This FREQ- tool consists of a time series analysis for groundwater level data followed by analysis of optimal monitoring frequency. Time series analysis assist to better understand the functioning of the groundwater system, and to identify the effect of abstraction and climate change on groundwater resources. The time series analysis is a step-by-step procedure to identify trends, periodic fluctuations and autoregressive model. These components together form the additive model.
Based on the time series analysis, an identification of the optimal monitoring frequency can be obtained. Monitoring frequency is one of the key parameters for groundwater monitoring network design.