The Geology of the Central Virgin River Basin, Southwestern Utah, and Its Relation to Ground-water Conditions

The Geology of the Central Virgin River Basin, Southwestern Utah, and Its Relation to Ground-water Conditions PDF

Author: Hugh A. Hurlow

Publisher: Utah Geological Survey

Published: 1998-01-01

Total Pages: 65

ISBN-13: 1557916144

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This report describes the geology of the central Virgin River basin in southwestern Utah, and characterizes the structure and lithology of the Jurassic Navajo Sandstone and the thickness and stratigraphy of Quaternary-late Tertiary unconsolidated deposits, the two main aquifers in the region. Southwestern Utah has experienced rapid population growth and increased demand on water supplies during the past 15 years, and the purpose of this report is to better define the ground-water resources of the area. Ground water provides approximately half of the public water supply in southwestern Utah, so future decisions regarding water use must be based on careful geologic characterization of the aquifers and their relation to the regional hydrologic system. The results of this study will be applied to ground-water modeling, evaluating regional and local hydrogeologic conditions, and assessing sites for development of ground water. 53 pages + 7 plates

Regional groundwater flow and water quality in the Virgin River Basin and surrounding areas, Utah and Arizona

Regional groundwater flow and water quality in the Virgin River Basin and surrounding areas, Utah and Arizona PDF

Author: Paul Inkenbrandt

Publisher: Utah Geological Survey

Published: 2013-12-17

Total Pages: 58

ISBN-13: 155791883X

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In this 46-page report, we characterized the deep aquifer system and its connections to the overlying aquifers in the area of the Hurricane fault in Washington County by examining well logs, creating regional potentiometric-surface maps, compiling groundwater quality data, conducting gravity surveys, examining remote sensing data for surface lineaments, and determining areas for potential monitoring wells. Results of the study were: (1) R and C aquifer groundwater depths are > 500 feet in the I-15 corridor area, (2) a groundwater divide likely exists south of the Utah-Arizona state line, (3) groundwater flow follows open fracture systems, (4) fracture conductivity is highest near the fault, (5) dissolution of evaporites increase groundwater TDS, and (6) a well should be drilled into the Hurricane fault near Pintura.

Ground-water Sensitivity and Vulnerability to Pesticides, Central Virgin River Basin, Washington and Iron Counties, Utah

Ground-water Sensitivity and Vulnerability to Pesticides, Central Virgin River Basin, Washington and Iron Counties, Utah PDF

Author: Mike Lowe

Publisher: Utah Geological Survey

Published: 2006-09

Total Pages: 29

ISBN-13: 1557917566

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The U.S. Environmental Protection Agency has recommended that states develop Pesticide Management Plans for four agricultural chemicals - alachlor, atrazine, metolachlor, and simazine - used in Utah as herbicides in the production of corn and sorghum, and to control weeds and undesired vegetation (such as along right-of-ways or utility substations). This report and accompanying maps are intended to be used as part of these Pesticide Management Plans to provide local, state, and federal government agencies and agricultural pesticide users with a base of information concerning sensitivity and vulnerability of ground water in the basin-fill aquifer (bedrock is not evaluated) to agricultural pesticides in the central Virgin River basin, Washington and Iron Counties, Utah. We used existing data to produce pesticide sensitivity and vulnerability maps by applying an attribute ranking system specifically tailored to the western United States using Geographic Information System analysis methods. 24 pages + 2 plates

The Hydrogeology of Moab-Spanish Valley, Grand and San Juan Counties, Utah, with Emphasis on Maps for Water-resource Management and Land-use Planning

The Hydrogeology of Moab-Spanish Valley, Grand and San Juan Counties, Utah, with Emphasis on Maps for Water-resource Management and Land-use Planning PDF

Author: Mike Lowe

Publisher: Utah Geological Survey

Published: 2007-01-22

Total Pages: 129

ISBN-13: 1557917647

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The purpose of this study is to provide tools for water-resource management and land-use planning; to accomplish this purpose we (1) characterize the relationship of geology to ground-water conditions in the Glen Canyon and the unconsolidated valley-fill aquifers, (2) classify the groundwater quality of the Glen Canyon (east of the valley only) and valley-fill aquifers to formally identify and document the beneficial use of ground-water resources, and (3) apply a ground-water flow model using a mass balance approach to determine the potential impact of projected increased numbers of septic-tank systems on water quality in the valley-fill aquifer and thereby recommend appropriate septic-system density requirements to limit water-quality degradation

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