Sumps located on the side of cooling tower basins, or any other type of hydraulic structure where opposing flows combine and turn 90-degrees can result in a significant amount of flow separation and energy dissipation at the junction. These separation zones can result in localized regions of higher velocity. If the separation zone is large enough, the flow can approach critical depth. A theoretical method of predicting the size of these separation zones is presented based on the conservation of energy and momentum. To validate the model, the results of an ongoing experimental study are compared to the theoretical predictions. A physical model was constructed and an Acoustic Doppler Velocimeter was used to collect 3-dimensional velocity data within each leg of the junction.

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