This data category is used to input the environmental parameters which are normally constant throughout the analysis of a structure. These parameters include the Acceleration Due to Gravity and the Depth and Density of the water. It is not intended to imply that the user cannot change the depth of water on every single run of the program if he wishes to do so, only that these parameters are classified by the fact that they normally remain constant.

All data records are optional in this data category. Enter NONE for the data category keyword if no data records are input. Please note that the default values for the parameters in this data category are effectively in SI units. This means that if the user is working in a set of units other than SI, he will have to explicitly input all three parameters.