Details of Waterbeach Plume Plotter

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

Stacks and buildings

Building measurements are taken from [2]. This image shows the layout of the stack and building modelled. North is at the top; colours and numbers indicate the height of the buildings and the stack:

Stack measurements

These are taken from [2]. Note that the two flues are combined into a single larger stack here:

The following values are used for albedo, Bowen ratio and roughness length. Roughness length is as specified in [2]:

Emissions

The emission rates of pollutants are taken from [2]:

PollutantEmission rate
per second
Oxides of nitrogen10.7 g
Sulphur dioxide2.676 g
Carbon monoxide2.676 g
Particulates535.1 mg
Hydrogen chloride535.1 mg
VOC535.1 mg
Hydrogen flouride53.51 mg
Ammonia535.1 mg
Mercury2.676 mg
Cadmium and thallium2.676 mg
Other metals26.76 mg
Dioxins and furans5.351 ng
Benzo(a)pyrene11.23 μg
PCBs267.6 μg

Background levels

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

PollutantBackground
concentration per m3
Oxides of nitrogen15.08 μg
Sulphur dioxide8.67 μg
Carbon monoxide315 μg
Particulates18.36 μg
Hydrogen chloride710 ng
VOC400 ng
Hydrogen flouride2.35 μg
Ammonia2.9 μg
Mercury2.43 ng
Cadmium and thallium300 pg
Other metals30.09 ng
Dioxins and furans33 fg
Benzo(a)pyrene140 pg
PCBs127.5 pg

Weather data

Weather data is taken from METAR reports from a local airport: Cambridge.

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

References

1. Environmental Statement V3 App 8.1: Baseline Review. Fichtner. October 2017.

2. Environmental Statement V3 App 8.2: Process Emissions Modelling. Fichtner. December 2017.