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Development and testing of an integrated hydro-economic model
Expanded Title:A major modelling achievement of this project is the linkage of hydrologic simulation with the economic optimisation to quantify possible impacts of changes in catchment water management scenarios on irrigation farming profitability and livelihoods. Through the development of the integrated hydro-economic decision-making framework the research showed that it is possible to replicate the decision-making framework used by DWA to manage water in the Crocodile East catchment. The developed framework proved to be flexible and the researchers were able to incorporate operating rules that were practised in the catchment. Accommodating these operating rules increased the creditability of the results which enhanced participation and discussions about alternative water management scenarios. Strong participation of stakeholders definitely resulted in an improved modelling framework and better understanding of the issues surrounding catchment water management and the implications thereof for water users. The integrated modelling framework hinges strongly on the outputs from the irrigation module to optimise agricultural water use. This was achieved through the development of an FAO 56 based irrigation module that is integrated with MIKE BASIN on a daily basis. The irrigation module was used to provide the inputs for the optimisation model to optimise water use. Further development of the whole-farm SKELETON model was done through the development of state contingent response functions that are able to more accurately model the impact of different levels of assurance of supply. Important to note is that the state contingent approach increased the dimensionality of the programming model to such an extent that it was collapsed into a single annual time period. Thus, the modelling framework does not allow for dynamic changes in irrigators response to changes in catchment management over the long-run. Overall the objectives of the research were achieved to a better than satisfactorily extent. The knowledge that was gained through the development of the integrated decision support system provides the basis for more sophisticated developments to model the impact of changes in water management on irrigation farming profitability over the long-run.
Date Published:01/12/2012
Document Type:Research Report
Document Subjects:Agricultural Water - Small holder irrigation
Document Keywords:Hydrology
Document Format:Report
Document File Type:pdf
Research Report Type:Technical
WRC Report No:1805/1/12
ISBN No:978-1-4312-0385-7
Authors:Grové B; Frezghi M; Pott A; Lecler N
Project No:K5/1805
Originator:WRC
Organizations:Department of Agricultural Economics University of the Free State; DHI South Africa; ZIMBABWE SUGAR ASSOCIATION EXPERIMENT STATION
Document Size:3 505 KB
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