Input Parameter

Comment and Assumptions

Value

Unit

Source Type

Area source: It was assumed that emissions from the source are spread over an area

3

m2

Dispersion Coefficient

Urban: The land use has more than 50% of the surrounding area with residential buildings and various commercial activities and also with a population density greater than 750 people/m2

>750

people/m2

Emission Rate

Emission Rate = Cod × Vair,

where Cod is measured odour concentration (ou/m3)

Vair is mean speed of air at exit of vent (m/s)

17,600

ou/m2/s

Source Release Height

The average height of the vent pipes

3

m

Receptor Height

This was set as the average height of the field odour inspectors

1.7

m

Wind Direction Relative to Long Dimension

Measured wind direction with the highest frequency

247.5

degrees

Terrain Option

Simple flat terrain: This was chosen because terrain heights do not exceed stack base elevation

-