Spillways

Migrating smolts can pass over a spillway, fall into the pool of water below, and then continue their journey downstream.

Spill deflectors are sometimes used to reduce the effect of total dissolved gas, or TDG. This happens when water plunging into the pool below collects air and becomes supersaturated with nitrogen. This can cause gas bubble disease in fish, which has the same effect as divers suffering from the bends.

Return to Beginning

Next Slide >