News

In arid East Africa, water is an increasingly scarce commodity. Governments in the region need better tools to manage this water, beginning with accurate estimates of rainfall in both real time and historically. The University of California, Irvine’s Center for Hydrometeorology & Remote Sensing (CHRS) has created satellite precipitation data and information systems that are useful for both purposes. G-WADI and its technical secretariat, ICIWaRM, have supported development of these tools for almost a decade.

As part of the UN High-Level Political Forum on Sustainable Development, UNESCO-IHP, World Meteorological Organization, the International Center for Integrated Water Resources Management (ICIWaRM) and the International Centre for Water Hazard and Risk Management (ICHARM) organized a side event on Hydrology towards Sustainable Resilient Societies. The event took place on July 10, 2018 at the United Nations headquarters in New York.

The G-WADI Program was featured in several talks at the 8TH GEWEX Open Science Conference: Extremes and Water on the Edge, May 6 - 11, 2018  in Canmore, Alberta, Canada. A presentation by UNESCO IHP staff, titled "Climate-informed Decision Making under Deep Uncertainty," highlighted products developed by G-WADI and its partners, such as Latin American and Caribbean Drought Monitor, the African Flood and Drought Monitor, the PERSIANN family of products, the Latin American and Caribbean Drought Atlas, and their applications.

The G-WADI Technical Secretariat  and IHP staff participated in the Regional workshop on climate services for improved water resources management in Harare, Zimbabwe, from 30 Jan - 1 Feb 2018. The workshop was attended by high level experts from SADC countries with support from UNESCO's Regional Office for Southern Africa, UNESCO's International Hydrological Programme (IHP), the Zambezi Watercourse Commission (ZAMCOM) and the Government of Flanders. G-WADI tools such as the African Flood and Drought Monitor were discussed for their potential applications to hydrologic extreme events in the region. More information on the meeting is available from UNESCO's Harare office.  

The Asian regional network of G-WADI held its 7th meeting and workshop at the National Geophysical Research Institute (NGRI), Hyderabad, India from Nov. 26-30, 2017. The major scientific topic of discussion at the workshop was an increased inclusion into G-WADI of research on semi-arid region groundwater systems. Use of airborne geophysical investigations to obtain a 3-D continuous picture of the subsurface, as well as the potential impacts of climate change, such as highly variable rainfall, increase in temperature, sea level rise etc., on groundwater fluxes were discussed.

Satellite-based precipitation estimates (SPE) are becoming valuable sources of rainfall data for hydrologic and climatic studies, especially where ground-based gauge measurements are sparse. They are, however, subject to considerable uncertainty due to their indirect measurement techniques. Effective merging of SPE and ground-based gauge measurements may help to improve precipitation estimation in terms of both resolution and accuracy. In a recent case study in Chile, a framework for merging satellite and gauge data was developed to produce high-quality precipitation estimates.

UNESCO has just published a new strategic plan for G-WADI, titled G-WADI: The Way Forward. The lead author is Dr. Wouter Buytaert of Imperial College, London. This paper gives a condensed overview of the achievements of G-WADI including the developments of tools and platforms to assist water managers during hydrologic extremes, as well as capacity-building efforts undertaken to date. It also notes G-WADI’s strengths as a global network supporting the science-policy interface, and catalyzing high-level research to address water management issues with direct relevance at the local level of management, planning, and policy.

The General Secretariat of the Arab Network for the Management of Water Resources in the Arid and Semi-Arid Regions of the Sultanate of Oman, in coordination and cooperation with the UNESCO Cairo Office, held the third general meeting of the Arab Network in Muscat, Sultanate of Oman from 17-19 September 2017. The meeting participants discussed the performance of the network since the last meeting, support for the Network, strengthening the links among the members, and cooperation and coordination with other international and regional networks.

Developed by Princeton University’s Terrestrial Hydrology Group in collaboration with UNESCO IHP, G-WADI secretariats and members, regional centers, the African Flood and Drought Monitor (AFDM) monitors and forecasts meteorological, agricultural and hydrological drought at various temporal and spatial scales. It also has a multi-decadal, historical reconstruction of the terrestrial water cycle against which current conditions can be compared.

Water-related software from the U.S. Army Corps of Engineers’ Hydrologic Engineering Center (HEC) is very popular internationally because it is high quality, is well documented, comes with training, is supported, and is freely downloadable. HEC’s hydrologic modeling system (HEC-HMS) is no exception. However, one limitation has been that it has not been possible to utilize the gridded precipitation option for areas outside of the United States due to limitations in how gridded data was stored in the model.