Filters: Tags: MODFLOW-2005 (X)
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A numerical groundwater flow model using MODFLOW-2005 was developed to examine predevelopment groundwater flow in eastern Abu Dhabi Emirate, United Arab Emirates. The model was calibrated to conditions before the 1960s, the period before modern pumping began. The model was used to evaluate the regional water budget and 4 potential recharge scenarios. This USGS data release contains all of the input and output files for the simulations described in the associated model documentation report (https://doi.org/10.3133/sir20185158). This data release also includes input and output data files for sensitivity and scenarios simulations, and MODFLOW-2015 source code.
An existing three-dimensional groundwater flow model of northern Utah County (https://doi.org/10.3133/sir20095049), was updated for use with the Groundwater Management Process(GWM) for MODFLOW-2005, to evaluate the optimal managed aquifer recharge scenarios with the objective of maintaining acceptable reductions in simulated discharge at 12 groundwater discharge areas along Utah Lake. Groundwater is a primary source of drinking water in northern Utah County. By 2066, the amount of groundwater withdrawn is estimated to be roughly 65 percent of annual average recharge. To prepare for anticipated future increases in groundwater withdrawals, local cities have identified 16 locations as feasible for managed aquifer recharge....
A three-dimensional, groundwater-flow model developed by Halford and Jackson (https://doi.org/10.3133/pp1863) was used to simulate effects of future (2020—2120) groundwater pumping on water levels and natural discharges in the Alkali Flat–Furnace Creek Ranch (AFFCR), Ash Meadows, Pahute Mesa–Oasis Valley (PMOV), and Pahrump to Death Valley South (PDVS) groundwater basins, southern Nevada and California. Four pumping scenarios were simulated, including a base case and scenarios A, B, and C. Scenarios were simulated from 1913 to 2120, with historical pumping occurring from 1913 to 2010, historical 2010 pumping rates projected from 2010 to 2020, and scenario pumping beginning in 2020. The base case projected 2010 pumping...
Situated in a remote corner of northwestern New Mexico, Chaco Culture National Historical Park (CCNHP) was once the center of a sophisticated social, political and architectural civilization with a 50,000-square mile sphere of influence. The park protects the greatest concentration of Chacoan historical sites in the American Southwest and is arguably the most significant prehistoric site in North America. Following decades of unsuccessful attempts to develop usable near-surface water sources, the National Park Service constructed a 3,100-foot deep well into the Gallup Sandstone aquifer in 1972, providing the park with the first reliable drinking water source since it was established in 1907. The ~100-foot thick...
Resource managers and users seek information that can be used to balance the needs of competing uses of groundwater and streamflow in the Heeia watershed, Oahu. A previously constructed steady-state numerical groundwater-flow model for the island of Oahu, Hawaii (https://doi.org/10.3133/sir20205126) using MODFLOW-2005 with the Seawater Intrusion (SWI2) package was used to examine the effects of withdrawals in the watershed. Four simulations representing a baseline and various withdrawal conditions were run using the previously published numerical model. The baseline simulation represents conditions in 2001-10 which were used to calibrate the Oahu model and to which all other scenarios are compared. The three scenarios...
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Groundwater Model,
Hawaiian Islands,
Hydrology,
MODFLOW-2005,
Oahu,
The U.S. Geological Survey, in cooperation with the U.S. Environmental Protection Agency and the New Hampshire Department of Environmental Services, developed a model for used with MODFLOW-2005 and MODPATH5 to evaluate groundwater flow and advective transport under pre- and post-remediation conditions in the crystalline-rock aquifer in the vicinity of the Savage Municipal Water-Supply Well Superfund site Milford, New Hampshire. In addition, a previously developed model (https://doi.org/10.3133/sir20045176 and https://doi.org/10.3133/ofr20121079) was used with MOC3D to evaluate the solute-transport of tetrachloroethylene (PCE). In 2010 PCE, a chlorinated volatile organic compound, was detected in groundwater from...
A sequence of nine two-dimensional cross-sectional groundwater models using MODFLOW-2005 was created to study whether underpressures (subhydrostatic heads) in the Paleozoic units underlying the Great Plains of North America are a consequence of Cenozoic uplift of the area. Based on tectonostratigraphic data incorporated into these nine models, we have developed a cumulative uplift history with superimposed periods of deposition and erosion for the Great Plains for the period from 40Ma to the present. Uplift, deposition, and erosion on an 800 kilometer long geologic cross-section extending from northeast Colorado to eastern Kansas is represented in these nine time-stepped geohydrologic models. Sequential solution...
The Los Angeles Coastal Plain (LACP) covers about 580 square miles and is the largest coastal plain of semiarid southern California. The LACP is heavily developed with mostly residential, commercial, and industrial land uses that rely heavily on groundwater for water supply. In 2010, the LACP was home to about 14 percent of California’s population and is also a major commercial and industrial hub. There has been a heavy reliance on groundwater from the LACP for many years. Managed aquifer recharge from the spreading grounds and barrier wells is now a substantial component of the LACP’s groundwater supply. The U.S. Geological Survey (USGS) conducted a study in cooperation with the Water Replenishment District of...
A regional groundwater-flow model and particle-tracking program were used to delineate areas contributing groundwater to coastal and freshwater bodies and to estimate travel times from the water table to saline water bodies under average conditions from 1968 to 1983 on Long Island, New York. The coastal waters of Long Island are important economic and recreational resources for the region. The coastal water bodies receive freshwater from inflow of both surface water and groundwater, in addition to tidal exchanges of saltwater. Excessive nitrogen inputs associated with development and urbanization in the freshwater recharge areas to coastal water bodies can adversely affect marine and estuarine ecosystems. The results...
The U.S. Geological Survey (USGS), in cooperation with the Air Force Civil Engineering Center, created a numerical groundwater-flow model for the Fountain Creek alluvial aquifer using the finite-difference MODFLOW code with the Newton formulation solver. This numerical groundwater-flow model simulates water-budget components, groundwater-flow directions, and groundwater-flow paths of the Fountain Creek alluvial aquifer. The numerical model was spatially discretized into a single layer with 291 rows and 254 columns of 200 by 200 feet size, and a total of 17,610 active cell. The numerical model was temporally discretized into 1 initial steady-state stress period representing the average conditions of the 240 monthly...
A three-dimensional, groundwater model (MODFLOW-2005) was developed to determine effects of future (2019–2100) groundwater development on water levels and natural discharges in the Alkali Flat–Furnace Creek Ranch (AFFCR), Ash Meadows, Pahute Mesa–Oasis Valley (PMOV), and Pahrump to Death Valley South (PDVS) groundwater basins, southern Nevada and California. Two pumping scenarios were developed. Scenario 1 assumed pumping continues at the current (2018) rate through 2100. Scenario 2 assumed all pumping stops in 2018 so that recovery can be observed from 2019–2100. Input and output files for the predictive simulations are in the model and output directories, respectively. The predictive model was calibrated with...
A third revision of the New Jersey Coastal Plain (NJCP) groundwater flow model, using MODFLOW-2005 (version 1.12.00), was completed to maintain the model’s usefulness for water-resource managment and development. The regional groundwater-flow model was initially developed for the U.S. Geological Survey (USGS) Regional Aquifer System Analysis (RASA) program. Periodic revision of the model is required as the result of changing hydrologic stresses, different and more complex water management needs, and increased knowledge of hydrologic conditions. The RASA model was initially constructed in the 1980’s as a quasi-3D model with 10 aquifers. The 9 intervening confining units were simulated using vertical leakage parameters...
The U.S. Geological Survey, in cooperation with the U.S. Department of the Navy, developed several 3-D groundwater flow models for used with MODFLOW-2005, MODFLOW-NWT, and SEAWAT model codes to evaluate variable-density groundwater flow and contaminant transport in Operable Unit 1 on Naval Base Kitsap in Keyport, Washington. Chlorinated volatile organic compounds (CVOCs) have migrated to groundwater beneath a former 9-acre landfill at Operable Unit 1 (OU-1). The three predominant ground-water contaminants are the chloroethene compounds trichloroethene (TCE), cis-1,2-dichloroethene (cis-DCE), and vinyl chloride (VC). A need for remedial action was identified because some of the contaminants present a potential risk...
A three-dimension groundwater-flow model (MODFLOW-2005) was developed to improve understanding of groundwater flow and pumping effects near the Long Canyon Mine in Goshute Valley, northeastern Nevada. Bulk hydraulic properties of carbonate rocks and basin-fill aquifers were characterized by simultaneously interpreting steady-state flow during predevelopment conditions and changes in groundwater levels and spring flows from the 2016 multiple-well aquifer test with an integrated groundwater-flow model. This USGS data release contains all of the input and output files for the simulations described in the associated model documentation report (https://doi.org/10.3133/sir20215021).
A three-dimensional, groundwater-flow model (MODFLOW-2005) was developed to estimate the hydraulic properties (e.g., transmissivity, hydraulic conductivity, specific yield, and specific storage) of volcanic rocks in Pahute Mesa, Nye County, Nevada. The model was calibrated using parameter estimation (PEST) by fitting estimated drawdowns to simulated drawdowns from 16 multiple-well aquifer tests. Water-level models were used to estimate drawdowns from continuous water-level data collected during multiple-well aquifer testing. This USGS data release contains all of the input and output files for the simulations described in the associated model documentation report (http://doi.org/10.3133/sir20165151). This data release...
Steady-state numerical groundwater-flow models were constructed for the islands of Kaua'i, O'ahu, and Maui, Hawai'i. Separate models were created for each island using MODFLOW-2005 (Harbaugh, 2005) with the Seawater Intrusion (SWI2) package (Bakker and others, 2013), which allows simulation of freshwater and saltwater in ocean-island aquifers. The purpose of the models is to enable quantification of the hydrologic effects of withdrawals and changes in climate. These effects include water-table depression, saltwater rise, and reduction of natural groundwater discharge to streams, springs, and the ocean. The effects can place limits on groundwater availability. This USGS data release contains all of the input and...
This data release documents a modified version of the Death Valley version 3 steady-state (DV3-SS) model described in U.S. Geological Survey Professional Paper 1863 (https://doi.org/10.3133/pp1863). The DV3-SS model was modified by conversion into a superposition model with initial heads of 0 ft (0 m). Simulated water-level changes are relative to modern, predevelopment (pre-1950) conditions, where modern levels have a reference datum of 0 ft (0 m). The modified DV3-SS model is a three-dimensional, groundwater model (MODFLOW-2005) that was used to estimate paleo-recharge in the Ash Meadows groundwater basin, southwest Nevada, using the Devils Hole (cave 2) water-table record that spans the last 350,000 years. Two...
Two transient surface-water/groundwater models were developed to study the potential for increased inundation and flooding in eastern Broward County due to changes in future climate and sea-level rise. These models were constructed by using a modified version of MODFLOW 2005, with the surface-water system represented by using the surface-water routing process (SWR1) and a new Urban Runoff (URO) process. The models were used to simulate an historical period (1990-99) using measured input data and a base-case (1990–99) and a future period (2060–69) using regional climate model rainfall and potential evapotranspiration output. Model construction relied heavily on a previously created variable density model of the same...
The U.S. Geological Survey, in cooperation with the Town of Barnstable, Massachusetts, modified an existing numerical, steady-state regional MODFLOW-2005 groundwater-flow model to evaluate changes in water levels from a reference condition (2015) for nine pumping and wastewater return flow scenarios prepared by the Hyannis Water System. The three-dimensional, steady-state groundwater-flow model used to simulate water level changes is a modified and recalibrated version of an existing model that was used to simulate the potential effects of sea-level rise on groundwater levels of the Sagamore and Monomoy freshwater lenses of the Cape Cod aquifer (Walter and others, 2016) (https://doi.org/10.3133/sir20165058). Two...
This groundwater-flow model archive/data release contains the model input and output files for 1) edited versions of four of the five NAWQA steady- state, inset MODFLOW-NWT models of regional model of Lake Michigan Basin (https://doi.org/10.3133/sir20185038) and 2) general models simulating the same four basins as the four inset models. Two HUC8 basins in the lower peninsula of Michigan (Kalamazoo (KALA) and Boardman-Charlevoix (BOARD) basins) and two HUC8 basins in Wisconsin (Upper Fox (UFOX) and Manitowoc-Sheboygan (MANI) basins) are represented in the inset and genera-simulation models. The inset models are designed to serve as a training area for metamodels to estimate groundwater age in glacial wells. The construction...
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