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The Multi-barrier approach is a key paradigm for ensuring safe drinking water in jurisdictions such as Ontario, elsewhere in Canada, and New Zealand. It is defined as, An integrated system of procedures, processes and tools that collectively prevent or reduce the contamination of drinking water from source to tap in order to reduce risks to public health. In Part 2 of his report on the Walkerton Tragedy, Justice Dennis O'Connor discusses five elements of the multi-barrier approach:

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  • Das Multibarrierensystem (auch Mehrbarrierensystem oder Multibarrierenprinzip) ist ein in der Umwelttechnik angewendetes Prinzip, bei dem mehrere nacheinander gestaffelte Barrieren Sicherheit gewährleisten sollen. Das Prinzip wird unter anderem in der Kerntechnik bei der Endlagerung benutzt. Dort dient es der Isolation der radioaktiven Abfälle vor dem Eindringen in die Biosphäre. Entsprechende Systeme bestehen dort aus geologischen Barrieren (v. a. gering durchlässige Gesteinsschichten), geotechnischen Barrieren (z. B. Bentonit als Puffermaterial um die Abfallbehälter) und technischen Barrieren (z. B. die Abfallbehälter). Radioaktive Stoffe müssen alle Barrieren überwinden, bevor sie in die Biosphäre eindringen können. In der Trinkwasseraufbereitung dienen, etwa bei Verwendung von Oberflächenwasser, neben dem Gewässerschutz sechs oder mehr aufeinander folgende Verfahrensschritte dazu, möglichst alle Schadstoffe bzw. Krankheitserreger aus dem Wasser zu entfernen und so die Sicherheit zu erhöhen. Dabei kommt es auf das Zusammenwirken aller Barrieren an; keine Barriere sollte auf Kosten einer anderen vernachlässigt werden. (de)
  • The Multi-barrier approach is a key paradigm for ensuring safe drinking water in jurisdictions such as Ontario, elsewhere in Canada, and New Zealand. It is defined as, An integrated system of procedures, processes and tools that collectively prevent or reduce the contamination of drinking water from source to tap in order to reduce risks to public health. In Part 2 of his report on the Walkerton Tragedy, Justice Dennis O'Connor discusses five elements of the multi-barrier approach: 1. * Source water protection—Taking action to minimize adverse impacts on source waters reduces the risk from pathogens and chemical pollutants in that water, and can also reduce the degree of treatment required. 2. * Robust water treatment—Having treatment trains with more than one step provides redundancy against treatment failure. 3. * A secure water supply network—Providing a disinfectant residual to the extreme points of the distribution system protects against water quality degradation and microbial intrusion. 4. * Monitoring programs—Monitoring water quality at each of the above points (source, treatment plant, and tap) allows the treatment process to be adjusted to deal with fluctuations in water quality and ensures that the drinking water is safe at the point of human consumption. 5. * Prepared responses to adverse conditions—Having response plans (for example, issuing a boil-water advisory) in place provides a final barrier to protect the public if harmful contaminants should make it through the other barriers. The holistic perspective of the multi-barrier approach also incorporates many players into the goal of keeping drinking water safe. These include managers, researchers, regulators, legislators, and the public. (en)
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  • Das Multibarrierensystem (auch Mehrbarrierensystem oder Multibarrierenprinzip) ist ein in der Umwelttechnik angewendetes Prinzip, bei dem mehrere nacheinander gestaffelte Barrieren Sicherheit gewährleisten sollen. (de)
  • The Multi-barrier approach is a key paradigm for ensuring safe drinking water in jurisdictions such as Ontario, elsewhere in Canada, and New Zealand. It is defined as, An integrated system of procedures, processes and tools that collectively prevent or reduce the contamination of drinking water from source to tap in order to reduce risks to public health. In Part 2 of his report on the Walkerton Tragedy, Justice Dennis O'Connor discusses five elements of the multi-barrier approach: (en)
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  • Multibarrierensystem (de)
  • Multi-barrier approach (en)
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