do a search for each of "pond""aquaponic""gley"
there are good threads that answer this question.
H Ludi Tyler wrote:
Sealed ponds for wildlife or aquaculture may be a fine idea, but these are not useful for drought prevention in my opinion, because they hold water until it evaporates rather than letting it percolate into the soil.
I'm glad you mentioned about the sunlight, because it occurs to me there may be a natural solution right on our property.
We have a section of cedar forest that floods in the spring after the snow melt. I am wondering if I just dig it down a few feet to the water line if clay will even be necessary?