Details of Allerton Plume Plotter

This page should be read in conjunction with How Plume Plotter Works. It provides more details specific to the Allerton version of Plume Plotter.

Stacks and buildings

Building measurements are taken from [1].

The image below shows the layout of the stacks and buildings modelled. North is at the top; colours and numbers indicate the height of the buildings and the stack:

Stack measurements

The two stacks are modelled as a single stack, following [1]:

• Stack location: 54.033227,-1.3820148.
• Stack height: 70 m.
• Stack diameter: 2.5 m.
• Stack gas exit velocity: 15 m/s.
• Stack gas temperature: 130 °C.

The following values are used for albedo, Bowen ratio and roughness length. Roughness length is as specified in [1]:

• Albedo: 0.25.
• Bowen ratio: 0.75.
• Roughness length: 0.3.

Emissions

The emission rates of pollutants are of two types. The planned emission rates are as given in [1]. They are listed below:

The actual emission rates are the annual average for 2023, as reported in the incinerator's annual emissions report. They are listed below:

Background levels

The background levels of pollutants are taken from [1]:

Weather data

Weather data is taken from a local synoptic weather station: Topcliffe.

Upper air data is the latest reported by the Albemarle upper air station.

References

1. Environmental Statement Chapter 10. Amey Cespa. July 2011.