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Modflow Articles & Analysis
44 articles found
Groundwater contamination doesn’t move in neat, predictable intervals. Yet for decades, environmental monitoring programs have relied on quarterly or annual sampling as the standard approach to understanding subsurface conditions. While this method has been widely accepted, it introduces a critical challenge: it captures only snapshots in time,not the full story. As regulatory ...
ByLiORA
PFAS contamination remains one of the biggest challenges in groundwater management, with the prediction of nearly 80,000 drinking water sites in the US likely to have contamination exceeding EPA safety limits, putting millions at risk of serious health risks including cancer. The cleanup costs could exceed hundreds of billions of dollars as these “forever chemicals” resist traditional ...
An active petroleum hydrocarbon pipeline site had 20,000 m3 of impact and an initial plume area of 8,100 m2 based on an environmental consulting firm’s Phase II Environmental Assessment. An active recovery program over five (5) years had recovered approximately 14% of the released product but was discontinued due to declining extraction efficiencies with high operating ...
ByLiORA
Client: Toronto and Region Conservation Authority Don Ford, P.Geo. Manager, Hydrogeology, 5 Shoreham Drive, Downsview, ON M3N1S4 Tel:416-661-6600×5369 [email protected] Key Personnel: Dirk Kassenaar and E.J. Wexler Working for the Toronto and Region Conservation Authority (TRCA), Earthfx provided key surface water and groundwater analysis components of the Humber River Watershed Plan. The ...
Recharge estimates were applied to a USGS MODFLOW groundwater model to evaluate long term changes in groundwater levels under a variety of scenarios, and particle tracking simulations from high discharge reaches were used to understand groundwater flow pathways. ...
The numerical groundwater flow model was built using the US Geological Survey MODFLOW code. A model grid was designed with square cells, each 100 m on a side. ...
Client: Trent Conservation Coalition Drinking Water Source Protection – Lower Trent Conservation: Ms. Andrea Hicks, 714 Murray Street, R.R. #1, Trenton, ON K8V 5P4 Key Personnel: E.J. Wexler Earthfx Incorporated delineated wellhead protection areas (WHPA) for all municipal wells within the Trent Conservation Coalition Drinking Water Source Protection Region. Included in this ...
Client: Grand River Conservation Authority (GRCA): 400 Clyde, Cambridge, ON Contact: Sonja Strynatka, P.Geo, Senior Hydrogeologist Key Personnel: Michael Takeda, Spencer Malott, E.J. Wexler The Brantford Airport wellfield, located 6 kilometers west of the Brantford town centre, services a small population of residential and industrial water users. A single well (Airport Well 1) ...
Client: Strada Aggregates Incorporated, 30 Floral Parkway, Concord, Ontario L4K 4R1. Contact: Mr. Grant C Horan (905-738-2200). Key Personnel: E.J. Wexler and Dirk Kassenaar Strada Aggregates operates a sand and gravel pit located northeast of the Village of Hillsburgh, ON. The Hillsburgh Pit license permits above-water-table extraction of sand and gravel from a 32.7 ha area and ...
Earthfx Incorporated developed a preliminary regional-scale groundwater model for the entire Grand River Conservation Authority area. The objective of the study was to better understand regional groundwater flow in the GRCA and evaluate the interaction between the river and the various aquifer systems in the basin. A key aspect of the study was the integration of multiple smaller-scale models ...
Client: Halton-Hamilton Source Protection Region, 4052 Milburough Line, RR#2, Campbellville, Ontario. Diane L. Bloomfield, M.Sc., P.Geo. (905.854.9229 ext. 223) Key Personnel: E.J. Wexler, D. Kassenaar The Region of Halton operates 3 municipal wellfields for the Town of Milton- the fastest growing community in Canada. The wells lie within a re-entrant (valley) cut into the Niagara Escarpment. ...
Client: Regional Municipality of York, Water and Wastewater Branch, Environmental Services: Mr. Don Goodyear P.Geo., Risk Management Official, (1.877.GO4.YORK ext. 5050) Key Personnel: D. Kassenaar and E.J. Wexler Under the 2006 Clean Water Act, watershed-based Source Water Protection studies are conducted to assess risks to municipal water supplies from a water quantity and water quality ...
Client: Central Lake Ontario Conservation Authority: Ms. Gail Soo Chan, P.Geo., Director – Groundwater Resources, 100 Whiting Avenue, Oshawa, ON L1H 3T3 (905-579-0411 x139) Key Personnel: E.J. Wexler The identification of significant groundwater recharge areas was a key element of recent Source Water Protection initiatives in Ontario. Under SWP, the term “significant ...
Client: Tom Guoth, GHD Ltd. (formerly Conestoga-Rovers & Associates) Ultimate Client: Regional Municipality of York Key Personnel: D. Kassenaar, E.J. Wexler, J. Ford, M. Takeda Earthfx developed a 3-dimensional groundwater flow model to analyze the impacts of construction dewatering for the Southeast Collector (SEC) Trunk Sewer on groundwater and stream baseflow. The work was done in support ...
Kudos to The Groundwater Project for their efforts developing free, high-quality groundwater educational material for all. They have just released another eBook (Geologic Frameworks for Groundwater Flow Models ) authored by J.P. Brandenburg which anyone who registers on their site can download for ...
The Getchell Main Pit (GMP) in Nevada hosts arsenic sulfide (AsxSy) mineralization (e.g., orpiment and realar) and ambient groundwater As up to 1.8 mg L-1 , making groundwater inflow a potentially significant As source to the future pit lake. Predictive simulations using MODFLOW-SURFACT show that the GMP lake water level will recover to within 99% of the pseudo-equilibrium stage ...
Examples of MINDEW solutions to relatively idealized problems are given and compared to those from physical models, analytical solutions, and another numerical code (MODFLOW). MINEDW has been applied to a large mining operation in Indonesia involving dewatering of both a large pit and underground drifts. ...
SPARROW models predict load (mass per time) for all stream reaches in a modeling reaches, and can also be modified to predict constituent yields, concentrations and source contributions to stream loads. MODFLOW MODLOW is considered an international standard for simulating and predicting groundwater conditions and interactions between groundwater and surface water. ...
SPARROW models predict load (mass per time) for all stream reaches in a modeling reaches, and can also be modified to predict constituent yields, concentrations and source contributions to stream loads. MODFLOW MODLOW is considered an international standard for simulating and predicting groundwater conditions and interactions between groundwater and surface water. ...
Water levels in the study aquifer were simulated using three-dimensional finite-difference groundwater model (MODFLOW 2000) with GMS 8.3 as pre- and postprocessing software. Input for groundwater recharge time series under the climate change scenarios were derived using a regression equation based on the cumulative deviation from mean rainfall using MATLAB. ...