Got the pipe cleared down at the pond.  Don't know who/what piled the mud on it, but I'm sure glad there's a "cage" covering the top (otherwise the mud would have been down IN the pipe, totally clogging it and a bitch to clear).  It took a while to get it all cleared 'cause it was totally covered.  For whatever reason clearing it did help the back problem.  I further helped it by relaxing and mostly knitting the rest of the day.  Watched an outstanding program about the Galapagos islands.  Never knew there is a "hot" spot in the eastern Pacific ocean.  If it should come on again (National Geographic channel) it would be worth your time.
I believe the silt is building up on the bank of the pond.  The overflow pipe is much closer to the bank than it was before.  Will definitely have to do something about that either late fall or early spring.  It also looks like the carp are doing their job.  Of course it may all be an illusion but I could swear there are fewer lilypads in the pond and more in the mud pile around the pipe "cage".
Y'all have a perfect day and remember:  Whether you think you can or you think you can't....you're right.  (Henry Ford)