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 […]
Category Archives: Hydro Notes
Grouted-in pressure transducers: A cost-effective approach for characterizing mine sites
This is Part 1 of two articles on grouted-in pressure transducers. Part 2 will present some case studies to show some innovative applications of this technology. Grouted-in transducers allow the monitoring of pressure heads in multiple aquifer zones — without the costs or regulatory requirements of wells. First introduced in the 1960s, fully grouted pressure […]
Quantifying “final” ecosystem service values: A Santa Cruz River example to build on
Matthew Weber, Ph.D., is a hydrologist and water resources economist who recently joined M&A. During his previous employment at the USEPA, he served as a principal investigator for a study that examines how the public values ecosystem services associated with the Santa Cruz River. This Hydro Note recaps some highlights of this study, which is […]
Use of chlorofluorocarbons for aquifer characterization
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
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 […]
Estimating brine Mineral Resources and Reserves: A hydrogeologic perspective
This is part 2 of our series on brine mineral resources. Part 1, “How economic brines form in closed basins” was the subject of our June 2015 HydroNote. — Daniel S. Weber, P.G. M&A routinely characterizes hydrogeologic conditions in closed hydrologic basins — known as “salars” in South America — that feature porous and/or fractured-rock […]
Data-worth analyses reduce uncertainty and improve water management
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 […]
Has groundwater pumping in Big Chino Basin affected the Upper Verde River?
This is part 2 of our series on the Upper Verde River. Part 1, “What is the source of the Upper Verde Springs?” was the subject of our August 2015 Hydro Note. —Ed McGavock The debate continues over the potential effects of groundwater pumping in the Big Chino basin on base flows in the Upper […]
Land subsidence and earth fissures in southern Arizona
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 […]
Arizona’s Groundwater Management Act: A model that incorporates policy, science, economics, and flexibility
Thirty-five years ago, Arizona adopted its groundbreaking Groundwater Management Act (GMA). Although still a work in progress, the GMA’s success can largely be attributed to four key characteristics: Public policy that considers local circumstances A scientific basis Consideration of the dynamic economics of complex urban and urbanizing environments Flexibility afforded by a long, phased implementation […]