If you plan on digging a large pond, you need to make sure you are doing it properly so it doesn't collapse on itself and adds beauty to your landscape. Here are some important tips to know before digging a large pond.
To clean the water and remove old, stale water, add a filter when you are digging a large pond. With all that area, the pond is bound to get dirty, and you don't want your pond turning into a toxic mess, so add a filter making it easy to constantly clean the pond.
If there's no running water going through your pond and you can't find a way to make that happen, you will need to add a water pump to make sure you are supplying fresh water to the pond. Your pond should regularly have new water added for optimal health.
Make sure your dig your pond in a place that is most aesthetically pleasing, and causes the least trouble. You clearly don't want to dig a pond into the side of a rock wall or dirt wall, but would rather dig in a more open space. Also, be sure not to dig your pond near trees or large plants which will have falling leaves that may go into the pond, making cleaning the pond a nuisance.
For a beautiful and large pond, you want to consider its shape before digging. Small ponds can easily be dug up some more if you wanted to change their shape, but as ponds get bigger, it is a lot more work to dig more to amend its shape, especially after you have filled it with water.
You have to consider how the environment may be affected by the pond you will build, especially if you have to dig up a lot of land and install a lot of piping. Make sure that building the pond is feasible before you start digging.