Category Archives: Hydro Notes

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 […]

Data-worth analyses reduce uncertainty and improve water management

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Environmental models are used to make predictions that form the technical basis for water-management decisions. For example, groundwater flow models can be used to predict the impacts of pumping on nearby surface water bodies, to inform mine dewatering activities, and to guide the design and operation of remediation facilities. Environmental model results are often presented […]

Land subsidence and earth fissures in southern Arizona

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If you’re a typical Arizonan, you’ve probably heard about land subsidence or perhaps even witnessed its effects firsthand driving along the I-10 corridor between Tucson and Phoenix. What is land subsidence and where does it occur? Land subsidence results from the compaction, consolidation, or collapse of aquifer sediments and occurs throughout southern Arizona, in rural […]