The Hopkinson-Cranz Scaling Law Weight equation estimates the appropriate weight of explosives that can be stored at a set distance (r) from people and buildings as designated by the Distance Coefficient (z). This is used when dealing with ammunition management. 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 Law5 6, 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.
Examples of coefficients used in the field: