Floods are a key category of geologic processes. Parts I and II of this series provided some examples of geologic work by floods and related processes in Central Montana as witnessed by the author and how these may apply to the study of earth history. In Part III, geologic processes associated with these engineering projects are presented that are not flood processes. Evolutionists tend to overlook or resist evidence for catastrophic, large-scale processes (especially diluvial processes), while creationists can be tempted to overlook or downplay the role of smaller-scale processes that are presently active. This is a false dilemma, as these examples illustrate. The problem is one of philosophy and method, not of evidence.