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the hieght of the drop is the thing that needs to be worked out a regular pump will do but it will need a high lph rating youi will then need to construct the slope and the pond then purchases some plastic tubing that will fit the outlet of tyhe pump and lead this from the pump which will be placed in the pond to the head of the stream then disguise the piping and turn on the pump ensure that the pond can take the excess water that will be in circulation when the pump is turned off so that the pond doesnt overflow
I was hoping to find a recommended pond bottom profile. The information seems to be somewhat lacking on the internet
Purbeckboy, Type pond profile into google and you should get a link to Cheshire Wildlife trust fact sheet on ponds. It has some good info including the sort of pond profile you need.
In essence it is just a case of having a 'sump' in the pond, the center deeper than the rest.There are several reasons why this is good for different species of wildlife, but as a practical gardening consideration, it gives somewhere to put plants that like deeper water. It is usually achieved by having shelves around the edge, which automatically gives you the deeper middle.
Here are a number of youtube videos which sort of outline exactly what your looking for: