There is an interesting ethical issues that arises in this discussion also. Engineers are entrusted to protect the public health, safety and welfare. When there were few people, projects did not impact many so little thought was given to the “what could possible happen” question. We are still paying for that. When bad things happen, the precedent has unfortunately been set that somehow “the government” will resolve this. An old 1950s BOR director said he thought he was “a hero because he helped create more room for people” in the west with dams and water projects. He did accomplish that, except that while there were more people coming, the resources were never analyzed for sustainability, nor the impact it might have on the existing or potential future economic resources. But once the well runs dry, I think we just assumed that another solution would resolve any issue. But what is if doesn’t?
There are many water supply examples, where we have engineered solutions that have brought water or treated water to allow development. South Florida is a great example – we drained half a state. But no one asked if that development was good or appropriate – we drained off a lot of our water supply in the process and messed up the ecological system that provided a lot of the recharge. No one asked in the 1930 if this was a good idea.
Designing/building cities in the desert, designing systems that pump groundwater that does not recharge, or design systems that cannot be paid for by the community – we know what will happen at some point. Now that there are more people, conflicts become more likely and more frequent. Most times engineers are not asked to evaluate the unintended consequences of the projects they build. Only to build them to protect the public health safety and welfare while doing so, but from a specific vantage point.
So if you know a project will create a long-term consequence, what action should you take? So the question is whether there is a conflict between engineers meeting their obligations to the public and economic interests in such cases? Or should we just build, build, build, with no consideration of the consequences?