Aquifer Testing

Understanding groundwater aquifer parameters (hydraulic conductivity, transmisivity and storativity for example) is important in site dewatering evaluation. It is beneficial to both Engineers and contractors to have a good understanding about the hydrogeology of a site before designing and constructing a dewatering system. The characteristics of the aquifer confirm if the assumptions included in the dewatering system design meet the project criteria.

Griffin has extensive experience conducting aquifer tests including:

  • Constant-Rate Pumping Tests
  • Variable-Rate Tests
  • Recovery Tests
  • Step-Drawdown Tests
  • Multiple Pumping Wells Test
  • Slug Tests

Pump Test Drawdown after 1000 minutes of pumping with constant rate. 3D visualization using GMS. Case Study : Cedar Creek Dam, Fort Worth, TX.

Data Measurements
Griffin professionals utilize automatic measurement technology (Solinst levelogger) to increase the accuracy of the aquifer tests data. Installed transducers in the piezometers or monitoring wells are able to record the measurements at the defined time intervals for a period of time. If required the data is accessible during the recording by using a handheld level loader. Manual measurements are usually performed to check the transducers data.

Drawdown and recovery test data. Case study in Osceola, AR.

Drawdown and recovery test data. Case study in Fruitland, NM.

Drawdown data collection during the pumping test, using Solinst levelogger. Case study in Osceola, Arkansas.

Data Analysis
Griffin professionals are experienced dealing with Aquifer test analysis. Griffin utilizes AQTESOLV software for different theoretical methods (e.g. Cooper-Jacob, Theis methodologies).

Pump Test Case study in Marina Del Rey, California
Distance-Drawdown Analysis using AQTESOLV

Pump Test Case study near Dallas/Fort Worth, TX
Distance-Drawdown Analysis on a semi-log graph.

Time- Drawdown analysis using AQTESOLVE. Pump Test Case study in Fruitland, NM.