Reference library
Sources and Further Reading
Primary and authoritative references used to set definitions, formulas and safety boundaries.
These resources are starting points rather than substitutes for current local requirements. External documents can be revised or replaced.
- EPA WaterSense — Irrigation Best Management Practices
- EPA WaterSense — Irrigation Professionals
- OSHA — Landscape and Horticultural Services
- CCOHS — Landscaping: General
How sources are used
Recognized definitions and standard mathematical relationships may inform calculator explanations. Local prices, legal requirements and organization-specific targets are generally left as user inputs.