| 11. | A new Brazos River channel and the Intracoastal Waterway isolated Quintana.
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| 12. | This stretch of rapids was about long, and the river channel narrowed to.
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| 13. | The river channel is characterized by sand, silt and organic material.
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| 14. | Built along the river channel, the original light was vulnerable to seasonal flooding.
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| 15. | Fish migration between river channels and flood-plain regions occurs seasonally.
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| 16. | Choked by sewage and factory effluents, some river channels here have become virtual cesspools.
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| 17. | After the floodwater receded there was talk of trying to straighten the river channel.
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| 18. | River channels may shift their locations from time to time.
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| 19. | In the nineteenth century, the sandy river channel changed frequently, causing numerous steamboat accidents.
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| 20. | The water is diverted back to the Xacbal river channel.
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