Plumbing required - urgently.

At the top of the "Waterfall" there are a couple of primulae. 
By my schoolyard latin THAT is the plural. However, look it up as "Plural of primula" and you're offered anything but - not even "Primulas".
"Cowslips, Primroses, Oxlips, even primeroles.
Anyway I turned the falls on to moisten them and totally emptied the pond during the time it ran; hence the need for plumbing; or, more accurately a newer header "Urn".

This BTW was taken some considerable time after I started to slowly refill by trickling the hose into the top "pondlet".
:¬(