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eng.constructed-wetland-sizing Calculator
Calculates constructed wetland surface area from design flow, pollutant loading, and first-order removal kinetics. Horizontal subsurface flow wetlands have HRT of 4–7 days for nutrient removal — longer HRT and larger area are needed in cold climates due to slower microbial activity.
Inputs
Flow M3 Day
Reference formula or conversion factor shown for context.
Bod In Mg L
Reference formula or conversion factor shown for context.
Bod Out Mg L
Reference formula or conversion factor shown for context.
Temp C
Thermal state of the substance. Check whether the formula needs Celsius, Fahrenheit, or Kelvin (K = °C + 273.15).
Porosity
Amount per unit of time or per unit quantity. Check the denominator before interpreting.
Results
required wetland area (m²)
The computed two-dimensional surface area.
hydraulic retention time HRT (days)
The computed duration or time value.
rate constant kT (day⁻¹)
The value at the specified point or condition.
BOD removal (%)
Reference formula or conversion factor shown for context.