Pond Boss Forums INTRO Questions & Observations developing a spring?

Cecil,
I remember reading about a cement tank used in an aquadome to raise fish and the fish were beat up from contact with the, apparently not too smooth, walls of the tank. I guess the same is true in concrete raceways. This weekend I had an excavator in to dig a 40 foot long, 5 foot deep v shaped trench in which I'll build forms for a concrete wall to trap and deliver the spring into a pipe. If the flow is enough I may try tank culture outdoors, other than swimming pools what are some tank construction alternatives? I want to wait through at least 1 summer to see what the average flow is before I put in a tank. If nothing else, I'm succeeding in drying up a large muddy spot and condensing the flow into a manageable narrow stream flowing to my pond. I read the article about Tiger Trout in Pondboss but they're hard to come by. They would be better to grow out in my pond.