Weather & Water Math Center
Measured rainfall, water storage, flow rates and weather unit relationships. 20 tools with purposes, formulas and worked examples.
Simple mode uses starting defaults for extra scenario controls. Advanced exposes those controls where available. Change an entry, then press Calculate.
Complete truth table
Formula, calculation steps & example
All 20 tools: purposes and formulas
- Rainfall over catchment — Use the labeled measurements to calculate rainfall over catchment.
A × B (A, B, C refer to the labeled entries)
- Rain capture share — Use the labeled measurements to calculate rain capture share.
A × B (A, B, C refer to the labeled entries)
- Rainfall depth rate — Use the labeled measurements to calculate rainfall depth rate.
A ÷ B (A, B, C refer to the labeled entries)
- Hours at rainfall rate — Use the labeled measurements to calculate hours at rainfall rate.
A ÷ B (A, B, C refer to the labeled entries)
- Rectangular cistern volume — Use the labeled measurements to calculate rectangular cistern volume.
A × B × C (A, B, C refer to the labeled entries)
- Vertical water tank volume — Use the labeled measurements to calculate vertical water tank volume.
π × A² × B (A, B, C refer to the labeled entries)
- Stored water runtime — Use the labeled measurements to calculate stored water runtime.
A ÷ B (A, B, C refer to the labeled entries)
- Measured water flow — Use the labeled measurements to calculate measured water flow.
A ÷ B (A, B, C refer to the labeled entries)
- Pumping time — Use the labeled measurements to calculate pumping time.
A ÷ B (A, B, C refer to the labeled entries)
- Pumped volume — Use the labeled measurements to calculate pumped volume.
A × B (A, B, C refer to the labeled entries)
- Water lost from measured difference — Use the labeled measurements to calculate water lost from measured difference.
A − B (A, B, C refer to the labeled entries)
- Measured leak rate — Use the labeled measurements to calculate measured leak rate.
A ÷ B (A, B, C refer to the labeled entries)
- Relative vapor pressure — Use the labeled measurements to calculate relative vapor pressure.
A ÷ B × 100 (A, B, C refer to the labeled entries)
- Measured wind gust factor — Use the labeled measurements to calculate measured wind gust factor.
A ÷ B (A, B, C refer to the labeled entries)
- Air parcel advection illustration — Use the labeled measurements to calculate air parcel advection illustration.
A × B (A, B, C refer to the labeled entries)
- hPa pressure to Pa — Use the labeled measurements to calculate hpa pressure to pa.
A × B (A, B, C refer to the labeled entries)
- Water volume cost — Use the labeled measurements to calculate water volume cost.
A × B (A, B, C refer to the labeled entries)
- Entered runoff coefficient volume — Use the labeled measurements to calculate entered runoff coefficient volume.
A × B (A, B, C refer to the labeled entries)
- Tank fullness percentage — Use the labeled measurements to calculate tank fullness percentage.
A ÷ B × 100 (A, B, C refer to the labeled entries)
- Water use per person — Use the labeled measurements to calculate water use per person.
A ÷ B (A, B, C refer to the labeled entries)
Definitions and source references
Unit definitions and selected model references:
- Virginia Tech: wing geometry and mean aerodynamic chord
- Aircraft Design course: tail volume definitions
- Prusa: filament and printer calculation references
- NIST: SI defining constants
- NASA: aerodynamic lift models
- Horizon Hobby: product and battery documentation
- Smithsonian: Maya calendar units
- NIST: frequency intervals and cents
- NIST: binary prefixes
- NOAA: nautical miles and knots
- RFC 3021: IPv4 /31 point-to-point links
- MDN: exact integer arithmetic
- NIST: international-foot unit conversions
- NASA/JPL: astronomical unit definitions
- NASA: ideal rocket equation
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