CSA B805:22/ICC 805:2022

Preface

This is the second edition of CSA B805/ICC 805, Rainwater harvesting systems. It supersedes the previous edition published in 2018.

Changes to this edition include the following:

a) updated referenced standards throughout the Standard;

b) added definitions for Make-up system and Bypass system;

c) editorial revisions to clarify requirements in some clauses;

d) changed requirements for UV system filtration in Clause 7.4.4.2.3; and

e) minor revisions to equations in Annex C.

This Standard was prepared by the Joint Technical Committee on Rainwater Collection Systems, under the jurisdiction of the CSA Strategic Steering Committee on Construction and Civil Infrastructure and the ICC Codes and Standards Committee, and has been formally approved by the Joint Technical Committee.

This Standard has been developed in compliance with Standards Council of Canada requirements for National Standards of Canada. It has been published as a National Standard of Canada by CSA Group.

This Standard has been approved by the American National Standards Institute (ANSI) as an American National Standard on December 8, 2022.

Scope

1.1 Inclusions

1.1.1 Applicability

The provisions of this Standard apply to the design, materials, installation, and operation of rainwater harvesting systems for potable and non-potable applications.

1.1.2 Source waters

This Standard covers the use of rainwater and stormwater as the source water.

Note: Rainwater includes all forms of water from natural precipitation including but not limited to rain, snowmelt, etc. The term rainwater harvesting is used generically in this Standard and can refer to harvesting of either roof runoff or stormwater.

1.1.3 Applications

This Standard covers rainwater harvesting systems that provide water for

a) single-family residential applications;

b) multi-residential applications; and

c) non-residential applications.

1.2 Exclusions

This Standard does not cover

a) rainwater harvesting systems that provide water for

i) process water systems for industrial or manufacturing purposes; and

ii) water distribution systems for commercial agricultural processes; and

b) collection of surface water.

1.3 Terminology

In this Standard, shall is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the Standard; should is used to express a recommendation or that which is advised but not required; and may is used to express an option or that which is permissible within the limits of the Standard.

Notes to tables and figures are considered part of the table or figure and may be written as requirements.

Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.

1.4 Units of measurement

The values given in SI units are the units of record for the purposes of this Standard. U.S. customary units given in parentheses are for information and comparison only.

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