Your search found 3 records
1 Elsheikh, A. E. M.; Zeinelabdein, K. A. E.; Elobeid, S. A. 2011. Groundwater budget for the upper and middle parts of the River Gash Basin Eastern Sudan. Arabian Journal of Geosciences, 4(3-4):567-574. [doi: https://doi.org/10.1007/s12517-010-0184-4]
Groundwater ; River basins ; Alluvial aquifers ; Water resources ; Meteorological data ; Surface water ; Water levels / Eastern Sudan / Gash River Basin
(Location: IWMI HQ Call no: e-copy only Record No: H044942)
(0.33 MB)
The River Gash Basin is filled by the Quaternary alluvial deposits, unconformably overlying the basement rocks. The alluvial deposits are composed mainly of unconsolidated layers of gravel, sand, silt, and clays. The aquifer is unconfined and is laterally bounded by the impermeable Neogene clays. The methods used in this study include the carry out of pumping tests and the analysis of well inventory data in addition to the river discharge rates and other meteorological data. The average annual discharge of the River Gash is estimated to be 1,056 × 106 m3 at El Gera gage station (upstream) and 587 × 106 m3 at Salam-Alikum gage station (downstream). The annual loss mounts up to 40% of the total discharge. The water loss is attributed to infiltration and evapotranspiration. The present study proofs that the hydraulic conductivity ranges from 36 to 105 m/day, whereas the transmissivity ranges from 328 to 1,677 m2/day. The monitoring of groundwater level measurements indicates that the water table rises during the rainy season by 9 m in the upstream and 6 m in the midstream areas. The storage capacity of the upper and middle parts of the River Gash Basin is calculated as 502 × 106 m3. The groundwater input reach 386.11 × 106 m3/year, while the groundwater output is calculated as 365.98 × 106 m3/year. The estimated difference between the input and output water quantities in the upper and middle parts of the River Gash Basin demonstrates a positive groundwater budget by about 20 × 106 m3/year
2 Amarnath, Giriraj; Alahacoon, Niranga; Gismalla, Y.; Mohammed, Y.; Sharma, Bharat R.; Smakhtin, Vladimir. 2016. Increasing early warning lead time through improved transboundary flood forecasting in the Gash River Basin, Horn of Africa. In Adams, T. E. III; Pagano, T. C. (Eds.). Flood forecasting: a global perspective. London, UK: Academic Press. pp.183-200.
International waters ; Weather forecasting ; Flooding ; Early warning systems ; Rainfall-runoff relationships ; Hydrology ; Hydrometeorology ; Topography ; Models ; Calibration ; River basins ; Flow discharge ; Hydrography ; Catchment areas ; Satellite observation ; Spatial database / Horn of Africa / Sudan / Ethiopia / Eritrea / Gash River Basin / Kassala
(Location: IWMI HQ Call no: e-copy only Record No: H047695)
(1.09 MB)
3 Amarnath, Giriraj; Simons, G. W. H.; Alahacoon, Niranga; Smakhtin, V.; Sharma, Bharat; Gismalla, Y.; Mohammed, Y.; Andrie, M. C. M. 2018. Using smart ICT to provide weather and water information to smallholders in Africa: the case of the Gash River Basin, Sudan. Climate Risk Management, 22:52-66. [doi: https://doi.org/10.1016/j.crm.2018.10.001]
Irrigation methods ; Flood irrigation ; Flooded land ; Remote sensing ; Geographical information systems ; Weather forecasting ; Weather data ; Smallholders ; River basins ; Information and Communication Technologies (icts) ; Crop production ; Crop yield ; Monitoring ; Water use ; Biomass ; Farmers ; Rain ; Case studies / Africa / Sudan / Gash River Basin
(Location: IWMI HQ Call no: e-copy only Record No: H048976)
In the Gash Delta of Eastern Sudan, spate irrigation (flood-recession farming) contributes substantially to rural livelihoods by providing better yields than rainfed dryland farming. However, spate irrigation farmers are challenged by the unpredictability of flooding. In recent decades, the number of farmers practicing spate irrigation has decreased, due to varying rainfall intensity and frequency, insufficient infrastructure and farmers’ limited capacity to manage such variations. One solution that may help farmers face such challenges is for them to access real-time water-related information by using smart Information and Communication a Technology (ICT). This paper shows how integrating remote sensing, Geographical Information Systems (GIS), flood-forecasting models and communication platforms can, in near real time, alert smallholder farmers and relevant government departments about incoming floods, using the Gash basin of Sudan as an example. The Ministry of Water Resources of Sudan used the findings of this study to transform farmers’ responses to flood arrival from being ‘reactive’, to planning for the flood event. Intensive on-site and institutional efforts to build the capacity of farmers, farmer organizations, development departments and officers of the Ministry helped to develop the initiative from simply sending ‘emergency alerts’ to enabling stakeholders to visually see the flood event unfolding in the region and to plan accordingly for storing water, operating spate-irrigation systems and undertaking cropping activities. The research, initially conducted on a 60 × 60 km site, was later extended to the entire Gash basin. The paper outlines how to develop tools that can monitor plot-specific information from satellite measurements, and supply detailed and specific information on crops, rather than providing very general statements on crop growth. Farmers are able to use such tools to optimize their farm profits by providing water to their crops in the right place, at the right time and in the right quantity. Finally, the work demonstrates the high potential of combining technology, namely remote sensing data and simple a agro-meteorological model with limited parameters, for large-scale monitoring of spate irrigation systems and information sharing to advise farmers as to how to apply this information to their managerial decisions.
Powered by DB/Text WebPublisher, from
