You have to work it out after you study the known geology of the area, geological structures, etc

In the older days there was no risk management studies done.

For example, a Major hydroelectric dam was built in northern Canada on bedrock consisting mostly of gneisses rich in pyrrhotite. The construction workers said they were building a dam on a nickel mine! Maybe it is true.

The water draining this rock will be acidic and will also be a hazard to the concrete structure, "eating" it slowly. When I proposed to carry out a study of the area, all parties concerned strongly objected.

If the construction was taking place today, there would have been extensive studies done.

The complexity of geological conditions must be described in numerous quantitative parameters.

The most important parameters of geological processes (genesis and formation conditions of rocks) are:

Pressure (P)

Temperature (T)

Composition of the fluid phase (X-fluid)

Time (t) (time of the rock formation)

Formation age

Deformation (brittle, ductile) (d)

Relations between crystallization and deformation

Furthermore: all technical properties of the respective rocks of the study area (stress, strain, compressive strength, porosity, permeability, water saturation, tensile stress, etc. etc.).

Starting from Grundmann technical approach I suggest to select and define some of those variables (the measurable ones) and to keep in mind that space and time variations (gradients like dT/dx,y,z; dT/dtime, dC/dx,y,z; dC/dtime; dp/dx,dy,dz for example), result more effective than their absolute values to understand and to describe a geologic system and the active processes. 

Thank you all very much for your constructive comments. I learned a lot from them.