Sources & References
Every calculator and guide on IrrigationForge is built on published professional references: the Irrigation Association, ASCE standardized evapotranspiration, university extension services, manufacturer design manuals and government agencies. This page lists them all and where each one is used.
Reference list
- ASCE standardized reference evapotranspiration (ET0)
Used by: Irrigation Run Time Calculator, Irrigation Water Budget Calculator - EPA WaterSense - outdoor water use
Used by: Irrigation Cost Calculator - Government water agency conservation guidance
Used by: Irrigation Water Budget Calculator, Irrigation Water Use Calculator, Irrigation Cost Calculator, How Much Water Does Irrigation Use? - Hazen-Williams equation, standard hydraulic engineering references
Used by: GPM to PSI Calculator, Pipe Friction Loss Table (PSI per 100 ft) - Hunter Industries pipe sizing recommendations
Used by: Pipe Flow Calculator, Sprinkler Zone Calculator, Sprinkler Head Calculator, Sprinkler Coverage Calculator, Sprinkler Zone Planning Basics, Pipe Flow Capacity Table (GPM by Pipe Size) and 2 more pages - Irrigation Association - landscape irrigation design
Used by: Irrigation Flow Calculator, GPM Calculator, GPM to PSI Calculator, Pipe Flow Calculator, Water Flow Calculator, Sprinkler Calculator and 21 more pages - Rain Bird nozzle performance charts
Used by: Irrigation Flow Calculator, Sprinkler Zone Calculator, Sprinkler Head Calculator, Sprinkler Coverage Calculator, Sprinkler Application Rate Calculator, Drip Line Flow Calculator and 4 more pages - Standard hydraulic flow relationships (continuity equation)
Used by: Water Flow Calculator - University extension guidance on home irrigation audits
Used by: GPM Calculator, Sprinkler Calculator, Irrigation Run Time Calculator, Sprinkler Run Time Calculator, Drip Irrigation Run Time Calculator, Lawn Watering Calculator and 5 more pages
How we use sources
Each calculator's formula traces to a published design manual or standard; each page shows its assumptions and links the sources behind its numbers. When industry guidance changes, we update the affected pages and the "Updated" date in the footer. Results remain planning estimates - field verification is always the final step.