Frost free "drain"

Here's the goal:
Geothermal open loop water-to-water system using well water and discharging effluent to pond.
One option is to bury a 1" drain line below frost depth from building to pond. Distance = 150'. Problem is the soil is very sanding and too many obstacles to dig under.
Other option would be for effluent to feed a water feature near building with a man made raceway to the pond. This would be easier and cheaper to construct. Issue is preventing a freeze up where effluent leaves building or ice accumulation that would eventually block flow.
I have to keep the drain line no smaller than 1".
Would a anti siphon device work? It would seem that such a device would allow the last few critical feet of the line to drain when the water flow is cut off.
Ideas? Suggestions? Improvements?
Thanks.
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does the pond have a drain, to saay a creek? if not it will overflow.
might be easier to drill a sevcond well nearby and send the water back down.
besides this way you wouldnt exhaust your well........
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On Mon, 19 Nov 2007 14:32:11 -0800, snipped-for-privacy@aol.com wrote:

Pond has sufficient space and depth to handle effluent.
It is not always acceptable to have a second well for this type of system. In fact, in this state it is not permitted.
There's no way to exhaust the well.
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