41. Free flowing rivers and streams which flow over a Dam structure are the most common types of dams that can provide tailrace fishing. 42. The tailrace is essentially an arm of the Columbia River with no gradient due to the impoundment of the Columbia by Rocky Reach Dam. 43. After passing through the units, water is discharged through the draft tubes to one free surface and one full-flow tailrace tunnel. 44. The water power engine usually had a headrace and a tailrace ( " Aufschlagr�sche " and " Abzugsr�sche " ). 45. The HVDC converter stations are located on the west side of the tailrace , connected to the AC switching station by lines over the tailrace. 46. The HVDC converter stations are located on the west side of the tailrace, connected to the AC switching station by lines over the tailrace . 47. The concrete dam includes eight bottom outlets, a spillway and four power intakes and conduits, a stilling basin, headrace and tailrace channels. 48. The water flowed back out again after a short time, the wheel turning perhaps 30 to 45 degrees, into the lower altitude tailrace . 49. Once through the six turbines, the water exits back to the river by means of two tailrace tunnels, one long and the other. 50. The huge ice island drifted steadily closer to shore, only to be thrust back out into the current by the tailrace of a hydroelectric plant.
