Foreword

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This document was prepared by Technical Committee ISO/TC 224, Drinking water, wastewater and stormwater systems and services.

A list of all parts in the ISO 24566 series can be found on the ISO website.

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Introduction

The occurrence of climate change is recognized globally. Accordingly, mitigation and adaptation programmes have been introduced in many nations, and internationally through a number of agreements.

Locally, operators of water services have had to assess the impacts and options for responding to the effects of climate change, some of which are slow and long-term, while others are acute, arising from extreme weather events and changes.

1 Scope

This document provides guidance and requirements for identifying and assessing impacts of climate change on wastewater systems and on developing strategies for the adaptation to these impacts. The assessment of the impacts is based on the assessment principles described in ISO 24566-1 .

This document also provides examples of some of the impacts of climate change on wastewater systems and of the responses that have been implemented by municipal water services or by the relevant jurisdiction (e.g. municipality or region served by the service). The examples of responses illustrate adaptation strategies that have been applied.

NOTE Both combined and non-combined wastewater systems are included in this document regarding the activities of collection, transport, storage and treatment of wastewater.

2 Normative references

3 Terms, definitions and abbreviations

4 Objectives

5 Impacts of climate change on wastewater systems and responses

5.1 General

5.2 Impacts

5.3 Responses

6 Methodology

6.1 General

6.2 Key functions

7 Assessment of current situation, vulnerabilities and opportunities

7.1 General

7.2 Description and characterisation of the current wastewater system

7.3 Identification and assessment of current climate-related hazards to wastewater services

7.4 Identification and assessment of current system risks and vulnerabilities

7.5 Assessment of current system opportunities

8 Assessment of future situation, vulnerabilities and opportunities

8.1 Identification and assessment of the future climate change hazards

8.2 Identification and assessment of future vulnerabilities to the wastewater system

8.3 Assessment of future opportunities

9 Financial assessments

9.1 General

9.2 Financing adaptation

9.3 Cost-benefit analysis

10 Development of adaptation strategy

10.1 General

10.2 Adaptation strategies

10.3 Assessment of revised system

10.4 Assessment protocols

10.5 Implementation

11 Proposed templates

11.1 Template for response options and actions

11.2 Template for response categorisations

12 Monitor, review and update

Bibliography