Modeling tools
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Useful tools
Matlab model based on Christ and Goltz, 2002
Script for calculating the capture zone of wells. Based on the paper by Christ and Goltz, J. Hydrology, 2002, p. 224-244. [1].
Matlab model for capture zone calculation
Interpretation of water works data
Water works can offer the opportunity of getting cheap pump test data. Usually, they are operating one or several wells, which have often loggers for the water table installed. We show an example, where the water works in Fløng operates an alternating pumping scheme in 4 drinking water wells. We have asked them to use a high measurement frequency and to send us the logged data.
Slug tests and Aqtesolv model
Slug tests provide a cheap and quick way to get information about the local hydraulic conductivity. If several boreholes are close by, it can be a good option to do several slug tests. This will yield some information about local heterogeneities etc.
The principal idea behind slug tests is that the water level in a borehole is changed and the recovery, i.e. the change back to the original state is monitored. Therefore, the hydraulic head has to be measured. This can be done with manual measurements using common dip-meters or with automated measurements with pressure transducers. If the hydraulic conductivity close to the borehole is high (f.e. in a heavily fractured aquifer), the recovery happens very fast and it is necessary to have automated measurements.
There are different types of slug tests. A main distinction can be done between rising-head and falling-head slug tests.
Falling-head slug test
For a falling-head slug test, the water level in the borehole is abruptly increased. This can be done on different ways. Water can be added in a slug into the borehole
Rising-head slug test
For a rising-head slug test, water is removed from the borehole and the recovery of the water level is recorded afterwards.
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