Coping with droughts and floods: A Case study of Kanyemba, Mbire District, Zimbabwe

Bola, Gode B.; Mabiza, Collin; Goldin, J.; Kujinga, Krasposy; Nhapi, Innocent; Makurira, Hodson; Mashauri, D.A.

doi:10.1016/j.pce.2013.09.019

Cited by 50 publications

(46 citation statements)

References 6 publications

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“…Communities in Zimbabwe have been affected by climate change related disasters such as the droughts of 1982, 1991–1992, 1994–1995, 1997–1998, 2002 and 2008 (Bola et al 2014). In addition, Zimbabwe was also affected by the El-Niño phenomenon, which resulted in the floods of 1997–1998 (Dilley 2000).…”

Section: Impact Of Droughts and Floods On Food Securitymentioning

confidence: 99%

Regional disaster risk management strategies for food security: Probing Southern African Development Community channels for influencing national policy

Tirivangasi

2018

Jàmbá

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Natural disasters and food insecurity are directly interconnected. Climate change related hazards such as floods, hurricanes, tsunamis, droughts and other risks can weaken food security and severely impact agricultural activities. Consequently, this has an impact on market access, trade, food supply, reduced income, increased food prices, decreased farm income and employment. Natural disasters create poverty, which in turn increases the prevalence of food insecurity and malnutrition. It is clear that disasters put food security at risk. The poorest people in the community are affected by food insecurity and disasters; hence, there is a need to be prepared as well as be in a position to manage disasters. Without serious efforts to address them, the risks of disasters will become an increasingly serious obstacle to sustainable development and the achievement of sustainable development goals, particularly goal number 2 ‘end hunger, achieve food security and improved nutrition and promote sustainable agriculture’. In recent years, countries in southern Africa have experienced an increase in the frequency, magnitude and impact of climate change–related hazards such as droughts, veld fire, depleting water resources and flood events. This research aims to reveal Southern African Development Community disaster risk management strategies for food security to see how they an influence and shape policy at the national level in southern Africa. Sustainable Livelihood approach was adopted as the main theoretical framework for the study. The qualitative Analysis is based largely on data from databases such as national reports, regional reports and empirical findings on the disaster management–sustainable development nexus.

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Section: Impact Of Droughts and Floods On Food Securitymentioning

confidence: 99%

Regional disaster risk management strategies for food security: Probing Southern African Development Community channels for influencing national policy

Tirivangasi

2018

Jàmbá

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“…1). Mbire District receives low rainfall of below 600 mm and lies in agro ecological region IV of Zimbabwe (Bola et al, 2014). The district records high temperatures (sometimes exceeding 40 • C) with mean annual temperature of 25 • C, Mbire District lies on sedimentary geological foundations of lime and sandstone formations.…”

Section: Study Areamentioning

confidence: 99%

“…Mbire District experiences frequent localised flooding (CPU, unpublished data, 2015). Backflow from the downstream Cahora Bassa Dam and rainfall events from the large upstream catchment are the two main factors that contribute to flooding (Bola et al, 2014). Angwa, Manyame, Musengezi sub-basins have been selected since these are the major rivers in the area and greatly contribute to flooding (Bola et al, 2014).…”

Section: Study Areamentioning

confidence: 99%

Evaluation of sub daily satellite rainfall estimates through flash flood modelling in the Lower Middle Zambezi Basin

2018

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Abstract. Flash floods are experienced almost annually in the ungauged Mbire District of the Middle Zambezi Basin. Studies related to hydrological modelling (rainfall-runoff) and flood forecasting require major inputs such as precipitation which, due to shortage of observed data, are increasingly using indirect methods for estimating precipitation. This study therefore evaluated performance of CMORPH and TRMM satellite rainfall estimates (SREs) for 30 min, 1 h, 3 h and daily intensities through hydrologic and flash flood modelling in the Lower Middle Zambezi Basin for the period 2013-2016. On a daily timestep, uncorrected CMORPH and TRMM show Probability of Detection (POD) of 61 and 59 %, respectively, when compared to rain gauge observations. The best performance using Correlation Coefficient (CC) was 70 and 60 % on daily timesteps for CMORPH and TRMM, respectively. The best RMSE for CMORPH was 0.81 % for 30 min timestep and for TRMM was 2, 11 % on 3 h timestep. For the year 2014 to 2015, the HEC-HMS (Hydrological Engineering Centre-Hydrological Modelling System) daily model calibration Nash Sutcliffe efficiency (NSE) for Musengezi sub catchment was 59 % whilst for Angwa it was 55 %. Angwa sub-catchment daily NSE results for the period 2015-2016 was 61 %. HEC-RAS flash flood modeling at 100, 50 and 25 year return periods for Angwa sub catchment, inundated 811 and 867 ha for TRMM rainfall simulated discharge at 3 h and daily timesteps, respectively. For CMORPH generated rainfall, the inundation was 818, 876, 890 and 891 ha at daily, 3 h, 1 h and 30 min timesteps. The 30 min time step for CMORPH effectively captures flash floods with the measure of agreement between simulated flood extent and ground control points of 69 %. For TRMM, the 3 h timestep effectively captures flash floods with coefficient of 67 %. The study therefore concludes that satellite products are most effective in capturing localized hydrological processes such as flash floods for sub-daily rainfall, because of improved spatial and temporal resolution.

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“…It has uneven topography with very shallow leptosols and lexisols soils (Bola et al, 2014). The Zambezi River, which forms the northern boundary of the area, is perennial and its flow regimes are, to an extent, dictated by the operation of the hydropower plant at Kariba Dam.…”

Section: Figure 2 Seasonal Rainfall Variability For the Past Two Decmentioning

confidence: 99%

“…In 2010 the area was once again flooded. The occurrence of floods in Kanyemba is also induced by the operation of dams in the Zambezi River Basin (Bola et al, 2014). Key informant interviews with staff from Zimbabwe National Water Authority (ZINWA) and Manyame Catchment Council revealed that the floods of 2010 in Kanyemba were due to throwback in the Mwanzamtanda River.…”

Section: Experiences Of Floods On Livelihoods In Kanyembamentioning

confidence: 99%

Analysis of institutional mechanisms that support community response to impacts of floods in the middle-zambezi river basin, Zimbabwe

Muhonda

Mabiza

Makurira

et al. 2014

Physics and Chemistry of the Earth, Parts A/B/C

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Coping with droughts and floods: A Case study of Kanyemba, Mbire District, Zimbabwe

Cited by 50 publications

References 6 publications

Regional disaster risk management strategies for food security: Probing Southern African Development Community channels for influencing national policy

Regional disaster risk management strategies for food security: Probing Southern African Development Community channels for influencing national policy

Evaluation of sub daily satellite rainfall estimates through flash flood modelling in the Lower Middle Zambezi Basin

Analysis of institutional mechanisms that support community response to impacts of floods in the middle-zambezi river basin, Zimbabwe

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