Your search found 2 records
1 Descheemaeker, Katrien; Raes, D.; Nyssen, J.; Poesen, J.; Haile, M.; Deckers, J. 2009. Changes in water flows and water productivity upon vegetation regeneration on degraded hillslopes in northern Ethiopia: a water balance modelling exercise. Rangeland Journal, 31(2):237-249. [doi: https://doi.org/10.1071/RJ09010]
Water balance ; Simulation models ; Soil water ; Measurement ; Experiments ; Highlands ; Sloping land ; Grazing lands ; Pastures ; Vegetation ; Regeneration ; Water productivity ; Percolation ; Evapotranspiration ; Runoff / Ethiopia
(Location: IWMI HQ Call no: IWMI 636 100 AME Record No: H042211)
(0.61 MB)
The establishment of exclosures (i.e. areas closed for grazing and agriculture) is a common practice to reverse land degradation through vegetation regeneration in the semiarid highland areas of northern Ethiopia. In order to assess the effect of exclosures on water flows, the water balance components for different vegetation regeneration stages were assessed through field measurements and modelling. Successful model calibration and validation was done based on soil water content measurements conducted during 2 years in 22 experimental plots. In the protected areas, vegetation regeneration leads to an increase in infiltration and transpiration and a more productive use of water for biomass production. In areas where additional lateral water (runon) infiltrates, source–sink systems are created. Here, up to 30% of the annual rainfall percolates through the root-zone towards the groundwater table. Increased biomass production in exclosures leads to possibilities for wood harvesting and cut and carry of grasses for livestock feeding. Together with water conservation and more productive use of water, the latter contributes to increased livestock water productivity. At the landscape scale, the creation of vegetation filters, capturing resources like water and nutrients, reinforces the rehabilitation process and healthy landscape functioning.
2 Bolinches, A.; Blanco-Gutierrez, I.; Zubelzu, S.; Esteve, P.; Gomez-Ramos, A. 2022. A method for the prioritization of water reuse projects in agriculture irrigation. Agricultural Water Management, 263:107435. (Online first) [doi: https://doi.org/10.1016/j.agwat.2021.107435]
Water reuse ; Projects ; Agriculture ; Irrigation systems ; Wastewater treatment ; Treatment plants ; Infrastructure ; Pipes ; Pumping ; Prioritization ; Cost benefit analysis ; Regulations ; Optimization methods ; Sensitivity analysis ; Regeneration ; Ultrafiltration / Spain / Guadiana River Basin
(Location: IWMI HQ Call no: e-copy only Record No: H050865)
(8.67 MB)
Water reuse is a strategic priority for Water Authorities in Europe to reduce the pressure on water resources, although implementation is lagging behind expectations due to financial, administrative and social acceptance concerns. In this context, there is a special interest to identify in which specific Wastewater Treatment Plants it would be interesting to add a Water Regeneration Plant, taking account of potential existing clients in the vicinity and the implied costs and benefits. This paper proposes a method to quantify the infrastructure and operation costs of project implementation and the benefits of the additional water offer. An algorithm designs the distribution network, allowing for a quick cost analysis. The method is applied in the Upper Guadiana in Central Spain, where irrigation led to the overexploitation of the local aquifers and the subsequent restrictions on water use. Taking account of the existing Wastewater Treatment Plants, candidate reuse projects are classified according to their benefit/cost ratio, showing large differences according to the location and potential use of the regenerated water. The analysis allows for a quick assessment of the costs and benefits implied in different reuse projects and scenarios, providing science-based evidence to support water policy decisions.
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