My friends 1/2 acre pond has dropped 5ft. We tried dye to locate the leak but no luck. The thought is to drain it while we are in a drought condition here in Western PA, but I would like to have an idea on where to start looking. Does anyone have some guidance/steps on how to isolate the location of the leak? We do not have the money to put in a liner. As always your help is greatly appreciated.

Also, if there is any guidance on how to go about repairs, after draining, and what recommendations on updating while drained are also appreciated.