MODFLOW-2005 and SWI2 models for assessing groundwater and surface-water interactions in the Heeia Watershed, Oahu, Hawaii

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, All tags... SWI2, USGS Science Data Catalog (SDC), Water Resources, environment, geoscientificInformation, groundwater, groundwater and surface-water interaction, groundwater discharge to ocean, groundwater flow, inlandWaters, saltwater intrusion, usgsgroundwatermodel, Fewer tags

MODFLOW-2005 and SWI2 models for assessing groundwater availability in volcanic aquifers on Kaua'i, O'ahu, and Maui, Hawai'i

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...

Tags: Groundwater, Groundwater Model, Groundwater discharge to ocean, Groundwater discharge to streams, Hawaiian Islands, All tags... InlandWaters, Kaua'i, MODFLOW-2005, Maui, NSDI, O'ahu, SWI2, Saltwater intrusion, USGS Science Data Catalog (SDC), environment, geoscientificInformation, inlandWaters, usgsgroundwatermodel, Fewer tags

MODFLOW-2005 and SWI2 models for assessing groundwater availability scenarios in volcanic aquifers on Kauai, Oahu, and Maui, Hawaii

Previously constructed steady-state numerical groundwater-flow models for the islands of Kauai, Oahu, and Maui, Hawaii (https://doi.org/10.3133/sir20205126) using MODFLOW-2005 with the Seawater Intrusion (SWI2) package, were used to examine the consequences of historical and plausible future withdrawals and changes in recharge. The volcanic aquifers of the Hawaiian Islands supply water to 1.46 million residents, diverse industries, and a large component of the U.S. military in the Pacific. Groundwater also supplies freshwater that supports ecosystems in streams and near the coast. Hawaii’s aquifers are remarkable given their small size, but the islands’ capacity to store fresh groundwater is limited because each...

Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Groundwater Model, Hawaiian Islands, Hydrology, Kauai, MODFLOW-2005, All tags... Maui, Oahu, SWI2, USGS Science Data Catalog (SDC), effects of climate change, environment, geoscientificInformation, groundwater, groundwater and surface-water interaction, groundwater discharge to ocean, groundwater flow, inlandWaters, saltwater intrusion, usgsgroundwatermodel, Fewer tags