Your search found 10 records
1 Nhamo, Luxon; Mabhaudhi, T.; Magombeyi, Manuel. 2016. Improving water sustainability and food security through increased crop water productivity in Malawi. Water, 8(9):1-12. [doi: https://doi.org/10.3390/w8090411]
Food security ; Water management ; Water productivity ; Water scarcity ; Water use ; Freshwater ; Crop production ; Sustainability ; Agricultural production ; Evapotranspiration ; Population growth ; Urbanization ; Maize ; Rainfed farming ; Irrigation systems ; Smallholders / Malawi
(Location: IWMI HQ Call no: e-copy only Record No: H047747)
(1.48 MB)
Agriculture accounts for most of the renewable freshwater resource withdrawals in Malawi, yet food insecurity and water scarcity remain as major challenges. Despite Malawi’s vast water resources, climate change, coupled with increasing population and urbanisation are contributing to increasing water scarcity. Improving crop water productivity has been identified as a possible solution to water and food insecurity, by producing more food with less water, that is, to produce “more crop per drop”. This study evaluated crop water productivity from 2000 to 2013 by assessing crop evapotranspiration, crop production and agricultural gross domestic product (Ag GDP) contribution for Malawi. Improvements in crop water productivity were evidenced through improved crop production and productivity. These improvements were supported by increased irrigated area, along with improved agronomic practices. Crop water productivity increased by 33% overall from 2000 to 2013, resulting in an increase in maize production from 1.2 million metric tons to 3.6 million metric tons, translating to an average food surplus of 1.1 million metric tons. These developments have contributed to sustainable improved food and nutrition security in Malawi, which also avails more water for ecosystem functions and other competing economic sectors.
2 Nhamo, Luxon; Ebrahim, Girma Yimer; Mabhaudhi, T.; Mpandeli, S.; Magombeyi, Manuel; Chitakira, M.; Magidi, J.; Sibanda, M. 2020. An assessment of groundwater use in irrigated agriculture using multi-spectral remote sensing. Physics and Chemistry of the Earth, 115:102810. [doi: https://doi.org/10.1016/j.pce.2019.102810]
Groundwater assessment ; Crop water use ; Irrigated farming ; Remote sensing ; Climate change ; Resilience ; Water management ; Water productivity ; Evapotranspiration ; Estimation ; Irrigated land ; Satellite imagery ; Dry season / South Africa / Limpopo / Venda-Gazankulu
(Location: IWMI HQ Call no: e-copy only Record No: H049420)
(2.23 MB)
Declining water resources in dry regions requires sustainable groundwater management as trends indicate increasing groundwater use, but without accountability. The sustainability of groundwater is uncertain, as little is known about its extent and availability, a challenge that requires a quantitative assessment of its current use. This study assessed groundwater use for irrigated agriculture in the Venda-Gazankulu area of Limpopo Province in South Africa using crop evapotranspiration and irrigated crop area derived from the normalised difference vegetation index (NDVI). Evapotranspiration data was derived from the Water Productivity through Open access of Remotely sensed Actual Evapotranspiration and Interception (WaPOR) dataset (250 m resolution), and irrigated areas were characterised using dry season NDVI data derived from Landsat 8. Field surveys were conducted for four years to assess accuracy and for post-classification correction. Daily ET for the dry season (May to September) was developed from the actual ET for the irrigated areas. The irrigated areas were overlaid on the ET map to calculate ET for only irrigated land parcels. Groundwater use during the 2015 dry period was 3627.49 billion m3 and the irrigated area during the same period was 26% of cultivated land. About 82 435 ha of cultivated area was irrigated using 44 million m3 /ha of water, compared to 186.93 million m3 /ha on a rainfed area of 237 847 ha. Groundwater management is essential for enhancing resilience in arid regions in the advent of water scarcity.
3 Abiye, T. A.; Tshipala, D.; Leketa, K.; Villholth, Karen G.; Ebrahim, Girma Y.; Magombeyi, Manuel; Butler, M. 2020. Hydrogeological characterization of crystalline aquifer in the Hout River Catchment, Limpopo Province, South Africa. Groundwater for Sustainable Development, 11:100406. [doi: https://doi.org/10.1016/j.gsd.2020.100406]
Aquifers ; Hydrogeology ; Catchment areas ; Groundwater flow ; Groundwater table ; Groundwater recharge ; Groundwater irrigation ; Isotopes ; Rain / South Africa / Limpopo Province / Hout River Catchment
(Location: IWMI HQ Call no: e-copy only Record No: H049720)
(4.26 MB)
This study attempted to conceptualize the hydrogeological setting of the Hout River Catchment, located in the Limpopo River Basin, using multiple methods that include groundwater flow patterns, structural analysis, stable (18O, 2H and 13C) and radiogenic (14C) isotopes of water and Water Table Fluctuation methods. The hydrogeological system of the catchment is represented by fractured crystalline basement aquifer as the main host for groundwater and is overlain by weathered rocks that act as a vadose zone and shallow aquifer in various places. Groundwater from the fractured basement rocks is the main source of water for large-scale irrigation and domestic use. Potential aquifers in the area are evident within the Hout River granitic gneiss and the Goudplaats granitic gneiss besides the younger granites as a result of fracturing and weathering. Groundwater flow map shows a flow pattern from the southern part of the catchment towards the north-eastern part of the catchment dictated by dolerite dykes and tectonic lineaments that trend in the ENE and E direction (088° and 075°) with the dip angle of 50° to 55°. The deeper aquifer in the southern and central part of the catchment contain old groundwater with high salinity due to long residence time. The stable isotopes further confirmed the limited possibility of local recharge, with rather dominance of regional groundwater circulation into the catchment. The northern part of the catchment seems to be receiving recent recharge with the groundwater of high 14C content derived from the mountains that border the catchment.
4 Pavelic, Paul; Magombeyi, Manuel; Schmitter, Petra; Jacobs-Mata, Inga. 2021. Sustainable expansion of groundwater-based solar water pumping for smallholder farmers in Sub-Saharan Africa. Washington, DC, USA: Efficiency for Access Coalition. 54p.
Groundwater irrigation ; Solar energy ; Pumping ; Smallholders ; Farmer-led irrigation ; Water resources ; Water availability ; Water use ; Risk management ; Markets ; Sustainable Development Goals ; Case studies / Africa South of Sahara
(Location: IWMI HQ Call no: e-copy only Record No: H050613)
https://storage.googleapis.com/e4a-website-assets/Sustainable-expansion-of-groundwater-based-solar-water-pumping-for-smallholder-farmers-in-Sub-Saharan-Africa.pdf
https://vlibrary.iwmi.org/pdf/H050613.pdf
https://vlibrary.iwmi.org/pdf/H050613.pdf
(10.70 MB) (10.7 MB)
5 Dickens, Chris; O'Brien, G.; Magombeyi, Manuel; Mukuyu, Patience; Ndlovu, B.; Eriyagama, Nishadi; Kleynhans, N. 2020. E-flows for the Limpopo River Basin: basin report. Project report prepared by the International Water Management Institute (IWMI) for the United States Agency for International Development (USAID). Colombo, Sri Lanka: International Water Management Institute (IWMI); Washington, DC, USA: USAID. 134p. (E-flows for the Limpopo River Basin: Report 2) [doi: https://doi.org/10.5337/2022.217]
Environmental flows ; River basin management ; Transboundary waters ; Water requirements ; Socioeconomic aspects ; Water resources ; Water use ; Groundwater recharge ; Surface water ; Water availability ; Water quality ; Water policies ; Climate change ; Rainfall ; Water supply ; Water balance ; Water demand ; Hydrology ; Ecosystems ; Tributaries ; Runoff ; Drought ; Flooding ; Infrastructure ; Dams ; Power plants ; Catchment areas ; Aquifers ; Boreholes / Botswana / Mozambique / South Africa / Zimbabwe / Limpopo River Basin
(Location: IWMI HQ Call no: e-copy only Record No: H051951)
(4.87 MB)
6 Dickens, Chris; Mukuyu, Patience; Ndlovu, B.; O'Brien, G.; Stassen, R.; Magombeyi, Manuel. 2020. E-flows for the Limpopo River Basin: from vision to management. Project report prepared by the International Water Management Institute (IWMI) for the United States Agency for International Development (USAID). Colombo, Sri Lanka: International Water Management Institute (IWMI); Washington, DC, USA: USAID. 104p. (E-flows for the Limpopo River Basin: Report 3) [doi: https://doi.org/10.5337/2022.218]
Environmental flows ; River basins ; Aquatic ecosystems ; Ecosystem services ; Water purification ; Cultural services ; Livelihoods ; Risk ; Ecological factors ; Habitats / Zimbabwe / South Africa / Mozambique / Botswana / Limpopo River Basin
(Location: IWMI HQ Call no: e-copy only Record No: H051952)
(3.61 MB)
7 Dickens, Chris; O'Brien, G.; Stassen, R.; van der Waal, B.; MacKenzie, J.; Eriyagama, Nishadi; Villholth, Karen; Ebrahim, Girma; Magombeyi, Manuel; Wepener, V.; Gerber, S.; Kaiser, A.; Diedericks, G. 2021. E-flows for the Limpopo River Basin: specialist literature and data review. Project report prepared by the International Water Management Institute (IWMI) for the United States Agency for International Development (USAID). Colombo, Sri Lanka: International Water Management Institute (IWMI); Washington, DC, USA: USAID. 252p. (E-flows for the Limpopo River Basin: Report 4) [doi: https://doi.org/10.5337/2022.219]
Environmental flows ; River basins ; Hydrology ; Groundwater ; Water quality ; Geomorphology ; Hydraulics ; Vegetation ; Fish ; Aquatic invertebrates / Botswana / Mozambique / South Africa / Zimbabwe / Limpopo River Basin
(Location: IWMI HQ Call no: e-copy only Record No: H051953)
(9.48 MB)
8 O'Brien, G.; Dickens, Chris; Stassen, R.; Erasmus, H.; Herselman, S.; van der Waal, B.; Wepener, V.; Pearson, H.; LeRoux, H.; Villholth, Karen; Ebrahim, Girma; Magombeyi, Manuel; Riddell, E.; Petersen, R. 2022. E-flows for the Limpopo River Basin: present ecological state - drivers of ecosystem change. Project report prepared by the International Water Management Institute (IWMI) for the United States Agency for International Development (USAID). Colombo, Sri Lanka: International Water Management Institute (IWMI); Washington, DC, USA: USAID. 296p. (E-flows for the Limpopo River Basin: Report 5) [doi: https://doi.org/10.5337/2022.220]
Environmental flows ; River basins ; Ecosystems ; Ecological factors ; Hydrology ; Groundwater ; Surface water ; Hydraulics ; Geomorphology ; Water quality / South Africa / Mozambique / Botswana / Zimbabwe / Limpopo River Basin
(Location: IWMI HQ Call no: e-copy only Record No: H051954)
(10.8 MB)
9 O'Brien, G.; Dickens, Chris; Wade, M.; Stassen, R.; Diedericks, G.; MacKenzie, J.; Kaiser, A.; van der Waal, B.; Wepener, V.; Villholth, Karen; Ebrahim, Girma; Dlamini, V.; Magombeyi, Manuel. 2022. E-flows for the Limpopo River Basin: environmental flow determination. Project report prepared by the International Water Management Institute (IWMI) for the United States Agency for International Development (USAID). Colombo, Sri Lanka: International Water Management Institute (IWMI); Washington, DC, USA: USAID. 209p. (E-flows for the Limpopo River Basin: Report 7) [doi: https://doi.org/10.5337/2022.222]
Environmental flows ; River basins ; Ecosystem services ; Hydrology ; Fish ; Invertebrates ; Riparian vegetation ; Groundwater ; Water quality ; Ecological factors / Botswana / Zimbabwe / Mozambique / South Africa / Limpopo River Basin
(Location: IWMI HQ Call no: e-copy only Record No: H051956)
(5.75 MB)
10 O'Brien, G.; Dickens, Chris; Wade, M.; Stassen, R.; Wepener, V.; Diedericks, G.; MacKenzie, J.; Kaiser, A.; van der Waal, B.; Villholth, Karen; Ebrahim, Girma; Dlamini, V.; Magombeyi, Manuel. 2022. E-flows for the Limpopo River Basin: risk of altered flows to the ecosystem services. Project report prepared by the International Water Management Institute (IWMI) for the United States Agency for International Development (USAID). Colombo, Sri Lanka: International Water Management Institute (IWMI); Washington, DC, USA: USAID. 144p. (E-flows for the Limpopo River Basin: Report 8) [doi: https://doi.org/10.5337/2022.223]
Environmental flows ; River basins ; Ecosystem services ; Risk assessment ; Water resources ; Water quality ; Ecological factors ; Fish ; Cultural services ; Models / Botswana / Zimbabwe / Mozambique / South Africa / Limpopo River Basin
(Location: IWMI HQ Call no: e-copy only Record No: H051957)
(6.84 MB)
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