About the Book
Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pages: 100. Chapters: Rapid, Tributary, Entrenched river, Distributary, Lock, Whitewater, Braided river, Lotic ecosystem, River engineering, List of whitewater rivers, Riparian zone restoration, Meander, List of drainage basins by area, Wild river, Stream, Blackwater river, Total dissolved solids, Weir, Oxbow lake, Stream restoration, Source, Confluence, Avulsion, Stream capture, Frazil ice, Water-meadow, Subterranean river, River mile, International Rivers, Ice circle, Drainage system, Discharge, Ephemeral, Environmental flow, Revetment, World Commission on Dams, Backwater, Upland and lowland, Urban stream, Rejuvenation, Drainage divide, Spring creek, Channel types, Stream bed, Anabranch, World Rivers Day, Fluvial landforms of streams, Stream gradient, Log jam, Perennial stream, Sinuosity, Ordinary high water mark, Riffle-pool sequence, Winterbourne, Bank, River regime, Glaciolacustrine deposits, River morphology, Baer's law, Rheophile, Flood control channel, Integrated catchment management, List of tidal barrages, Drainage density, Helicoidal flow, Main stem, Hack's law, Flood-meadow, Debouch, Reach, Relief ratio, Main river, Salt tide, River channel migration, Riverine Inputs and Direct Discharges, Current, Crevasse splay, Yazoo stream, Mouth, Shut-in, Tidal river, Stepped profile, Riverscape, Myu River. Excerpt: A lock is a device for raising and lowering boats between stretches of water of different levels on river and canal waterways. The distinguishing feature of a lock is a fixed chamber in which the water level can be varied; whereas in a caisson lock, a boat lift, or on a canal inclined plane, it is the chamber itself (usually then called a caisson) that rises and falls. Locks are used to make a river more easily navigable, or to allow a canal to take a reasonably direct line across land that is not level. A pound lock is a ty...
