Type Curve Solution Theis Equation

Type Curve Solution Theis Equation

What is it?

Type curves can be used to represents the theoretical response of an aquifer to a pumping test. By graphically "matching" data to a type curve, parameters for the data (such as transmissivity) can be estimated. Type curves are derived from flow equations with specified initial and boundary conditions and are typically dimensionless (such as a dimensionless pressure [head] vs. a dimensionless time). Depending on the complexity of the model, a single type curve or a family of type curves may be used.

Gringarten (1987)

How to use it:

1) Choose Aquifer Type and Image

Select the aquifer type and image.
Note: if aquifer type is changed, data need to be re-entered.

2) Define Pump Test Parameters

Assign values to the well pumping rate, and the distance between the pumping well and monitoring well.

3) Add Observation Data

Observation data should be entered in "Time,Value" format with one observation on each line. "Time" is the elapsed time since the start of the test, and "Value" is the water level (drawdown/elevation/depth). Make sure that the time and value units match those in the observation data. Click "Plot/Update Curves" to display data.

4) Match Data to Type Curve and Calculate Parameters

Drag data over type curve so it falls on the curve. Then click inside the data range to register the "match".
If using Unconfined Neuman type curve, user can create matches for both early and late stage data.
If needed enter additional fit parameters observed on the type curve image.
Click "Calculate Values from Image" to compute parameters.