The Module Hydrology – hereafter referred to as HYDMOD – aims at investigating and assessing the hydrological state inrelation to water management issues. The method evaluates the alterations of the natural flow regime with a set of selected parameters and indicators used to describe different characteristics of low, medium and high water regimes.

Recorded parameters:

Hydrological parameters (evaluation indicators):

  • Mean flow regime (characteristic of the mean discharge
  • High flow regime (Flood frequency, flood seasonality)
  • Low-flow regime (Discharge, seasonality, duration)
  • Short-term effects (Lock-out phenomenon, hydropeaking, flushing, rainwater runoff)
  • Interventions (Interventions are anthropogenic measures that affect the flow regime).


For each evaluation indicator, the difference between a reference (natural) state and the observed influenced state is evaluated (with the exception of rainwater runoff, as this type of event does not exist in the reference state). The punctual evaluation using the different evaluation indicators is then transposed to the water network in a next step. 

The evaluation is carried out in 5 categories.

The electronic tool (HYDMOD-FIT) and the GIS support files have been developed to simplify the assessments and to represent them in a cartographic way.