As any hydrogeologist knows, the Darcy flux can be estimated by multiplying the hydraulic conductivity (obtained by pumping test) with the hydraulic gradient of the site (measured in upstream/downstream piezometers). However, this way of proceeding accumulates the errors of each of the measured parameters, increasing the uncertainty around the estimated Darcy flux.
Cas n°1 : Site de captage d'eau avec des débits importants
On a water pumping site intended for water distribution, the water producer wanted to characterize the hydrodynamics of the alluvial aquifer around the pumping well.
The piezometers available on site have a diameter of 2 inches, making it impossible to install pumps powerful enough to induce a significant drawdown of the water level necessary to carry out a pumping test.
By directly measuring the Darcy flux in a single well, Nagaré was able to calculate very precisely the hydraulic conductivity of the aquifer at each piezometer.
The measurements are carried out in a few hours and there is no waste water to deal with.
The measurements are carried out in a few hours and there is no waste water to deal with.