Master the Flow: Ace Your 2026 Water Distribution Manager Greenbook 2 Exam!

Stratification in storage tanks happens when water of different temperatures or densities forms distinct layers, with the lighter, warmer water on top and the denser, cooler water below. The most effective way to minimize this is to create circulation that blends the contents and to control how quickly new water enters and old water leaves the tank. Mixing or jetting to disrupt layers physically homogenizes the tank, while placing inlets and outlets to promote sensible flow patterns encourages continual mixing and prevents stagnant pockets. Keeping an appropriate turnover rate ensures water is refreshed often enough so layers don’t have time to stabilize, maintaining uniform temperature and quality throughout.

Relying on uniform temperature alone doesn’t guarantee mixing, and external heating can be energy inefficient and still allow layering if circulation isn’t ensured. Filling slowly without management likewise gives stratification time to develop. So combining active mixing or well-designed inlet/outlet flow with a proper turnover rate provides the best way to keep the stored water uniform.