At DGI we provide quantitative solutions for water resources development and management in diverse hydrogeologic settings.
DGI has extensive experience with the performance of aquifer testing for determination of aquifer hydraulic properties, ranging from slug testing and low-rate pumping tests of low-permeability formations to large-scale well performance evaluations and aquifer tests of major water supply aquifers. We provide design, control and monitoring of aquifer tests, including real-time processing and analysis of test data, so that test strategy can be modified in the field if needed.
DGI utilizes analytical and numerical methods for analyses of aquifer test data to quantify aquifer hydraulic properties and well performance characteristics. Our analyses range from single-layer aquifer characterization to complex multi-aquifer interactions and surface/ground-water interactions. DGI has extensive experience analyzing aquifer test and well performance data for both fractured rock and unconsolidated aquifers.
DGI has over 35 years of experience with construction and calibration of finite-difference and finite-element numerical ground-water flow and transport models for determination of: water supply capacity; impacts to ground-water resources and other users of ground-water resources; wellhead protection areas; flow paths and travel times; and solute and heat transport.
DGI provides Very-Low-Frequency (VLF) electromagnetic surveys and Two-Dimensional Resistivity (2DR) Surveys for locating water-bearing fracture zones and defining thickness and configuration of unconsolidated deposits overlying bedrock. Geophysical information is used to identify drilling locations and to assist with interpretation of aquifer test data.
DGI provides a variety of techniques for characterization of infiltration and recharge for stormwater, treated effluent, and other types of recharge augmentation. These techniques include: basin infiltration tests; double-ring infiltration tests; laboratory permeameters; soil lysimeters; pilot-scale testing; and deep- and shallow-well injection tests.
DGI has over 35 years of experience with construction and calibration of finite-difference and finite-element numerical ground-water flow and transport models for determination of: recharge capacity; ground-water mounding impacts; flow paths and travel times; solute transport; and baseflow augmentation.
DGI provides Two-Dimensional Resistivity (2DR) Surveys for locating areas favorable for ground-water recharge, such as: near-surface fractured rock or unconsolidated deposits overlying bedrock formations. This information is often used for planning subsequent subsurface evaluations and for system concept design.