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Soft (or ductile) copper tubing can be bent easily to travel around obstacles in the path of the tubing. While the work hardening of the drawing process used to size the tubing makes the copper hard or rigid, it is carefully annealed to make it soft again; it is, therefore, more expensive to produce than non-annealed, rigid copper tubing.
Excluding the 8.5 miles (13.7 km) of narrow valley below the dam, the project manages the drainage of the entire watershed of the Big Blue River, an area of 9,628 square miles (24,940 km 2) [6] that ranges from just north of Manhattan to the Platte River. West shore of Tuttle Creek Lake, north of Manhattan, Kansas