Until further data is available it can be assumed that the scaled water dimensions for ShotKoa are sufficient for maximum partitioning of energy into the ground. Previous tests conducted with high explosives, Reference 10, show that the crater size can be increased by slightly tamping an explosive that would have otherwise vented to open air. The addition of more tamping had no effect. The cratering efficiency also increased more, percentage-wise, with a tamping or containment of a higher energy-density explosive, C-4, than a lower one, ammonium dynamite. The increase in crater radius of a tamped charge of C-4 to an un- 1 25¢° ‘ 5° NTS soa Original Grater tapering to 3’ at roduis of 4s' ~ is NTS zr, ( soturated) 7 a YH, | ” Crater ofter slides Original Ground Level > . Figure 22 Shot Fig crater profile. tamped was 15 percent, while the increase in radius of tamped to untamped ammonium dynamite was only 10 percent. It is felt, therefore, that a containment factor of approximately 1.3 or 30 percent could be used for low-yield nuclear devices with possibly a slight increase in the factor for larger yields. Crater Dimensions, Shot Fig. [ 31