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

In-Situ and EarthSoft Collaborate to Offer Software Integration for Real-Time Field Data Collection and Management

Contact: Helen Taylor,, (970) 556-3994 FORT COLLINS, Colo., November 13, 2018 — In-Situ and EarthSoft are pleased to announce their latest collaboration. By pairing EarthSoft’s EQuIS™ Collect and EDGE software with In-Situ’s instruments and the HydroVu™ API, the companies will deliver unprecedented integrated data management capabilities. EarthSoft and In-Situ developers collaborated to integrate and … Continued

New Patented Fluorometer Technology Improves Detection of Harmful Algal Blooms and Tracer Studies

In-Situ has announced a new line of fluorometers compatible with the company’s popular Aqua TROLL 500 and Aqua TROLL 600 Multiparameter Sondes. The line includes: Rhodamine WT, Chlorophyll a, Phycocyanin (BGA-PC), and Phycoerythrin (BGA-PE) sensors, ideal for lake and river monitoring as well as coastal studies. The sensors will be the latest addition to the … 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

How Much to Purge?

A modeling approach to purge volume guesstimation A novel approach to determine an optimum groundwater purging and sampling strategy was published last year in the Journal of Hydrology (Qi et al, 2017). This paper uses a numerical model to estimate the “representativeness” of the groundwater sample at different purge times. The model was tested against … 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

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