Go look at the Waynepumps.com site. That 10 foot reduction in flow is the discharge head, not the length of run. Mind you Snrub is right in that a high velocity run will be lossy and can be converted to head loss values. It says it can connect to a 3/4" garden hose- if you adapt to some 1" poly line, that would be better and cheaper.
All that said, if you have elevation changes like up over the dam and other contours, you could still end up with 10' of head. That 1/6 hp isn't much oomph.
It also says it sucks down to 1/8" from the bottom surface. Be mindful of giving it a clean surface to suck off of.
