Groundwater levels are influenced by a variety of factors, such as precipitation, evaporation, groundwater abstraction and the water level of streams, canals and rivers. Menyanthes® is the multi-faceted computer program which hydrologists can use to quickly and easily unravel the different external influences on the groundwater. It provides a clear picture of the impact of a hydrological measure and makes the evolution of the groundwater level predictable.
With Menyanthes® every hydrologist and ecologist can analyse time series, with no need to invest the time and have the scientific expertise required by other programs. This is because basic knowledge about the hydrological behaviour of groundwater systems is incorporated into the program. Menyanthes® supports the user with clear visualisations during all stages of the processing. It can use data in all kinds of formats and moreover has a supplementary HydroData module, which enables the efficient management and validation of the time series from automatic pressure transducers.
Multi-faceted tool box for the hydrologist
The foundation of Menyanthes® is an own database which can easily be filled with data from the KNMI, exports from commonly used databases for water level measurements (DAWACO, FEWS, DINO), raw data from dataloggers (e.g., Keller, Solinst, Diver, InSitu), and supplementary data from Excel or CSV. With these, Menyanthes® can for instance directly:
- show the location of the piezometers on a topographic or satellite-photo background;
- show a cross-section with the depth of the piezometer filters, possibly in combination with borehole sampling;
- show a graph of the evolution of the groundwater level over time;
- process the data interactively;
- determine the statistical properties of the groundwater level series, such as timelines, regime curves and GxG values.
Because Menyanthes® combines knowledge about the hydrological system with data-driven models, it can efficiently model time series with explanatory variables, such as (surplus) precipitation, evaporation, groundwater abstraction and surface water levels. It can also take into account (step) trends. Menyanthes® offers the possibility of conducting time series analysis according to the Box-Jenkins method, and carries out the necessary interpolation to a fixed measurement interval or automatic resampling. The time series models are stored and can be easily modified or tested, for example, with regard to their response functions, calibration statistics or statistical properties.
Thanks to the HydroData module, Menyanthes® makes the management of a high-frequency groundwater measurement network easy and comprehensible. This module reads and manages the series registered by automatic pressure transducers. It also allows for the storage of manual measurements, which can be used for the validation and possible correction of the pressure transducer data. In this way the model unlocks a treasure of reliable information. After validation, Menyanthes® can immediately produce time series models with the pressure transducer series.
Grip on groundwater systems
KWR developed Menyanthes® in collaboration with Delft University of Technology, Alterra and Artesia. The program’s development began in 2000 and, today, Menyanthes® is used by more than 150 national and international organisations: waterboards, provinces, municipalities, water companies and land managers. KWR also frequently uses Menyanthes® in its own work.
Menyanthes® is applied in a variety of ways to get a grip on groundwater systems. Waternet for instance used the program to determine whether a rise in the water level in its dune areas led to a sufficient rise in the groundwater level. In the Meuse river basin, the Province of Limburg used Menyanthes® to distinguish the impact of different external factors on the groundwater level. Menyanthes® is also suitable as a means of managing entire measurement networks, and the Province of Overijssel is using the program for this purpose.
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