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Index / Hydrogeology/Geology/Environmental/ / Field Methods and Procedures
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84 total  (26-50)   < 1 2 3 4 >

Index / Hydrogeology/Geology/Environmental/ / Field Methods and Procedures

GCAGS provides an organizational structure to participate in the business of the AAPG, and also provides for the discussion and publication of papers on subjects concerning the geological profession as it relates to Gulf Coast area geology.
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Index / Hydrogeology/Geology/Environmental/ / Field Methods and Procedures

The Section was established for the purpose of promoting the science of stratigraphy in the Gulf Coast states through research in paleontology and sedimentary petrology, especially as it relates to petroleum geology.
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Index / Hydrogeology/Geology/Environmental/ / Field Methods and Procedures

The Harris County Flood Control District Flood Warning System measures rainfall amounts and monitors water levels in bayous and major streams on a real-time basis to inform citizens of dangerous weather conditions. The system relies on 133 gauge stations strategically placed throughout Harris County bayous and their tributaries. The stations contain sensors that transmit valuable data during times of heavy rainfall and during tropical storms and hurricanes. Some gauges also measure wind speed and direction, barometric pressure, air temperature, road temperature and humidity.

The pur... More →
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Index / Hydrogeology/Geology/Environmental/ / Field Methods and Procedures

The HGCS District was created in 1975 by the 64 th Texas Legislature to regulate the withdrawal of ground water within Harris and Galveston Counties.

The U.S. Geological Surevey has been studying California subsidence for some time:

http://www.usgs.gov/newsroom/article.asp?ID=2300#.VreoJmgrIWf

Why not Texas with similar funding?
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Index / Hydrogeology/Geology/Environmental/ / Field Methods and Procedures

The Environment Agency in UK has announced guidance for indicative minimum reporting values for selected hazardous substances in clean water in the UK.

These values are to be used in conjunction with groundwater risk assessments involving hazardous substances in the United Kingdom. Guidance to such assessments is presented in...

https://www.gov.uk/guidance/groundwater-risk-assessment-for-your-environmental-permit
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Index / Hydrogeology/Geology/Environmental/ / Field Methods and Procedures

A report on a recent tour of the facility.
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Index / Hydrogeology/Geology/Environmental/ / Field Methods and Procedures

Operated by the University of Texas, the seismic station is of the state of the art design.
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Index / Hydrogeology/Geology/Environmental/ / Field Methods and Procedures

This Website is dedicated to supporting home owners with sinkholes. The first thing you're going to have to do if you're a victim is to understand that you are now confronted with a series of questions and tests and expenses you have probably never though
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Index / Hydrogeology/Geology/Environmental/ / Field Methods and Procedures

The IGS studies and reports on the general geology, environmental geology and geologic hazards, metallic and nonmetallic deposits, surface and ground water, and energy resources in the State of Idaho.
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Index / Hydrogeology/Geology/Environmental/ / Field Methods and Procedures

The Igarape Bahia Au-Cu-(REE-U) deposit is located in the Carajas Mineral Province - Northern Brazil - and hosted by an Archaean low-grade metamorphosed volcanosedimentary sequence characterized by metavolcanic rocks at the footwall and metavolcanoclastic/metasedimentary rocks at the hangwall. An intense hydrothermal alteration occurred in this sequence, promoting intense chloritization, Fe-metasomatism, Cu-sulphidation (chalcopyrite and bornite), carbonatization, silicification, tourmalinization and biotitization.

The Cu-Au mineralization is hosted in the contact between metavolcan... More →
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Index / Hydrogeology/Geology/Environmental/ / Field Methods and Procedures

Horizontal Drills personnel offers a quick review of horizontal and directional (remember the wells do not have to be horizontal or straight) well installation methodology. There are two types of horizontal well configurations. The first is a double-ended well, installed similar to a utility bore. They design their bore or well path, drill down to depth, across the screen section, then back up to the ground surface on the other end of the well. The screen and casing are pulled back to the rig in tension. Using this method, extremely long wells can be completed. The longest horizontal environme... More →
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Index / Hydrogeology/Geology/Environmental/ / Field Methods and Procedures

The International Association of Hydrogeologists (IAH) is an international scientific and educational organization that aims to promote research and understanding of the proper management and protection of groundwater for the common good throughout the world. IAH provides a valuable forum for scientists and engineers working in the fields of hydrogeology and groundwater resource planning, management, and protection who have a broad interest in and an international perspective on groundwater resources and hydrogeological issues. IAH is incorporated as a charitable organization in the United Kin... More →
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Index / Hydrogeology/Geology/Environmental/ / Field Methods and Procedures

Colin McDonald reports that the groundwater of the Edwards Aquifer is hypersensitive to whatever goes on above it (and around and below it). But it is also reflects subsurface Earth movements on the other side of the world. Less than 15 minutes after the earthquake in Japan, the water level at the J-17 well started to vibrate like a seismograph as the series of pressure waves radiated out from the earthquake site in Japan.

They have seen numerous earthquakes in J-17 including earthquakes in Chile, Sumatra, Haiti, Mexico, and Alaska, said Geary Schindel, chief technical officer at th... More →
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Index / Hydrogeology/Geology/Environmental/ / Field Methods and Procedures

B.L. Maheshwari and H.S. Grewal report that their study examines whether there are any beneficial effects of magnetic treatment of different irrigation water types on water productivity and yield of snow pea, celery and pea plants. Replicated pot experiments involving magnetically treated and non-magnetically treated potable water (tap water), recycled water and saline water (500 ppm and 1,000 ppm NaCl for snow peas, 1,500 ppm and 3,000 ppm for celery and peas) were conducted in glasshouse under controlled environmental conditions during April 2007 to December 2008 period at University of West... More →
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Index / Hydrogeology/Geology/Environmental/ / Field Methods and Procedures

Meeting the need for safe water supplies for U.S. communities in the 21st century will depend in large part upon groundwater. For instance, the U.S. public supply on a daily average pumps 15.7 billion gallons of groundwater, 20.7% of the national daily total of 76 billion gallons. The National Ground Water Association professional members are teaming to reach the 87.1 million Americans in 39,000 communities using an estimated 75,000 community wells to educate how five steps of well design, well development, water use calculation, pump selection, and operation and maintenance will enhance water... More →
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Index / Hydrogeology/Geology/Environmental/ / Field Methods and Procedures

The MDNR provides assistance, education & guidance in the use & protection of Missouri's natural resources; interprets the State's geological & hydrological setting; interprets the character & availability of its water, energy, & mineral resources, etc.
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Index / Hydrogeology/Geology/Environmental/ / Field Methods and Procedures

Weekly collection of earth imagery from NASA on natural hazards, tools for conservation, and monitoring earth conditions.
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Index / Hydrogeology/Geology/Environmental/ / Field Methods and Procedures

NASA's Earth Science Enterprise is composed of a series of polar-orbiting and low inclination satellites for long-term global observations of the land surface, biosphere, solid Earth, atmosphere, and oceans.
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Index / Hydrogeology/Geology/Environmental/ / Field Methods and Procedures

Athanasiadis, et al., report that wetting of bentonite is a complex hydro-mechanical process that involves swelling and, if confined, significant structural changes in its void structure. A coupled structural transport network model is proposed to investigate the effect of wetting of bentonite on retention conductivity and swelling pressure response.

The transport network of spheres and pipes, representing voids and throats, respectively, relies on Laplace-Young equation to model the wetting process. The structural network uses a simple elasto-plastic approach without hardening to ... More →
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Index / Hydrogeology/Geology/Environmental/ / Field Methods and Procedures

Stacy Liberatore reports that geoscientists at NASA Jet Propulsion Laboratory, UCLA and the Center for GeoInformatics at Louisiana State University, Baton Rouge, collaborated on the study, which covered the period from June 2009 to July 2012.

Other notable sinking was found in New Orleans Upper and Lower Ninth Ward in Metairie, where the measured ground movement could be related to water levels in the Mississippi. And an annual 1.6 inch drop was observed at Bonnet Carre Spillway east of Norco, which is the last line of protection against springtime river floods blowing over the leve... More →
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Index / Hydrogeology/Geology/Environmental/ / Field Methods and Procedures

June Mirecki reports that Scott Prinos (USGS Florida Water Science Center) has defined the saltwater interface in the Biscayne Aquifer (Quaternary karstic limestones) very precisely using induction logging methods. Induction logging is especially appropriate for use in a limestone, where the clay layers do not obscure the response to salt water.

See references:

Prinos, S.T., 2014, Using state-of-the-art technology to evaluate saltwater intrusion in the Biscayne aquifer of Miami-Dade County, Florida: U.S. Geological Survey Fact Sheet 2014 to 3050, 6 p.

Prinos,... More →
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Index / Hydrogeology/Geology/Environmental/ / Field Methods and Procedures

The historic pace of land subsidence in California Central Valley, the most productive U.S. agricultural region in the U.S., drives need for extensive infrastructure fixes. A canal that delivers vital water supplies from northern California to southern California is subsiding in places. So are stretches of a riverbed undergoing historic restoration. On farms, well casings appear like mushrooms as the ground around them subsides.

4 years of drought and heavy reliance on pumping of groundwater have made the land sink faster than ever up and down the Central Valley, requiring repairs t... More →
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Index / Hydrogeology/Geology/Environmental/ / Field Methods and Procedures

Perry-Castañeda Library Map Collection (UT Library) - Special Interest, General Interest, Maps on Other Web Sites... World Maps, Texas Maps, Historical Maps, City Maps...
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Index / Hydrogeology/Geology/Environmental/ / Field Methods and Procedures

The NGWA folks offer the private water well owner tip sheet. Disinfection and a well inspection are recommended when a well water tests positive for microorganisms such as bacteria, viruses, and protozoa (single-cell animals).

Wells are routinely tested for coliform bacteria or other organisms in soil or vegetation, and in the intestinal tract of warm-blooded animals. Most coliforms are harmless. Their presence indicates whether the well environment can support disease-causing bacteria.

Some strains of E. coli are disease causing, even lethal. If a well tests positive f... More →
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Index / Hydrogeology/Geology/Environmental/ / Field Methods and Procedures

PSSAT is a professional organization of soil scientists in Texas with the goals of promoting the proper use, management, and conservation of soil resources and advancing soil science within the State of Texas.
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