Recently this winter I was out on the farm with a pond excavation contractor and we noticed a bad smell comming from an old underground county drain (1932 clay tile). The tile is broaken up for the most part and the water erupts in various locations durring mid winter and spring when the upstream wetland area gets flooded and the pressere builds up in the line. The smell is like sulfer dioxide or sewer smell? This is a concern as this water will be part of what will end up in my new pond.

The contractor said it was the smell that comes from rotting vegatation and suggested puting in a small shallow pond with a lot of cat tails and other plants just prior to the final discharge to the main pond. Has anyone else run into this problem?

Mike