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Ray F

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**How did you find PF?:**google search

I've worked at sea for a number of years and now I'm particularly interested in learning more about fluid dynamics in order to find practical solutions to environmental problems. I would be very grateful for any advice people on this forum can give me.

At the moment I want to pump water up to the roof of a house. My question is this: will a pump that pumps water 10 meters up a vertical pipe of 10 mm Inside Diameter face less back pressure pumping the same water 10 meters up a pipe of 20 mm Inside Diameter? Or is the back pressure the same? Thank you for your help.