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Modflow Modeling Articles & Analysis
34 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
The Well Redundancy Problem Every groundwater monitoring network includes wells that cost money but provide no commensurate value. This statement reflects reality at contaminated sites worldwide, not a criticism of the hydrogeologists who designed these networks. Contamination plumes evolve over time, and our understanding of subsurface conditions improves as data accumulates. A well that ...
ByLiORA
The Global Contamination Challenge Over 2 million contaminated sites exist globally, and we continue polluting more sites than we clean up. This disparity between the problems we face and our ability to solve them through innovation creates what I call an ingenuity gap. The gap persists not because solutions do not exist, but because industry practices lag behind scientific advances by decades. ...
ByLiORA
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 ...
Earthfx tasks included surface water modelling, land development impact assessment, climate change, and groundwater model simulations of the watershed. A surface water model was developed using the WABAS model, which Earthfx converted and applied in a fully distributed form for this study. ...
Project work began with the extension and refinement of a model originally developed for the Oak Ridges Moraine. The model layers were expanded to include the main units of the Niagara Escarpment. The numerical groundwater flow model was built using the US Geological Survey MODFLOW code. A model grid was ...
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: 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 ...
Abstract: The proliferation of mine pits that intersect the groundwater table has engendered interest in environmental consequences of the lakes that form after cessation of dewatering. 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 ...
This paper analyzes the impacts of climate change and human pressures on Yazd-Ardakan aquifer using the Hadley Centre Coupled Model, version 3 (HADCM3) circulation Model and A2 emission scenario. Water levels in the study aquifer were simulated using three-dimensional finite-difference groundwater model (MODFLOW 2000) with ...
Here, MODFLOW was used to develop models with five different spatial discretization schemes: 10 × 10 m, 20 × 20 m, 30 × 30 m, 40 × 40 m and 50 × 50 m. ...
NO3− concentrations in shallow groundwater were assessed based on the applied urea dose (the common nitrogen fertilizer used) in year 2014. A groundwater modeling system (GMS) comprising MODFLOW and MT3D was used to simulate the three-dimensional groundwater flow and NO3− transportation processes in El-Menoufia Governorate, located in the central region of the ...
Nalenggele River is an inland river located in the arid, fragile ecological environment area in Northwestern China. Groundwater discharge to the river can significantly impact the ecologic environment in the Nalenggele River basin, but few hydrogeological studies have been conducted in the inland arid basin. In this paper, two sections were chosen to analyze the groundwater discharge in the ...
This study presents the first attempt to link the multi-algorithm genetically adaptive search method (AMALGAM) with a groundwater model to define pumping rates within a well distributed set of Pareto solutions. ...
Checking for data inconsistencies Loading 3,900 samples Loading 130,000 laboratory results Migrating stratigraphy data from the Modflow model to ArcGIS Migrating site data to ArcScene to prep the data in 3D Bringing boring and groundwater impact data for constituents of concern (COC) into Entervol for modeling in three dimensions Plotting ...
A Decision Support System (DSS) was set up based on WEAP, a software that represents the interaction between water resources and users by simulating flow mechanisms directly or coupled to external models. MODFLOW-2000, one of such models, was used to represent groundwater flow in the carbonatic and in the overlying quaternary aquifer, which is ...