This is the first edition of CSA Z800, Guideline on basement flood protection and risk reduction.
The Guideline was prepared to assist relevant stakeholders in the mitigation of basement flood risk for new and existing National Building Code of Canada (NBCC) Part 9 residential buildings. Development of the Guideline was motivated both by current basement flood risk and by the potential for increased risk in many regions of Canada under changing climate conditions.
The seed document for this Guideline was developed by the Institute for Catastrophic Loss Reduction (ICLR). It is expected that the Guideline will continue to evolve to reflect new technologies and information, and changing practice associated with NBCC Part 9 building construction, urban drainage, and infrastructure management.
We wish to acknowledge the contributions of Norton Engineering, the Institute for Catastrophic Loss Reduction, and the Intact Centre for Climate Change Adaptation during the development of this Guideline.
This Guideline 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 Guideline covers measures to reduce the risks of basement flooding, and to mitigate the adverse effects on property, public safety, and public health in case of a flood event. It covers existing, new, rebuilt, and renovated houses in rural and urban settings.
1.2 Buildings covered
This Guideline covers all types of ground-related houses, with or without basements, that are considered Part 9 buildings according to the National Building Code (NBC) including
a) detached houses;
b) semi-detached houses; and
c) row houses.
Recommendations made in this Guideline are generally appropriate for houses serviced by gravity- based storm, sanitary, combined, or third pipe systems.
1.3 Types of flood hazards
The types of flood hazards addressed by the measures described in this Guideline are
a) overland flooding associated with precipitation events and resulting in the accumulation/ponding of rainwater and/or snow melt in and around ground-related houses;
b) storm and sanitary sewer backwater (surcharge);
c) infiltration flooding (groundwater seepage);
d) plumbing and drainage failures, including failure of sump systems and sewer lateral failure; and
e) flooding associated with improper installation of basement flood risk-reduction technologies (see Annex A).
Note: Users of this Guideline are reminded that any of the provisions outlined herein are subject to existing codes and standards that are applicable in the jurisdiction under which the Guideline user is operating. It is strongly recommended that appropriate licensed professionals conduct any work outlined in this Guideline. All appropriate local, provincial, and national codes and standards must be adhered to in the application of the provisions outlined herein. All appropriate permits and inspections from authorities having jurisdiction must be obtained when undertaking any of the work outlined here.