Earth Tides and Cyclical Groundwater Level Fluctuations
Gravitational Effects on Groundwater Levels

(Part 1)

I recently reviewed some high-frequency groundwater level monitoring data from several wells and observation boreholes located within a few kilometres of the Indian Ocean that had been described in a report as demonstrating “tidal” influences. The term “tidal’ infers that groundwater levels are being influenced by ocean tides, which raises the possibility of deterioration in … Continued

Discover data management time-savers and automation with API at NGWA

Most users of environmental equipment face serious challenges with data management. Issues run the gamut: Some groups struggle to reliably import data into their visualization system of choice because manufacturers use different file formats that change periodically. Some wrestle with data that gets scattered across multiple devices and PCs over time. For some it can … Continued

5 Ways to Improve Your Next Aquifer Test Results

A thorough hydrogeologic site characterization is critical to the design of many engineering projects, from mine dewatering and groundwater treatment systems, to industrial water wells and aquifer storage projects. An aquifer test is a key component of the characterization process, yielding hydrologic data vital to system designs. When tasked with conducting an aquifer test, many … Continued

ORP Field Measurements Reporting Redox Potential (Eh) Correctly

Many practitioners are familiar with using multiparameter water quality meters in the field which incorporate ORP (oxygen-reduction potential) sensors. But ORP measurements are often reported from field probe measurements without the necessary conversion made to standardize readings to a common reference. Most manufacturers, including In-Situ, use a silver/silver chloride (Ag/AgCl) electrode in potassium chloride (KCl) … Continued

Big Data and Barometric Compensation

Is global barometric data accuracy good enough? I was recently sent some information of a research group working on the design of a low cost data logger system for measuring water levels. This is conceptualized as a total pressure logger, programmed and managed using smartphone technology.   Barometric Compensation To carry out compensation for barometric … Continued

Purge Volumes in Groundwater Sampling – Part 2

Differences Between Purge Volume Calculations In Peter Dumble’s blog (Part 1), he presented some notes on purge volume methods and indicated those which are supported by science and those which are included in guidance. In this blog, Dumble takes a hard look at the purge volume numbers and the differences between the methods and try to understand … Continued

Screen Volume and Low Flow Groundwater Sampling

Fully or Partially Purged – Does It Matter? When taking a groundwater sample from a well or borehole, understanding just where the water sample originates within the groundwater body is critical, particularly when contaminants are present. Research by Lindsay McMillan highlights significant uncertainties in the interpretation of water quality data not only in long screen … Continued

Optical DO Use in the State of New Jersey

OMGaretheyhappy Who? Just everyone who must do low-flow sampling in New Jersey, that’s all! Why? Well, before I tell you the great news New Jerseyans are celebrating, let’s all just take a moment to bask with them in their happiness. It’s ok for people in New Jersey to be happy, you know. They were the … Continued

How to Ace Your Next Aquifer Test

A thorough hydrogeologic site characterization is critical to the design of many engineering projects, from mine dewatering and groundwater treatment systems, to industrial water wells and aquifer storage projects. An aquifer test is a key component of the characterization process, yielding hydrologic data vital to system designs. When tasked with conducting an aquifer test, many … Continued

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