Have a small creek that runs into the pond 8 months a year but during the dry season the 20m x20m pond shrinks to around 10mx10m and some fish died last year which was unpleasant to cleanup.  Could I just tap into the ground water and keep the pond full year around?  Not worried about the electrical cost of the pumps because I have excess solar.  Is this something I can do myself or is it something that would require a local "pump" guy.  I would rather not advertise I'm tapping into the ground water but many are up stream of us so probably not an issue.

 

Below are some pics of the inlet creek when it is running and when it is dry ( ~4 months).

 

Fish dying during hot weather will often be due to a lack of oxygen in the water. Pumping up ground water should be combined with some kind of aeration, like a fountain, or a solar paddle wheel thingy like you see in public parks. Hope that helps.