Most recent research has focused on identifying historical megadroughts based on paleo-records and understanding their climatic causes, or on the study of “modern” events and their impacts, generally in lowland and plain regions. However, high-mountain regions and snow-dependent catchments have been little studied, and little is known about the impact of megadroughts on the state and dynamics of the cryosphere in mountain water towers.  

In general, catchments dependent on high mountain systems have an intrinsic capacity to buffer the lack of precipitation and excess evapotranspiration that depends on the water reserves stored in the cryosphere (snow, glaciers and permafrost). It is presumed that the this buffer capacity is limited until a tipping point is reached from which the impacts of water shortages and temperature extremes may be amplified and jeopardize the functioning of ecosystems and water resource systems. 

MegaWat has a two-fold objective: 1) to address the knowledge gaps around the hydro-climatic causes of extreme droughts and their impact on the water balance of Europe’s mountain water towers, with special emphasis on the concurrence of compound events and cascading and multi-scale effects, and 2) to develop and propose new adaptation strategies to cope with the duration, extent and severity of future megadroughts and their potential impacts on environmental and socio-economic assets.  

For its implementation, MegaWat focuses on Europe’s high mountain regions and their dependent-catchments. MegaWat aims to develop three products:  

  • Product 1. A methodological framework for the identification and characterization of historical megadroughts during the instrumental period, and the assessment of the role of the cryosphere in supporting the landscape development of downstream areas, or in buffering climate change impacts. Product 1 relies on a combination of climate regionalization, surface energy balance modelling, hydrological simulation, and water evaluation and allocation analysis at the catchment level (Figure 1).  
  • Product 2. A high-resolution, open-access regionalized climate database.  
  • Product 3. A list of potential adaptation strategies useful for the prevention and mitigation of drought impacts, and the enhancement of the water security and resilience of high mountain regions and dependent catchments. These scenarios will be agreed with regional and local actors and stakeholders, and their effectiveness will be evaluated under extreme drought scenarios in three pilot regions in Europe. These pilot regions will be previously selected following criteria of representativeness, strategic importance and vulnerability to droughts.  

FutureWater plays an important role in MegaWat by coordinating the Work Package which aims to develop and test simulation tools that help to adapt to megadroughts and support the decision making process. Two specific objectives are pursued in this Work Package: a) the development of a methodological prototype for quantifying impacts and identifying tipping points for water security in snow-dependent downstream catchments, and b) the generation and the integration of snow drought indicators in the FW’s Drought Early Warning System called InfoSequia (Figure 2). 

Schematic representation of a high mountain basin, including the main components, processes and impacts related to droughts. 
Workflow of the InfoSequia Early Warning System developed by FutureWater and adapted for the detection of tipping-points of water scarcity in snow-dependent catchments. More information about InfoSequia.

One-pager can be downloaded here.

Aknowledgements  

This project has received funding from the Water4All programme with co-funding from CDTI (Spanish Office for Science and Technology) and the EU’s Horizon Europe Framework Programme for Research and Innovation”. 

Increasing water scarcity continues to threaten the agricultural sector in Asia. To address this critical issue, FAO and its partners have been developing a comprehensive Asia-Pacific Water Scarcity Programme (WSP) since 2019. The program aims to assess the ongoing issue of water scarcity in the region, evaluate potential management options, and assist partner countries in implementing adaptive management in the agricultural water sector using innovative tools and approaches.

Addressing the issue of water scarcity requires a sound understanding and development of water accounts to ensure evidence-based decision-making for equitable use and allocation of water resources under a changing climate. To achieve this, a comprehensive hands-on training program on water accounting will be developed and implemented across four countries: Indonesia, Lao PDR, Vietnam, and Thailand. In collaboration with the Regional Office for Asia and the Pacific (RAP) of the Food and Agriculture Organization of the United Nations (FAO), FutureWater will design and deliver the water accounting training program. This program aims to not only improve participants’ understanding of water accounting but also enable them to use modern and innovative tools to develop water accounts, with a particular focus on quantifying linkages between field interventions and basin-scale hydrology.

Participants will work with tools such as REWAS and Follow the Water (developed by FutureWater in collaboration with FAO) to conduct water accounting in agricultural systems at different scales. Through the use of these tools, participants will be able to estimate real water savings at system and basin scales and analyze the impact of different irrigation schemes on the overall water availability in the system. Moreover, participants will also learn how to access and extract remotely sensed datasets to assess the status of the water resources in the Nam Ngum pilot basin.

The WEAP model simulates water availability, supply, and demand on a small scale for over 40 irrigation, domestic, and industrial sites, running on a daily timestep to include detailed reservoir operations and water use abstractions. The updated WEAP model was co-designed together with ARA-Sul, the regional water authorities of southern Mozambique. Monthly meetings were held to support information sharing and co-ownership throughout the project.

The model will aid ARA-Sul in water accounting and the licensing of water users served by the Pequenos Libombos Reservoir. The Pequenos Libombos Reservoir, with a storage capacity of 350 MCM, is the main water supplier to the Maputo Metropolitan Area inhabited by over 3 million people. In June 2024 sessions were held in The Netherlands were ARA-Sul was trained in the usage of the model.

The cover picture was taken by David Mucambe (ARA-Sul).

The aim is to develop a business case for a Watershed Investment Program for Addis Ababa. It includes stakeholder and governance analysis, scientific modeling, return on investment (ROI) analysis, and an implementation plan. Hydrological models are employed to assess the potential of Nature-based Solutions to mitigate the negative trends in the watershed, and improve water supply reliability, water quality, sedimentation and agricultural productivity. The study should raise awareness for all key stakeholders and potential investors. The study is performed under the Nature for Water Facility launched by The Nature Conservancy.

FutureWater will develop a high-level climate change and adaptation assessment for Turkmenistan to strengthen the water and agriculture sector’s resilience against climate change. The work involves a detailed hazard mapping exercise, employing observational and satellite-based information, to identify climate-related risks such as droughts, water scarcity, heat, salinity, erosion, and floods. These mapped hazards will be synthesized at the administrative level, presenting a comprehensive visual representation through figures and tables.

Key exposure and vulnerability datasets will be mapped, and pertinent sources for subsequent collection and analysis will be identified, setting the stage for a detailed risk assessment beyond the scope of work. The key output of this effort is the assembly of an inventory of climate adaptation measures gleaned from existing reports and official documents, contextualized to Turkmenistan’s unique circumstances, and an initial gap and opportunity assessment based on this inventory.

Based on the assessment, the adaptation options will be categorized and an initial prioritization will take place based on each option’s potential to mitigate risks across various hazards, its capacity for impactful outcomes beyond local scales, and a relative indication of expected cost-effectiveness. The outcome should provide a foundation for an integrated climate adaptation project. Concurrently, FutureWater will engage in country consultations, collaborating with stakeholders to confirm or refine identified adaptation options. These consultations will also explore potential synergies with ongoing and planned projects initiated by both the government and development partners.

As part of the FAO’s Asia-Pacific Water Scarcity Programme (WSP), FutureWater conducts a scoping study to identify opportunities to improve sustainable water resources management in the country. Following this scoping assessment, FutureWater develops bankable investment concept notes for activities to strengthen national capacities to implement policy actions that prepare Mongolia for a water scarce future. As part of the project, a high level stakeholder consultation forum with key government stakeholders and development partners is organized to validate the findings of the assessment and prioritize the investment concepts.

Mongolia has a strong commitment to IWRM, as defined in the 2012 Water Law, and good progress has been made. This includes the establishment of river basin organizations (RBOs) to manage the 29 river basins in the country. Currently, there are 21 operational RBOs. However, these bodies lack the experience needed for implementation of their tasks. Training and professional development of employees of the water basin authorities are of the utmost importance, to enable them to implement the assigned tasks and be better positioned for advancing implementation of Target 6.5 of the 2030 Agenda for Sustainable Development.

 

Within the project we cooperate with the hydrologists of ARA-Norte to discuss and establish the baseline for a water system analysis in the Monapo Catchment. Following discussion and mapping sessions, FutureWater is developing a Water Allocation Model in WEAP that includes climate change scenarios and mitigation and adaptation measures to asses the water availability of the catchment. Part of the assignment includes continuous training to local professional, to ensure the application of the developed model in the analysis of the system and elaborating specific proposal for implementation in the region.

Southern Spain is a highly productive agricultural region, but with huge challenges around water scarcity and environmental sustainability. There is a demand in the agricultural sector to work towards water stewardship in Spain. The Alliance for Water Stewardship has developed a Standard which helps retailers and their suppliers to cause change at scale. This approach recognizes that there are common challenges that could be more easily overcome through a collective, place-based approach.

In the Doñana region, berry farms and groundwater usage are causing a conflict with the unique ecosystems in the National Park. A catchment assessment and active stakeholder engagement is needed as a first step in this region to work towards water stewardship. The catchment assessment will provide information on the catchment context, in line with the requirements of the Standard. The purpose of the assessment is to reduce the burden on agricultural sites by providing them with a common set of information which they and others can use to inform responses to their shared water challenges.

Groundwater availability is critical to the Umbeluzi Catchment. Currently, there is a need for a simple tool that can asses the availability of resources in the ground.

This especially to asses the permits for groundwater extractions. It is expected that a simplified modelling approach can provide a trend analysis sufficient for the water authorities in Mozambique to perform assessments of the sub-surface water availability. Furthermore, the water availability will be assessed for current and future conditions, under different scenarios of climate change and demand increase.

Within the project, FutureWater will develop a groundwater model in WEAP, using the Strategic Model previously build for the Umbeluzi catchment. To this end a detailed data gathering activity will take place proceed by developing the model. We aim to validate and improve the model with measurements available of groundwater levels in the catchment. The model will be validated with the technical team of ARA-Sul. Ultimately, a dedicated training session for ARA-SUl will ensure that model operation is performed by local experts.

In our ongoing commitment to bolster the efforts of ARA-Sul in Mozambique, FutureWater recently conducted an intensive training course focusing on the application of the Strategic Water Allocation Model within the Umbeluzi Catchment area. This significant initiative entailed the utilization of the renowned Water Evaluation and Planning System (WEAP) model, coupled with a comprehensive update of critical information and underlying assumptions.

The primary objective of this training was to empower the dedicated professionals at ARA-Sul with the knowledge and skills necessary to effectively manage and optimize water resources within the region. The strategic allocation of water resources is of paramount importance, especially in areas like the Umbeluzi Catchment, where water plays a pivotal role in sustaining livelihoods, ecosystems, and economic activities.

One key aspect of this training involved fine-tuning the analysis-scenarios to comprehensively assess potential bottlenecks and challenges within the water allocation system. Identifying these bottlenecks is essential for making informed decisions, developing mitigation strategies, and ensuring the sustainable utilization of water resources.

Our collaborative efforts with ARA-Sul extend beyond the training itself. We are committed to providing ongoing support and guidance to ensure the long-term success of this endeavor. Through regular follow-up activities and consultations, the technical professionals at ARA-Sul are now well-equipped to independently maintain their model and conduct the essential analyses required for informed decision-making.

More information on the training here

Training on WEAP. June 2023.