Due to the disproportionate increase in computational effort with the number of parameters to be optimised, it is necessary to zone the model parameters to be determined with inverse modelling, i.e. to group the parameters into zones of equal values. In SPRING there is the possibility of zoning the K values, the storage coefficients and the leakage coefficients. To do this, the attributes described in the following chapters must be assigned in the model.

Zoning the K-values and the storage coefficients