(or do you want a fish pond?)
Wildlife ponds need different requirements in terms of depth and
filtration from goldfish ponds and ponds for Koi carp. Remember - the fish will eat your tadpoles, tiny
froglets and other water creatures! So, decide what type of pond you
want before you go any further.
Wildlife ponds need to be about 18" deep, fish ponds are
better with a depth of at least 2 ft. preferably more to protect
the fish during icy conditions. Our pond is only about 9 ft x 6
ft, but now that it's established it supports a wide variety of
pond life, plants, visiting birds, bats and badgers.
Build your wildlife pond with varying depths and gently
sloping sides. This allows small creatures to enter and exit
the pond, frogs to lay their spawn (they prefer shallow water
for spawning) and enables both large and small birds to drink
or bathe in your pond.
Wildlife pond building - This is page 2 of 8
Goto:- Pond building pages 
Pond plants  
Frogs, frogspawn & tadpoles - page 
For information on creating a pond for Koi carp visit the Garden Pond Forum