I had to build a terrace to bring in water from the farm field to have an adequate watershed for the size pond I was building (3 acres). So essentially for this portion of the watershed that ends up in the pond there was zero buffer. The water from the field terrace goes through a culvert originally directly into the main pond. Now it goes first to a mini pre-sediment pond (maybe 20' x 40' x 6' deep), then into the sediment pond (about 1/10th acre x 8' deep), then overflows from the sediment pond into the main pond.
So previously I had essentially no buffer, now I have two small ponds the water passes through before it gets to the main pond.
Normally tannin is not an issue from the field. Mostly sediment when we have heavy rains after tillage and sometimes nutrients. This just happened to be a situation where we had dead wheat straw at a time of unusual rainfall. We usually are begging for a rain at that time of year so I do not expect tannin to be a regular problem.
