Gee, I typed out a big thing and it disappeared
Not sure of your discription of the waterfall placement.
Are you doing another deck? To you have a drawing
of your future pond.
It's important that the waterfall faces the house.
This is good fung shui...water represents wealth, in order
for money to continue flowing into the house you need the
water to flo towards the house, not away from the house...
When we built our pond, we first layed it out with the bright
orange water hose...we were surprised at how much of the
front of the pond was obstructed from the lower pond deck
that is only one foot off the ground...
So, we then moved the pond out a few more feet.
(I hope this is clear). Also, I saw that the kidney shape was a little
boring, so we just made some in and out -- subtle bumps outs all
around ( as well as a shallow beach section)