a spring fed pond will have a water flow, it will be constant.
digging a pond in to the water table will not have a flow. wich mean no exchange of water to keep it fresh and oxigenated. a pond dug in the water table will go up and downwith the water table in the area. I have seen water tables raise and fall as much as 10 feet in one season. Rains and Drouts extreamly affect water leves in these types of ponds.
one of the major problems with small ponds is they cant get enough oxigen, True plants will help, but in the late july in to agust there is a few weeks there that the plants will absorb oxigen.
Most lakes get their oxigen via wind and rain, but since small ponds dont have a big enough surface area they dont get the oxigen needed.
In the winter lack of oxigen is a serious problem when the water is not deap enough or is spring fed, that is why bubblers or fountains are used to keep the water oxigenated.
with out oxigen, fish litterly do drown in the water.
something as simple as a submercable sump pump with a fountan head or a hose nosle or sprinkler head on top will work fine.
You can go dig up a lilly pad and introduce it to your pond. or you can order from the
The reason I suggested on pair of Yellow Bullheads is because they will eat fish food and they will pick up the fish and eat them as they die off, "you will have a few fish die on you, it is inevitable. you will need a cleanup system and a pair of bull heads is just what the pond doc ordered.[

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