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Hydraulic Profiling Tool (HPT) and Mini-Pumping Test (MPT): characterizing hydrogeological properties in one push

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Hydraulic Profiling Tool (HPT) and Mini-Pumping Test (MPT): characterizing hydrogeological properties in one push

Watercycle reference

Groundwater and its flow largely determine the size of design and execution plans for various projects. Current consultancy practice still relies mainly on traditional, inaccurate methods. These measurements are often applied in a rough schematization of the subsurface in idealized homogeneous and isotropic aquifers. Accurate insight in the permeability variation within aquifers can offer optimization opportunities.

The HPT is a tool designed to evaluate the subsurface hydraulic properties of a site. A HPT-CPT probe is advanced in the subsurface while water is injected at a constant rate through a screen on the side of the probe. Pressure and flow rate are both logged versus depth, resulting in relative hydraulic conductivity index profiles of the soil. Absolute hydraulic conductivity values as well as specific storage values can be derived by performing in situ Mini-Pumping Tests (MPT) with the HPT-CPTU at various depths.

Efficient and economical acquisition of various continuous hydrogeological datasets incl. CPT data in a single push. It allows an intensive complete investigation of the subsurface with minimal invasion / disturbance. 

The continuous (relative) hydraulic conductivity profiles based on the HPT and MPT technique offer advantages in many projects where groundwater flow plays a role or additional parameters are required for a detailed classification.

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