The Global Groundwater Monitoring Network (GGMN) is a participative, web-based network of networks, set up to improve quality and accessibility of groundwater monitoring information and subsequently our knowledge on the state of groundwater resources. GGMN is a UNESCO programme, implemented by IGRAC and supported by many global and regional partners. The GGMN Programme consists of two components:
- The GGMN Portal
- The GGMN People Network
The GGMN Portal
The GGMN portal gives insights on the availability of groundwater monitoring data through space and time. Groundwater level data and changes occurring in groundwater levels can be displayed on a regional scale. Additional data layers and information are available to understand the monitoring data in a broader water-related context.
The web-based software application assists in the spatial and temporal analysis of monitoring data. The system is integrated with QGIS to process data offline. QGIS is an open source Geographic Information System that contains variety of functionalities to analyse the data and create spatially interpolated groundwater level maps.
Your GGMN Portal
Member states which are interested in making use of the GGMN are provided with a password protected environment within the GGMN application. This allows users to upload, interpolate and analyse the groundwater data using the following options:
- Representative groundwater point measurements can be uploaded to the protected environment. Alternatively, measurements can be transferred from a national system via web services.
- Data can be displayed showing the mean, range or change in groundwater level for a selected time period.
- The GGMN is integrated with QGIS to process data offline. Point measurements can be combined with proxy information and personal expertise to create groundwater level maps. Produced groundwater maps can be shared via the online GGMN Portal.
- Time series analysis can be performed for each point measurement location to better understand temporal changes of groundwater levels. The time series analysis is a step-by-step procedure to identify trends, periodic fluctuations and autoregressive model. Time series analysis helps defining optimal monitoring frequencies, one of the key components of groundwater monitoring network design.
Your GGMN Portal can be configured for one organization, for multiple organizations in one country, multiple organizations sharing an aquifer, or it can be used within projects which aim to collect groundwater data on a regional scale from various sources.
The GGMN People Network
The GGMN relies on the participation of groundwater specialists with knowledge of regional hydrogeology. Regional (spatial) interpolation of groundwater point measurements is much more than a numerical interpolation and averaging process. It needs to be carried out by regional experts with a clear understanding of local hydrogeological conditions, existing monitoring practices, historic developments, socio-economic changes and other relevant factors. Therefore, establishing a network of regional groundwater specialists is the key task of the GGMN.
Regional workshops are organised to strengthen and expand the GGMN People Network. The workshops are intended for regional groundwater specialists to become familiar with the GGMN Programme and the functionality of the GGMN Portal. For countries without an online groundwater database, the GGMN Portal can be fully employed. The workshop participants have the opportunity to discuss the programme with their peers from neighbouring states with whom they may be sharing groundwater resources. After the workshop, participants will have the opportunity to acquire an active role in the GGMN People Network and to continue using the GGMN interactive portal.
The GGMN operates according to principles of the World Meteorological Organization (WMO) and UNESCO with the aim of encouraging the widespread use of hydrological data for national, regional and global studies. Members and other data providers are encouraged to contribute to improve quality and accessibility of groundwater monitoring information, by contributing to the GGMN quality controlled, hydrological data, together with meta-information on the monitoring stations. Nevertheless, data providers can always determine the level of data accessibility by third parties: open, limited or restricted access.