41. The abandoned river channel is known as wind gap. 42. In certain locations there are still knickpoints preserved in these drowned river channels and valleys. 43. Heightened discharge caused extensive erosion along river channels that removed about of soil and vegetation. 44. Parallel to the powerhouse, a tailrace tunnel discharges the water to the river channel below. 45. The aerial bomb was discovered by a dredging machine that was deepening the river channel . 46. Bed-material exerts a control on river channel morphology. 47. The corps spends about $ 7 million a year to maintain the river channel for navigation. 48. It is a little raised above flood level and the highest ground borders the river channels . 49. Just north of Wabasha, the Mississippi River channel narrows to form the base of Lake Pepin. 50. Dredges cleared out the river channel downstream.
