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A pound lock has a chamber with gates at both ends that control the level of water in the pound. In contrast, an earlier design with a single gate was known as a flash lock. [4] Pound locks were first used in China during the Song dynasty (960–1279 CE), having been pioneered by the Song politician and naval engineer Qiao Weiyue in 984. [5]
A short pound on the Chesterfield Canal in England, United Kingdom. A canal pound (from impound), [1] reach, or level (American usage), is the stretch of level water impounded between two canal locks. Canal pounds can vary in length from the non-existent, where two or more immediately adjacent locks form a lock staircase, to many kilometres/miles.
The pound lock holds water between two gates, and is considerably easier to navigate. Pound locks have been built in China since 983, in the Netherlands from 1065 and in Britain from the 1560s. Nevertheless, a few flash locks remained after the introduction of pound locks.
The lock was eventually converted into a waste weir. [9] The Goose Creek lock is a staircase lock or combine lock: [10] two locks with no intervening pound or basin, the upper gate of the lower lock being the same gate as the lower gate of the second lock. It was perhaps the only such lock on the C&O Canal.
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The canal had three locks with vertical gates – the first pound locks to be built in Britain. They accommodated boats up to 16 tonnes. [7] The original cut was 3 feet (0.91 m) deep and 16 feet (4.9 m) wide (0.9 m by 5 m).
You’ll usually pay 0.25% to 1% of your loan amount for a rate lock, depending on the lender. On a $400,000 mortgage loan, that’s the equivalent of paying from $1,000 to $4,000.