Hi Rhoda,
Another good place for water in period 8 is in the south west.

The reason for this is that in period 8, the wang energy comes from the north east. In doing so, it passes through the house and leaves from the south west. If we put water in the south west, the wang energy is caught so that it can enhance wealth.

Obviously in the next 20 year period (period 9 starting in 2024), the wang energy will come from the south, so we would put water in the north at that time.