Eight real diagnostic scenarios — from a turbidity exceedance to a clogging lift station, an overflowing detention pond, a migrating groundwater plume, chronic low distribution pressure, a BOD violation, spillway erosion, and odor complaints — each worked through symptoms, diagnosis, testing, and resolution.
Bumping a chemical dose or clearing a pump without confirming the actual cause is a guess dressed up as a fix. This module works through eight real diagnostic scenarios spanning process, mechanical, hydraulic, and water-quality causes, each following the same structure: record the symptom precisely, form a diagnosis consistent with those symptoms and nothing else, run a specific test that confirms or rules it out, and only then apply the fix that follows from a confirmed cause.
Every scenario here is built around at least two plausible causes that present identical visible symptoms — the same discipline this program's earlier modules on treatment, hydraulics, and groundwater were building toward, now applied to real field failures rather than a design calculation.