water Policy & Economics Consultant, Montgomery & Associates Arturo Gabaldon, President, Community Water Company of Green Valley Community Water Company of Green Valley (CWC) is a non-profit public service corporation serving customers in Green Valley and Sahuarita for over 40 years.  In July 2015, CWC filed a rate case with the […]

Challenging a paradigm: What we learned by comparing three common groundwater sampling methods

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As a result of this analysis, M&A obtained regulatory approval to use low-flow sampling methods for long-term monitoring, reducing sampling costs by 75 percent. M&A recently had the opportunity to challenge a long-established practice that hydrologists have applied when collecting groundwater samples. This practice, which has been largely driven by environmental regulators, involves “purging” three […]

WSIP’s new paradigm: It’s not just about storing water

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California’s new funding paradigm for water storage infrastructure requires that projects provide environmental benefits as well as hundreds of thousands of acre-feet of new storage. How will the state reconcile this apparent paradox? The answer is via the Water Storage Investment Program (WSIP). This carefully designed, competitive program includes long-term, state agency oversight to ensure […]

Use of chlorofluorocarbons for aquifer characterization

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During the years 1950 to 1980, various chlorofluorocarbons (CFCs) — including CFC-11, CFC-12, and CFC-113 — were used in refrigeration and other systems and released into the atmosphere. These substances then passed from the atmosphere to surface water and groundwater via precipitation as part of the hydrologic cycle. The concentrations of CFCs in groundwater in […]

Managed Aquifer Recharge (MAR) for the mining industry

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As withdrawals from aquifers increase rapidly in the U.S. and around the world, new technologies must be applied to help manage and sustain groundwater resources. Research clearly shows that many of our critical aquifers are not replenished quickly. Fortunately, considerable progress is being made on one technology for aiding in their replenishment — Managed Aquifer […]