| 摘要 |
<p>PURPOSE:To prevent vortex by providing a wall having a water-flow hole at the downstream of pump. CONSTITUTION:A wall 2 having a water-flow hole 4 is provided at the downstream of pumps 1, 5. Consequently, vortex can be prevented easily even when arranging pumps 1, 5 in the direction of water flow, resulting in reduction of installing area and earth work cost.</p> |
