§ Mr. Newensasked the Secretary of State for the Home Department what blast overpressures were taken as a basis for the civil defence exercise Exercise Square Leg in London.
§ Mr. MayhewThe London civil defence scientific advisers who participated in the military home defence Exercise Square Leg had access to the operational handbook for scientific advisers supplied by the Home Office to local authority scientific advisers.
Sheet B5 of the handbook permits calculation of the ranges at which certain blast overpressures would result from various yields of weapon. The following table illustrates these calculations: 404W
Ranges in Kilometres Weapon Yield in Megatons Ground Burst Air Burst, at Height to Maximise Range of 6 Pounds per square inch 6 psi 1.5 psi 6 psi 1.5 psi 0.5 MT 3.3 8.0 4.9 12.3 1.0 MT 4.1 10.0 6.2 15.5 2.0 MT 5.2 12.6 7.8 19.5 3.0 MT 5.9 14.4 8.9 22.4 5.0 MT 7.0 17.1 10.6 26.5