One can make a garden pond / koi pond that generally ranges in size from 150 gallons to around 10,000 gallons. However, if evaporation exceeds the amount of water added, the pond may dry out during summer. This is not harmful biologically because many freshwater plants and animals (perhaps half of all species) are well adapted to periods of drought, and worldwide so-called 'temporary ponds' (ponds which usually dry out once a year) are an important natural habitat type. However, in a garden, a pond which dries out in summer may be a bit disappointing for the owner since this is the time when most people will be spending time enjoying their pond. And of course some animals, particularly fish, cannot survive periods of drought. Amphibians, on the other hand, often benefit from ponds which dry out because this removes fish, the major predators of tadpoles and newtpoles and, provided the larvae emerge before the pond dries out, the drought presents no problems for the amphibians.