Scot K Izuka
Scot Izuka is a hydrologist with the Pacific Islands Water Science Center in Honolulu, Hawaiʻi.
Scot Izuka has been a hydrologist with the USGS Pacific Islands Water Science Center since 1989 and has conducted water-resources studies in Hawai‘i, American Samoa, and Micronesia. Most of his work is in island groundwater and surface-water hydrology, but he also has published research in geomorphology, climate, sedimentology, stratigraphy, geochemistry, geochronology, paleontology, and paleogeography. Scot is currently the project lead for the Hawai‘i Volcanic Aquifer Study, one of several regional groundwater-availability assessments being conducted by the USGS Water Availability and Use Science Program.
Education
PhD, Geology and Geophysics, University of Hawai‘i at Mānoa, 1988
MS, Geology, University of Kansas, 1983
BS, Geology and Geophysics, University of Hawai‘i at Mānoa, 1981
Professional Experience
Hydrologist, USGS Pacific Islands Water Science Center, Honolulu, Hawai‘i, 1989–present
Affiliate Graduate Faculty, Geology and Geophysics, University of Hawai‘i at Mānoa, 2017–present
Lecturer, Department of Math and Science, Kapi‘olani Community College, University of Hawai‘i, 1988–1991
Science and Products
Sources of suspended sediment in the Waikele watershed, Oʻahu, Hawaiʻi
Potential effects of roadside dry wells on groundwater quality on the Island of Hawai'i — Assessment using numerical groundwater models
Streamflow, suspended-sediment, and soil-erosion data from Kaulana and Hakioawa watersheds, Kaho'olawe, Hawai'i, 2006 to 2010
Reconnaissance Assessment of the Potential for Roadside Dry Wells to Affect Water Quality on the Island of Hawai'i
Areas Contributing Recharge to Wells in the Tafuna-Leone Plain, Tutuila, American Samoa
Effects of Irrigation, Drought, and Ground-Water Withdrawals on Ground-Water Levels in the Southern Lihue Basin, Kauai, Hawaii
Construction, Geology, and Aquifer Testing of the Maalo Road, Aahoaka Hill, and Upper Eleele Tank Monitor Wells, Kauai, Hawaii
Reconnaissance of the Hydrogeology of Ta'u, American Samoa
Effects of irrigation and rainfall reduction on ground-water recharge in the Lihue basin, Kauai, Hawaii
Numerical Simulation of Ground-Water Withdrawals in the Southern Lihue Basin, Kauai, Hawaii
Summary of ground-water data for Tutuila and Aunuu, American Samoa, for October 1987 through September 1997
Ground Water in the Southern Lihue Basin, Kauai, Hawaii
Science and Products
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Filter Total Items: 27
Sources of suspended sediment in the Waikele watershed, Oʻahu, Hawaiʻi
Data from streamflow/sediment gages and measurements of changes in channel-bed sediment storage were gathered between October 1, 2007, and September 30, 2010, to assess the sources of suspended sediment in the Waikele watershed, Oʻahu, Hawaiʻi. Streamflow from the watershed averaged 33 cubic feet per second during the study period, with interannual variations corresponding with variations in the fAuthorsScot K. IzukaPotential effects of roadside dry wells on groundwater quality on the Island of Hawai'i — Assessment using numerical groundwater models
Widespread use of dry wells to dispose of roadside runoff has raised concern about the potential effects on the quality of groundwater on the Island of Hawai‘i. This study used semi-generic numerical models of groundwater flow and contaminant transport to assess the potential effect of dry wells on groundwater quality on the Island of Hawai‘i. The semi-generic models are generalized numerical grouAuthorsScot K. IzukaStreamflow, suspended-sediment, and soil-erosion data from Kaulana and Hakioawa watersheds, Kaho'olawe, Hawai'i, 2006 to 2010
Various events over the last two centuries have destroyed the vegetation and caused rapid soil erosion on large areas of the small, arid, windy tropical shield-volcano island of Kaho`olawe, Hawai`i. These activities were largely halted in the 1990s, and efforts have been made to restore the island's vegetation in order to stem erosion. In 2003, the Kaho`olawe Island Reserve Commission (KIRC) beganAuthorsScot K. Izuka, Lyman L. AbbottReconnaissance Assessment of the Potential for Roadside Dry Wells to Affect Water Quality on the Island of Hawai'i
The County of Hawai'i Department of Public Works (DPW) uses dry wells to dispose of stormwater runoff from roads. Recently, concern has been raised that water entering the dry wells may transport contaminants to groundwater and affect the quality of receiving waters. The DPW operates 2,052 dry wells. Compiling an inventory of these dry wells and sorting it on the basis of presence or absence of urAuthorsScot K. Izuka, Craig A. Senter, Adam G. JohnsonAreas Contributing Recharge to Wells in the Tafuna-Leone Plain, Tutuila, American Samoa
To address the concerns about the potential for contamination of drinking-water wells in the Tafuna-Leone Plain, Tutuila, American Samoa, a numerical ground-water flow model was developed and used to delineate areas contributing recharge to the wells (ACRWs). Surveys and analyses were conducted to obtain or compile certain essential hydrogeologic information needed for the model, such as groundwatAuthorsScot K. Izuka, John M. Perreault, Todd K. PresleyEffects of Irrigation, Drought, and Ground-Water Withdrawals on Ground-Water Levels in the Southern Lihue Basin, Kauai, Hawaii
A numerical ground-water-flow model was used to investigate the effects of irrigation on ground-water levels in the southern Lihue Basin, Kauai, Hawaii, and the relation between declining ground-water levels observed in the basin in the 1990s and early 2000s and concurrent drought, irrigation reduction, and changes in ground-water withdrawal. Results of steady-state model simulations indicate thatAuthorsScot K. IzukaConstruction, Geology, and Aquifer Testing of the Maalo Road, Aahoaka Hill, and Upper Eleele Tank Monitor Wells, Kauai, Hawaii
The Maalo Road, Aahoaka Hill, and Upper Eleele Tank monitor wells were constructed using rotary drilling methods between July 1998 and August 2002 as part of a program of exploratory drilling, aquifer testing, and hydrologic analysis on Kauai. Aquifer tests were conducted in the uncased boreholes of the wells. The Maalo Road monitor well in the Lihue Basin penetrated 915 feet, mostly through maAuthorsScot K. IzukaReconnaissance of the Hydrogeology of Ta'u, American Samoa
Analysis of existing data and information collected on a reconnaissance field visit supports a conceptual model of ground-water occurrence in Ta'u, American Samoa, in which a thin freshwater lens exists in a predominantly high-permeability aquifer that receives high rates of recharge. Because the freshwater lens is thin throughout most of the island, the productivity of wells, especially those neaAuthorsScot K. IzukaEffects of irrigation and rainfall reduction on ground-water recharge in the Lihue basin, Kauai, Hawaii
No abstract available.AuthorsScot K. Izuka, Delwyn S. Oki, Chien-Hwa ChenNumerical Simulation of Ground-Water Withdrawals in the Southern Lihue Basin, Kauai, Hawaii
Numerical simulations indicate that ground-water withdrawals from the Hanamaulu and Puhi areas of the southern Lihue Basin will result in a decline in water levels and reductions in base flows of streams near proposed new water-supply wells. Most of the changes will be attained within 10 to 20 years of the start of pumping. Except for areas such as Puhi and Kilohana, the freshwater lens in most inAuthorsScot K. Izuka, Delwyn S. OkiSummary of ground-water data for Tutuila and Aunuu, American Samoa, for October 1987 through September 1997
Ground-water and rainfall data for the period October 1987 through September 1997 from Tutuila and Aunuu, American Samoa, are plotted in time-series graphs and summarized. The data include pumpage and chloride concentrations from 53 production wells on Tutuila, including 5 new wells that were put into production between October 1996 and September 1997, 3 production wells on Aunuu, water-level measAuthorsScot K. IzukaGround Water in the Southern Lihue Basin, Kauai, Hawaii
A multi-phased study of ground-water resources, including well drilling, aquifer tests, analysis of ground-water discharge, and numerical ground-water modeling, indicates that the rocks of the southern Lihue Basin, Kauai, have permeabilities that are much lower than in most other areas of ground-water development in the Hawaiian islands. The regional hydraulic conductivity of the Koloa Volcanics,AuthorsScot K. Izuka, Stephen B. Gingerich