If you reduce the intake pipe/hose the pump is "starving" for water.If it cant get it in it cant pump it out.If you look at high end pumps they ussually have a bgger intake than discharge port.
Trash pumps will move a certain amount of mud and debries but watch out 1)if it has a plastic impeller it wont last long and 2)its very easy to plug the intake without a pickup screen.I am waiting for rain,waiting,waiting waiting....central texas joke...to try cleaning leaves out of my pond with a pump.Its a 3" honda with a castiron impeller.If we ever get runoff again Ill try it and let yall know the end results.waiting...waiting...waiting... If you try dont forget your discharging leaves,their heavy,pump em where you want em or youll have to rake and move em again. waiting...waiting... waiting

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