A backyard waterfall had been a feature of our house in Newbury Park, and decided to build another on our return to Temecula. We had an idea of what we wanted, then a friend donated a larger pump that enlarged our plans, including the footprint. The angle and design of the upper stream changed, then we tinkered with the block retaining wall multiple times. I dug the hole for the pond and got ready to lay the cushion and liner, but decided to add…