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The Komati River Basin is a trans-boundary watercourse shared by the Republic of South Africa (RSA), the Kingdom of Swaziland (KoS) and the Republic of Mozambique. The Komati Basin Water Authority (KOBWA) is charged with the management of the river basin under a treaty signed between RSA and Swaziland of which consent was given by Mozambique in a separate Agreement. KOBWA developed Decision Support Systems (DSS) to manage the system. These include DSS for: (i) long-term water allocation (yield model) between the countries, (ii) short-term water allocation (rationing model), and (iii) day-to-day water release (hydraulics model). An extensive water-monitoring program has been put in place to improve the effectiveness of these DSSs. There has been a wide acceptance of the DSS by the users in the basin since the DSSs enable water users and water managers to make transparent water management decisions. This paper describes the three DSSs including the institutional framework on which these are applied.

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