1. Notes

2. External links

A needle dam is a weir designed to maintain the level or flow of a river through the use of thin "needles" of wood. The needles are leaned against a solid frame and are not intended to be water-tight. Individual needles can be added or removed by hand to constrict the flow of the river, forming a sluice.

One early needle dam maintains the level of Lake Lucerne in Lucerne, Switzerland by restricting the flow of the Reuss, several are still in operation on the Meuse, France and others were built in the United States in the 19th century.

The first needle dam in the United States was completed in 1896 on the Big Sandy River, downstream from the city of Louisa, Kentucky.

A similar approach, now known as paddle and rymer weirs, was used since medieval times on the River Thames in England to create flash locks.^[1]

Notes

External links

• [https://www.youtube.com/watch?v=wWRXj0kUPYQ Video and annotation on the Needle Dam at Lucerne on the river Reuss]

• Power-reduction laws
• Power reduction rule
• Power-reduction rule
• Power reduction rules
• Power-reduction rules
• Power-reduction theorem
• Power reduction theorem
• Power-reduction theorems
• Power reduction theorems
• Power--Refractive Surface
• Power reserved
• Power reserve indicator
• Power Ring (comics)
• Power ring (DC Comics)
• Power Rings
• Power Ring (weapon)
• Power (role-playing games)
• Power Rule
• Power rules
• Power run
• POWERS
• Power's
• Power sag
• Powers Airport
• Powers and abilities of Godzilla