Antelope Valley, CA. We provided technical support and expert witness testimony for the largest groundwater basin adjudication in California. Litologic model of the San Bernardino area. We developed a 3-D lithologic model of the San Bearnardino area. Santa Ana River, CA. The Integrated Santa Ana River Model is used to identify impacts to wildlife caused by groundwater recharge projects.

What We do

Reliable Groundwater Production

Our expertise comes from practical, hands-on experience designing and working on more than 1,000 municipal, high capacity water wells. We also design and supervise well construction for municipal and private clients and are often called upon to help increase water production efficiency and troubleshoot and test existing wells for water quality and other issues. Our team helps agencies assess and manage well infrastructure to prolong well life, minimize long term expenses, and improve water supply reliability.

  • Well siting and specifications
  • Well operation modeling and scenario development
  • Design
  • Rehabilitation
  • Construction observation
  • Well development
  • Inland and ocean desalination subsurface intakes
  • Slant wells
Did You Know

We are one of the first firms to study well screen design and its effect on good efficiency. In the early 1980s, we teamed with Roscoe Moss Company to develop one of the world’s largest aquifer models to empirically study well screen and filter pack configuration and efficiency. Our results were published and form the basis for well design standards still used by the industry today.

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Production wells consist of four primary components, a hole in the ground, a perforated pipe (well screen), a specially designed mix of gravel (filter pack), and a pump. While the materials are simple, determining the best location, screen location and size, appropriate gravel mix, and pump, is a complex task, and varies based on location. If the design of any of these components isn’t just right, the well can underperform, increase production costs, or in extreme cases fail. By carefully designing each element, we can help prevent problems with the finished well such as higher production costs, poor water quality, lower production, interference with nearby wells, or well failure in extreme cases.

Sustainable Groundwater Management and Modeling

We were one of the first firms in California that focused solely on groundwater modeling and studies. Our team has deep technical expertise using models and studies to help our clients meet their water supply needs and challenges based on sound and comprehensive data. Our capabilities include:

  • Groundwater and surface water modeling using MODFLOW, GSFLOW, HSPF, Petrel, and others
  • Geohydrological assessments and analyses
  • Groundwater flow and solute transport models
  • Groundwater basin models
  • Fate transport studies

Successful basin management requires a thorough knowledge of basin geohydrology, understanding environmental issues and concerns, collecting accurate and comprehensive data, and developing adequately calibrated models. For nearly four decades we have designed and implemented sustainability plans for numerous California water agencies, including those with jurisdiction in overlying basins or in basins covered by multiple agencies. Because of our experience, we can efficiently help clients complete groundwater management plans and comply with SGMA requirements.

  • Groundwater Sustainability Plans (GSP)
  • SGMA Compliance
  • Geohydrological assessments and investigations
  • Drinking-Water Source Assessment and Protection (DWSAP) Program
  • Sustainable yield/perennial yield
  • Urban groundwater management plans
Did You Know

Groundwater models work by dividing the groundwater basin into horizontal layers ranging from a few feet to hundreds of feet, stacked on top of each other, and cells that can range in size from a few miles to a few hundred feet, depending on the local geology.

Augment Groundwater Supply

Groundwater Recharge

Groundwater recharge and storage projects help communities save water for a not so rainy day. By letting excess water from storms, imported sources, and recycled water seep back into the aquifer, water providers can augment their supply during dry years. However, not all locations are suitable for groundwater storage and recovery. There may be impermeable barriers that prevent water from seeping into the ground, the local geology won’t hold much water, or the groundwater flows away from the point of recharge before it can be recaptured.

Our team at Geoscience can help agencies develop groundwater recharge and augmentation projects. We are often called upon to help identify areas that are best suited for groundwater recharge and recovery, determine the amount of water capable of being stored in the aquifer, tracing groundwater flow, and determining the amount of recovery possible. We also, help design and test recharge basins, injection wells, and recovery wells.

Geoscience provides support for the following:

  • Artificial recharge
  • Conjunctive use, storage, and recovery
  • Groundwater modeling
  • Develop lithological models
  • Facility placement and design
  • Tracer testing
Did You Know

According to the California Department of Water Resources, there are between 850 million to 1.3 billion acre-feet of storage available in California’s groundwater basins. An acre-foot is the amount of water it takes to cover one acre in a foot of water—that’s 325,851 gallons of water. That means that we can potentially store enough water underground to cover the entire State of California in eight to 12 feet of water!

Inland Desalination

Many groundwater basins within California cannot be used for water supply because it has a high salt content. While not as salty as the ocean, the water in these basins have a high enough salt content that they cannot be used for domestic or agricultural use without treatment.

Geoscience often helps water providers to quantify the amount of salt in the groundwater and locate areas with the highest concentrations. We also help determine the amount of saltwater that can be produced to help determine the type of treatment system needed. Our team also designs production wells for the desalting facility and observes field activities during construction.

Ocean Desalination

The ocean provides a nearly limitless source of water and can be a critical source of supply in times of drought. While most desalination facilities use open ocean intake systems that draw water directly from the ocean, many water providers are beginning to use subsurface intake systems such as vertical beach wells and slant wells to provide water to their desalination facility. Subsurface intakes draw salty water from beneath the ocean floor—virtually eliminating impacts to marine life.

Geoscience can help determine the feasibility of subsurface intake systems, calculate potential production rates, and design subsurface intake systems. We also provide field observation during construction and can provide ongoing monitoring support.

Defend Groundwater Rights

Our experienced and knowledgeable staff are commonly called upon to support a variety of groundwater related legal issues and litigation. We have successfully helped defend our clients by providing expert testimony, provide dispositions, prepare exhibits, provide independent reviews, and other support. Below are some of the types of cases that we routinely support:

  • Flooding
  • Landslides
  • Surface and groundwater rights
  • Groundwater adjudications
  • Well construction defects
  • Insurance Cases
  • Contamination/groundwater quality
  • Groundwater protection

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