The best position in your garden for a pond is one that you can enjoy the most. However the amount of light the pond receives is a factor on how well the pond will do. A spot in full sun or full shade will have undesirable effects. Six hours of light will be sufficient for plants and fish. If your pond is in full sunlight you should consider the use of a shade sail or be prepared to invest in an Ultra Violet Light that will reduce the sun’s effect on algal blooms. You may be able to create shade with consideration of taller surrounding plants and taller shade producing rushes.
Ground levels are a factor when considering where to place your pond. Level ground will make it easier to build but for areas with a slope, you can build up your levels using excess soil that you remove from the pond site. Keep in mind to retain soil from being washed into the pond.
Water Run off needs consideration, the run off will pollute a pond every time the gardens watered or it rains. To avoid this, take into consideration the natural fall of the land. Gullies and low spots that will fill with water from heavy rain must be avoided. Garden run off can be redirected through the use of a raised pond edge or drainage placed on the high side of the pond.
Deciduous trees should be avoided near a pond. Leaves will break down in water and release nutrients that feed algae so avoid building your pond directly under large trees that drop leaves and flowers. Root damage can also be avoided by staying well clear of trees. If you have a leaf problem, try using an internal pond skimmer to collect the falling leaf litter.
Power is needed to operate pumps, filters and lights. Most pond pumps come with a 10m lead but you may need to get power moved to your pond; if this is the case please use a qualified electrician. If power is unable to be installed to the desired location you could consider using a Solar Pump – See Solar pond pumps
Ground substrates will determine in which way you build you pond. Sandy soils may need to be stiffened using a sand cement mix, Clay is ideal for shaping the perfect pond and may need no more preparation than using some pond liner underlay. Rock is the least desirable substrate to be digging in, so if you do hit rock; make sure all sharp edges are removed, add some protection with some fine sand and use pond liner underlay.