Work out nitrogen loading instantly with clear inputs, formula shown and shareable results.
Nitrogen load is flow times concentration, and annualising it lets the discharge be compared against a catchment loading target expressed in kilograms per hectare per year. Nutrient-sensitive catchments often operate loading caps or trading schemes, so headroom rather than concentration determines whether growth can be accommodated.
Nitrogen load
Load (kg/day) = flow x total N / 1000; annual = daily x 365
Area loading
Area loading = annual load / catchment area
Catchment nutrient budgets and neutrality requirements are set by environmental regulators and planning authorities. Confirm the applicable methodology.
Because eutrophication risk relates to nutrient input per unit of catchment or waterbody area. It allows point and diffuse sources to be compared on a common basis.
A requirement that new development must not increase catchment nutrient load, met by offsetting through treatment upgrades, land use change or credit purchase. It has become a binding constraint on housing in some sensitive catchments.