What is the head loss found in a rapid sand filter?

Which of the following is not true in case of closing the top of the vessel?

Filter cycle is interrupted for __

Calculate the diameter of a multimedia filter with the following data. Flow: 2200 m3/hr Velocity: 18 m/hr

While designing a blower for backwash for sand filters with air scouring what is the velocity considered?

What is the effective size of sand used in rapid sand filters?

For rock packing low- rate trickling filters what is the hydraulic loading assumed?

While designing an HRSCC what is the detention time assumed for the draft tube?