ISO/TS 24522:2019
(Main)Event detection process: Guidelines for water and wastewater utilities
Event detection process: Guidelines for water and wastewater utilities
This document provides guidance for water utilities on the detection and classification of water and wastewater events. The following subjects are within the scope of this document: — publicly and privately owned and operated water utilities. It does not favour any particular ownership or operating model; — all aspects of the drinking water system and the wastewater system; — all causes of abnormal changes in water and/or wastewater service provision capable of detection by monitoring systems including accidents, unexpected operational changes, natural hazards and intentional disruption. This document is independent of the measurement methods used to collect the data. The document focuses on events which could imminently affect the water utility's interested parties. The following are outside the scope of this document: — methods of design and construction of drinking water and wastewater systems; — plumbing and drainage systems not under the control of the water utility. This document does not include details about action taken as a result of event detection. For such details see ISO 24518 and EN 15975 Part 1.
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General Information
Standards Content (Sample)
TECHNICAL ISO/TS
SPECIFICATION 24522
First edition
2019-02
Event detection process: Guidelines
for water and wastewater utilities
Reference number
©
ISO 2019
© ISO 2019
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ii © ISO 2019 – All rights reserved
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principles of an event detection process . 5
4.1 Design phase . 5
4.1.1 General. 5
4.1.2 Influence matrix table and EDP . 6
4.1.3 EDP inputs . 7
4.1.4 EDP design . 7
4.1.5 EDP target service level design . 8
4.2 Detection phase . 8
4.2.1 General. 8
4.2.2 Validation process . . . 8
4.2.3 Further event monitoring . 9
4.3 Ongoing activities . 9
4.3.1 Post-event EDP evaluation . 9
4.3.2 Periodic reviews . 9
4.3.3 Validation of links between phenomena and risk materialization .10
4.3.4 Estimation.10
4.3.5 Decision-making .10
4.3.6 Guidance on interpretation .10
5 The event detection cycle and the role of the EDP .10
5.1 The EDP's application of the event detection cycle (the EDP cycle) .10
5.2 Development and regular review of an EDP-based event detection capability .11
5.2.1 General.11
5.2.2 Listing of possible event indicators .12
5.2.3 IMT establishment . .12
5.2.4 EIT establishment .12
5.2.5 IMT and EIT periodic review .12
5.3 Deployment of an event detection procedure .12
5.3.1 General.12
5.3.2 Defining the possibility of an event's occurrence .13
5.3.3 Nature of water/wastewater measurement sampling considerations .13
5.3.4 Results assessment .13
5.3.5 Missing inputs .14
5.3.6 Unfamiliar combination of inputs .14
5.3.7 Deviation from normal frequency detection .14
5.3.8 Measurement grouping .14
5.4 Classification of events and evaluation of the classification procedure .14
5.4.1 General.14
5.4.2 Process-based classification .15
5.4.3 Actual classification .15
5.4.4 Assignment of weights .16
5.4.5 Frequency calculations .16
5.4.6 Classification efficiency estimation .16
5.4.7 Classification evaluation .16
5.5 Notification to relevant personnel/systems .16
5.6 Documentation of events .16
5.6.1 General.16
5.6.2 Time stamps.17
5.6.3 Subsequent documentation .17
5.6.4 Responsible person documentation .17
5.6.5 Documentation authority .17
5.6.6 Data security . .17
5.7 Validation process — Periodic evaluation of the detection process .17
5.7.1 General.17
5.7.2 Confidence-level assignment .17
5.8 Periodic system evaluation — System functionality .18
5.9 EDP development — General principles and governance .18
5.9.1 EDP operation .18
5.9.2 Access to the EDP .18
5.9.3 User training and qualification .18
5.9.4 Testing and certification .19
5.9.5 EDP output expression .19
5.9.6 EDP output presentation .19
Annex A (informative) Examples of typical event indicators that could be used as EDP inputs .20
Annex B (informative) Influence matrix table (IMT) .27
Annex C (informative) Event identification table (EIT) .31
Annex D (informative) Examples of statistical methods for the evaluation of event
classification within the EDP .37
Annex E (informative) Signal measurements' grouping .43
Annex F (informative) Verifying the EDP’s response to potential types of events .45
Annex G (informative) Classification of potential events detected .48
Annex H (informative) Event classification performance guide .53
Bibliography .55
iv © ISO 2019 – All rights reserved
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO coll
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