Zappel is a tool that plots the catchment area and the position of the isochrones of a borehole under the effect of pumping.
    Example of simulation of the calculation of a water well catchment area and isochrones

    Example of simulation of the calculation of a water well catchment area and isochrones.

    © BRGM

    Plotting the borehole catchment area 

    Developed by BRGM, Zappel software plots the borehole catchment area. 

    The catchment area can be defined as the area of an underground water table corresponding to groundwater flows which at some stage will end up at the borehole. This catchment area depends on the flow rate from the well and the water table characteristics. 

    Isochrone position calculation 

    Zappel also calculates the position of the isochrones. These are lines (contours) that connect points from which the time required for groundwater to reach the borehole is equal. 

    For example the 50-day isochrone means that any free molecule of water circulating in the underground water table at a location on this contour will take 50 days to reach the borehole, not taking dispersion phenomena into account. 

    Isochrones thus represent the interpolation of a set of points, each corresponding to a transfer time. The result can be exported in a SIG file. 

    Practical information 

    • Operating system: Windows (XP, 7), Linux 
    • Programming language: C++ 
    • Language: French 

    Advice on use

    In the event of a bug or interface display problem (the left-hand menu does not appear, for example):

    Drilling at the BRGM geothermal platform, Orléans

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