I'v got a tricky dam/groundwater question.
I got a large dam made about 10 years ago. Our place is on a slight slope with forest at the bottom and pasture on the upper part of the slope. Above us are large hills and we get plenty of runnoff and springs feeding a very small seasonal creek though our place. When it rains water rushes down the creek into the dam.
Unfortunately the dam never held water and when it filled a "spring" would appear about 50m down from it in the forrest and the dam would empty.
We have red, volcanic subsoil which is very well drained and notoriously poor for dam building.
I recently had the guy who built it come back and attempt to seal it with a huge amount of clay.
I have also tryed to improve the pastures in order to improve water penetration and saturation above the dam.
We have had rain and the creek is flowing. The water just seems to be sinking into the pasture above the dam though and has been for months.
Unfortunately now water is sinking in to the paddocks above the dam and comming out in the forrest below it!
Is there an underground stream flowing under my dam?
I was planning to get the dam rebuilt from scratch if the clay didn't work. Is this a bad idea?