Working with 10-3 outdoor electrical wire makes you feel like you need 8 arms...  Remember - all electrical work needs to be up to code, installed by a professional, and inspected. TAs a rule, water and electricity don't mix - so it pays to take every precaution! Some areas, like around the old pond (previous picture) and around the edge of the patio were easy to place conduit, as the areas were already open.  This trench supplies the 12 volt power for 3 underwater lights that were placed under the patio overhang so the pond could be lit up at night! Other trenches had to be dug with a pick axe.  This one will supply the 110 volt power for the pumps.  The beautiful landscape lighting and the underwater lighting are the icing on the cake!  Given the electrical for the pumps was required, the incremental cost was low compared to the enjoyment it produced! This wire is heavy, and does not like to go around corners - especially if there is more than 1 wire in the conduit! The attachment to the house was carefully planned, and 2 new 20-amp ground-fault circuits were installed just for the pond!  The last trench brought 110 volt power to the pole light, and a large underwater light which brightens the deep area of the pond. The electrical service culminated in 3 boxes.  Each contained plugs and switched plugs (see diagram below).  There was also a timer switch for the sump pump (used for water changes) which insures that the pond is never pumped dry. Electrical for: 3 pumps (2 on the big pond, 1 for the old pond) 2 Ultra Violet lights (1 for each pond - they keep the water from getting green by reducing algae), 1 pump for the weeper hose (between the ponds - makes it look like the little pond spills into the big pond), 1 timer switch for the sump pump and a spare outlet. The second pump on the large pond and the weeper are on switches so that energy can be conserved when no one is around to enjoy it!  The back of the mounting board holds the transformer for the 12 volt landscape and underwater lights. These are controlled by a light sensor that turns them on at dusk, and off 4 hours later.  The rest of the lights are connected to a switch in the house.