In principle, there are different methods for obtaining estimates of the parameters and fluxes in groundwater systems. The alternatives are field and/or laboratory measurements, groundwater flow models and time series analysis. The advantage of time series models is that they are simple, easy to use, and generally very accurate.
In this case study, non-linear time series models were used to investigate the dynamics and functioning of small bog and pool systems, and their interaction with the surrounding environment. The model results proved to be very accurate in such a system, with average errors below a centimetre in some case. Through time series analysis, much insight was gained into the detailed functioning of these bogs and pools. In addition, the results showed that getting estimates of the resistances of such systems may present a fundamental problem, when there is a lack of information or observations on the levels to which they drain.