used in flood control

--------------------------------------------------
Note added at 8 hrs (2015-07-17 00:12:47 GMT)
--------------------------------------------------

The City of Dallas has continued to make
improvements to the Levee System by
adding pumping stations, gravity sluice ways,
and levees. .

http://dallascityhall.com/departments/trinitywatershedmanage...

ccccccccccc

The Gyula No. I pumping station and gravity sluice was built in 1942. The structure is ... that faces the water, posing a flood control threat.

http://www.impact-project.net/annexii_detailedtechnicalrepor...
ccccccccccccccccccccccccccccc

The completed flood control project was authorized by Section 2 of Public Law. No. ... concrete structure with a gravity sluice, consisting of a flap gate(s) and ...
http://media.swf.usace.army.mil/pubdata/notices/CentralCity/...

cccccccccccccccccc

Much of the Middle Levels was flooded in 1841-2, and this led the ... tried in the Fens, and it was supplemented in 1880 by a more conventional gravity sluice, also ... motors, manufactured by Lawrence Scott, which are controlled automatically, ...
https://en.wikipedia.org/wiki/Middle_Level_Navigations
cccccccccccccccc