Posted by Keaven
My city does have a map on-line. It isn't very helpful. As wranglerroadhead said, starting at the outflow is the way to go.
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It usually goes down grade ultimately to a water way of some sort. Find the end is sound advice.
Small underground streams are something found under cities and towns by finding the inflow, above ground sections, or the outflow. These streams may be relatively small about 3-15 feet across, but still have a large tunnel to support water high volumes. These will always come out at a lower elevation. Topographic maps can help to determine likely locations. Goggle earth can be helpful to pin point the outflows.
Outflows generally are down stream of nearby water treatment plant intakes.
If it's going to rain, don't drain.
Be wary of snow melt offs as well...