Experimental research on flow pattern of forebay of side-inlet pumping station

Based on Froude rule, test on a side-inlet pumping station model was conducted with increasing velocity of flow properly. The results showed that: the original scheme would cause a wide range of circulation in the surface layer and bottom layer of the forebay；the side flow deviated badly when the oblique flow get into the intake sump; it would cause sediment deposition easily if the velocity of flow in wing wall’s circulation area was too low. It was bad for safe and economic operation of the pump station. Several measures were used to regulate the flow pattern, including bottom sills, diversion walls, “Y” type diversion pier and “T” type diversion pier which was a variant from the “T” type. The flow pattern could be obtained best with “T” type diversion.

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