Table 8.4          Details of Aberdeen Tunnel and Ventilation Shafts

Tunnel Length

1.85 km

Carriageway

6.75 m

Height of Ventilation Shaft

5.5 m

Intake Volume of each Ventilation Shaft

212.5 m3/s

Exhaust Volume of each Ventilation Shaft

150 m3/s

Exit Direction

Upward

Exit Velocity

12.6 m/s

Portal Emission for each carriageway direction

29.41% *

            Note: * Calculated based on the given flow rate from Aberdeen Tunnel Management Company.