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Risk Based, Site-Specific, Irrigation Water Quality Guidelines: Volume 1 Description of Decision Support System
Expanded Title:The 1996 South African Water Quality Guidelines comprise one of the most widely-used tools in water quality management. However, they are now viewed as significantly out of date. A Phase 1 Department of Water Affairs and Forestry (now Department of Water and Sanitation) project was completed by a panel of experts in 2008 . They performed a needs assessment, developed a general philosophy and described the general specifications of a decision support system (DSS) for revised water quality guidelines for South Africa. The general aim of this project was to develop a software-based decision support system (DSS) able to provide both generic and site-specific risk-based irrigation water quality guidelines for South Africa. The DSS assesses fitness for use and establishes water quality requirements for the effect irrigation water constituents have on soil quality, crop yield and quality, as well as irrigation equipment. For each of these, a number of suitability indicators were identified, as indicated below. The criteria used to determine the fitness for use category of each suitability indicator and the relevant calculation procedures, are presented and elaborated upon. SUITABILITY INDICATORS Soil Quality: Root zone salinity; soil permeability; oxidisable carbon loading; trace element accumulation Crop Yield and Quality: Root zone effects; leaf scorching when wetted; contribution to NPK removal; microbial contamination; qualitative crop damage by altrazine Irrigation Equipment: Corrosion or scaling of irrigation equipment; clogging of drippers. The aim to develop a software-based DSS able to provide both generic and site-specific risk-based irrigation water quality guidelines for South Africa, was successfully completed. The DSS is a user friendly, self-contained system, incorporating the data bases, help files and supporting information that are required to run the DSS. Designing and establishing the DSS was a major undertaking, and as far as could be ascertained, a world first. Further refinement and the need for additional features were identified during the course of the project. These recommendations for further research include enabling the use of time series of water constituent data for analysis.
Date Published:01/07/2017
Document Type:Research Report
Document Subjects:Agricultural Water - Small holder irrigation
Document Keywords:Guidelines
Document Format:Report
Document File Type:pdf
Research Report Type:Technical
WRC Report No:TT 727/17
ISBN No:978-1-4312-0910-1
Authors:du Plessis M; Annandale J; Benadé N; van der Laan M; Jooste S; du Preez, C; Barnard J; Rodda N; Dabrowski J; Genthe B; Nell P
Project No:K5/2399
Organizations:Department of Agriculture, Forestry and Fisheries; University of Pretoria; Department of Water and Sanitation; University of the Free State; University of KwaZulu-Natal; CSIR; Agricultural Research Council
Document Size:1 076 KB
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