(C) Chen Hu / Unsplash
Modelling and Assessment

Modelling // Quantifying and Mapping of Water-related Ecosystem Services for Enhancing the Security of the Food-Water-Energy Nexus in Tropical Data–sparse Catchment

By Mesfin Sahle, Osamu Saito, Christine Fürst and Kumelachew Yeshitela. The food-water-energy nexus concept helps to produce an integrative solutions to secure the water-related ecosystem services sustainably. This study aims to quantify and map water provisioning and soil erosion regulating services from both demand and supply sides in a spatially explicit manner. It considers the Wabe River catchment of the Omo-Gibe Basin in tropical data-sparse region of East Africa as a case study and uses the Integrated Valuation of Ecosystem Services and Trade-offs (InVEST) annual and seasonal water yield and sediment delivery models.

The water demands and biophysical parameters data were collected from primary and secondary sources and prepared according to the requirement of the models. The models output were validated after conducting sensitivity analysis of the input parameters.

The result shows that the rainfall amount of the catchment is highly seasonal, which causes the surface water to vary according to the seasons. The high annual precipitation and low actual evapotranspiration of the catchment resulted high annual water yields. However, the people in the catchment did not satisfied their domestic water demand as result of inaccessibility and poor management of the rain water. The high net supply of water, especially in the rainy season, carries detached top soil via heavy rainfall in the upper catchment areas. Even though the existing land cover and management practices contribute to sediment retention, a large amount of sediment is exported to rivers, which jeopardizes the food and energy security.

Thus, the management of water is essential for enhancing the security of the food-water-energy nexus in the catchment. The methods applied in this study can increase spatial understanding of the water-related ecosystem services especially in data–sparse catchments of the tropics, and lead to improvement of water management to enhance the security nexus.


  • Losses in regulating capacities of ecosystem could lead to insecure the nexus food-water-energy.
  • High annual water yield catchment may not satisfy the community’s demand for water.
  • Loss of soil due to climatic factors can be prevented through cover and land management.
  • Management of water have a central role to improve the security of the nexus.
  • The net budgets of water-related ecosystem services can be quantified and mapped in data–sparse catchments.


ScienceDirect website


July 2018


Science of The Total EnvironmentVolume 646, 1 January 2019, Pages 573-586

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Research Papers, Publications and Books

Towards Bridging the Water Gap in Texas // A Water-Energy-Food Nexus Approach

By: Bassel Daher, Sang-Hyun Lee, Vishakha Kaushik, John Blake, Mohammad H.Askariyeh, Hamid Shafiezadeh, Sonia Zamaripa, Rabi H. Mohtar. The 2017 Texas Water Development Board's State Water Plan predicts a 41% gap between water demand and existing supply by 2070. This reflects an overall projection, but the challenge will affect various regions of the state differently.

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Research Papers, Publications and Books

The Water‐Energy Nexus of Hydraulic Fracturing // A Global Hydrologic Analysis for Shale Oil and Gas Extraction

By: Lorenzo Rosa, Maria Cristina Rulli, Kyle Frankel Davis and Paolo D'Odorico. The authors present a global analysis of the impact of shale oil and gas extraction on water resources, particularly on irrigated crop production. Using a water balance analysis, they find that large areas underlain by shale deposits are either already affected by water stress or would become water stressed in the event that local water resources were to be used for shale oil or gas extraction.

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Video // The Alberta Water Nexus: Energy, Food, and People

Most of your daily decisions influence the demand for water. The interconnected system of food, energy, and people relies on the water in our basin. The amount of water is limited, so all the players in this system must cooperate to share our water resources.

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