Ansdimat > AnsTest

AnsTest is a module for the interpretation of aquifer test


Pumping Tests

The most common aquifer test in which a well is pumped at a controlled rate and water-level response is measured in the same well or in surrounding observation wells. Is used to determine hydraulic properties.

Slug Tests

A type of field experiment where a slug of water is quickly (the interpretation assumes -instantaneously) added or removed from a groundwater well, and the water level response is monitored through time.

Stream-aquifer Tests

Combined analysis of well and stream hydrographs to determine properties of a stream bed and an underlying aquifer. This method can also be used to determine isolating properties of lake bottom sediments.

Pulse Tests

In a pulse test, an increment of pressure is applied to a well interval that is isolated by packers. zone. The decay of pressure is monitored within the same zone using automatic recording pressure transducers. This type of field experiments is most common in low-permeable rocks.

Constant-Head Tests

Aquifer test in which piezometric head (drawdown) in a well is maintained at a constant level while water discharge rate is monitored. A typical application is an aquifer test in a flowing artesian borehole with the potentiometric surface that is above the ground.

Analysis workflow: selection of analytical solution is easy with AnsTest-guided process.

Step 1. Choose conceptual scheme.
Step 2. Define type of boundaries.
Step 3. In “matching parameters” window select an analytical solution from the list. The solutions are already pre-selected by AnsTest for your specific hydrogeological conditions and boundaries.


Supported type of hydrogeological conditions

Aquifers


1. Non-leaky confined aquifer
2. Point source in confined profile anisotropic aquifer
3. Linear source in confined aquifer anisotropic on the vertical plane
4. Unconfined aquifer
5. Leaky aquifer system
6. Two-layer aquifer system (unconfined aquitard above the confined aquifer)
7. Arealy heterogeneous aquifer
8. Pumping near river
9. Multi-layer aquifer systems (two- or three-layer)
10. Fracture

Boundaries


1. Aquifer of infinite lateral extent
2. Semi-infinite aquifers
3. Strip aquifers
4. Wedge-shaped aquifers
5. Rectangular aquifers
6. Circular aquifers


Case Studies

Interpretation of packer tests in fractured schists,Olimpiada open pit in the Krasnoyarsk region (Russia)

Client: Polyus Gold
Objective: Determination of hydraulic conductivity in low-permeable schist formations
Method: Lugeon test tool in Hydrogeologist Workbench


Interpretation of a step-drawdown test to plan for a constant rate pump test in St-Petersburg

Client: Municipal government of St-Petersburg, Russia
Objective: Determine well efficiency and optimal pumping rate for a constant rate pump test
Method: Interpretation of step-drawdown tests in ANSDIMAT+


Slug tests in packer-isolated intervals for planning Radioactive waste disposal (Krasnoyarsk region, Russia)

Client: Russian state company
Objective: Determination of hydraulic conductivity changes with depth in fractured gneiss rocks
Method: Interpretation of slug-tests on packer-isolated intervals


Determination of river bed conductance by monitoring data. Nuclear energy construction site, Hungary

Client: Government of Hungary
Objective: River bed conductance is required for numerical model to predict inflow into excavations
Method: The required parameters were determined from analysis of long-term records of shallow water table in monitoring wells and Danube River hydrograph