Sorry to hear the goose plague descends upon your Kangkong / Ipomoea aquatica every time it starts getting going. Its a favorite of mine.
As long as there remains water shallowly below the surface (even if the visible pond dries up during drought) you could grow Cattails. The pollen gathered from the male parts in the Spring is enjoyable, can be put into pancakes and be made into fritters, and the "heart" of it down low where the leaves generate from is edible, as are the rhizomes.
Cannas (of the right sorts) have edible young shoots and the rhizomes are starchy and a bit crisp in texture. Could plant them along the borders. Same deal with the water table - as long as it remains accessible to their roots, they're good.
There are a lot of fern species that also like to grow alongside watery places. I haven't intentionally cultivated any of these myself, but that's something to look into potentially.
Elderberry, also! It likes moist soil, and in the right parts of the world can be found growing along rivers, streams, seasonal creeks, etc. It needs to be a bit back and elevated over the nearby water source.