Many States use rules based upon the explosives, their quantity, and the distance from the explosive to where people are at risk. These rules are known as Quantity-Distance (Q-D) criteria, and are based on the approach derived from the Hopkinson-Cranz Scaling Law, which is further amended by a range of coefficients. It is the basis of much of the work on the estimation of appropriate quantity and separation distances.
The Hopkinson-Cranz rule allows the scaling of blast data using the cube root law.
Given a coefficient, Z, the equations for this calculation are as follows:
Range = Z * Weight1/3
Weight = (Range / Z)3