Download or read book Base flow Studies Pedernales River Texas written by Ernest T. Baker and published by . This book was released on 1964 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Base flow Studies Pedernales River Texas written by Pat H. Holland and published by . This book was released on 1964 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Characterizing Stream aquifer Interactions in the Pedernales Watershed in Central Texas written by Raddiete Ghion and published by . This book was released on 2017 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding the nature of stream-aquifer interaction is important for understanding the degree of hydraulic connection between streams and adjacent aquifers within any given watershed. Such information is necessary before the effects of groundwater pumping on streamflow, or the effects of surface-water runoff on aquifer recharge, can be assessed. Traditional techniques to analyze stream-aquifer interaction are based on digital groundwater flow models; however, aquifer parameters for model calibrations are generally unavailable or difficult and costly to obtain. Recession curve analysis is an alternative approach to determining stream-aquifer interaction Basic assumptions in recession curve analysis include: (1) no regulation on the stream, (2) stream fully penetrates the aquifer, (3) the watershed is underlined by impermeable rocks, (3) aquifer systems have uniform hydraulic conductivity and transmissivity, (4) aquifer that sustains stream flow is a one-dimensional flow regime (neglects vertical interaction with deeper aquifers), and (5) watershed has uniform storage and recharge. This study sought to investigate changes in precipitation, streamflow, baseflow, and hydrologic properties of the Pedernales watershed in central Texas, as well as identify the primary aquifer contributing flow to the Pedernales River between 1940 and 2014. The USGS Ground Water Tool Box RECESS program was used to extract meaningful segments of streamflow recession and the slope (K) of such segments (recession curve index, RCI). Man-Kendall Monotonic trend (MK) tests were used to assess changes in climatologic and hydrologic conditions during the study period. The results of annual trend analysis of precipitation, streamflow, baseflow and RCI showed no significant changes over the study period. Values of the stream-aquifer property T/a2S (where T is the transmissivity of the aquifer, a is the average distance between the stream and watershed divide, and S is the storativity of the aquifer was estimated as 0.0403/d and the watershed K value was 23.15 days/log cycle. It is concluded that the Hensel Sand (rock formation) of Cretaceous age is the primary source of baseflow to the Pedernales River above the Johnson City gage. Results of this study are relevant to water resource management in the study area to satisfy the needs o fa growing population while maintaining the ecological integrity of the stream-aquifer system. The approach used in this study is transferable to other watersheds as method requires only streamflow hydrograph and recession analysis.
Download or read book Water Resources Data for Texas written by and published by . This book was released on 1964 with total page 530 pages. Available in PDF, EPUB and Kindle. Book excerpt: CONTENTS: v. 1. Arkansas River Basin, Red River Basin, Sabine River Basin, Neches River Basin, Trinity River Basin, and intervening coastal basins -- v. 2. San Jacinto River Basin, Brazos River Basin, San Bernard River Basin and intervening coastal basins -- v. 3. Colorado River Basin, Lavaca River Basin, Guadalupe River Basin, Nueces River Basin, Rio Grande Basin, and intervening coastal basins.
Download or read book Water Resources Data for Texas written by Geological Survey (U.S.). Water Resources Division and published by . This book was released on 1967 with total page 852 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Science of Instream Flows written by National Research Council and published by National Academies Press. This book was released on 2005-03-18 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: Across the United States, municipalities, counties, and states grapple with issues of ensuring adequate amounts of water in times of high demand and low supply. Instream flow programs aim to balance ecosystem requirements and human uses of water, and try to determine how much water should be in rivers. With its range of river and ecosystem conditions, growing population, and high demands on water, Texas is representative of instream flow challenges across the United States, and its instream flow program may be a model for other jurisdictions. Three state agenciesâ€"the Texas Water Development Board (TWDB), the Texas Parks and Wildlife Department (TPWD), and the Texas Commission on Environmental Quality (TCEQ)â€"asked a committee of the National Research Council (NRC) to review the Programmatic Work Plan (PWP) and Technical Overview Document (TOD) that outline the state's instream flow initiative. The committee suggested several changes to the proposed plan, such as establishing clearer goals, modifying the flow chart that outlines the necessary steps for conducting an instream flow study, and provide better linkages between individual studies of biology, hydrology and hydraulics, physical processes, and water quality.
Download or read book Water resources Investigations written by and published by . This book was released on 1975 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geochemical Clues to Groundwater Sources of the Pedernales River Texas written by Sarah Jo Zappitello and published by . This book was released on 2016 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: Interactions between aquifers and rivers are recognized as important components of the hydrologic system. Central Texas rivers and aquifers are especially well connected due to karstic carbonate geology where gaining and losing streams, springs, and caves are common. The Pedernales River is an important source of water for local communities, the city of Austin, and downstream water users of the Colorado River, to which it drains. The Pedernales River Basin is surrounded by rapidly developing areas with increasing water demands, but the majority of the watershed is developed only for agriculture. Identifying critical areas for water quality and quantity protection while the land is still relatively undeveloped creates an opportunity for proactive water resource protection. The primary objectives of this study were: 1) to compare water quality and geochemistry of water from the Pedernales River, its tributaries, springs across the basin, wells screened in specific aquifers, and historic data; 2) to identify groundwater sources of the river; and 3) to assess whether or not changes in water quality have occurred in the Pedernales River between 1962 and 2015. By conducting this study during baseflow conditions, the water sources are assumed to originate exclusively from groundwater, as opposed to runoff or soil interflow. Geospatial information was evaluated for springs, surface geology, and river gains and losses. Stable isotope ratios, principal component analysis, and spatial analysis highlight the importance of groundwater contributions and human impacts to the river and indicate that evaporation is controlling the geochemical evolution of surface waters. Water quality throughout the watershed was generally good. Hydrogen and oxygen stable isotope ratios for spring and well samples defined a regional groundwater signature, and tributary and main river samples plotted along an evaporative trend with the groundwater signature as the source. Principal component analysis identified two groups of variables which strongly represent variation in sample geochemistry: humanly impacted variables and groundwater signature variables. Spatial analysis also revealed patterns of human impacts and groundwater inputs. The groundwater source locations were combined with surface geology to identify host geologic unit, and therefore source aquifers, of groundwater in the river basin. Groundwater in the Pedernales River is derived from the Edwards-Trinity Plateau Aquifer, the Trinity Aquifer, the Marble Falls Aquifer, and the Ellenburger-San Saba Aquifer.
Download or read book Geological Survey Professional Paper written by and published by . This book was released on 1964 with total page 1024 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geological Survey Water supply Paper written by and published by . This book was released on 1968 with total page 594 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book U S Geological Survey Professional Paper written by and published by . This book was released on 1964 with total page 1018 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bibliography of United States Geological Survey Reports on the Geology and Water Resources of Texas 1887 1974 written by and published by . This book was released on 1975 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geological Survey Bulletin written by and published by . This book was released on 1966 with total page 972 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Base Flow Geohydrology in the Pecos River Between Acme and Artesia New Mexico written by Texas. Department of Water Resources. Data Collection and Evaluation Section and published by . This book was released on 1978 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Science of Instream Flows written by Committee on Review of Methods for Establishing Instream Flows for Texas Rivers and published by . This book was released on 2005-03-18 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: Across the United States, municipalities, counties, and states grapple with issues of ensuring adequate amounts of water in times of high demand and low supply. Instream flow programs aim to balance ecosystem requirements and human uses of water, and try to determine how much water should be in rivers. With its range of river and ecosystem conditions, growing population, and high demands on water, Texas is representative of instream flow challenges across the United States, and its instream flow program may be a model for other jurisdictions. Three state agenciesa "the Texas Water Development Board (TWDB), the Texas Parks and Wildlife Department (TPWD), and the Texas Commission on Environmental Quality (TCEQ)a "asked a committee of the National Research Council (NRC) to review the Programmatic Work Plan (PWP) and Technical Overview Document (TOD) that outline the statea s instream flow initiative. The committee suggested several changes to the proposed plan, such as establishing clearer goals, modifying the flow chart that outlines the necessary steps for conducting an instream flow study, and provide better linkages between individual studies of biology, hydrology and hydraulics, physical processes, and water quality."
Download or read book Report written by Texas Water Commission and published by . This book was released on 1962 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Summary of Investigations written by and published by . This book was released on 1963 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: A summary of recent scientific and economic results, accompanied by a list of publications released in fiscal 1963, a list of geologic and hydrologic investigations in progress, and a report on the status of topographic mapping.
