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Rainwater harvesting systems
CSA B805-18/ICC 805-2018 National Standard of Canada
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HUMAN RELATIONSHIP TO THE WATER CYCLE
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Worldwide Water Shortage
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Water Use by Sector
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Water Use by Sector
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Roof Washer/First-
Flush Diverter
Overflow
Storage Tank
Collection Surface (Roof)
Gutter
Debris Excluder
Vent System
Collection Pipe
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RWH: Intersection of Codes
• Building Codes: Gutters, roofing, structural, penetrations• Fire Code: Fire access, cisterns, permissible materials• Electrical Code: Wiring for pumps, controls, sensors• Plumbing Code: Indoor piping, backflow preventers,
meters, filters, valving, tanks, overflows, etc.• Zoning Codes: Tank locations, cross-boundary rainwater
sharing• Health Codes: Water quality, maintenance requirements
But – existing code provisions did pertain to RWH systems.
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Rainwater Collection System Standard Project
• Need for a standard identified in 2011 to meet needs in regulatory arena.
• Joint project by CSA and ICC to develop ANSI and SCC standard for rainwater collection system.
• For use in U.S. and Canada
• Scope• Design, installation, maintenance.• Systems intended to collect, store, treat, distribute,
utilize rainwater.• Potable and non-potable applications.
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Potential Applications for Rainwater
• Potential Applications• Toilet/Urinal flushing• Irrigation• Trap priming• Cooling towers• Fire sprinklers• Ornamental fountains & water features• Potable
• Water quality • Largely set by intended use, local ordinances• Limited code provisions for some applications
• Flushing, irrigation, fire sprinklers, etc.
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ICC/CSA 805 Standard - Approach
• Prescriptive and Performance risk-based approach to water quality.
• Uses Water Safety Plan to identify specific site and application risks.• Differentiation between commercial and residential scale and risk
• Allow for innovation – encompass wide range of technologies, techniques.
• Permits use of broad range of source waters• Includes both potable and non-potable applications
• Coordination with building systems• Coordinated with building codes and national water quality laws
• Use of informative appendices to address best practice and recommendations.
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ICC/CSA 805 Standard - Scope
• Residential, multi-residential and commercial applications
• Potable and nonpotable end uses, except:• Process water systems for industrial or manufacturing
purposes; • Water distribution systems for commercial agricultural
processes
• Rooftop and ground-level collection• Excludes surface water collection (rivers, lakes, streams)• All forms of water from natural precipitation
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Unique Features
• Rooftop and surface-level sources in a single document
• Inclusion of wide range of tank types incl. wood, matrix, precast concrete, flexible
• Addresses rainwater use with fire protection, stormwatermanagement, vegetated roof systems
• Sets water quality criteria for specific end uses based on risk
• Uses Water Safety Plans to address variable site and systems considerations
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Contents1. Scope2. Reference Publications3. Definitions and abbreviations4. Effects of other Codes5. General System Requirements6. System Design and Installation7. Subsystem Design and Installation8. Water Quality9. Rainwater system tests and inspectionsAnnex A – Particle size SpectrumAnnex B – Suggested evaporative cooling water quality control levelsAnnex C – Tank sizing and capacity calculation methodologyAnnex D – Guidance for Developing a Water Safety Plan
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Chapter 5. General System Requirements
BRAE
End use tier categorizations• Potable or non potable water quality• End uses • Potential for human contact
Water Safety Plan
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Risk!?
BRAE
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Chapter 6. System design and installation — General
BRAE
• Materials Compatibility• Operational Conditions• Seismic Considerations• Buried Collection and Distribution
piping• Electrical wiring• Controls• Point of Use Signage
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Chapter 7. Subsystem design and installation
BRAE
• Collection Surfaces• Conveyance Subsystems• Storage Tanks• Treatment and
Disinfection Subsystems• Distribution Systems
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Chapter 7. Subsystem design and installation
BRAE
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Chapter 8. Water Quality
BRAE
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Chapter 8. Water Quality
BRAE
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Chapter 9. Rainwater system tests and Inspections
BRAE
• Testing for non-potable distribution system cross-connections
• First flush diversion test• Collection pipe and vent tests• Tank test• Water supply system test• Inspection and testing of backflow
prevention• Inspection of vermin and insect protection• Water quality
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Questions?
Michelle Britt
Director, Energy Program
International Code Council