If you have small children, be sure to install a strong safety covering, such as a metal grille, over open water. Or avoid the danger and opt for a pebble fountain until they are older.
With a running water feature, you will need a pump. Make sure you buy one with sufficient power for the job, and check running costs. These can vary and may cost as much as several hundred pounds per year. Solar power is an option for a smaller feature, with the obvious advantage of no ongoing costs at all and no wiring issues. Finally, check that your pump flow is adjustable so that you can achieve a musical splash rather than the sound of a donkey relieving itself.
Water will gradually evaporate, especially from a running water feature, so keep be prepared to top up during the summer months.
ABOVE AND BELOW: Hostas and marsh marigold (Caltha palustris) team with ferns to create contrasting shapes and textures; Circular pools with black bases complement the contemporary circular seating area surrounded by multistemmed birch (Betula utilis var. jaquemontii)