A four-stage (parallel) pump delivers 15 m per minute of liquid The total head obtained is 27m. Initially, the impeller measures 24cm in diameter running at 1950 rpm it is desired to construct a pump at a certain number of stages in series that should run at 1450 rpm delivering 18m3/min with 280m of head in total What should be the new diameter of the impeller and number of stages?

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Storm Sewers and Detention

The storm drains system transports rainwater or stormwater and other runoff from roads, parking lots, and roof downpipes directly to nearby creeks, rivers, or the sea without any treatment.